/* -*- 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 the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * You may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * 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.
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source 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 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).
*
- * In either case, 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
- * license text for more details.
+ * 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 <libcfs/kp30.h>
#endif
#include <obd_support.h>
#include <obd_class.h>
#include <lnet/types.h>
#include "ptlrpc_internal.h"
+/* 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);
}
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);
- idx = rs->rs_nlocks++;
- rs->rs_locks[idx] = *lock;
- rs->rs_modes[idx] = mode;
- rs->rs_difficult = 1;
+ 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;
+ }
}
-void
-ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs)
+#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
+
+/**
+ * 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;
-#ifdef CONFIG_SMP
- LASSERT (spin_is_locked (&svc->srv_lock));
+ 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)
+{
+ ENTRY;
+
+ 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);
- cfs_waitq_signal (&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;
+ 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(&obd->obd_uncommitted_replies_lock);
-
- 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_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(&obd->obd_uncommitted_replies_lock);
+ spin_unlock(&exp->exp_uncommitted_replies_lock);
+ rs_batch_fini(&batch);
+ EXIT;
}
static int
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_timeout,
+ c->psc_watchdog_factor,
h, name, proc_entry,
prntfn, c->psc_min_threads, c->psc_max_threads,
- threadname, c->psc_ctx_tags);
+ 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 max_reply_size,
- int req_portal, int rep_portal, int watchdog_timeout,
+ int req_portal, int rep_portal, int watchdog_factor,
svc_handler_t handler, char *name,
cfs_proc_dir_entry_t *proc_entry,
svcreq_printfn_t svcreq_printfn,
int min_threads, int max_threads,
- char *threadname, __u32 ctx_tags)
+ char *threadname, __u32 ctx_tags,
+ svc_hpreq_handler_t hp_handler)
{
- int rc;
- struct ptlrpc_service *service;
+ int rc;
+ struct ptlrpc_at_array *array;
+ struct ptlrpc_service *service;
+ unsigned int size, index;
ENTRY;
LASSERT (nbufs > 0);
service->srv_buf_size = bufsize;
service->srv_rep_portal = rep_portal;
service->srv_req_portal = req_portal;
- service->srv_watchdog_timeout = watchdog_timeout;
+ 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_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);
+
+ spin_lock_init(&service->srv_at_lock);
+ CFS_INIT_LIST_HEAD(&service->srv_req_in_queue);
+
+ array = &service->srv_at_array;
+ size = at_est2timeout(at_max);
+ array->paa_size = size;
+ array->paa_count = 0;
+ array->paa_deadline = -1;
+
+ /* 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);
return NULL;
}
-static void __ptlrpc_server_free_request(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)
{
- struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd;
+ LASSERT(atomic_read(&req->rq_refcount) == 0);
+ LASSERT(list_empty(&req->rq_timed_list));
- list_del(&req->rq_list);
-
- if (req->rq_reply_state != NULL) {
- ptlrpc_rs_decref(req->rq_reply_state);
- req->rq_reply_state = NULL;
- }
+ /* 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 != &rqbd->rqbd_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! */
}
}
-static void
-ptlrpc_server_free_request(struct ptlrpc_request *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;
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--;
req = list_entry(rqbd->rqbd_reqs.next,
struct ptlrpc_request,
rq_list);
- __ptlrpc_server_free_request(req);
+ list_del(&req->rq_list);
+ ptlrpc_server_free_request(req);
}
spin_lock(&svc->srv_lock);
-
- /* schedule request buffer for re-use.
- * NB I can only do this after I've disposed of their
- * reqs; particularly the embedded req */
+ /*
+ * 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_history_list);
- __ptlrpc_server_free_request(req);
- }
+ /* 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);
- spin_unlock(&svc->srv_lock);
+ ptlrpc_server_free_request(req);
+ } else {
+ spin_unlock(&svc->srv_lock);
+ }
+}
+/**
+ * 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);
}
/* This function makes sure dead exports are evicted in a timely manner.
static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
{
struct obd_export *oldest_exp;
- time_t oldest_time;
+ time_t oldest_time, new_time;
ENTRY;
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. */
- exp->exp_last_request_time = max(exp->exp_last_request_time,
- cfs_time_current_sec() + extra_delay);
+ /* 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);
if (list_empty(&exp->exp_obd_chain_timed)) {
/* this one is not timed */
spin_unlock(&exp->exp_obd->obd_dev_lock);
- EXIT;
- return;
+ RETURN_EXIT;
}
list_move_tail(&exp->exp_obd_chain_timed,
/* 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 +
- (3 * obd_timeout / 2) + extra_delay)) {
+ 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;
+ 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(exp),
- oldest_time);
+ 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)) {
+ 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. */
EXIT;
}
-#ifndef __KERNEL__
-int lu_context_init(struct lu_context *ctx, __u32 tags)
+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;
}
-void lu_context_fini(struct lu_context *ctx)
-{
-}
+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);
-void lu_context_enter(struct lu_context *ctx)
-{
-}
+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);
-void lu_context_exit(struct lu_context *ctx)
-{
+ RETURN(1);
}
-#endif
-
static int
ptlrpc_server_handle_request(struct ptlrpc_service *svc,
struct ptlrpc_thread *thread)
struct timeval work_start;
struct timeval work_end;
long timediff;
- int rc, reply;
+ int opc, rc;
+ int fail_opc = 0;
ENTRY;
LASSERT(svc);
spin_lock(&svc->srv_lock);
- if (unlikely(list_empty (&svc->srv_request_queue) ||
- (svc->srv_n_difficult_replies != 0 &&
- svc->srv_n_active_reqs >= (svc->srv_threads_running - 1)))) {
- /* If all the other threads are handling requests, I must
- * remain free to handle any 'difficult' reply that might
- * block them */
+ 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++;
+ /* 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 = cfs_timeval_sub(&work_start, &request->rq_arrival_time,NULL);
if (likely(svc->srv_stats != NULL)) {
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));
}
- /* go through security check/transform */
- rc = sptlrpc_svc_unwrap_request(request);
- switch (rc) {
- case SECSVC_OK:
- break;
- case SECSVC_COMPLETE:
- target_send_reply(request, 0, OBD_FAIL_MDS_ALL_REPLY_NET);
- goto out_stat;
- case SECSVC_DROP:
- goto out_req;
- default:
- LBUG();
- }
-
- /* Clear request swab mask; this is a new request */
- request->rq_req_swab_mask = 0;
-
- rc = lustre_unpack_msg(request->rq_reqmsg, request->rq_reqlen);
- if (rc != 0) {
- CERROR ("error unpacking request: ptl %d from %s"
- " xid "LPU64"\n", svc->srv_req_portal,
- libcfs_id2str(request->rq_peer), request->rq_xid);
- goto out_req;
- }
-
- rc = lustre_unpack_req_ptlrpc_body(request, MSG_PTLRPC_BODY_OFF);
- if (rc) {
- CERROR ("error unpacking ptlrpc body: ptl %d from %s"
- " xid "LPU64"\n", svc->srv_req_portal,
- libcfs_id2str(request->rq_peer), request->rq_xid);
- goto out_req;
- }
-
- rc = -EINVAL;
- if (lustre_msg_get_type(request->rq_reqmsg) != PTL_RPC_MSG_REQUEST) {
- CERROR("wrong packet type received (type=%u) from %s\n",
- lustre_msg_get_type(request->rq_reqmsg),
- libcfs_id2str(request->rq_peer));
- goto out_req;
- }
-
- rc = lu_context_init(&request->rq_session, LCT_SESSION);
+ 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);
+ CDEBUG(D_NET, "got req "LPU64"\n", request->rq_xid);
request->rq_svc_thread = thread;
if (thread)
request->rq_svc_thread->t_env->le_ses = &request->rq_session;
- request->rq_export = class_conn2export(
- lustre_msg_get_handle(request->rq_reqmsg));
-
if (likely(request->rq_export)) {
- if (unlikely(lustre_msg_get_conn_cnt(request->rq_reqmsg) <
- request->rq_export->exp_conn_cnt)) {
- DEBUG_REQ(D_ERROR, request,
- "DROPPING req from old connection %d < %d",
- lustre_msg_get_conn_cnt(request->rq_reqmsg),
- request->rq_export->exp_conn_cnt);
- goto put_conn;
- }
- if (unlikely(request->rq_export->exp_obd &&
- request->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",
- request, request->rq_export->exp_obd->obd_name);
- request->rq_status = -ENODEV;
- ptlrpc_error(request);
- goto put_conn;
- }
-
- rc = sptlrpc_target_export_check(request->rq_export, request);
- if (unlikely(rc)) {
- DEBUG_REQ(D_ERROR, request,
- "DROPPING req with illegal security flavor,");
+ if (unlikely(ptlrpc_check_req(request)))
goto put_conn;
- }
-
- ptlrpc_update_export_timer(request->rq_export, timediff/500000);
+ ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
export = class_export_rpc_get(request->rq_export);
}
- /* 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 (unlikely(timediff / 1000000 > (long)obd_timeout)) {
- CERROR("Dropping timed-out opc %d request from %s"
- ": %ld seconds old\n",
- lustre_msg_get_opc(request->rq_reqmsg),
- libcfs_id2str(request->rq_peer),
- timediff / 1000000);
+ /* 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;
}
- request->rq_phase = RQ_PHASE_INTERPRET;
-
CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc "
- "%s:%s+%d:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
+ "%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 ?
libcfs_id2str(request->rq_peer),
lustre_msg_get_opc(request->rq_reqmsg));
- rc = svc->srv_handler(request);
+ if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING)
+ OBD_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, obd_fail_val);
- request->rq_phase = RQ_PHASE_COMPLETE;
+ rc = svc->srv_handler(request);
- CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc "
- "%s:%s+%d:%d:"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),
- lustre_msg_get_status(request->rq_reqmsg), request->rq_xid,
- libcfs_id2str(request->rq_peer),
- lustre_msg_get_opc(request->rq_reqmsg));
+ ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
put_rpc_export:
if (export != NULL)
class_export_rpc_put(export);
put_conn:
- if (likely(request->rq_export != NULL))
- class_export_put(request->rq_export);
-
lu_context_exit(&request->rq_session);
lu_context_fini(&request->rq_session);
-out_stat:
- reply = request->rq_reply_state && request->rq_repmsg; /* bug 11169 */
- do_gettimeofday(&work_end);
+ 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));
+ }
+ do_gettimeofday(&work_end);
timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
-
- if (unlikely(timediff / 1000000 > (long)obd_timeout))
- CERROR("request "LPU64" opc %u from %s processed in %lds "
- "trans "LPU64" rc %d/%d\n",
- request->rq_xid,
- request->rq_reqmsg ?
- lustre_msg_get_opc(request->rq_reqmsg) : 0,
- libcfs_id2str(request->rq_peer),
- cfs_timeval_sub(&work_end, &request->rq_arrival_time,
- NULL) / 1000000,
- reply ? lustre_msg_get_transno(request->rq_repmsg) :
- request->rq_transno, request->rq_status,
- reply ? lustre_msg_get_status(request->rq_repmsg) : -999);
- else
- CDEBUG(D_RPCTRACE,"request "LPU64" opc %u from %s processed in "
- "%ldus (%ldus total) trans "LPU64" rc %d/%d\n",
- request->rq_xid,
- request->rq_reqmsg ?
- lustre_msg_get_opc(request->rq_reqmsg) : 0,
- libcfs_id2str(request->rq_peer), timediff,
- cfs_timeval_sub(&work_end, &request->rq_arrival_time,
- NULL),
- request->rq_transno, request->rq_status,
- reply ? lustre_msg_get_status(request->rq_repmsg) : -999);
-
+ 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);
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:
- ptlrpc_server_free_request(request);
+ spin_lock(&svc->srv_lock);
+ if (request->rq_hp)
+ svc->srv_n_hpreq--;
+ spin_unlock(&svc->srv_lock);
+ ptlrpc_server_finish_request(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;
+ struct ptlrpc_service *svc = rs->rs_service;
struct obd_export *exp;
struct obd_device *obd;
int nlocks;
int been_handled;
ENTRY;
- spin_lock(&svc->srv_lock);
- if (list_empty (&svc->srv_reply_queue)) {
- spin_unlock(&svc->srv_lock);
- 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 order - irqrestore below!)*/
- 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;
CWARN("All locks stolen from rs %p x"LPD64".t"LPD64
" o%d NID %s\n",
rs,
- rs->rs_xid, rs->rs_transno,
- lustre_msg_get_opc(rs->rs_msg),
+ 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(&svc->srv_lock);
+ spin_unlock(&rs->rs_lock);
if (!been_handled && rs->rs_on_net) {
LNetMDUnlink(rs->rs_md_h);
ldlm_lock_decref(&rs->rs_locks[nlocks],
rs->rs_modes[nlocks]);
- spin_lock(&svc->srv_lock);
+ spin_lock(&rs->rs_lock);
}
rs->rs_scheduled = 0;
if (!rs->rs_on_net) {
/* Off the net */
- svc->srv_n_difficult_replies--;
- spin_unlock(&svc->srv_lock);
+ spin_unlock(&rs->rs_lock);
class_export_put (exp);
rs->rs_export = NULL;
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(&svc->srv_lock);
+ 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)
svc->srv_threads_running++;
do {
- rc = ptlrpc_server_handle_reply(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;
#else /* __KERNEL__ */
-/* Don't use daemonize, it removes fs struct from new thread (bug 418) */
-void ptlrpc_daemonize(char *name)
-{
- struct fs_struct *fs = current->fs;
-
- atomic_inc(&fs->count);
- cfs_daemonize(name);
- exit_fs(cfs_current());
- current->fs = fs;
- ll_set_fs_pwd(current->fs, init_task.fs->pwdmnt, init_task.fs->pwd);
-}
-
static void
ptlrpc_check_rqbd_pool(struct ptlrpc_service *svc)
{
struct ptlrpc_thread *thread = data->thread;
struct obd_device *dev = data->dev;
struct ptlrpc_reply_state *rs;
- struct lc_watchdog *watchdog;
#ifdef WITH_GROUP_INFO
struct group_info *ginfo = NULL;
#endif
struct lu_env env;
- int rc = 0;
+ int counter = 0, rc = 0;
ENTRY;
- ptlrpc_daemonize(data->name);
+ 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
goto out;
}
- rc = lu_context_init(&env.le_ctx, svc->srv_ctx_tags);
+ 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);
goto out_srv_fini;
}
- /* Record that the thread is running */
- thread->t_flags = SVC_RUNNING;
+ 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);
+
/*
* 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);
- watchdog = lc_watchdog_add(svc->srv_watchdog_timeout, NULL, NULL);
+ thread->t_watchdog = lc_watchdog_add(GET_TIMEOUT(svc), NULL, NULL);
spin_lock(&svc->srv_lock);
svc->srv_threads_running++;
spin_unlock(&svc->srv_lock);
cfs_waitq_signal(&svc->srv_free_rs_waitq);
- CDEBUG(D_NET, "service thread %d (#%d)started\n", thread->t_id,
- svc->srv_threads_running);
+ 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(watchdog);
+ 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_threads_running - 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);
- lc_watchdog_touch(watchdog);
+ 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))){
+ 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);
+
+ 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 (!list_empty (&svc->srv_reply_queue))
- ptlrpc_server_handle_reply (svc);
+ if (svc->srv_at_check)
+ ptlrpc_at_check_timed(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_threads_running - 1))) {
+ /* 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);
}
}
- lc_watchdog_delete(watchdog);
+ lc_watchdog_delete(thread->t_watchdog);
+ thread->t_watchdog = NULL;
out_srv_fini:
/*
lu_context_fini(&env.le_ctx);
out:
- CDEBUG(D_NET, "service thread %d exiting: rc %d\n", thread->t_id, rc);
+ 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 */
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);
+
+ 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 };
+ ENTRY;
+
+ CDEBUG(D_RPCTRACE, "Stopping thread [ %p : %u ]\n",
+ thread, thread->t_pid);
spin_lock(&svc->srv_lock);
- thread->t_flags = SVC_STOPPING;
+ /* let the thread know that we would like it to stop asap */
+ thread->t_flags |= SVC_STOPPING;
spin_unlock(&svc->srv_lock);
cfs_waitq_broadcast(&svc->srv_waitq);
- l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED),
- &lwi);
+ 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(&svc->srv_lock);
OBD_FREE_PTR(thread);
+ EXIT;
}
void ptlrpc_stop_all_threads(struct ptlrpc_service *svc)
{
struct ptlrpc_thread *thread;
+ ENTRY;
spin_lock(&svc->srv_lock);
while (!list_empty(&svc->srv_threads)) {
}
spin_unlock(&svc->srv_lock);
+ EXIT;
}
int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc)
int i, rc = 0;
ENTRY;
- LASSERT(svc->srv_threads_min > 0);
+ /* 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",
+ CERROR("cannot start %s thread #%d: rc %d\n",
svc->srv_thread_name, i, rc);
ptlrpc_stop_all_threads(svc);
+ break;
}
}
RETURN(rc);
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 (svc->srv_threads_started >= svc->srv_threads_max)
+
+ 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);
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.thread = thread;
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.
+
+ /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
+ * just drop the VM and FILES in cfs_daemonize_ctxt() right away.
*/
rc = cfs_kernel_thread(ptlrpc_main, &d, CLONE_VM | CLONE_FILES);
if (rc < 0) {
rc = (thread->t_flags & SVC_STOPPED) ? thread->t_id : 0;
RETURN(rc);
}
-#endif
+
+
+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);
+ }
+}
int ptlrpc_unregister_service(struct ptlrpc_service *service)
{
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));
/* Network access will complete in finite time but the HUGE
* timeout lets us CWARN for visibility of sluggish NALs */
- lwi = LWI_TIMEOUT(cfs_time_seconds(300), NULL, NULL);
+ 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);
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(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);
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(cfs_time_seconds(10), NULL, NULL);
-
- rc = l_wait_event(service->srv_waitq,
- !list_empty(&service->srv_reply_queue), &lwi);
- LASSERT(rc == 0 || rc == -ETIMEDOUT);
-
- if (rc == 0) {
- ptlrpc_server_handle_reply(service);
- continue;
- }
- CWARN("Unexpectedly long timeout %p\n", service);
- }
+ ptlrpc_wait_replies(service);
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);
}
+ /* 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;
+ RETURN(0);
}
/* Returns 0 if the service is healthy.
{
struct ptlrpc_request *request;
struct timeval right_now;
- long timediff, cutoff;
- int rc = 0;
+ 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))
- goto out;
-
- request = list_entry(svc->srv_request_queue.next,
- struct ptlrpc_request, rq_list);
-
- do_gettimeofday(&right_now);
+ 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);
- cutoff = obd_health_check_timeout;
-
- if (timediff / 1000000 > cutoff) {
- rc = -1;
- goto out;
+ 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);
}
- out:
- spin_unlock(&svc->srv_lock);
- return rc;
+ return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff