/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Copyright (C) 2002 Cluster File Systems, Inc.
+ * GPL HEADER START
*
- * This file is part of Lustre, http://www.lustre.org.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
*
- * Lustre is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
*
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*/
#define DEBUG_SUBSYSTEM S_RPC
#ifndef __KERNEL__
#include <liblustre.h>
-#include <linux/kp30.h>
#endif
-#include <linux/obd_support.h>
-#include <linux/obd_class.h>
-#include <linux/lustre_net.h>
-#include <portals/types.h>
+#include <obd_support.h>
+#include <obd_class.h>
+#include <lustre_net.h>
+#include <lu_object.h>
+#include <lnet/types.h>
#include "ptlrpc_internal.h"
-static LIST_HEAD (ptlrpc_all_services);
-static spinlock_t ptlrpc_all_services_lock = SPIN_LOCK_UNLOCKED;
-
-static void
-ptlrpc_free_server_req (struct ptlrpc_request *req)
-{
- /* The last request to be received into a request buffer uses space
- * in the request buffer descriptor, otherwise requests are
- * allocated dynamically in the incoming reply event handler */
- if (req == &req->rq_rqbd->rqbd_req)
- return;
+/* The following are visible and mutable through /sys/module/ptlrpc */
+int test_req_buffer_pressure = 0;
+CFS_MODULE_PARM(test_req_buffer_pressure, "i", int, 0444,
+ "set non-zero to put pressure on request buffer pools");
+CFS_MODULE_PARM(at_min, "i", int, 0644,
+ "Adaptive timeout minimum (sec)");
+CFS_MODULE_PARM(at_max, "i", int, 0644,
+ "Adaptive timeout maximum (sec)");
+CFS_MODULE_PARM(at_history, "i", int, 0644,
+ "Adaptive timeouts remember the slowest event that took place "
+ "within this period (sec)");
+CFS_MODULE_PARM(at_early_margin, "i", int, 0644,
+ "How soon before an RPC deadline to send an early reply");
+CFS_MODULE_PARM(at_extra, "i", int, 0644,
+ "How much extra time to give with each early reply");
+
+
+/* forward ref */
+static int ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc);
+
+static CFS_LIST_HEAD(ptlrpc_all_services);
+spinlock_t ptlrpc_all_services_lock;
- OBD_FREE(req, sizeof(*req));
-}
-
static char *
ptlrpc_alloc_request_buffer (int size)
{
char *ptr;
-
+
if (size > SVC_BUF_VMALLOC_THRESHOLD)
OBD_VMALLOC(ptr, size);
else
OBD_ALLOC(ptr, size);
-
+
return (ptr);
}
}
struct ptlrpc_request_buffer_desc *
-ptlrpc_alloc_rqbd (struct ptlrpc_srv_ni *srv_ni)
+ptlrpc_alloc_rqbd (struct ptlrpc_service *svc)
{
- struct ptlrpc_service *svc = srv_ni->sni_service;
- unsigned long flags;
struct ptlrpc_request_buffer_desc *rqbd;
- OBD_ALLOC(rqbd, sizeof (*rqbd));
+ OBD_ALLOC_PTR(rqbd);
if (rqbd == NULL)
return (NULL);
- rqbd->rqbd_srv_ni = srv_ni;
+ rqbd->rqbd_service = svc;
rqbd->rqbd_refcount = 0;
rqbd->rqbd_cbid.cbid_fn = request_in_callback;
rqbd->rqbd_cbid.cbid_arg = rqbd;
+ CFS_INIT_LIST_HEAD(&rqbd->rqbd_reqs);
rqbd->rqbd_buffer = ptlrpc_alloc_request_buffer(svc->srv_buf_size);
if (rqbd->rqbd_buffer == NULL) {
- OBD_FREE(rqbd, sizeof (*rqbd));
+ OBD_FREE_PTR(rqbd);
return (NULL);
}
- spin_lock_irqsave (&svc->srv_lock, flags);
+ spin_lock(&svc->srv_lock);
list_add(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
svc->srv_nbufs++;
- spin_unlock_irqrestore (&svc->srv_lock, flags);
+ spin_unlock(&svc->srv_lock);
return (rqbd);
}
void
-ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
+ptlrpc_free_rqbd (struct ptlrpc_request_buffer_desc *rqbd)
{
- struct ptlrpc_srv_ni *sni = rqbd->rqbd_srv_ni;
- struct ptlrpc_service *svc = sni->sni_service;
- unsigned long flags;
-
+ struct ptlrpc_service *svc = rqbd->rqbd_service;
+
LASSERT (rqbd->rqbd_refcount == 0);
+ LASSERT (list_empty(&rqbd->rqbd_reqs));
- spin_lock_irqsave(&svc->srv_lock, flags);
+ spin_lock(&svc->srv_lock);
list_del(&rqbd->rqbd_list);
svc->srv_nbufs--;
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ spin_unlock(&svc->srv_lock);
ptlrpc_free_request_buffer (rqbd->rqbd_buffer, svc->srv_buf_size);
- OBD_FREE (rqbd, sizeof (*rqbd));
+ OBD_FREE_PTR(rqbd);
+}
+
+int
+ptlrpc_grow_req_bufs(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request_buffer_desc *rqbd;
+ int i;
+
+ CDEBUG(D_RPCTRACE, "%s: allocate %d new %d-byte reqbufs (%d/%d left)\n",
+ svc->srv_name, svc->srv_nbuf_per_group, svc->srv_buf_size,
+ svc->srv_nrqbd_receiving, svc->srv_nbufs);
+ for (i = 0; i < svc->srv_nbuf_per_group; i++) {
+ rqbd = ptlrpc_alloc_rqbd(svc);
+
+ if (rqbd == NULL) {
+ CERROR ("%s: Can't allocate request buffer\n",
+ svc->srv_name);
+ return (-ENOMEM);
+ }
+
+ if (ptlrpc_server_post_idle_rqbds(svc) < 0)
+ return (-EAGAIN);
+ }
+
+ return (0);
}
void
-ptlrpc_save_lock (struct ptlrpc_request *req,
- struct lustre_handle *lock, int mode)
+ptlrpc_save_lock(struct ptlrpc_request *req,
+ struct lustre_handle *lock, int mode, int no_ack)
{
struct ptlrpc_reply_state *rs = req->rq_reply_state;
int idx;
- LASSERT (rs != NULL);
- LASSERT (rs->rs_nlocks < RS_MAX_LOCKS);
+ LASSERT(rs != NULL);
+ LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
+
+ if (req->rq_export->exp_disconnected) {
+ ldlm_lock_decref(lock, mode);
+ } else {
+ idx = rs->rs_nlocks++;
+ rs->rs_locks[idx] = *lock;
+ rs->rs_modes[idx] = mode;
+ rs->rs_difficult = 1;
+ rs->rs_no_ack = !!no_ack;
+ }
+}
+
+#ifdef __KERNEL__
+
+#define HRT_RUNNING 0
+#define HRT_STOPPING 1
+
+struct ptlrpc_hr_thread {
+ spinlock_t hrt_lock;
+ unsigned long hrt_flags;
+ cfs_waitq_t hrt_wait;
+ struct list_head hrt_queue;
+ struct completion hrt_completion;
+};
+
+struct ptlrpc_hr_service {
+ int hr_index;
+ int hr_n_threads;
+ int hr_size;
+ struct ptlrpc_hr_thread hr_threads[0];
+};
+
+struct rs_batch {
+ struct list_head rsb_replies;
+ struct ptlrpc_service *rsb_svc;
+ unsigned int rsb_n_replies;
+};
+
+/**
+ * A pointer to per-node reply handling service.
+ */
+static struct ptlrpc_hr_service *ptlrpc_hr = NULL;
+
+/**
+ * maximum mumber of replies scheduled in one batch
+ */
+#define MAX_SCHEDULED 256
- idx = rs->rs_nlocks++;
- rs->rs_locks[idx] = *lock;
- rs->rs_modes[idx] = mode;
- rs->rs_difficult = 1;
+/**
+ * Initialize a reply batch.
+ *
+ * \param b batch
+ */
+static void rs_batch_init(struct rs_batch *b)
+{
+ memset(b, 0, sizeof *b);
+ CFS_INIT_LIST_HEAD(&b->rsb_replies);
+}
+
+/**
+ * Dispatch all replies accumulated in the batch to one from
+ * dedicated reply handling threads.
+ *
+ * \param b batch
+ */
+static void rs_batch_dispatch(struct rs_batch *b)
+{
+ if (b->rsb_n_replies != 0) {
+ struct ptlrpc_hr_service *hr = ptlrpc_hr;
+ int idx;
+
+ idx = hr->hr_index++;
+ if (hr->hr_index >= hr->hr_n_threads)
+ hr->hr_index = 0;
+
+ spin_lock(&hr->hr_threads[idx].hrt_lock);
+ list_splice_init(&b->rsb_replies,
+ &hr->hr_threads[idx].hrt_queue);
+ spin_unlock(&hr->hr_threads[idx].hrt_lock);
+ cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
+ b->rsb_n_replies = 0;
+ }
+}
+
+/**
+ * Add a reply to a batch.
+ * Add one reply object to a batch, schedule batched replies if overload.
+ *
+ * \param b batch
+ * \param rs reply
+ */
+static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
+{
+ struct ptlrpc_service *svc = rs->rs_service;
+
+ if (svc != b->rsb_svc || b->rsb_n_replies >= MAX_SCHEDULED) {
+ if (b->rsb_svc != NULL) {
+ rs_batch_dispatch(b);
+ spin_unlock(&b->rsb_svc->srv_lock);
+ }
+ spin_lock(&svc->srv_lock);
+ b->rsb_svc = svc;
+ }
+ spin_lock(&rs->rs_lock);
+ rs->rs_scheduled_ever = 1;
+ if (rs->rs_scheduled == 0) {
+ list_move(&rs->rs_list, &b->rsb_replies);
+ rs->rs_scheduled = 1;
+ b->rsb_n_replies++;
+ }
+ rs->rs_committed = 1;
+ spin_unlock(&rs->rs_lock);
+}
+
+/**
+ * Reply batch finalization.
+ * Dispatch remaining replies from the batch
+ * and release remaining spinlock.
+ *
+ * \param b batch
+ */
+static void rs_batch_fini(struct rs_batch *b)
+{
+ if (b->rsb_svc != 0) {
+ rs_batch_dispatch(b);
+ spin_unlock(&b->rsb_svc->srv_lock);
+ }
+}
+
+#define DECLARE_RS_BATCH(b) struct rs_batch b
+
+#else /* __KERNEL__ */
+
+#define rs_batch_init(b) do{}while(0)
+#define rs_batch_fini(b) do{}while(0)
+#define rs_batch_add(b, r) ptlrpc_schedule_difficult_reply(r)
+#define DECLARE_RS_BATCH(b)
+
+#endif /* __KERNEL__ */
+
+void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs)
+{
+#ifdef __KERNEL__
+ struct ptlrpc_hr_service *hr = ptlrpc_hr;
+ int idx;
+ ENTRY;
+
+ LASSERT(list_empty(&rs->rs_list));
+
+ idx = hr->hr_index++;
+ if (hr->hr_index >= hr->hr_n_threads)
+ hr->hr_index = 0;
+ spin_lock(&hr->hr_threads[idx].hrt_lock);
+ list_add_tail(&rs->rs_list, &hr->hr_threads[idx].hrt_queue);
+ spin_unlock(&hr->hr_threads[idx].hrt_lock);
+ cfs_waitq_signal(&hr->hr_threads[idx].hrt_wait);
+ EXIT;
+#else
+ list_add_tail(&rs->rs_list, &rs->rs_service->srv_reply_queue);
+#endif
}
void
ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
{
- struct ptlrpc_service *svc = rs->rs_srv_ni->sni_service;
+ ENTRY;
-#ifdef CONFIG_SMP
- LASSERT (spin_is_locked (&svc->srv_lock));
-#endif
+ LASSERT_SPIN_LOCKED(&rs->rs_service->srv_lock);
+ LASSERT_SPIN_LOCKED(&rs->rs_lock);
LASSERT (rs->rs_difficult);
rs->rs_scheduled_ever = 1; /* flag any notification attempt */
- if (rs->rs_scheduled) /* being set up or already notified */
+ if (rs->rs_scheduled) { /* being set up or already notified */
+ EXIT;
return;
+ }
rs->rs_scheduled = 1;
- list_del (&rs->rs_list);
- list_add (&rs->rs_list, &svc->srv_reply_queue);
- wake_up (&svc->srv_waitq);
+ list_del_init(&rs->rs_list);
+ ptlrpc_dispatch_difficult_reply(rs);
+ EXIT;
}
-void
-ptlrpc_commit_replies (struct obd_device *obd)
+void ptlrpc_commit_replies(struct obd_export *exp)
{
- struct list_head *tmp;
- struct list_head *nxt;
- unsigned long flags;
-
+ struct ptlrpc_reply_state *rs, *nxt;
+ DECLARE_RS_BATCH(batch);
+ ENTRY;
+
+ rs_batch_init(&batch);
/* Find any replies that have been committed and get their service
* to attend to complete them. */
/* CAVEAT EMPTOR: spinlock ordering!!! */
- spin_lock_irqsave (&obd->obd_uncommitted_replies_lock, flags);
-
- list_for_each_safe (tmp, nxt, &obd->obd_uncommitted_replies) {
- struct ptlrpc_reply_state *rs =
- list_entry (tmp, struct ptlrpc_reply_state, rs_obd_list);
-
+ spin_lock(&exp->exp_uncommitted_replies_lock);
+ list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
+ rs_obd_list) {
LASSERT (rs->rs_difficult);
-
- if (rs->rs_transno <= obd->obd_last_committed) {
- struct ptlrpc_service *svc = rs->rs_srv_ni->sni_service;
-
- spin_lock (&svc->srv_lock);
- list_del_init (&rs->rs_obd_list);
- ptlrpc_schedule_difficult_reply (rs);
- spin_unlock (&svc->srv_lock);
+ /* VBR: per-export last_committed */
+ LASSERT(rs->rs_export);
+ if (rs->rs_transno <= exp->exp_last_committed) {
+ list_del_init(&rs->rs_obd_list);
+ rs_batch_add(&batch, rs);
}
}
-
- spin_unlock_irqrestore (&obd->obd_uncommitted_replies_lock, flags);
-}
-
-static long
-timeval_sub(struct timeval *large, struct timeval *small)
-{
- return (large->tv_sec - small->tv_sec) * 1000000 +
- (large->tv_usec - small->tv_usec);
+ spin_unlock(&exp->exp_uncommitted_replies_lock);
+ rs_batch_fini(&batch);
+ EXIT;
}
static int
ptlrpc_server_post_idle_rqbds (struct ptlrpc_service *svc)
{
- struct ptlrpc_srv_ni *srv_ni;
struct ptlrpc_request_buffer_desc *rqbd;
- unsigned long flags;
int rc;
+ int posted = 0;
- spin_lock_irqsave(&svc->srv_lock, flags);
- if (list_empty (&svc->srv_idle_rqbds)) {
- spin_unlock_irqrestore(&svc->srv_lock, flags);
- return (0);
- }
+ for (;;) {
+ spin_lock(&svc->srv_lock);
+
+ if (list_empty (&svc->srv_idle_rqbds)) {
+ spin_unlock(&svc->srv_lock);
+ return (posted);
+ }
- rqbd = list_entry(svc->srv_idle_rqbds.next,
- struct ptlrpc_request_buffer_desc,
- rqbd_list);
- list_del (&rqbd->rqbd_list);
+ rqbd = list_entry(svc->srv_idle_rqbds.next,
+ struct ptlrpc_request_buffer_desc,
+ rqbd_list);
+ list_del (&rqbd->rqbd_list);
- /* assume we will post successfully */
- srv_ni = rqbd->rqbd_srv_ni;
- srv_ni->sni_nrqbd_receiving++;
- list_add (&rqbd->rqbd_list, &srv_ni->sni_active_rqbds);
+ /* assume we will post successfully */
+ svc->srv_nrqbd_receiving++;
+ list_add (&rqbd->rqbd_list, &svc->srv_active_rqbds);
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ spin_unlock(&svc->srv_lock);
- rc = ptlrpc_register_rqbd(rqbd);
- if (rc == 0)
- return (1);
+ rc = ptlrpc_register_rqbd(rqbd);
+ if (rc != 0)
+ break;
- spin_lock_irqsave(&svc->srv_lock, flags);
+ posted = 1;
+ }
- srv_ni->sni_nrqbd_receiving--;
+ spin_lock(&svc->srv_lock);
+
+ svc->srv_nrqbd_receiving--;
list_del(&rqbd->rqbd_list);
list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
- if (srv_ni->sni_nrqbd_receiving == 0) {
- /* This service is off-air on this interface because all
- * its request buffers are busy. Portals will have started
- * dropping incoming requests until more buffers get
- * posted */
- CERROR("All %s %s request buffers busy\n",
- svc->srv_name, srv_ni->sni_ni->pni_name);
- }
+ /* Don't complain if no request buffers are posted right now; LNET
+ * won't drop requests because we set the portal lazy! */
- spin_unlock_irqrestore (&svc->srv_lock, flags);
+ spin_unlock(&svc->srv_lock);
return (-1);
}
+struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c,
+ svc_handler_t h, char *name,
+ struct proc_dir_entry *proc_entry,
+ svcreq_printfn_t prntfn,
+ char *threadname)
+{
+ return ptlrpc_init_svc(c->psc_nbufs, c->psc_bufsize,
+ c->psc_max_req_size, c->psc_max_reply_size,
+ c->psc_req_portal, c->psc_rep_portal,
+ c->psc_watchdog_factor,
+ h, name, proc_entry,
+ prntfn, c->psc_min_threads, c->psc_max_threads,
+ threadname, c->psc_ctx_tags, NULL);
+}
+EXPORT_SYMBOL(ptlrpc_init_svc_conf);
+
+static void ptlrpc_at_timer(unsigned long castmeharder)
+{
+ struct ptlrpc_service *svc = (struct ptlrpc_service *)castmeharder;
+ svc->srv_at_check = 1;
+ svc->srv_at_checktime = cfs_time_current();
+ cfs_waitq_signal(&svc->srv_waitq);
+}
+
+/* @threadname should be 11 characters or less - 3 will be added on */
struct ptlrpc_service *
-ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size,
- int req_portal, int rep_portal,
+ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size, int max_reply_size,
+ int req_portal, int rep_portal, int watchdog_factor,
svc_handler_t handler, char *name,
- struct proc_dir_entry *proc_entry)
+ cfs_proc_dir_entry_t *proc_entry,
+ svcreq_printfn_t svcreq_printfn,
+ int min_threads, int max_threads,
+ char *threadname, __u32 ctx_tags,
+ svc_hpreq_handler_t hp_handler)
{
- int i;
- int j;
- int ssize;
- struct ptlrpc_service *service;
- struct ptlrpc_srv_ni *srv_ni;
- struct ptlrpc_request_buffer_desc *rqbd;
+ int rc;
+ struct ptlrpc_at_array *array;
+ struct ptlrpc_service *service;
+ unsigned int size, index;
ENTRY;
- LASSERT (ptlrpc_ninterfaces > 0);
LASSERT (nbufs > 0);
- LASSERT (bufsize >= max_req_size);
-
- ssize = offsetof (struct ptlrpc_service,
- srv_interfaces[ptlrpc_ninterfaces]);
- OBD_ALLOC(service, ssize);
+ LASSERT (bufsize >= max_req_size + SPTLRPC_MAX_PAYLOAD);
+ LASSERT (ctx_tags != 0);
+
+ OBD_ALLOC_PTR(service);
if (service == NULL)
RETURN(NULL);
+ /* First initialise enough for early teardown */
+
service->srv_name = name;
spin_lock_init(&service->srv_lock);
- INIT_LIST_HEAD(&service->srv_threads);
- init_waitqueue_head(&service->srv_waitq);
+ CFS_INIT_LIST_HEAD(&service->srv_threads);
+ cfs_waitq_init(&service->srv_waitq);
- service->srv_max_req_size = max_req_size;
+ service->srv_nbuf_per_group = test_req_buffer_pressure ? 1 : nbufs;
+ service->srv_max_req_size = max_req_size + SPTLRPC_MAX_PAYLOAD;
service->srv_buf_size = bufsize;
service->srv_rep_portal = rep_portal;
service->srv_req_portal = req_portal;
+ service->srv_watchdog_factor = watchdog_factor;
service->srv_handler = handler;
+ service->srv_request_history_print_fn = svcreq_printfn;
+ service->srv_request_seq = 1; /* valid seq #s start at 1 */
+ service->srv_request_max_cull_seq = 0;
+ service->srv_threads_min = min_threads;
+ service->srv_threads_max = max_threads;
+ service->srv_thread_name = threadname;
+ service->srv_ctx_tags = ctx_tags;
+ service->srv_hpreq_handler = hp_handler;
+ service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO;
+ service->srv_hpreq_count = 0;
+ service->srv_n_hpreq = 0;
+
+ rc = LNetSetLazyPortal(service->srv_req_portal);
+ LASSERT (rc == 0);
+
+ CFS_INIT_LIST_HEAD(&service->srv_request_queue);
+ CFS_INIT_LIST_HEAD(&service->srv_request_hpq);
+ CFS_INIT_LIST_HEAD(&service->srv_idle_rqbds);
+ CFS_INIT_LIST_HEAD(&service->srv_active_rqbds);
+ CFS_INIT_LIST_HEAD(&service->srv_history_rqbds);
+ CFS_INIT_LIST_HEAD(&service->srv_request_history);
+ CFS_INIT_LIST_HEAD(&service->srv_active_replies);
+#ifndef __KERNEL__
+ CFS_INIT_LIST_HEAD(&service->srv_reply_queue);
+#endif
+ CFS_INIT_LIST_HEAD(&service->srv_free_rs_list);
+ cfs_waitq_init(&service->srv_free_rs_waitq);
+ atomic_set(&service->srv_n_difficult_replies, 0);
- INIT_LIST_HEAD(&service->srv_request_queue);
- INIT_LIST_HEAD(&service->srv_idle_rqbds);
- INIT_LIST_HEAD(&service->srv_reply_queue);
+ spin_lock_init(&service->srv_at_lock);
+ CFS_INIT_LIST_HEAD(&service->srv_req_in_queue);
- /* First initialise enough for early teardown */
- for (i = 0; i < ptlrpc_ninterfaces; i++) {
- srv_ni = &service->srv_interfaces[i];
+ array = &service->srv_at_array;
+ size = at_est2timeout(at_max);
+ array->paa_size = size;
+ array->paa_count = 0;
+ array->paa_deadline = -1;
- srv_ni->sni_service = service;
- srv_ni->sni_ni = &ptlrpc_interfaces[i];
- INIT_LIST_HEAD(&srv_ni->sni_active_rqbds);
- INIT_LIST_HEAD(&srv_ni->sni_active_replies);
- }
+ /* allocate memory for srv_at_array (ptlrpc_at_array) */
+ OBD_ALLOC(array->paa_reqs_array, sizeof(struct list_head) * size);
+ if (array->paa_reqs_array == NULL)
+ GOTO(failed, NULL);
+
+ for (index = 0; index < size; index++)
+ CFS_INIT_LIST_HEAD(&array->paa_reqs_array[index]);
+
+ OBD_ALLOC(array->paa_reqs_count, sizeof(__u32) * size);
+ if (array->paa_reqs_count == NULL)
+ GOTO(failed, NULL);
+
+ cfs_timer_init(&service->srv_at_timer, ptlrpc_at_timer, service);
+ /* At SOW, service time should be quick; 10s seems generous. If client
+ timeout is less than this, we'll be sending an early reply. */
+ at_init(&service->srv_at_estimate, 10, 0);
spin_lock (&ptlrpc_all_services_lock);
list_add (&service->srv_list, &ptlrpc_all_services);
spin_unlock (&ptlrpc_all_services_lock);
-
- /* Now allocate the request buffers, assuming all interfaces require
- * the same number. */
- for (i = 0; i < ptlrpc_ninterfaces; i++) {
- srv_ni = &service->srv_interfaces[i];
- CDEBUG (D_NET, "%s: initialising interface %s\n", name,
- srv_ni->sni_ni->pni_name);
-
- for (j = 0; j < nbufs; j++) {
- rqbd = ptlrpc_alloc_rqbd (srv_ni);
-
- if (rqbd == NULL) {
- CERROR ("%s.%d: Can't allocate request %d "
- "on %s\n", name, i, j,
- srv_ni->sni_ni->pni_name);
- GOTO(failed, NULL);
- }
- /* We shouldn't be under memory pressure at
- * startup, so fail if we can't post all our
- * buffers at this time. */
- if (ptlrpc_server_post_idle_rqbds(service) <= 0)
- GOTO(failed, NULL);
- }
- }
+ /* Now allocate the request buffers */
+ rc = ptlrpc_grow_req_bufs(service);
+ /* We shouldn't be under memory pressure at startup, so
+ * fail if we can't post all our buffers at this time. */
+ if (rc != 0)
+ GOTO(failed, NULL);
+
+ /* Now allocate pool of reply buffers */
+ /* Increase max reply size to next power of two */
+ service->srv_max_reply_size = 1;
+ while (service->srv_max_reply_size <
+ max_reply_size + SPTLRPC_MAX_PAYLOAD)
+ service->srv_max_reply_size <<= 1;
if (proc_entry != NULL)
ptlrpc_lprocfs_register_service(proc_entry, service);
- CDEBUG(D_NET, "%s: Started on %d interfaces, listening on portal %d\n",
- service->srv_name, ptlrpc_ninterfaces, service->srv_req_portal);
+ CDEBUG(D_NET, "%s: Started, listening on portal %d\n",
+ service->srv_name, service->srv_req_portal);
RETURN(service);
failed:
return NULL;
}
-static void
-ptlrpc_server_free_request(struct ptlrpc_service *svc, struct ptlrpc_request *req)
+/**
+ * to actually free the request, must be called without holding svc_lock.
+ * note it's caller's responsibility to unlink req->rq_list.
+ */
+static void ptlrpc_server_free_request(struct ptlrpc_request *req)
{
- unsigned long flags;
- int refcount;
-
- spin_lock_irqsave(&svc->srv_lock, flags);
+ LASSERT(atomic_read(&req->rq_refcount) == 0);
+ LASSERT(list_empty(&req->rq_timed_list));
+
+ /* DEBUG_REQ() assumes the reply state of a request with a valid
+ * ref will not be destroyed until that reference is dropped. */
+ ptlrpc_req_drop_rs(req);
+
+ sptlrpc_svc_ctx_decref(req);
+
+ if (req != &req->rq_rqbd->rqbd_req) {
+ /* NB request buffers use an embedded
+ * req if the incoming req unlinked the
+ * MD; this isn't one of them! */
+ OBD_FREE(req, sizeof(*req));
+ }
+}
+
+/**
+ * drop a reference count of the request. if it reaches 0, we either
+ * put it into history list, or free it immediately.
+ */
+void ptlrpc_server_drop_request(struct ptlrpc_request *req)
+{
+ struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
+ struct ptlrpc_service *svc = rqbd->rqbd_service;
+ int refcount;
+ struct list_head *tmp;
+ struct list_head *nxt;
+
+ if (!atomic_dec_and_test(&req->rq_refcount))
+ return;
+
+ spin_lock(&svc->srv_at_lock);
+ if (req->rq_at_linked) {
+ struct ptlrpc_at_array *array = &svc->srv_at_array;
+ __u32 index = req->rq_at_index;
+
+ LASSERT(!list_empty(&req->rq_timed_list));
+ list_del_init(&req->rq_timed_list);
+ req->rq_at_linked = 0;
+ array->paa_reqs_count[index]--;
+ array->paa_count--;
+ } else
+ LASSERT(list_empty(&req->rq_timed_list));
+ spin_unlock(&svc->srv_at_lock);
+
+ /* finalize request */
+ if (req->rq_export) {
+ class_export_put(req->rq_export);
+ req->rq_export = NULL;
+ }
+
+ spin_lock(&svc->srv_lock);
+
svc->srv_n_active_reqs--;
- refcount = --(req->rq_rqbd->rqbd_refcount);
+ list_add(&req->rq_list, &rqbd->rqbd_reqs);
+
+ refcount = --(rqbd->rqbd_refcount);
if (refcount == 0) {
- /* request buffer is now idle */
- list_del(&req->rq_rqbd->rqbd_list);
- list_add_tail(&req->rq_rqbd->rqbd_list,
- &svc->srv_idle_rqbds);
+ /* request buffer is now idle: add to history */
+ list_del(&rqbd->rqbd_list);
+ list_add_tail(&rqbd->rqbd_list, &svc->srv_history_rqbds);
+ svc->srv_n_history_rqbds++;
+
+ /* cull some history?
+ * I expect only about 1 or 2 rqbds need to be recycled here */
+ while (svc->srv_n_history_rqbds > svc->srv_max_history_rqbds) {
+ rqbd = list_entry(svc->srv_history_rqbds.next,
+ struct ptlrpc_request_buffer_desc,
+ rqbd_list);
+
+ list_del(&rqbd->rqbd_list);
+ svc->srv_n_history_rqbds--;
+
+ /* remove rqbd's reqs from svc's req history while
+ * I've got the service lock */
+ list_for_each(tmp, &rqbd->rqbd_reqs) {
+ req = list_entry(tmp, struct ptlrpc_request,
+ rq_list);
+ /* Track the highest culled req seq */
+ if (req->rq_history_seq >
+ svc->srv_request_max_cull_seq)
+ svc->srv_request_max_cull_seq =
+ req->rq_history_seq;
+ list_del(&req->rq_history_list);
+ }
+
+ spin_unlock(&svc->srv_lock);
+
+ list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
+ req = list_entry(rqbd->rqbd_reqs.next,
+ struct ptlrpc_request,
+ rq_list);
+ list_del(&req->rq_list);
+ ptlrpc_server_free_request(req);
+ }
+
+ spin_lock(&svc->srv_lock);
+ /*
+ * now all reqs including the embedded req has been
+ * disposed, schedule request buffer for re-use.
+ */
+ LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == 0);
+ list_add_tail(&rqbd->rqbd_list, &svc->srv_idle_rqbds);
+ }
+
+ spin_unlock(&svc->srv_lock);
+ } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) {
+ /* If we are low on memory, we are not interested in history */
+ list_del(&req->rq_list);
+ list_del_init(&req->rq_history_list);
+ spin_unlock(&svc->srv_lock);
+
+ ptlrpc_server_free_request(req);
+ } else {
+ spin_unlock(&svc->srv_lock);
}
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+}
- ptlrpc_free_server_req(req);
+/**
+ * to finish a request: stop sending more early replies, and release
+ * the request. should be called after we finished handling the request.
+ */
+static void ptlrpc_server_finish_request(struct ptlrpc_request *req)
+{
+ ptlrpc_server_drop_request(req);
}
-static int
-ptlrpc_server_handle_request (struct ptlrpc_service *svc)
+/* This function makes sure dead exports are evicted in a timely manner.
+ This function is only called when some export receives a message (i.e.,
+ the network is up.) */
+static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
{
+ struct obd_export *oldest_exp;
+ time_t oldest_time, new_time;
+
+ ENTRY;
+
+ LASSERT(exp);
+
+ /* Compensate for slow machines, etc, by faking our request time
+ into the future. Although this can break the strict time-ordering
+ of the list, we can be really lazy here - we don't have to evict
+ at the exact right moment. Eventually, all silent exports
+ will make it to the top of the list. */
+
+ /* Do not pay attention on 1sec or smaller renewals. */
+ new_time = cfs_time_current_sec() + extra_delay;
+ if (exp->exp_last_request_time + 1 /*second */ >= new_time)
+ RETURN_EXIT;
+
+ exp->exp_last_request_time = new_time;
+ CDEBUG(D_HA, "updating export %s at "CFS_TIME_T" exp %p\n",
+ exp->exp_client_uuid.uuid,
+ exp->exp_last_request_time, exp);
+
+ /* exports may get disconnected from the chain even though the
+ export has references, so we must keep the spin lock while
+ manipulating the lists */
+ spin_lock(&exp->exp_obd->obd_dev_lock);
+
+ if (list_empty(&exp->exp_obd_chain_timed)) {
+ /* this one is not timed */
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+ RETURN_EXIT;
+ }
+
+ list_move_tail(&exp->exp_obd_chain_timed,
+ &exp->exp_obd->obd_exports_timed);
+
+ oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
+ struct obd_export, exp_obd_chain_timed);
+ oldest_time = oldest_exp->exp_last_request_time;
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+
+ if (exp->exp_obd->obd_recovering) {
+ /* be nice to everyone during recovery */
+ EXIT;
+ return;
+ }
+
+ /* Note - racing to start/reset the obd_eviction timer is safe */
+ if (exp->exp_obd->obd_eviction_timer == 0) {
+ /* Check if the oldest entry is expired. */
+ if (cfs_time_current_sec() > (oldest_time + PING_EVICT_TIMEOUT +
+ extra_delay)) {
+ /* We need a second timer, in case the net was down and
+ * it just came back. Since the pinger may skip every
+ * other PING_INTERVAL (see note in ptlrpc_pinger_main),
+ * we better wait for 3. */
+ exp->exp_obd->obd_eviction_timer =
+ cfs_time_current_sec() + 3 * PING_INTERVAL;
+ CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
+ exp->exp_obd->obd_name,
+ obd_export_nid2str(oldest_exp), oldest_time);
+ }
+ } else {
+ if (cfs_time_current_sec() >
+ (exp->exp_obd->obd_eviction_timer + extra_delay)) {
+ /* The evictor won't evict anyone who we've heard from
+ * recently, so we don't have to check before we start
+ * it. */
+ if (!ping_evictor_wake(exp))
+ exp->exp_obd->obd_eviction_timer = 0;
+ }
+ }
+
+ EXIT;
+}
+
+static int ptlrpc_check_req(struct ptlrpc_request *req)
+{
+ if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) <
+ req->rq_export->exp_conn_cnt)) {
+ DEBUG_REQ(D_ERROR, req,
+ "DROPPING req from old connection %d < %d",
+ lustre_msg_get_conn_cnt(req->rq_reqmsg),
+ req->rq_export->exp_conn_cnt);
+ return -EEXIST;
+ }
+ if (unlikely(req->rq_export->exp_obd &&
+ req->rq_export->exp_obd->obd_fail)) {
+ /* Failing over, don't handle any more reqs, send
+ error response instead. */
+ CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n",
+ req, req->rq_export->exp_obd->obd_name);
+ req->rq_status = -ENODEV;
+ ptlrpc_error(req);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void ptlrpc_at_set_timer(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_at_array *array = &svc->srv_at_array;
+ __s32 next;
+
+ spin_lock(&svc->srv_at_lock);
+ if (array->paa_count == 0) {
+ cfs_timer_disarm(&svc->srv_at_timer);
+ spin_unlock(&svc->srv_at_lock);
+ return;
+ }
+
+ /* Set timer for closest deadline */
+ next = (__s32)(array->paa_deadline - cfs_time_current_sec() -
+ at_early_margin);
+ if (next <= 0)
+ ptlrpc_at_timer((unsigned long)svc);
+ else
+ cfs_timer_arm(&svc->srv_at_timer, cfs_time_shift(next));
+ spin_unlock(&svc->srv_at_lock);
+ CDEBUG(D_INFO, "armed %s at %+ds\n", svc->srv_name, next);
+}
+
+/* Add rpc to early reply check list */
+static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
+{
+ struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
+ struct ptlrpc_request *rq = NULL;
+ struct ptlrpc_at_array *array = &svc->srv_at_array;
+ __u32 index;
+ int found = 0;
+
+ if (AT_OFF)
+ return(0);
+
+ if (req->rq_no_reply)
+ return 0;
+
+ if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0)
+ return(-ENOSYS);
+
+ spin_lock(&svc->srv_at_lock);
+ LASSERT(list_empty(&req->rq_timed_list));
+
+ index = (unsigned long)req->rq_deadline % array->paa_size;
+ if (array->paa_reqs_count[index] > 0) {
+ /* latest rpcs will have the latest deadlines in the list,
+ * so search backward. */
+ list_for_each_entry_reverse(rq, &array->paa_reqs_array[index],
+ rq_timed_list) {
+ if (req->rq_deadline >= rq->rq_deadline) {
+ list_add(&req->rq_timed_list,
+ &rq->rq_timed_list);
+ break;
+ }
+ }
+ }
+
+ /* Add the request at the head of the list */
+ if (list_empty(&req->rq_timed_list))
+ list_add(&req->rq_timed_list, &array->paa_reqs_array[index]);
+
+ req->rq_at_linked = 1;
+ req->rq_at_index = index;
+ array->paa_reqs_count[index]++;
+ array->paa_count++;
+ if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) {
+ array->paa_deadline = req->rq_deadline;
+ found = 1;
+ }
+ spin_unlock(&svc->srv_at_lock);
+
+ if (found)
+ ptlrpc_at_set_timer(svc);
+
+ return 0;
+}
+
+static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
+{
+ struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
+ struct ptlrpc_request *reqcopy;
+ struct lustre_msg *reqmsg;
+ cfs_duration_t olddl = req->rq_deadline - cfs_time_current_sec();
+ time_t newdl;
+ int rc;
+ ENTRY;
+
+ /* deadline is when the client expects us to reply, margin is the
+ difference between clients' and servers' expectations */
+ DEBUG_REQ(D_ADAPTTO, req,
+ "%ssending early reply (deadline %+lds, margin %+lds) for "
+ "%d+%d", AT_OFF ? "AT off - not " : "",
+ olddl, olddl - at_get(&svc->srv_at_estimate),
+ at_get(&svc->srv_at_estimate), at_extra);
+
+ if (AT_OFF)
+ RETURN(0);
+
+ if (olddl < 0) {
+ DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), "
+ "not sending early reply. Consider increasing "
+ "at_early_margin (%d)?", olddl, at_early_margin);
+
+ /* Return an error so we're not re-added to the timed list. */
+ RETURN(-ETIMEDOUT);
+ }
+
+ if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0){
+ DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, "
+ "but no AT support");
+ RETURN(-ENOSYS);
+ }
+
+ if (req->rq_export &&
+ lustre_msg_get_flags(req->rq_reqmsg) &
+ (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
+ /**
+ * Use at_extra as early reply period for recovery requests but
+ * make sure it is not bigger than recovery time / 4
+ */
+ at_add(&svc->srv_at_estimate,
+ min(at_extra,
+ req->rq_export->exp_obd->obd_recovery_timeout / 4));
+ } else {
+ /* Fake our processing time into the future to ask the clients
+ * for some extra amount of time */
+ at_add(&svc->srv_at_estimate, at_extra);
+ }
+
+ newdl = cfs_time_current_sec() + at_get(&svc->srv_at_estimate);
+ if (req->rq_deadline >= newdl) {
+ /* We're not adding any time, no need to send an early reply
+ (e.g. maybe at adaptive_max) */
+ DEBUG_REQ(D_WARNING, req, "Couldn't add any time ("
+ CFS_DURATION_T"/"CFS_DURATION_T"), "
+ "not sending early reply\n", olddl,
+ cfs_time_sub(newdl, cfs_time_current_sec()));
+ RETURN(-ETIMEDOUT);
+ }
+
+ OBD_ALLOC(reqcopy, sizeof *reqcopy);
+ if (reqcopy == NULL)
+ RETURN(-ENOMEM);
+ OBD_ALLOC(reqmsg, req->rq_reqlen);
+ if (!reqmsg) {
+ OBD_FREE(reqcopy, sizeof *reqcopy);
+ RETURN(-ENOMEM);
+ }
+
+ *reqcopy = *req;
+ reqcopy->rq_reply_state = NULL;
+ reqcopy->rq_rep_swab_mask = 0;
+ reqcopy->rq_pack_bulk = 0;
+ reqcopy->rq_pack_udesc = 0;
+ reqcopy->rq_packed_final = 0;
+ sptlrpc_svc_ctx_addref(reqcopy);
+ /* We only need the reqmsg for the magic */
+ reqcopy->rq_reqmsg = reqmsg;
+ memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
+
+ LASSERT(atomic_read(&req->rq_refcount));
+ /** if it is last refcount then early reply isn't needed */
+ if (atomic_read(&req->rq_refcount) == 1) {
+ DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, "
+ "abort sending early reply\n");
+ GOTO(out, rc = -EINVAL);
+ }
+
+ /* Connection ref */
+ reqcopy->rq_export = class_conn2export(
+ lustre_msg_get_handle(reqcopy->rq_reqmsg));
+ if (reqcopy->rq_export == NULL)
+ GOTO(out, rc = -ENODEV);
+
+ /* RPC ref */
+ class_export_rpc_get(reqcopy->rq_export);
+ if (reqcopy->rq_export->exp_obd &&
+ reqcopy->rq_export->exp_obd->obd_fail)
+ GOTO(out_put, rc = -ENODEV);
+
+ rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY);
+ if (rc)
+ GOTO(out_put, rc);
+
+ rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY);
+
+ if (!rc) {
+ /* Adjust our own deadline to what we told the client */
+ req->rq_deadline = newdl;
+ req->rq_early_count++; /* number sent, server side */
+ } else {
+ DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc);
+ }
+
+ /* Free the (early) reply state from lustre_pack_reply.
+ (ptlrpc_send_reply takes it's own rs ref, so this is safe here) */
+ ptlrpc_req_drop_rs(reqcopy);
+
+out_put:
+ class_export_rpc_put(reqcopy->rq_export);
+ class_export_put(reqcopy->rq_export);
+out:
+ sptlrpc_svc_ctx_decref(reqcopy);
+ OBD_FREE(reqmsg, req->rq_reqlen);
+ OBD_FREE(reqcopy, sizeof *reqcopy);
+ RETURN(rc);
+}
+
+/* Send early replies to everybody expiring within at_early_margin
+ asking for at_extra time */
+static int ptlrpc_at_check_timed(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request *rq, *n;
+ struct list_head work_list;
+ struct ptlrpc_at_array *array = &svc->srv_at_array;
+ __u32 index, count;
+ time_t deadline;
+ time_t now = cfs_time_current_sec();
+ cfs_duration_t delay;
+ int first, counter = 0;
+ ENTRY;
+
+ spin_lock(&svc->srv_at_lock);
+ if (svc->srv_at_check == 0) {
+ spin_unlock(&svc->srv_at_lock);
+ RETURN(0);
+ }
+ delay = cfs_time_sub(cfs_time_current(), svc->srv_at_checktime);
+ svc->srv_at_check = 0;
+
+ if (array->paa_count == 0) {
+ spin_unlock(&svc->srv_at_lock);
+ RETURN(0);
+ }
+
+ /* The timer went off, but maybe the nearest rpc already completed. */
+ first = array->paa_deadline - now;
+ if (first > at_early_margin) {
+ /* We've still got plenty of time. Reset the timer. */
+ spin_unlock(&svc->srv_at_lock);
+ ptlrpc_at_set_timer(svc);
+ RETURN(0);
+ }
+
+ /* We're close to a timeout, and we don't know how much longer the
+ server will take. Send early replies to everyone expiring soon. */
+ CFS_INIT_LIST_HEAD(&work_list);
+ deadline = -1;
+ index = (unsigned long)array->paa_deadline % array->paa_size;
+ count = array->paa_count;
+ while (count > 0) {
+ count -= array->paa_reqs_count[index];
+ list_for_each_entry_safe(rq, n, &array->paa_reqs_array[index],
+ rq_timed_list) {
+ if (rq->rq_deadline <= now + at_early_margin) {
+ list_del_init(&rq->rq_timed_list);
+ /**
+ * ptlrpc_server_drop_request() may drop
+ * refcount to 0 already. Let's check this and
+ * don't add entry to work_list
+ */
+ if (likely(atomic_inc_not_zero(&rq->rq_refcount)))
+ list_add(&rq->rq_timed_list, &work_list);
+ counter++;
+ array->paa_reqs_count[index]--;
+ array->paa_count--;
+ rq->rq_at_linked = 0;
+ continue;
+ }
+
+ /* update the earliest deadline */
+ if (deadline == -1 || rq->rq_deadline < deadline)
+ deadline = rq->rq_deadline;
+
+ break;
+ }
+
+ if (++index >= array->paa_size)
+ index = 0;
+ }
+ array->paa_deadline = deadline;
+ spin_unlock(&svc->srv_at_lock);
+
+ /* we have a new earliest deadline, restart the timer */
+ ptlrpc_at_set_timer(svc);
+
+ CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early "
+ "replies\n", first, at_extra, counter);
+ if (first < 0) {
+ /* We're already past request deadlines before we even get a
+ chance to send early replies */
+ LCONSOLE_WARN("%s: This server is not able to keep up with "
+ "request traffic (cpu-bound).\n", svc->srv_name);
+ CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, "
+ "delay="CFS_DURATION_T"(jiff)\n",
+ counter, svc->srv_n_queued_reqs, svc->srv_n_active_reqs,
+ at_get(&svc->srv_at_estimate), delay);
+ }
+
+ /* we took additional refcount so entries can't be deleted from list, no
+ * locking is needed */
+ while (!list_empty(&work_list)) {
+ rq = list_entry(work_list.next, struct ptlrpc_request,
+ rq_timed_list);
+ list_del_init(&rq->rq_timed_list);
+
+ if (ptlrpc_at_send_early_reply(rq) == 0)
+ ptlrpc_at_add_timed(rq);
+
+ ptlrpc_server_drop_request(rq);
+ }
+
+ RETURN(0);
+}
+
+/**
+ * Put the request to the export list if the request may become
+ * a high priority one.
+ */
+static int ptlrpc_hpreq_init(struct ptlrpc_service *svc,
+ struct ptlrpc_request *req)
+{
+ int rc;
+ ENTRY;
+
+ if (svc->srv_hpreq_handler) {
+ rc = svc->srv_hpreq_handler(req);
+ if (rc)
+ RETURN(rc);
+ }
+ if (req->rq_export && req->rq_ops) {
+ spin_lock(&req->rq_export->exp_lock);
+ list_add(&req->rq_exp_list, &req->rq_export->exp_queued_rpc);
+ spin_unlock(&req->rq_export->exp_lock);
+ }
+
+ RETURN(0);
+}
+
+/** Remove the request from the export list. */
+static void ptlrpc_hpreq_fini(struct ptlrpc_request *req)
+{
+ ENTRY;
+ if (req->rq_export && req->rq_ops) {
+ spin_lock(&req->rq_export->exp_lock);
+ list_del_init(&req->rq_exp_list);
+ spin_unlock(&req->rq_export->exp_lock);
+ }
+ EXIT;
+}
+
+/**
+ * Make the request a high priority one.
+ *
+ * All the high priority requests are queued in a separate FIFO
+ * ptlrpc_service::srv_request_hpq list which is parallel to
+ * ptlrpc_service::srv_request_queue list but has a higher priority
+ * for handling.
+ *
+ * \see ptlrpc_server_handle_request().
+ */
+static void ptlrpc_hpreq_reorder_nolock(struct ptlrpc_service *svc,
+ struct ptlrpc_request *req)
+{
+ ENTRY;
+ LASSERT(svc != NULL);
+ spin_lock(&req->rq_lock);
+ if (req->rq_hp == 0) {
+ int opc = lustre_msg_get_opc(req->rq_reqmsg);
+
+ /* Add to the high priority queue. */
+ list_move_tail(&req->rq_list, &svc->srv_request_hpq);
+ req->rq_hp = 1;
+ if (opc != OBD_PING)
+ DEBUG_REQ(D_NET, req, "high priority req");
+ }
+ spin_unlock(&req->rq_lock);
+ EXIT;
+}
+
+void ptlrpc_hpreq_reorder(struct ptlrpc_request *req)
+{
+ struct ptlrpc_service *svc = req->rq_rqbd->rqbd_service;
+ ENTRY;
+
+ spin_lock(&svc->srv_lock);
+ /* It may happen that the request is already taken for the processing
+ * but still in the export list, do not re-add it into the HP list. */
+ if (req->rq_phase == RQ_PHASE_NEW)
+ ptlrpc_hpreq_reorder_nolock(svc, req);
+ spin_unlock(&svc->srv_lock);
+ EXIT;
+}
+
+/** Check if the request is a high priority one. */
+static int ptlrpc_server_hpreq_check(struct ptlrpc_request *req)
+{
+ int opc, rc = 0;
+ ENTRY;
+
+ /* Check by request opc. */
+ opc = lustre_msg_get_opc(req->rq_reqmsg);
+ if (opc == OBD_PING)
+ RETURN(1);
+
+ /* Perform request specific check. */
+ if (req->rq_ops && req->rq_ops->hpreq_check)
+ rc = req->rq_ops->hpreq_check(req);
+ RETURN(rc);
+}
+
+/** Check if a request is a high priority one. */
+static int ptlrpc_server_request_add(struct ptlrpc_service *svc,
+ struct ptlrpc_request *req)
+{
+ int rc;
+ ENTRY;
+
+ rc = ptlrpc_server_hpreq_check(req);
+ if (rc < 0)
+ RETURN(rc);
+
+ spin_lock(&svc->srv_lock);
+ /* Before inserting the request into the queue, check if it is not
+ * inserted yet, or even already handled -- it may happen due to
+ * a racing ldlm_server_blocking_ast(). */
+ if (req->rq_phase == RQ_PHASE_NEW && list_empty(&req->rq_list)) {
+ if (rc)
+ ptlrpc_hpreq_reorder_nolock(svc, req);
+ else
+ list_add_tail(&req->rq_list, &svc->srv_request_queue);
+ }
+ spin_unlock(&svc->srv_lock);
+
+ RETURN(0);
+}
+
+/* Only allow normal priority requests on a service that has a high-priority
+ * queue if forced (i.e. cleanup), if there are other high priority requests
+ * already being processed (i.e. those threads can service more high-priority
+ * requests), or if there are enough idle threads that a later thread can do
+ * a high priority request. */
+static int ptlrpc_server_allow_normal(struct ptlrpc_service *svc, int force)
+{
+ return force || !svc->srv_hpreq_handler || svc->srv_n_hpreq > 0 ||
+ svc->srv_n_active_reqs < svc->srv_threads_running - 2;
+}
+
+static struct ptlrpc_request *
+ptlrpc_server_request_get(struct ptlrpc_service *svc, int force)
+{
+ struct ptlrpc_request *req = NULL;
+ ENTRY;
+
+ if (ptlrpc_server_allow_normal(svc, force) &&
+ !list_empty(&svc->srv_request_queue) &&
+ (list_empty(&svc->srv_request_hpq) ||
+ svc->srv_hpreq_count >= svc->srv_hpreq_ratio)) {
+ req = list_entry(svc->srv_request_queue.next,
+ struct ptlrpc_request, rq_list);
+ svc->srv_hpreq_count = 0;
+ } else if (!list_empty(&svc->srv_request_hpq)) {
+ req = list_entry(svc->srv_request_hpq.next,
+ struct ptlrpc_request, rq_list);
+ svc->srv_hpreq_count++;
+ }
+ RETURN(req);
+}
+
+static int ptlrpc_server_request_pending(struct ptlrpc_service *svc, int force)
+{
+ return ((ptlrpc_server_allow_normal(svc, force) &&
+ !list_empty(&svc->srv_request_queue)) ||
+ !list_empty(&svc->srv_request_hpq));
+}
+
+/* Handle freshly incoming reqs, add to timed early reply list,
+ pass on to regular request queue */
+static int
+ptlrpc_server_handle_req_in(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request *req;
+ __u32 deadline;
+ int rc;
+ ENTRY;
+
+ LASSERT(svc);
+
+ spin_lock(&svc->srv_lock);
+ if (list_empty(&svc->srv_req_in_queue)) {
+ spin_unlock(&svc->srv_lock);
+ RETURN(0);
+ }
+
+ req = list_entry(svc->srv_req_in_queue.next,
+ struct ptlrpc_request, rq_list);
+ list_del_init (&req->rq_list);
+ /* Consider this still a "queued" request as far as stats are
+ concerned */
+ spin_unlock(&svc->srv_lock);
+
+ /* go through security check/transform */
+ rc = sptlrpc_svc_unwrap_request(req);
+ switch (rc) {
+ case SECSVC_OK:
+ break;
+ case SECSVC_COMPLETE:
+ target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
+ goto err_req;
+ case SECSVC_DROP:
+ goto err_req;
+ default:
+ LBUG();
+ }
+
+ /*
+ * for null-flavored rpc, msg has been unpacked by sptlrpc, although
+ * redo it wouldn't be harmful.
+ */
+ if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
+ rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen);
+ if (rc != 0) {
+ CERROR("error unpacking request: ptl %d from %s "
+ "x"LPU64"\n", svc->srv_req_portal,
+ libcfs_id2str(req->rq_peer), req->rq_xid);
+ goto err_req;
+ }
+ }
+
+ rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
+ if (rc) {
+ CERROR ("error unpacking ptlrpc body: ptl %d from %s x"
+ LPU64"\n", svc->srv_req_portal,
+ libcfs_id2str(req->rq_peer), req->rq_xid);
+ goto err_req;
+ }
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) &&
+ lustre_msg_get_opc(req->rq_reqmsg) == obd_fail_val) {
+ CERROR("drop incoming rpc opc %u, x"LPU64"\n",
+ obd_fail_val, req->rq_xid);
+ goto err_req;
+ }
+
+ rc = -EINVAL;
+ if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
+ CERROR("wrong packet type received (type=%u) from %s\n",
+ lustre_msg_get_type(req->rq_reqmsg),
+ libcfs_id2str(req->rq_peer));
+ goto err_req;
+ }
+
+ switch(lustre_msg_get_opc(req->rq_reqmsg)) {
+ case MDS_WRITEPAGE:
+ case OST_WRITE:
+ req->rq_bulk_write = 1;
+ break;
+ case MDS_READPAGE:
+ case OST_READ:
+ req->rq_bulk_read = 1;
+ break;
+ }
+
+ CDEBUG(D_NET, "got req "LPU64"\n", req->rq_xid);
+
+ req->rq_export = class_conn2export(
+ lustre_msg_get_handle(req->rq_reqmsg));
+ if (req->rq_export) {
+ rc = ptlrpc_check_req(req);
+ if (rc == 0) {
+ rc = sptlrpc_target_export_check(req->rq_export, req);
+ if (rc)
+ DEBUG_REQ(D_ERROR, req, "DROPPING req with "
+ "illegal security flavor,");
+ }
+
+ if (rc)
+ goto err_req;
+ ptlrpc_update_export_timer(req->rq_export, 0);
+ }
+
+ /* req_in handling should/must be fast */
+ if (cfs_time_current_sec() - req->rq_arrival_time.tv_sec > 5)
+ DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
+ cfs_time_sub(cfs_time_current_sec(),
+ req->rq_arrival_time.tv_sec));
+
+ /* Set rpc server deadline and add it to the timed list */
+ deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) &
+ MSGHDR_AT_SUPPORT) ?
+ /* The max time the client expects us to take */
+ lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout;
+ req->rq_deadline = req->rq_arrival_time.tv_sec + deadline;
+ if (unlikely(deadline == 0)) {
+ DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout");
+ goto err_req;
+ }
+
+ ptlrpc_at_add_timed(req);
+ rc = ptlrpc_hpreq_init(svc, req);
+ if (rc)
+ GOTO(err_req, rc);
+
+ /* Move it over to the request processing queue */
+ rc = ptlrpc_server_request_add(svc, req);
+ if (rc)
+ GOTO(err_req, rc);
+ cfs_waitq_signal(&svc->srv_waitq);
+ RETURN(1);
+
+err_req:
+ spin_lock(&svc->srv_lock);
+ svc->srv_n_queued_reqs--;
+ svc->srv_n_active_reqs++;
+ spin_unlock(&svc->srv_lock);
+ ptlrpc_server_finish_request(req);
+
+ RETURN(1);
+}
+
+static int
+ptlrpc_server_handle_request(struct ptlrpc_service *svc,
+ struct ptlrpc_thread *thread)
+{
+ struct obd_export *export = NULL;
struct ptlrpc_request *request;
- unsigned long flags;
struct timeval work_start;
struct timeval work_end;
long timediff;
- int rc;
+ int opc, rc;
+ int fail_opc = 0;
ENTRY;
- spin_lock_irqsave (&svc->srv_lock, flags);
- if (list_empty (&svc->srv_request_queue) ||
- (svc->srv_n_difficult_replies != 0 &&
- svc->srv_n_active_reqs >= (svc->srv_nthreads - 1))) {
- /* If all the other threads are handling requests, I must
- * remain free to handle any 'difficult' reply that might
- * block them */
- spin_unlock_irqrestore (&svc->srv_lock, flags);
+ LASSERT(svc);
+
+ spin_lock(&svc->srv_lock);
+ if (unlikely(!ptlrpc_server_request_pending(svc, 0) ||
+ (
+#ifndef __KERNEL__
+ /* !@%$# liblustre only has 1 thread */
+ atomic_read(&svc->srv_n_difficult_replies) != 0 &&
+#endif
+ svc->srv_n_active_reqs >= (svc->srv_threads_running - 1)))) {
+ /* Don't handle regular requests in the last thread, in order * re
+ * to handle difficult replies (which might block other threads)
+ * as well as handle any incoming reqs, early replies, etc.
+ * That means we always need at least 2 service threads. */
+ spin_unlock(&svc->srv_lock);
RETURN(0);
+ }
+
+ request = ptlrpc_server_request_get(svc, 0);
+ if (request == NULL) {
+ spin_unlock(&svc->srv_lock);
+ RETURN(0);
+ }
+
+ opc = lustre_msg_get_opc(request->rq_reqmsg);
+ if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT))
+ fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT;
+ else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
+ fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT;
+
+ if (unlikely(fail_opc)) {
+ if (request->rq_export && request->rq_ops) {
+ spin_unlock(&svc->srv_lock);
+ OBD_FAIL_TIMEOUT(fail_opc, 4);
+ spin_lock(&svc->srv_lock);
+ request = ptlrpc_server_request_get(svc, 0);
+ if (request == NULL) {
+ spin_unlock(&svc->srv_lock);
+ RETURN(0);
+ }
+ LASSERT(ptlrpc_server_request_pending(svc, 0));
+ }
}
- request = list_entry (svc->srv_request_queue.next,
- struct ptlrpc_request, rq_list);
- list_del_init (&request->rq_list);
+ list_del_init(&request->rq_list);
svc->srv_n_queued_reqs--;
svc->srv_n_active_reqs++;
+ if (request->rq_hp)
+ svc->srv_n_hpreq++;
- spin_unlock_irqrestore (&svc->srv_lock, flags);
+ /* The phase is changed under the lock here because we need to know
+ * the request is under processing (see ptlrpc_hpreq_reorder()). */
+ ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET);
+ spin_unlock(&svc->srv_lock);
+
+ ptlrpc_hpreq_fini(request);
+
+ if(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
+ libcfs_debug_dumplog();
do_gettimeofday(&work_start);
- timediff = timeval_sub(&work_start, &request->rq_arrival_time);
- if (svc->srv_stats != NULL) {
+ timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
+ if (likely(svc->srv_stats != NULL)) {
lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
timediff);
lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
svc->srv_n_queued_reqs);
lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
svc->srv_n_active_reqs);
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT,
+ at_get(&svc->srv_at_estimate));
}
-#if SWAB_PARANOIA
- /* Clear request swab mask; this is a new request */
- request->rq_req_swab_mask = 0;
-#endif
- rc = lustre_unpack_msg (request->rq_reqmsg, request->rq_reqlen);
- if (rc != 0) {
- CERROR ("error unpacking request: ptl %d from "LPX64
- " xid "LPU64"\n", svc->srv_req_portal,
- request->rq_peer.peer_nid, request->rq_xid);
- goto out;
- }
-
- rc = -EINVAL;
- if (request->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
- CERROR("wrong packet type received (type=%u) from "
- LPX64"\n", request->rq_reqmsg->type,
- request->rq_peer.peer_nid);
- goto out;
+ rc = lu_context_init(&request->rq_session,
+ LCT_SESSION|LCT_REMEMBER|LCT_NOREF);
+ if (rc) {
+ CERROR("Failure to initialize session: %d\n", rc);
+ goto out_req;
}
+ request->rq_session.lc_thread = thread;
+ request->rq_session.lc_cookie = 0x5;
+ lu_context_enter(&request->rq_session);
- CDEBUG(D_NET, "got req "LPD64"\n", request->rq_xid);
-
- /* Discard requests queued for longer than my timeout. If the
- * client's timeout is similar to mine, she'll be timing out this
- * REQ anyway (bug 1502) */
- if (timediff / 1000000 > (long)obd_timeout) {
- CERROR("Dropping timed-out request from "LPX64
- ": %ld seconds old\n",
- request->rq_peer.peer_nid, timediff / 1000000);
- goto out;
- }
+ CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
- request->rq_export = class_conn2export(&request->rq_reqmsg->handle);
+ request->rq_svc_thread = thread;
+ if (thread)
+ request->rq_svc_thread->t_env->le_ses = &request->rq_session;
- if (request->rq_export) {
- if (request->rq_reqmsg->conn_cnt <
- request->rq_export->exp_conn_cnt) {
- DEBUG_REQ(D_ERROR, request,
- "DROPPING req from old connection %d < %d",
- request->rq_reqmsg->conn_cnt,
- request->rq_export->exp_conn_cnt);
+ if (likely(request->rq_export)) {
+ if (unlikely(ptlrpc_check_req(request)))
goto put_conn;
- }
+ ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
+ export = class_export_rpc_get(request->rq_export);
+ }
- request->rq_export->exp_last_request_time =
- LTIME_S(CURRENT_TIME);
+ /* Discard requests queued for longer than the deadline.
+ The deadline is increased if we send an early reply. */
+ if (cfs_time_current_sec() > request->rq_deadline) {
+ DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s"
+ ": deadline "CFS_DURATION_T":"CFS_DURATION_T"s ago\n",
+ libcfs_id2str(request->rq_peer),
+ cfs_time_sub(request->rq_deadline,
+ request->rq_arrival_time.tv_sec),
+ cfs_time_sub(cfs_time_current_sec(),
+ request->rq_deadline));
+ goto put_rpc_export;
}
- CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:ni:nid:opc "
- "%s:%s+%d:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
+ CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
+ "%s:%s+%d:%d:x"LPU64":%s:%d\n", cfs_curproc_comm(),
(request->rq_export ?
(char *)request->rq_export->exp_client_uuid.uuid : "0"),
(request->rq_export ?
atomic_read(&request->rq_export->exp_refcount) : -99),
- request->rq_reqmsg->status, request->rq_xid,
- request->rq_peer.peer_ni->pni_name,
- request->rq_peer.peer_nid,
- request->rq_reqmsg->opc);
+ lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
+ libcfs_id2str(request->rq_peer),
+ lustre_msg_get_opc(request->rq_reqmsg));
+
+ if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
+ OBD_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, obd_fail_val);
rc = svc->srv_handler(request);
- CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:ni:nid:opc "
- "%s:%s+%d:%d:"LPU64":%s:"LPX64":%d\n", current->comm,
- (request->rq_export ?
- (char *)request->rq_export->exp_client_uuid.uuid : "0"),
- (request->rq_export ?
- atomic_read(&request->rq_export->exp_refcount) : -99),
- request->rq_reqmsg->status, request->rq_xid,
- request->rq_peer.peer_ni->pni_name,
- request->rq_peer.peer_nid,
- request->rq_reqmsg->opc);
+ ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
+
+put_rpc_export:
+ if (export != NULL)
+ class_export_rpc_put(export);
put_conn:
- if (request->rq_export != NULL)
- class_export_put(request->rq_export);
+ lu_context_exit(&request->rq_session);
+ lu_context_fini(&request->rq_session);
+
+ if (unlikely(cfs_time_current_sec() > request->rq_deadline)) {
+ DEBUG_REQ(D_WARNING, request, "Request x"LPU64" took longer "
+ "than estimated ("CFS_DURATION_T":"CFS_DURATION_T"s);"
+ " client may timeout.",
+ request->rq_xid, cfs_time_sub(request->rq_deadline,
+ request->rq_arrival_time.tv_sec),
+ cfs_time_sub(cfs_time_current_sec(),
+ request->rq_deadline));
+ }
- out:
do_gettimeofday(&work_end);
-
- timediff = timeval_sub(&work_end, &work_start);
-
- CDEBUG((timediff / 1000000 > (long)obd_timeout) ? D_ERROR : D_HA,
- "request "LPU64" opc %u from NID "LPX64" processed in %ldus "
- "(%ldus total)\n", request->rq_xid, request->rq_reqmsg->opc,
- request->rq_peer.peer_nid,
- timediff, timeval_sub(&work_end, &request->rq_arrival_time));
-
- if (svc->srv_stats != NULL) {
- int opc = opcode_offset(request->rq_reqmsg->opc);
- if (opc > 0) {
+ timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
+ CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
+ "%s:%s+%d:%d:x"LPU64":%s:%d Request procesed in "
+ "%lds (%lds total) trans "LPU64" rc %d/%d\n",
+ cfs_curproc_comm(),
+ (request->rq_export ?
+ (char *)request->rq_export->exp_client_uuid.uuid : "0"),
+ (request->rq_export ?
+ atomic_read(&request->rq_export->exp_refcount) : -99),
+ lustre_msg_get_status(request->rq_reqmsg),
+ request->rq_xid,
+ libcfs_id2str(request->rq_peer),
+ lustre_msg_get_opc(request->rq_reqmsg),
+ timediff,
+ cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
+ (request->rq_repmsg ?
+ lustre_msg_get_transno(request->rq_repmsg) :
+ request->rq_transno),
+ request->rq_status,
+ (request->rq_repmsg ?
+ lustre_msg_get_status(request->rq_repmsg) : -999));
+ if (likely(svc->srv_stats != NULL && request->rq_reqmsg != NULL)) {
+ __u32 op = lustre_msg_get_opc(request->rq_reqmsg);
+ int opc = opcode_offset(op);
+ if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) {
LASSERT(opc < LUSTRE_MAX_OPCODES);
lprocfs_counter_add(svc->srv_stats,
- opc + PTLRPC_LAST_CNTR,
+ opc + EXTRA_MAX_OPCODES,
timediff);
}
}
+ if (unlikely(request->rq_early_count)) {
+ DEBUG_REQ(D_ADAPTTO, request,
+ "sent %d early replies before finishing in "
+ CFS_DURATION_T"s",
+ request->rq_early_count,
+ cfs_time_sub(work_end.tv_sec,
+ request->rq_arrival_time.tv_sec));
+ }
+
+out_req:
+ spin_lock(&svc->srv_lock);
+ if (request->rq_hp)
+ svc->srv_n_hpreq--;
+ spin_unlock(&svc->srv_lock);
+ ptlrpc_server_finish_request(request);
- ptlrpc_server_free_request(svc, request);
-
RETURN(1);
}
+/**
+ * An internal function to process a single reply state object.
+ */
static int
-ptlrpc_server_handle_reply (struct ptlrpc_service *svc)
+ptlrpc_handle_rs (struct ptlrpc_reply_state *rs)
{
- struct ptlrpc_reply_state *rs;
- unsigned long flags;
+ struct ptlrpc_service *svc = rs->rs_service;
struct obd_export *exp;
struct obd_device *obd;
int nlocks;
int been_handled;
ENTRY;
- spin_lock_irqsave (&svc->srv_lock, flags);
- if (list_empty (&svc->srv_reply_queue)) {
- spin_unlock_irqrestore (&svc->srv_lock, flags);
- RETURN(0);
- }
-
- rs = list_entry (svc->srv_reply_queue.next,
- struct ptlrpc_reply_state, rs_list);
-
exp = rs->rs_export;
obd = exp->exp_obd;
LASSERT (rs->rs_difficult);
LASSERT (rs->rs_scheduled);
-
- list_del_init (&rs->rs_list);
-
- /* Disengage from notifiers carefully (lock ordering!) */
- spin_unlock(&svc->srv_lock);
-
- spin_lock (&obd->obd_uncommitted_replies_lock);
- /* Noop if removed already */
- list_del_init (&rs->rs_obd_list);
- spin_unlock (&obd->obd_uncommitted_replies_lock);
+ LASSERT (list_empty(&rs->rs_list));
spin_lock (&exp->exp_lock);
/* Noop if removed already */
list_del_init (&rs->rs_exp_list);
spin_unlock (&exp->exp_lock);
- spin_lock(&svc->srv_lock);
+ /* The disk commit callback holds exp_uncommitted_replies_lock while it
+ * iterates over newly committed replies, removing them from
+ * exp_uncommitted_replies. It then drops this lock and schedules the
+ * replies it found for handling here.
+ *
+ * We can avoid contention for exp_uncommitted_replies_lock between the
+ * HRT threads and further commit callbacks by checking rs_committed
+ * which is set in the commit callback while it holds both
+ * rs_lock and exp_uncommitted_reples.
+ *
+ * If we see rs_committed clear, the commit callback _may_ not have
+ * handled this reply yet and we race with it to grab
+ * exp_uncommitted_replies_lock before removing the reply from
+ * exp_uncommitted_replies. Note that if we lose the race and the
+ * reply has already been removed, list_del_init() is a noop.
+ *
+ * If we see rs_committed set, we know the commit callback is handling,
+ * or has handled this reply since store reordering might allow us to
+ * see rs_committed set out of sequence. But since this is done
+ * holding rs_lock, we can be sure it has all completed once we hold
+ * rs_lock, which we do right next.
+ */
+ if (!rs->rs_committed) {
+ spin_lock(&exp->exp_uncommitted_replies_lock);
+ list_del_init(&rs->rs_obd_list);
+ spin_unlock(&exp->exp_uncommitted_replies_lock);
+ }
+
+ spin_lock(&rs->rs_lock);
been_handled = rs->rs_handled;
rs->rs_handled = 1;
-
+
nlocks = rs->rs_nlocks; /* atomic "steal", but */
rs->rs_nlocks = 0; /* locks still on rs_locks! */
/* If we see this, we should already have seen the warning
* in mds_steal_ack_locks() */
CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
- " o%d NID"LPX64"\n",
- rs,
- rs->rs_xid, rs->rs_transno,
- rs->rs_msg.opc, exp->exp_connection->c_peer.peer_nid);
+ " o%d NID %s\n",
+ rs,
+ rs->rs_xid, rs->rs_transno, rs->rs_opc,
+ libcfs_nid2str(exp->exp_connection->c_peer.nid));
}
- if ((!been_handled && rs->rs_on_net) ||
- nlocks > 0) {
- spin_unlock_irqrestore(&svc->srv_lock, flags);
-
+ if ((!been_handled && rs->rs_on_net) || nlocks > 0) {
+ spin_unlock(&rs->rs_lock);
+
if (!been_handled && rs->rs_on_net) {
- PtlMDUnlink(rs->rs_md_h);
+ LNetMDUnlink(rs->rs_md_h);
/* Ignore return code; we're racing with
* completion... */
}
while (nlocks-- > 0)
- ldlm_lock_decref(&rs->rs_locks[nlocks],
+ ldlm_lock_decref(&rs->rs_locks[nlocks],
rs->rs_modes[nlocks]);
- spin_lock_irqsave(&svc->srv_lock, flags);
+ spin_lock(&rs->rs_lock);
}
rs->rs_scheduled = 0;
if (!rs->rs_on_net) {
/* Off the net */
- svc->srv_n_difficult_replies--;
- spin_unlock_irqrestore(&svc->srv_lock, flags);
-
+ spin_unlock(&rs->rs_lock);
+
class_export_put (exp);
rs->rs_export = NULL;
- lustre_free_reply_state (rs);
+ ptlrpc_rs_decref (rs);
atomic_dec (&svc->srv_outstanding_replies);
+ if (atomic_dec_and_test(&svc->srv_n_difficult_replies) &&
+ svc->srv_is_stopping)
+ cfs_waitq_broadcast(&svc->srv_waitq);
RETURN(1);
}
-
+
/* still on the net; callback will schedule */
- spin_unlock_irqrestore (&svc->srv_lock, flags);
+ spin_unlock(&rs->rs_lock);
RETURN(1);
}
#ifndef __KERNEL__
+
+/**
+ * Check whether given service has a reply available for processing
+ * and process it.
+ *
+ * \param svc a ptlrpc service
+ * \retval 0 no replies processed
+ * \retval 1 one reply processed
+ */
+static int
+ptlrpc_server_handle_reply(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_reply_state *rs = NULL;
+ ENTRY;
+
+ spin_lock(&svc->srv_lock);
+ if (!list_empty(&svc->srv_reply_queue)) {
+ rs = list_entry(svc->srv_reply_queue.prev,
+ struct ptlrpc_reply_state,
+ rs_list);
+ list_del_init(&rs->rs_list);
+ }
+ spin_unlock(&svc->srv_lock);
+ if (rs != NULL)
+ ptlrpc_handle_rs(rs);
+ RETURN(rs != NULL);
+}
+
/* FIXME make use of timeout later */
int
-liblustre_check_services (void *arg)
+liblustre_check_services (void *arg)
{
int did_something = 0;
int rc;
struct list_head *tmp, *nxt;
ENTRY;
-
+
/* I'm relying on being single threaded, not to have to lock
* ptlrpc_all_services etc */
list_for_each_safe (tmp, nxt, &ptlrpc_all_services) {
struct ptlrpc_service *svc =
list_entry (tmp, struct ptlrpc_service, srv_list);
-
- if (svc->srv_nthreads != 0) /* I've recursed */
+
+ if (svc->srv_threads_running != 0) /* I've recursed */
continue;
/* service threads can block for bulk, so this limits us
* (arbitrarily) to recursing 1 stack frame per service.
* Note that the problem with recursion is that we have to
* unwind completely before our caller can resume. */
-
- svc->srv_nthreads++;
-
+
+ svc->srv_threads_running++;
+
do {
- rc = ptlrpc_server_handle_reply(svc);
- rc |= ptlrpc_server_handle_request(svc);
+ rc = ptlrpc_server_handle_req_in(svc);
+ rc |= ptlrpc_server_handle_reply(svc);
+ rc |= ptlrpc_at_check_timed(svc);
+ rc |= ptlrpc_server_handle_request(svc, NULL);
rc |= (ptlrpc_server_post_idle_rqbds(svc) > 0);
did_something |= rc;
} while (rc);
-
- svc->srv_nthreads--;
+
+ svc->srv_threads_running--;
}
RETURN(did_something);
}
+#define ptlrpc_stop_all_threads(s) do {} while (0)
#else /* __KERNEL__ */
-/* Don't use daemonize, it removes fs struct from new thread (bug 418) */
-void ptlrpc_daemonize(void)
+static void
+ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
{
- exit_mm(current);
- lustre_daemonize_helper();
- exit_files(current);
- reparent_to_init();
+ int avail = svc->srv_nrqbd_receiving;
+ int low_water = test_req_buffer_pressure ? 0 :
+ svc->srv_nbuf_per_group/2;
+
+ /* NB I'm not locking; just looking. */
+
+ /* CAVEAT EMPTOR: We might be allocating buffers here because we've
+ * allowed the request history to grow out of control. We could put a
+ * sanity check on that here and cull some history if we need the
+ * space. */
+
+ if (avail <= low_water)
+ ptlrpc_grow_req_bufs(svc);
+
+ if (svc->srv_stats)
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_REQBUF_AVAIL_CNTR,
+ avail);
}
static int
ptlrpc_retry_rqbds(void *arg)
{
struct ptlrpc_service *svc = (struct ptlrpc_service *)arg;
-
+
svc->srv_rqbd_timeout = 0;
return (-ETIMEDOUT);
}
struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
struct ptlrpc_service *svc = data->svc;
struct ptlrpc_thread *thread = data->thread;
- unsigned long flags;
+ struct obd_device *dev = data->dev;
+ struct ptlrpc_reply_state *rs;
+#ifdef WITH_GROUP_INFO
+ struct group_info *ginfo = NULL;
+#endif
+ struct lu_env env;
+ int counter = 0, rc = 0;
ENTRY;
- lock_kernel();
- ptlrpc_daemonize();
+ thread->t_pid = cfs_curproc_pid();
+ cfs_daemonize_ctxt(data->name);
+
+#if defined(HAVE_NODE_TO_CPUMASK) && defined(CONFIG_NUMA)
+ /* we need to do this before any per-thread allocation is done so that
+ * we get the per-thread allocations on local node. bug 7342 */
+ if (svc->srv_cpu_affinity) {
+ int cpu, num_cpu;
+
+ for (cpu = 0, num_cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ if (!cpu_online(cpu))
+ continue;
+ if (num_cpu == thread->t_id % num_online_cpus())
+ break;
+ num_cpu++;
+ }
+ set_cpus_allowed(cfs_current(), node_to_cpumask(cpu_to_node(cpu)));
+ }
+#endif
+
+#ifdef WITH_GROUP_INFO
+ ginfo = groups_alloc(0);
+ if (!ginfo) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ set_current_groups(ginfo);
+ put_group_info(ginfo);
+#endif
+
+ if (svc->srv_init != NULL) {
+ rc = svc->srv_init(thread);
+ if (rc)
+ goto out;
+ }
+
+ rc = lu_context_init(&env.le_ctx,
+ svc->srv_ctx_tags|LCT_REMEMBER|LCT_NOREF);
+ if (rc)
+ goto out_srv_fini;
+
+ thread->t_env = &env;
+ env.le_ctx.lc_thread = thread;
+ env.le_ctx.lc_cookie = 0x6;
+
+ /* Alloc reply state structure for this one */
+ OBD_ALLOC_GFP(rs, svc->srv_max_reply_size, CFS_ALLOC_STD);
+ if (!rs) {
+ rc = -ENOMEM;
+ goto out_srv_fini;
+ }
+
+ spin_lock(&svc->srv_lock);
+ /* SVC_STOPPING may already be set here if someone else is trying
+ * to stop the service while this new thread has been dynamically
+ * forked. We still set SVC_RUNNING to let our creator know that
+ * we are now running, however we will exit as soon as possible */
+ thread->t_flags |= SVC_RUNNING;
+ spin_unlock(&svc->srv_lock);
- SIGNAL_MASK_LOCK(current, flags);
- sigfillset(¤t->blocked);
- RECALC_SIGPENDING;
- SIGNAL_MASK_UNLOCK(current, flags);
+ /*
+ * wake up our creator. Note: @data is invalid after this point,
+ * because it's allocated on ptlrpc_start_thread() stack.
+ */
+ cfs_waitq_signal(&thread->t_ctl_waitq);
- THREAD_NAME(current->comm, "%s", data->name);
- unlock_kernel();
+ thread->t_watchdog = lc_watchdog_add(GET_TIMEOUT(svc), NULL, NULL);
- /* Record that the thread is running */
- thread->t_flags = SVC_RUNNING;
- wake_up(&thread->t_ctl_waitq);
+ spin_lock(&svc->srv_lock);
+ svc->srv_threads_running++;
+ list_add(&rs->rs_list, &svc->srv_free_rs_list);
+ spin_unlock(&svc->srv_lock);
+ cfs_waitq_signal(&svc->srv_free_rs_waitq);
- spin_lock_irqsave(&svc->srv_lock, flags);
- svc->srv_nthreads++;
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id,
+ svc->srv_threads_running);
/* XXX maintain a list of all managed devices: insert here */
- while ((thread->t_flags & SVC_STOPPING) == 0 ||
- svc->srv_n_difficult_replies != 0) {
+ while (!(thread->t_flags & SVC_STOPPING) && !svc->srv_is_stopping) {
/* Don't exit while there are replies to be handled */
struct l_wait_info lwi = LWI_TIMEOUT(svc->srv_rqbd_timeout,
ptlrpc_retry_rqbds, svc);
+ lc_watchdog_disable(thread->t_watchdog);
+
+ cond_resched();
+
l_wait_event_exclusive (svc->srv_waitq,
- ((thread->t_flags & SVC_STOPPING) != 0 &&
- svc->srv_n_difficult_replies == 0) ||
+ thread->t_flags & SVC_STOPPING ||
+ svc->srv_is_stopping ||
(!list_empty(&svc->srv_idle_rqbds) &&
svc->srv_rqbd_timeout == 0) ||
- !list_empty (&svc->srv_reply_queue) ||
- (!list_empty (&svc->srv_request_queue) &&
- (svc->srv_n_difficult_replies == 0 ||
- svc->srv_n_active_reqs <
- (svc->srv_nthreads - 1))),
+ !list_empty(&svc->srv_req_in_queue) ||
+ (ptlrpc_server_request_pending(svc, 0) &&
+ (svc->srv_n_active_reqs <
+ (svc->srv_threads_running - 1))) ||
+ svc->srv_at_check,
&lwi);
- if (!list_empty (&svc->srv_reply_queue))
- ptlrpc_server_handle_reply (svc);
+ if (thread->t_flags & SVC_STOPPING || svc->srv_is_stopping)
+ break;
+
+ lc_watchdog_touch(thread->t_watchdog, GET_TIMEOUT(svc));
+
+ ptlrpc_check_rqbd_pool(svc);
+
+ if (svc->srv_threads_started < svc->srv_threads_max &&
+ svc->srv_n_active_reqs >= (svc->srv_threads_started - 1))
+ /* Ignore return code - we tried... */
+ ptlrpc_start_thread(dev, svc);
- /* only handle requests if there are no difficult replies
- * outstanding, or I'm not the last thread handling
- * requests */
- if (!list_empty (&svc->srv_request_queue) &&
- (svc->srv_n_difficult_replies == 0 ||
- svc->srv_n_active_reqs < (svc->srv_nthreads - 1)))
- ptlrpc_server_handle_request (svc);
+ if (!list_empty(&svc->srv_req_in_queue)) {
+ /* Process all incoming reqs before handling any */
+ ptlrpc_server_handle_req_in(svc);
+ /* but limit ourselves in case of flood */
+ if (counter++ < 1000)
+ continue;
+ counter = 0;
+ }
+
+ if (svc->srv_at_check)
+ ptlrpc_at_check_timed(svc);
+
+ /* don't handle requests in the last thread */
+ if (ptlrpc_server_request_pending(svc, 0) &&
+ (svc->srv_n_active_reqs < (svc->srv_threads_running - 1))) {
+ lu_context_enter(&env.le_ctx);
+ ptlrpc_server_handle_request(svc, thread);
+ lu_context_exit(&env.le_ctx);
+ }
if (!list_empty(&svc->srv_idle_rqbds) &&
ptlrpc_server_post_idle_rqbds(svc) < 0) {
/* I just failed to repost request buffers. Wait
* for a timeout (unless something else happens)
* before I try again */
- svc->srv_rqbd_timeout = HZ/10;
+ svc->srv_rqbd_timeout = cfs_time_seconds(1)/10;
+ CDEBUG(D_RPCTRACE,"Posted buffers: %d\n",
+ svc->srv_nrqbd_receiving);
}
}
- spin_lock_irqsave(&svc->srv_lock, flags);
+ lc_watchdog_delete(thread->t_watchdog);
+ thread->t_watchdog = NULL;
- svc->srv_nthreads--; /* must know immediately */
+out_srv_fini:
+ /*
+ * deconstruct service specific state created by ptlrpc_start_thread()
+ */
+ if (svc->srv_done != NULL)
+ svc->srv_done(thread);
+
+ lu_context_fini(&env.le_ctx);
+out:
+ CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n",
+ thread, thread->t_pid, thread->t_id, rc);
+
+ spin_lock(&svc->srv_lock);
+ svc->srv_threads_running--; /* must know immediately */
+ thread->t_id = rc;
thread->t_flags = SVC_STOPPED;
- wake_up(&thread->t_ctl_waitq);
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ cfs_waitq_signal(&thread->t_ctl_waitq);
+ spin_unlock(&svc->srv_lock);
+
+ return rc;
+}
+
+struct ptlrpc_hr_args {
+ int thread_index;
+ int cpu_index;
+ struct ptlrpc_hr_service *hrs;
+};
+
+static int hrt_dont_sleep(struct ptlrpc_hr_thread *t,
+ struct list_head *replies)
+{
+ int result;
+
+ spin_lock(&t->hrt_lock);
+ list_splice_init(&t->hrt_queue, replies);
+ result = test_bit(HRT_STOPPING, &t->hrt_flags) ||
+ !list_empty(replies);
+ spin_unlock(&t->hrt_lock);
+ return result;
+}
+
+static int ptlrpc_hr_main(void *arg)
+{
+ struct ptlrpc_hr_args * hr_args = arg;
+ struct ptlrpc_hr_service *hr = hr_args->hrs;
+ struct ptlrpc_hr_thread *t = &hr->hr_threads[hr_args->thread_index];
+ char threadname[20];
+ CFS_LIST_HEAD(replies);
+
+ snprintf(threadname, sizeof(threadname),
+ "ptlrpc_hr_%d", hr_args->thread_index);
+
+ cfs_daemonize_ctxt(threadname);
+#if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
+ set_cpus_allowed(cfs_current(),
+ node_to_cpumask(cpu_to_node(hr_args->cpu_index)));
+#endif
+ set_bit(HRT_RUNNING, &t->hrt_flags);
+ cfs_waitq_signal(&t->hrt_wait);
+
+ while (!test_bit(HRT_STOPPING, &t->hrt_flags)) {
+
+ cfs_wait_event(t->hrt_wait, hrt_dont_sleep(t, &replies));
+ while (!list_empty(&replies)) {
+ struct ptlrpc_reply_state *rs;
+
+ rs = list_entry(replies.prev,
+ struct ptlrpc_reply_state,
+ rs_list);
+ list_del_init(&rs->rs_list);
+ ptlrpc_handle_rs(rs);
+ }
+ }
+
+ clear_bit(HRT_RUNNING, &t->hrt_flags);
+ complete(&t->hrt_completion);
- CDEBUG(D_NET, "service thread exiting, process %d\n", current->pid);
return 0;
}
+static int ptlrpc_start_hr_thread(struct ptlrpc_hr_service *hr, int n, int cpu)
+{
+ struct ptlrpc_hr_thread *t = &hr->hr_threads[n];
+ struct ptlrpc_hr_args args;
+ int rc;
+ ENTRY;
+
+ args.thread_index = n;
+ args.cpu_index = cpu;
+ args.hrs = hr;
+
+ rc = cfs_kernel_thread(ptlrpc_hr_main, (void*)&args,
+ CLONE_VM|CLONE_FILES);
+ if (rc < 0) {
+ complete(&t->hrt_completion);
+ GOTO(out, rc);
+ }
+ cfs_wait_event(t->hrt_wait, test_bit(HRT_RUNNING, &t->hrt_flags));
+ RETURN(0);
+ out:
+ return rc;
+}
+
+static void ptlrpc_stop_hr_thread(struct ptlrpc_hr_thread *t)
+{
+ ENTRY;
+
+ set_bit(HRT_STOPPING, &t->hrt_flags);
+ cfs_waitq_signal(&t->hrt_wait);
+ wait_for_completion(&t->hrt_completion);
+
+ EXIT;
+}
+
+static void ptlrpc_stop_hr_threads(struct ptlrpc_hr_service *hrs)
+{
+ int n;
+ ENTRY;
+
+ for (n = 0; n < hrs->hr_n_threads; n++)
+ ptlrpc_stop_hr_thread(&hrs->hr_threads[n]);
+
+ EXIT;
+}
+
+static int ptlrpc_start_hr_threads(struct ptlrpc_hr_service *hr)
+{
+ int rc = -ENOMEM;
+ int n, cpu, threads_started = 0;
+ ENTRY;
+
+ LASSERT(hr != NULL);
+ LASSERT(hr->hr_n_threads > 0);
+
+ for (n = 0, cpu = 0; n < hr->hr_n_threads; n++) {
+#if defined(CONFIG_SMP) && defined(HAVE_NODE_TO_CPUMASK)
+ while(!cpu_online(cpu)) {
+ cpu++;
+ if (cpu >= num_possible_cpus())
+ cpu = 0;
+ }
+#endif
+ rc = ptlrpc_start_hr_thread(hr, n, cpu);
+ if (rc != 0)
+ break;
+ threads_started++;
+ cpu++;
+ }
+ if (threads_started == 0) {
+ CERROR("No reply handling threads started\n");
+ RETURN(-ESRCH);
+ }
+ if (threads_started < hr->hr_n_threads) {
+ CWARN("Started only %d reply handling threads from %d\n",
+ threads_started, hr->hr_n_threads);
+ hr->hr_n_threads = threads_started;
+ }
+ RETURN(0);
+}
+
static void ptlrpc_stop_thread(struct ptlrpc_service *svc,
struct ptlrpc_thread *thread)
{
struct l_wait_info lwi = { 0 };
- unsigned long flags;
+ ENTRY;
- spin_lock_irqsave(&svc->srv_lock, flags);
- thread->t_flags = SVC_STOPPING;
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ CDEBUG(D_RPCTRACE, "Stopping thread [ %p : %u ]\n",
+ thread, thread->t_pid);
- wake_up_all(&svc->srv_waitq);
- l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED),
- &lwi);
+ spin_lock(&svc->srv_lock);
+ /* let the thread know that we would like it to stop asap */
+ thread->t_flags |= SVC_STOPPING;
+ spin_unlock(&svc->srv_lock);
- spin_lock_irqsave(&svc->srv_lock, flags);
+ cfs_waitq_broadcast(&svc->srv_waitq);
+ l_wait_event(thread->t_ctl_waitq,
+ (thread->t_flags & SVC_STOPPED), &lwi);
+
+ spin_lock(&svc->srv_lock);
list_del(&thread->t_link);
- spin_unlock_irqrestore(&svc->srv_lock, flags);
-
- OBD_FREE(thread, sizeof(*thread));
+ spin_unlock(&svc->srv_lock);
+
+ OBD_FREE_PTR(thread);
+ EXIT;
}
void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
{
- unsigned long flags;
struct ptlrpc_thread *thread;
+ ENTRY;
- spin_lock_irqsave(&svc->srv_lock, flags);
+ spin_lock(&svc->srv_lock);
while (!list_empty(&svc->srv_threads)) {
- thread = list_entry(svc->srv_threads.next,
+ thread = list_entry(svc->srv_threads.next,
struct ptlrpc_thread, t_link);
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ spin_unlock(&svc->srv_lock);
ptlrpc_stop_thread(svc, thread);
- spin_lock_irqsave(&svc->srv_lock, flags);
+ spin_lock(&svc->srv_lock);
}
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ spin_unlock(&svc->srv_lock);
+ EXIT;
}
-int ptlrpc_start_n_threads(struct obd_device *dev, struct ptlrpc_service *svc,
- int num_threads, char *base_name)
+int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc)
{
int i, rc = 0;
ENTRY;
- for (i = 0; i < num_threads; i++) {
- char name[32];
- sprintf(name, "%s_%02d", base_name, i);
- rc = ptlrpc_start_thread(dev, svc, name);
+ /* We require 2 threads min - see note in
+ ptlrpc_server_handle_request */
+ LASSERT(svc->srv_threads_min >= 2);
+ for (i = 0; i < svc->srv_threads_min; i++) {
+ rc = ptlrpc_start_thread(dev, svc);
+ /* We have enough threads, don't start more. b=15759 */
+ if (rc == -EMFILE)
+ break;
if (rc) {
- CERROR("cannot start %s thread #%d: rc %d\n", base_name,
- i, rc);
+ CERROR("cannot start %s thread #%d: rc %d\n",
+ svc->srv_thread_name, i, rc);
ptlrpc_stop_all_threads(svc);
+ break;
}
}
RETURN(rc);
}
-int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc,
- char *name)
+int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc)
{
struct l_wait_info lwi = { 0 };
struct ptlrpc_svc_data d;
struct ptlrpc_thread *thread;
- unsigned long flags;
- int rc;
+ char name[32];
+ int id, rc;
ENTRY;
- OBD_ALLOC(thread, sizeof(*thread));
+ CDEBUG(D_RPCTRACE, "%s started %d min %d max %d running %d\n",
+ svc->srv_name, svc->srv_threads_started, svc->srv_threads_min,
+ svc->srv_threads_max, svc->srv_threads_running);
+
+ if (unlikely(svc->srv_is_stopping))
+ RETURN(-ESRCH);
+
+ if (unlikely(svc->srv_threads_started >= svc->srv_threads_max) ||
+ (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) &&
+ svc->srv_threads_started == svc->srv_threads_min - 1))
+ RETURN(-EMFILE);
+
+ OBD_ALLOC_PTR(thread);
if (thread == NULL)
RETURN(-ENOMEM);
- init_waitqueue_head(&thread->t_ctl_waitq);
-
+ cfs_waitq_init(&thread->t_ctl_waitq);
+
+ spin_lock(&svc->srv_lock);
+ if (svc->srv_threads_started >= svc->srv_threads_max) {
+ spin_unlock(&svc->srv_lock);
+ OBD_FREE_PTR(thread);
+ RETURN(-EMFILE);
+ }
+ list_add(&thread->t_link, &svc->srv_threads);
+ id = svc->srv_threads_started++;
+ spin_unlock(&svc->srv_lock);
+
+ thread->t_svc = svc;
+ thread->t_id = id;
+ sprintf(name, "%s_%02d", svc->srv_thread_name, id);
d.dev = dev;
d.svc = svc;
d.name = name;
d.thread = thread;
- spin_lock_irqsave(&svc->srv_lock, flags);
- list_add(&thread->t_link, &svc->srv_threads);
- spin_unlock_irqrestore(&svc->srv_lock, flags);
+ CDEBUG(D_RPCTRACE, "starting thread '%s'\n", name);
/* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
- * just drop the VM and FILES in ptlrpc_daemonize() right away.
+ * just drop the VM and FILES in cfs_daemonize_ctxt() right away.
*/
- rc = kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
+ rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
if (rc < 0) {
- CERROR("cannot start thread: %d\n", rc);
+ CERROR("cannot start thread '%s': rc %d\n", name, rc);
+
+ spin_lock(&svc->srv_lock);
+ list_del(&thread->t_link);
+ --svc->srv_threads_started;
+ spin_unlock(&svc->srv_lock);
+
OBD_FREE(thread, sizeof(*thread));
RETURN(rc);
}
- l_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING, &lwi);
+ l_wait_event(thread->t_ctl_waitq,
+ thread->t_flags & (SVC_RUNNING | SVC_STOPPED), &lwi);
- RETURN(0);
+ rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
+ RETURN(rc);
+}
+
+
+int ptlrpc_hr_init(void)
+{
+ int i;
+ int n_cpus = num_online_cpus();
+ struct ptlrpc_hr_service *hr;
+ int size;
+ int rc;
+ ENTRY;
+
+ LASSERT(ptlrpc_hr == NULL);
+
+ size = offsetof(struct ptlrpc_hr_service, hr_threads[n_cpus]);
+ OBD_ALLOC(hr, size);
+ if (hr == NULL)
+ RETURN(-ENOMEM);
+ for (i = 0; i < n_cpus; i++) {
+ struct ptlrpc_hr_thread *t = &hr->hr_threads[i];
+
+ spin_lock_init(&t->hrt_lock);
+ cfs_waitq_init(&t->hrt_wait);
+ CFS_INIT_LIST_HEAD(&t->hrt_queue);
+ init_completion(&t->hrt_completion);
+ }
+ hr->hr_n_threads = n_cpus;
+ hr->hr_size = size;
+ ptlrpc_hr = hr;
+
+ rc = ptlrpc_start_hr_threads(hr);
+ if (rc) {
+ OBD_FREE(hr, hr->hr_size);
+ ptlrpc_hr = NULL;
+ }
+ RETURN(rc);
+}
+
+void ptlrpc_hr_fini(void)
+{
+ if (ptlrpc_hr != NULL) {
+ ptlrpc_stop_hr_threads(ptlrpc_hr);
+ OBD_FREE(ptlrpc_hr, ptlrpc_hr->hr_size);
+ ptlrpc_hr = NULL;
+ }
+}
+
+#endif /* __KERNEL__ */
+
+/**
+ * Wait until all already scheduled replies are processed.
+ */
+static void ptlrpc_wait_replies(struct ptlrpc_service *svc)
+{
+ while (1) {
+ int rc;
+ struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
+ NULL, NULL);
+ rc = l_wait_event(svc->srv_waitq,
+ atomic_read(&svc->srv_n_difficult_replies) == 0,
+ &lwi);
+ if (rc == 0)
+ break;
+ CWARN("Unexpectedly long timeout %p\n", svc);
+ }
}
-#endif
int ptlrpc_unregister_service(struct ptlrpc_service *service)
{
- int i;
int rc;
- unsigned long flags;
- struct ptlrpc_srv_ni *srv_ni;
struct l_wait_info lwi;
struct list_head *tmp;
+ struct ptlrpc_reply_state *rs, *t;
+ struct ptlrpc_at_array *array = &service->srv_at_array;
+ ENTRY;
+
+ service->srv_is_stopping = 1;
+ cfs_timer_disarm(&service->srv_at_timer);
+ ptlrpc_stop_all_threads(service);
LASSERT(list_empty(&service->srv_threads));
spin_lock (&ptlrpc_all_services_lock);
ptlrpc_lprocfs_unregister_service(service);
- for (i = 0; i < ptlrpc_ninterfaces; i++) {
- srv_ni = &service->srv_interfaces[i];
- CDEBUG(D_NET, "%s: tearing down interface %s\n",
- service->srv_name, srv_ni->sni_ni->pni_name);
+ /* All history will be culled when the next request buffer is
+ * freed */
+ service->srv_max_history_rqbds = 0;
- /* Unlink all the request buffers. This forces a 'final'
- * event with its 'unlink' flag set for each posted rqbd */
- list_for_each(tmp, &srv_ni->sni_active_rqbds) {
- struct ptlrpc_request_buffer_desc *rqbd =
- list_entry(tmp, struct ptlrpc_request_buffer_desc,
- rqbd_list);
+ CDEBUG(D_NET, "%s: tearing down\n", service->srv_name);
- rc = PtlMDUnlink(rqbd->rqbd_md_h);
- LASSERT (rc == PTL_OK || rc == PTL_MD_INVALID);
- }
+ rc = LNetClearLazyPortal(service->srv_req_portal);
+ LASSERT (rc == 0);
- /* Wait for the network to release any buffers it's
- * currently filling */
- for (;;) {
- spin_lock_irqsave(&service->srv_lock, flags);
- rc = srv_ni->sni_nrqbd_receiving;
- spin_unlock_irqrestore(&service->srv_lock, flags);
+ /* Unlink all the request buffers. This forces a 'final' event with
+ * its 'unlink' flag set for each posted rqbd */
+ list_for_each(tmp, &service->srv_active_rqbds) {
+ struct ptlrpc_request_buffer_desc *rqbd =
+ list_entry(tmp, struct ptlrpc_request_buffer_desc,
+ rqbd_list);
- if (rc == 0)
- break;
-
- /* Network access will complete in finite time but
- * the HUGE timeout lets us CWARN for visibility of
- * sluggish NALs */
- lwi = LWI_TIMEOUT(300 * HZ, NULL, NULL);
- rc = l_wait_event(service->srv_waitq,
- srv_ni->sni_nrqbd_receiving == 0,
- &lwi);
- if (rc == -ETIMEDOUT)
- CWARN("Waiting for request buffers on "
- "service %s on interface %s ",
- service->srv_name, srv_ni->sni_ni->pni_name);
- }
+ rc = LNetMDUnlink(rqbd->rqbd_md_h);
+ LASSERT (rc == 0 || rc == -ENOENT);
+ }
- /* schedule all outstanding replies to terminate them */
- spin_lock_irqsave(&service->srv_lock, flags);
- while (!list_empty(&srv_ni->sni_active_replies)) {
- struct ptlrpc_reply_state *rs =
- list_entry(srv_ni->sni_active_replies.next,
- struct ptlrpc_reply_state,
- rs_list);
- ptlrpc_schedule_difficult_reply(rs);
- }
- spin_unlock_irqrestore(&service->srv_lock, flags);
+ /* Wait for the network to release any buffers it's currently
+ * filling */
+ for (;;) {
+ spin_lock(&service->srv_lock);
+ rc = service->srv_nrqbd_receiving;
+ spin_unlock(&service->srv_lock);
+
+ if (rc == 0)
+ break;
+
+ /* Network access will complete in finite time but the HUGE
+ * timeout lets us CWARN for visibility of sluggish NALs */
+ lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
+ cfs_time_seconds(1), NULL, NULL);
+ rc = l_wait_event(service->srv_waitq,
+ service->srv_nrqbd_receiving == 0,
+ &lwi);
+ if (rc == -ETIMEDOUT)
+ CWARN("Service %s waiting for request buffers\n",
+ service->srv_name);
}
+ /* schedule all outstanding replies to terminate them */
+ spin_lock(&service->srv_lock);
+ while (!list_empty(&service->srv_active_replies)) {
+ struct ptlrpc_reply_state *rs =
+ list_entry(service->srv_active_replies.next,
+ struct ptlrpc_reply_state, rs_list);
+ spin_lock(&rs->rs_lock);
+ ptlrpc_schedule_difficult_reply(rs);
+ spin_unlock(&rs->rs_lock);
+ }
+ spin_unlock(&service->srv_lock);
+
/* purge the request queue. NB No new replies (rqbds all unlinked)
* and no service threads, so I'm the only thread noodling the
* request queue now */
- while (!list_empty(&service->srv_request_queue)) {
+ while (!list_empty(&service->srv_req_in_queue)) {
struct ptlrpc_request *req =
- list_entry(service->srv_request_queue.next,
+ list_entry(service->srv_req_in_queue.next,
struct ptlrpc_request,
rq_list);
-
+
list_del(&req->rq_list);
service->srv_n_queued_reqs--;
service->srv_n_active_reqs++;
+ ptlrpc_server_finish_request(req);
+ }
+ while (ptlrpc_server_request_pending(service, 1)) {
+ struct ptlrpc_request *req;
- ptlrpc_server_free_request(service, req);
+ req = ptlrpc_server_request_get(service, 1);
+ list_del(&req->rq_list);
+ service->srv_n_queued_reqs--;
+ service->srv_n_active_reqs++;
+ ptlrpc_hpreq_fini(req);
+ ptlrpc_server_finish_request(req);
}
LASSERT(service->srv_n_queued_reqs == 0);
LASSERT(service->srv_n_active_reqs == 0);
-
- for (i = 0; i < ptlrpc_ninterfaces; i++) {
- srv_ni = &service->srv_interfaces[i];
- LASSERT(list_empty(&srv_ni->sni_active_rqbds));
- }
+ LASSERT(service->srv_n_history_rqbds == 0);
+ LASSERT(list_empty(&service->srv_active_rqbds));
/* Now free all the request buffers since nothing references them
* any more... */
while (!list_empty(&service->srv_idle_rqbds)) {
struct ptlrpc_request_buffer_desc *rqbd =
list_entry(service->srv_idle_rqbds.next,
- struct ptlrpc_request_buffer_desc,
+ struct ptlrpc_request_buffer_desc,
rqbd_list);
ptlrpc_free_rqbd(rqbd);
}
- /* wait for all outstanding replies to complete (they were
- * scheduled having been flagged to abort above) */
- while (atomic_read(&service->srv_outstanding_replies) != 0) {
- struct l_wait_info lwi = LWI_TIMEOUT(10 * HZ, NULL, NULL);
+ ptlrpc_wait_replies(service);
- rc = l_wait_event(service->srv_waitq,
- !list_empty(&service->srv_reply_queue), &lwi);
- LASSERT(rc == 0 || rc == -ETIMEDOUT);
+ list_for_each_entry_safe(rs, t, &service->srv_free_rs_list, rs_list) {
+ list_del(&rs->rs_list);
+ OBD_FREE(rs, service->srv_max_reply_size);
+ }
- if (rc == 0) {
- ptlrpc_server_handle_reply(service);
- continue;
- }
- CWARN("Unexpectedly long timeout %p\n", service);
+ /* In case somebody rearmed this in the meantime */
+ cfs_timer_disarm(&service->srv_at_timer);
+
+ if (array->paa_reqs_array != NULL) {
+ OBD_FREE(array->paa_reqs_array,
+ sizeof(struct list_head) * array->paa_size);
+ array->paa_reqs_array = NULL;
+ }
+
+ if (array->paa_reqs_count != NULL) {
+ OBD_FREE(array->paa_reqs_count,
+ sizeof(__u32) * array->paa_size);
+ array->paa_reqs_count= NULL;
+ }
+
+ OBD_FREE_PTR(service);
+ RETURN(0);
+}
+
+/* Returns 0 if the service is healthy.
+ *
+ * Right now, it just checks to make sure that requests aren't languishing
+ * in the queue. We'll use this health check to govern whether a node needs
+ * to be shot, so it's intentionally non-aggressive. */
+int ptlrpc_service_health_check(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_request *request;
+ struct timeval right_now;
+ long timediff;
+
+ if (svc == NULL)
+ return 0;
+
+ do_gettimeofday(&right_now);
+
+ spin_lock(&svc->srv_lock);
+ if (!ptlrpc_server_request_pending(svc, 1)) {
+ spin_unlock(&svc->srv_lock);
+ return 0;
+ }
+
+ /* How long has the next entry been waiting? */
+ if (list_empty(&svc->srv_request_queue))
+ request = list_entry(svc->srv_request_hpq.next,
+ struct ptlrpc_request, rq_list);
+ else
+ request = list_entry(svc->srv_request_queue.next,
+ struct ptlrpc_request, rq_list);
+ timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
+ spin_unlock(&svc->srv_lock);
+
+ if ((timediff / ONE_MILLION) > (AT_OFF ? obd_timeout * 3/2 :
+ at_max)) {
+ CERROR("%s: unhealthy - request has been waiting %lds\n",
+ svc->srv_name, timediff / ONE_MILLION);
+ return (-1);
}
- OBD_FREE(service,
- offsetof(struct ptlrpc_service,
- srv_interfaces[ptlrpc_ninterfaces]));
return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff