4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
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14 * included in the COPYING file that accompanied this code.
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18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Copyright (c) 2013, 2016, Intel Corporation.
25 * Copyright 2012 Xyratex Technology Limited
28 * lustre/ptlrpc/nrs_crr.c
30 * Network Request Scheduler (NRS) CRR-N policy
32 * Request ordering in a batched Round-Robin manner over client NIDs
34 * Author: Liang Zhen <liang@whamcloud.com>
35 * Author: Nikitas Angelinas <nikitas_angelinas@xyratex.com>
41 #ifdef HAVE_SERVER_SUPPORT
43 #define DEBUG_SUBSYSTEM S_RPC
44 #include <obd_support.h>
45 #include <obd_class.h>
46 #include <lustre_net.h>
47 #include <lprocfs_status.h>
48 #include "ptlrpc_internal.h"
53 * Client Round-Robin scheduling over client NIDs
59 #define NRS_POL_NAME_CRRN "crrn"
62 * Binary heap predicate.
64 * Uses ptlrpc_nrs_request::nr_u::crr::cr_round and
65 * ptlrpc_nrs_request::nr_u::crr::cr_sequence to compare two binheap nodes and
66 * produce a binary predicate that shows their relative priority, so that the
67 * binary heap can perform the necessary sorting operations.
69 * \param[in] e1 the first binheap node to compare
70 * \param[in] e2 the second binheap node to compare
76 crrn_req_compare(struct cfs_binheap_node *e1, struct cfs_binheap_node *e2)
78 struct ptlrpc_nrs_request *nrq1;
79 struct ptlrpc_nrs_request *nrq2;
81 nrq1 = container_of(e1, struct ptlrpc_nrs_request, nr_node);
82 nrq2 = container_of(e2, struct ptlrpc_nrs_request, nr_node);
84 if (nrq1->nr_u.crr.cr_round < nrq2->nr_u.crr.cr_round)
86 else if (nrq1->nr_u.crr.cr_round > nrq2->nr_u.crr.cr_round)
89 return nrq1->nr_u.crr.cr_sequence < nrq2->nr_u.crr.cr_sequence;
92 static struct cfs_binheap_ops nrs_crrn_heap_ops = {
95 .hop_compare = crrn_req_compare,
99 * libcfs_hash operations for nrs_crrn_net::cn_cli_hash
101 * This uses ptlrpc_request::rq_peer.nid as its key, in order to hash
102 * nrs_crrn_client objects.
104 #define NRS_NID_BKT_BITS 8
105 #define NRS_NID_BITS 16
107 static unsigned nrs_crrn_hop_hash(struct cfs_hash *hs, const void *key,
110 return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
113 static int nrs_crrn_hop_keycmp(const void *key, struct hlist_node *hnode)
115 lnet_nid_t *nid = (lnet_nid_t *)key;
116 struct nrs_crrn_client *cli = hlist_entry(hnode,
117 struct nrs_crrn_client,
119 return *nid == cli->cc_nid;
122 static void *nrs_crrn_hop_key(struct hlist_node *hnode)
124 struct nrs_crrn_client *cli = hlist_entry(hnode,
125 struct nrs_crrn_client,
130 static void *nrs_crrn_hop_object(struct hlist_node *hnode)
132 return hlist_entry(hnode, struct nrs_crrn_client, cc_hnode);
135 static void nrs_crrn_hop_get(struct cfs_hash *hs, struct hlist_node *hnode)
137 struct nrs_crrn_client *cli = hlist_entry(hnode,
138 struct nrs_crrn_client,
140 atomic_inc(&cli->cc_ref);
143 static void nrs_crrn_hop_put(struct cfs_hash *hs, struct hlist_node *hnode)
145 struct nrs_crrn_client *cli = hlist_entry(hnode,
146 struct nrs_crrn_client,
148 atomic_dec(&cli->cc_ref);
151 static void nrs_crrn_hop_exit(struct cfs_hash *hs, struct hlist_node *hnode)
153 struct nrs_crrn_client *cli = hlist_entry(hnode,
154 struct nrs_crrn_client,
156 LASSERTF(atomic_read(&cli->cc_ref) == 0,
157 "Busy CRR-N object from client with NID %s, with %d refs\n",
158 libcfs_nid2str(cli->cc_nid), atomic_read(&cli->cc_ref));
163 static struct cfs_hash_ops nrs_crrn_hash_ops = {
164 .hs_hash = nrs_crrn_hop_hash,
165 .hs_keycmp = nrs_crrn_hop_keycmp,
166 .hs_key = nrs_crrn_hop_key,
167 .hs_object = nrs_crrn_hop_object,
168 .hs_get = nrs_crrn_hop_get,
169 .hs_put = nrs_crrn_hop_put,
170 .hs_put_locked = nrs_crrn_hop_put,
171 .hs_exit = nrs_crrn_hop_exit,
175 * Called when a CRR-N policy instance is started.
177 * \param[in] policy the policy
179 * \retval -ENOMEM OOM error
182 static int nrs_crrn_start(struct ptlrpc_nrs_policy *policy, char *arg)
184 struct nrs_crrn_net *net;
188 OBD_CPT_ALLOC_PTR(net, nrs_pol2cptab(policy), nrs_pol2cptid(policy));
192 net->cn_binheap = cfs_binheap_create(&nrs_crrn_heap_ops,
193 CBH_FLAG_ATOMIC_GROW, 4096, NULL,
194 nrs_pol2cptab(policy),
195 nrs_pol2cptid(policy));
196 if (net->cn_binheap == NULL)
197 GOTO(failed, rc = -ENOMEM);
199 net->cn_cli_hash = cfs_hash_create("nrs_crrn_nid_hash",
200 NRS_NID_BITS, NRS_NID_BITS,
205 CFS_HASH_RW_BKTLOCK);
206 if (net->cn_cli_hash == NULL)
207 GOTO(failed, rc = -ENOMEM);
210 * Set default quantum value to max_rpcs_in_flight for non-MDS OSCs;
211 * there may be more RPCs pending from each struct nrs_crrn_client even
212 * with the default max_rpcs_in_flight value, as we are scheduling over
213 * NIDs, and there may be more than one mount point per client.
215 net->cn_quantum = OBD_MAX_RIF_DEFAULT;
217 * Set to 1 so that the test inside nrs_crrn_req_add() can evaluate to
220 net->cn_sequence = 1;
222 policy->pol_private = net;
227 if (net->cn_binheap != NULL)
228 cfs_binheap_destroy(net->cn_binheap);
236 * Called when a CRR-N policy instance is stopped.
238 * Called when the policy has been instructed to transition to the
239 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED state and has no more pending
242 * \param[in] policy the policy
244 static void nrs_crrn_stop(struct ptlrpc_nrs_policy *policy)
246 struct nrs_crrn_net *net = policy->pol_private;
249 LASSERT(net != NULL);
250 LASSERT(net->cn_binheap != NULL);
251 LASSERT(net->cn_cli_hash != NULL);
252 LASSERT(cfs_binheap_is_empty(net->cn_binheap));
254 cfs_binheap_destroy(net->cn_binheap);
255 cfs_hash_putref(net->cn_cli_hash);
261 * Performs a policy-specific ctl function on CRR-N policy instances; similar
264 * \param[in] policy the policy instance
265 * \param[in] opc the opcode
266 * \param[in,out] arg used for passing parameters and information
268 * \pre assert_spin_locked(&policy->pol_nrs->->nrs_lock)
269 * \post assert_spin_locked(&policy->pol_nrs->->nrs_lock)
271 * \retval 0 operation carried out successfully
274 static int nrs_crrn_ctl(struct ptlrpc_nrs_policy *policy,
275 enum ptlrpc_nrs_ctl opc,
278 assert_spin_locked(&policy->pol_nrs->nrs_lock);
280 switch((enum nrs_ctl_crr)opc) {
285 * Read Round Robin quantum size of a policy instance.
287 case NRS_CTL_CRRN_RD_QUANTUM: {
288 struct nrs_crrn_net *net = policy->pol_private;
290 *(__u16 *)arg = net->cn_quantum;
295 * Write Round Robin quantum size of a policy instance.
297 case NRS_CTL_CRRN_WR_QUANTUM: {
298 struct nrs_crrn_net *net = policy->pol_private;
300 net->cn_quantum = *(__u16 *)arg;
301 LASSERT(net->cn_quantum != 0);
310 * Obtains resources from CRR-N policy instances. The top-level resource lives
311 * inside \e nrs_crrn_net and the second-level resource inside
312 * \e nrs_crrn_client object instances.
314 * \param[in] policy the policy for which resources are being taken for
316 * \param[in] nrq the request for which resources are being taken
317 * \param[in] parent parent resource, embedded in nrs_crrn_net for the
319 * \param[out] resp resources references are placed in this array
320 * \param[in] moving_req signifies limited caller context; used to perform
321 * memory allocations in an atomic context in this
324 * \retval 0 we are returning a top-level, parent resource, one that is
325 * embedded in an nrs_crrn_net object
326 * \retval 1 we are returning a bottom-level resource, one that is embedded
327 * in an nrs_crrn_client object
329 * \see nrs_resource_get_safe()
331 static int nrs_crrn_res_get(struct ptlrpc_nrs_policy *policy,
332 struct ptlrpc_nrs_request *nrq,
333 const struct ptlrpc_nrs_resource *parent,
334 struct ptlrpc_nrs_resource **resp, bool moving_req)
336 struct nrs_crrn_net *net;
337 struct nrs_crrn_client *cli;
338 struct nrs_crrn_client *tmp;
339 struct ptlrpc_request *req;
341 if (parent == NULL) {
342 *resp = &((struct nrs_crrn_net *)policy->pol_private)->cn_res;
346 net = container_of(parent, struct nrs_crrn_net, cn_res);
347 req = container_of(nrq, struct ptlrpc_request, rq_nrq);
349 cli = cfs_hash_lookup(net->cn_cli_hash, &req->rq_peer.nid);
353 OBD_CPT_ALLOC_GFP(cli, nrs_pol2cptab(policy), nrs_pol2cptid(policy),
354 sizeof(*cli), moving_req ? GFP_ATOMIC : GFP_NOFS);
358 cli->cc_nid = req->rq_peer.nid;
360 atomic_set(&cli->cc_ref, 1);
361 tmp = cfs_hash_findadd_unique(net->cn_cli_hash, &cli->cc_nid,
368 *resp = &cli->cc_res;
374 * Called when releasing references to the resource hierachy obtained for a
375 * request for scheduling using the CRR-N policy.
377 * \param[in] policy the policy the resource belongs to
378 * \param[in] res the resource to be released
380 static void nrs_crrn_res_put(struct ptlrpc_nrs_policy *policy,
381 const struct ptlrpc_nrs_resource *res)
383 struct nrs_crrn_net *net;
384 struct nrs_crrn_client *cli;
387 * Do nothing for freeing parent, nrs_crrn_net resources
389 if (res->res_parent == NULL)
392 cli = container_of(res, struct nrs_crrn_client, cc_res);
393 net = container_of(res->res_parent, struct nrs_crrn_net, cn_res);
395 cfs_hash_put(net->cn_cli_hash, &cli->cc_hnode);
399 * Called when getting a request from the CRR-N policy for handlingso that it can be served
401 * \param[in] policy the policy being polled
402 * \param[in] peek when set, signifies that we just want to examine the
403 * request, and not handle it, so the request is not removed
405 * \param[in] force force the policy to return a request; unused in this policy
407 * \retval the request to be handled
408 * \retval NULL no request available
410 * \see ptlrpc_nrs_req_get_nolock()
411 * \see nrs_request_get()
414 struct ptlrpc_nrs_request *nrs_crrn_req_get(struct ptlrpc_nrs_policy *policy,
415 bool peek, bool force)
417 struct nrs_crrn_net *net = policy->pol_private;
418 struct cfs_binheap_node *node = cfs_binheap_root(net->cn_binheap);
419 struct ptlrpc_nrs_request *nrq;
421 nrq = unlikely(node == NULL) ? NULL :
422 container_of(node, struct ptlrpc_nrs_request, nr_node);
424 if (likely(!peek && nrq != NULL)) {
425 struct nrs_crrn_client *cli;
426 struct ptlrpc_request *req = container_of(nrq,
427 struct ptlrpc_request,
430 cli = container_of(nrs_request_resource(nrq),
431 struct nrs_crrn_client, cc_res);
433 LASSERT(nrq->nr_u.crr.cr_round <= cli->cc_round);
435 cfs_binheap_remove(net->cn_binheap, &nrq->nr_node);
439 "NRS: starting to handle %s request from %s, with round "
440 "%llu\n", NRS_POL_NAME_CRRN,
441 libcfs_id2str(req->rq_peer), nrq->nr_u.crr.cr_round);
443 /** Peek at the next request to be served */
444 node = cfs_binheap_root(net->cn_binheap);
446 /** No more requests */
447 if (unlikely(node == NULL)) {
450 struct ptlrpc_nrs_request *next;
452 next = container_of(node, struct ptlrpc_nrs_request,
455 if (net->cn_round < next->nr_u.crr.cr_round)
456 net->cn_round = next->nr_u.crr.cr_round;
464 * Adds request \a nrq to a CRR-N \a policy instance's set of queued requests
466 * A scheduling round is a stream of requests that have been sorted in batches
467 * according to the client that they originate from (as identified by its NID);
468 * there can be only one batch for each client in each round. The batches are of
469 * maximum size nrs_crrn_net:cn_quantum. When a new request arrives for
470 * scheduling from a client that has exhausted its quantum in its current round,
471 * it will start scheduling requests on the next scheduling round. Clients are
472 * allowed to schedule requests against a round until all requests for the round
473 * are serviced, so a client might miss a round if it is not generating requests
474 * for a long enough period of time. Clients that miss a round will continue
475 * with scheduling the next request that they generate, starting at the round
476 * that requests are being dispatched for, at the time of arrival of this new
479 * Requests are tagged with the round number and a sequence number; the sequence
480 * number indicates the relative ordering amongst the batches of requests in a
481 * round, and is identical for all requests in a batch, as is the round number.
482 * The round and sequence numbers are used by crrn_req_compare() in order to
483 * maintain an ordered set of rounds, with each round consisting of an ordered
484 * set of batches of requests.
486 * \param[in] policy the policy
487 * \param[in] nrq the request to add
489 * \retval 0 request successfully added
492 static int nrs_crrn_req_add(struct ptlrpc_nrs_policy *policy,
493 struct ptlrpc_nrs_request *nrq)
495 struct nrs_crrn_net *net;
496 struct nrs_crrn_client *cli;
499 cli = container_of(nrs_request_resource(nrq),
500 struct nrs_crrn_client, cc_res);
501 net = container_of(nrs_request_resource(nrq)->res_parent,
502 struct nrs_crrn_net, cn_res);
504 if (cli->cc_quantum == 0 || cli->cc_round < net->cn_round ||
505 (cli->cc_active == 0 && cli->cc_quantum > 0)) {
508 * If the client has no pending requests, and still some of its
509 * quantum remaining unused, which implies it has not had a
510 * chance to schedule up to its maximum allowed batch size of
511 * requests in the previous round it participated, schedule this
512 * next request on a new round; this avoids fragmentation of
513 * request batches caused by client inactivity, at the expense
514 * of potentially slightly increased service time for the
515 * request batch this request will be a part of.
517 if (cli->cc_active == 0 && cli->cc_quantum > 0)
520 /** A new scheduling round has commenced */
521 if (cli->cc_round < net->cn_round)
522 cli->cc_round = net->cn_round;
524 /** I was not the last client through here */
525 if (cli->cc_sequence < net->cn_sequence)
526 cli->cc_sequence = ++net->cn_sequence;
528 * Reset the quantum if we have reached the maximum quantum
529 * size for this batch, or even if we have not managed to
530 * complete a batch size up to its maximum allowed size.
531 * XXX: Accessed unlocked
533 cli->cc_quantum = net->cn_quantum;
536 nrq->nr_u.crr.cr_round = cli->cc_round;
537 nrq->nr_u.crr.cr_sequence = cli->cc_sequence;
539 rc = cfs_binheap_insert(net->cn_binheap, &nrq->nr_node);
542 if (--cli->cc_quantum == 0)
549 * Removes request \a nrq from a CRR-N \a policy instance's set of queued
552 * \param[in] policy the policy
553 * \param[in] nrq the request to remove
555 static void nrs_crrn_req_del(struct ptlrpc_nrs_policy *policy,
556 struct ptlrpc_nrs_request *nrq)
558 struct nrs_crrn_net *net;
559 struct nrs_crrn_client *cli;
562 cli = container_of(nrs_request_resource(nrq),
563 struct nrs_crrn_client, cc_res);
564 net = container_of(nrs_request_resource(nrq)->res_parent,
565 struct nrs_crrn_net, cn_res);
567 LASSERT(nrq->nr_u.crr.cr_round <= cli->cc_round);
569 is_root = &nrq->nr_node == cfs_binheap_root(net->cn_binheap);
571 cfs_binheap_remove(net->cn_binheap, &nrq->nr_node);
575 * If we just deleted the node at the root of the binheap, we may have
576 * to adjust round numbers.
578 if (unlikely(is_root)) {
579 /** Peek at the next request to be served */
580 struct cfs_binheap_node *node = cfs_binheap_root(net->cn_binheap);
582 /** No more requests */
583 if (unlikely(node == NULL)) {
586 nrq = container_of(node, struct ptlrpc_nrs_request,
589 if (net->cn_round < nrq->nr_u.crr.cr_round)
590 net->cn_round = nrq->nr_u.crr.cr_round;
596 * Called right after the request \a nrq finishes being handled by CRR-N policy
597 * instance \a policy.
599 * \param[in] policy the policy that handled the request
600 * \param[in] nrq the request that was handled
602 static void nrs_crrn_req_stop(struct ptlrpc_nrs_policy *policy,
603 struct ptlrpc_nrs_request *nrq)
605 struct ptlrpc_request *req = container_of(nrq, struct ptlrpc_request,
609 "NRS: finished handling %s request from %s, with round %llu"
610 "\n", NRS_POL_NAME_CRRN,
611 libcfs_id2str(req->rq_peer), nrq->nr_u.crr.cr_round);
614 #ifdef CONFIG_PROC_FS
621 * Retrieves the value of the Round Robin quantum (i.e. the maximum batch size)
622 * for CRR-N policy instances on both the regular and high-priority NRS head
623 * of a service, as long as a policy instance is not in the
624 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED state; policy instances in this
625 * state are skipped later by nrs_crrn_ctl().
627 * Quantum values are in # of RPCs, and output is in YAML format.
635 ptlrpc_lprocfs_nrs_crrn_quantum_seq_show(struct seq_file *m, void *data)
637 struct ptlrpc_service *svc = m->private;
642 * Perform two separate calls to this as only one of the NRS heads'
643 * policies may be in the ptlrpc_nrs_pol_state::NRS_POL_STATE_STARTED or
644 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPING state.
646 rc = ptlrpc_nrs_policy_control(svc, PTLRPC_NRS_QUEUE_REG,
648 NRS_CTL_CRRN_RD_QUANTUM,
651 seq_printf(m, NRS_LPROCFS_QUANTUM_NAME_REG
654 * Ignore -ENODEV as the regular NRS head's policy may be in the
655 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED state.
657 } else if (rc != -ENODEV) {
661 if (!nrs_svc_has_hp(svc))
664 rc = ptlrpc_nrs_policy_control(svc, PTLRPC_NRS_QUEUE_HP,
666 NRS_CTL_CRRN_RD_QUANTUM,
669 seq_printf(m, NRS_LPROCFS_QUANTUM_NAME_HP"%-5d\n", quantum);
671 * Ignore -ENODEV as the high priority NRS head's policy may be
672 * in the ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED state.
674 } else if (rc != -ENODEV) {
683 * Sets the value of the Round Robin quantum (i.e. the maximum batch size)
684 * for CRR-N policy instances of a service. The user can set the quantum size
685 * for the regular or high priority NRS head individually by specifying each
686 * value, or both together in a single invocation.
690 * lctl set_param *.*.*.nrs_crrn_quantum=reg_quantum:32, to set the regular
691 * request quantum size on all PTLRPC services to 32
693 * lctl set_param *.*.*.nrs_crrn_quantum=hp_quantum:16, to set the high
694 * priority request quantum size on all PTLRPC services to 16, and
696 * lctl set_param *.*.ost_io.nrs_crrn_quantum=16, to set both the regular and
697 * high priority request quantum sizes of the ost_io service to 16.
699 * policy instances in the ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED state
700 * are skipped later by nrs_crrn_ctl().
703 ptlrpc_lprocfs_nrs_crrn_quantum_seq_write(struct file *file,
704 const char __user *buffer,
708 struct ptlrpc_service *svc = ((struct seq_file *)file->private_data)->private;
709 enum ptlrpc_nrs_queue_type queue = 0;
710 char kernbuf[LPROCFS_NRS_WR_QUANTUM_MAX_CMD];
714 /** lprocfs_find_named_value() modifies its argument, so keep a copy */
719 if (count > (sizeof(kernbuf) - 1))
722 if (copy_from_user(kernbuf, buffer, count))
725 kernbuf[count] = '\0';
730 * Check if the regular quantum value has been specified
732 val = lprocfs_find_named_value(kernbuf, NRS_LPROCFS_QUANTUM_NAME_REG,
734 if (val != kernbuf) {
735 quantum_reg = simple_strtol(val, NULL, 10);
737 queue |= PTLRPC_NRS_QUEUE_REG;
743 * Check if the high priority quantum value has been specified
745 val = lprocfs_find_named_value(kernbuf, NRS_LPROCFS_QUANTUM_NAME_HP,
747 if (val != kernbuf) {
748 if (!nrs_svc_has_hp(svc))
751 quantum_hp = simple_strtol(val, NULL, 10);
753 queue |= PTLRPC_NRS_QUEUE_HP;
757 * If none of the queues has been specified, look for a valid numerical
761 if (!isdigit(kernbuf[0]))
764 quantum_reg = simple_strtol(kernbuf, NULL, 10);
766 queue = PTLRPC_NRS_QUEUE_REG;
768 if (nrs_svc_has_hp(svc)) {
769 queue |= PTLRPC_NRS_QUEUE_HP;
770 quantum_hp = quantum_reg;
774 if ((((queue & PTLRPC_NRS_QUEUE_REG) != 0) &&
775 ((quantum_reg > LPROCFS_NRS_QUANTUM_MAX || quantum_reg <= 0))) ||
776 (((queue & PTLRPC_NRS_QUEUE_HP) != 0) &&
777 ((quantum_hp > LPROCFS_NRS_QUANTUM_MAX || quantum_hp <= 0))))
781 * We change the values on regular and HP NRS heads separately, so that
782 * we do not exit early from ptlrpc_nrs_policy_control() with an error
783 * returned by nrs_policy_ctl_locked(), in cases where the user has not
784 * started the policy on either the regular or HP NRS head; i.e. we are
785 * ignoring -ENODEV within nrs_policy_ctl_locked(). -ENODEV is returned
786 * only if the operation fails with -ENODEV on all heads that have been
787 * specified by the command; if at least one operation succeeds,
788 * success is returned.
790 if ((queue & PTLRPC_NRS_QUEUE_REG) != 0) {
791 rc = ptlrpc_nrs_policy_control(svc, PTLRPC_NRS_QUEUE_REG,
793 NRS_CTL_CRRN_WR_QUANTUM, false,
795 if ((rc < 0 && rc != -ENODEV) ||
796 (rc == -ENODEV && queue == PTLRPC_NRS_QUEUE_REG))
800 if ((queue & PTLRPC_NRS_QUEUE_HP) != 0) {
801 rc2 = ptlrpc_nrs_policy_control(svc, PTLRPC_NRS_QUEUE_HP,
803 NRS_CTL_CRRN_WR_QUANTUM, false,
805 if ((rc2 < 0 && rc2 != -ENODEV) ||
806 (rc2 == -ENODEV && queue == PTLRPC_NRS_QUEUE_HP))
810 return rc == -ENODEV && rc2 == -ENODEV ? -ENODEV : count;
812 LPROC_SEQ_FOPS(ptlrpc_lprocfs_nrs_crrn_quantum);
815 * Initializes a CRR-N policy's lprocfs interface for service \a svc
817 * \param[in] svc the service
822 static int nrs_crrn_lprocfs_init(struct ptlrpc_service *svc)
824 struct lprocfs_vars nrs_crrn_lprocfs_vars[] = {
825 { .name = "nrs_crrn_quantum",
826 .fops = &ptlrpc_lprocfs_nrs_crrn_quantum_fops,
831 if (svc->srv_procroot == NULL)
834 return lprocfs_add_vars(svc->srv_procroot, nrs_crrn_lprocfs_vars, NULL);
838 * Cleans up a CRR-N policy's lprocfs interface for service \a svc
840 * \param[in] svc the service
842 static void nrs_crrn_lprocfs_fini(struct ptlrpc_service *svc)
844 if (svc->srv_procroot == NULL)
847 lprocfs_remove_proc_entry("nrs_crrn_quantum", svc->srv_procroot);
850 #endif /* CONFIG_PROC_FS */
853 * CRR-N policy operations
855 static const struct ptlrpc_nrs_pol_ops nrs_crrn_ops = {
856 .op_policy_start = nrs_crrn_start,
857 .op_policy_stop = nrs_crrn_stop,
858 .op_policy_ctl = nrs_crrn_ctl,
859 .op_res_get = nrs_crrn_res_get,
860 .op_res_put = nrs_crrn_res_put,
861 .op_req_get = nrs_crrn_req_get,
862 .op_req_enqueue = nrs_crrn_req_add,
863 .op_req_dequeue = nrs_crrn_req_del,
864 .op_req_stop = nrs_crrn_req_stop,
865 #ifdef CONFIG_PROC_FS
866 .op_lprocfs_init = nrs_crrn_lprocfs_init,
867 .op_lprocfs_fini = nrs_crrn_lprocfs_fini,
872 * CRR-N policy configuration
874 struct ptlrpc_nrs_pol_conf nrs_conf_crrn = {
875 .nc_name = NRS_POL_NAME_CRRN,
876 .nc_ops = &nrs_crrn_ops,
877 .nc_compat = nrs_policy_compat_all,
880 /** @} CRR-N policy */
884 #endif /* HAVE_SERVER_SUPPORT */