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staging: lustre: osc: Performance tune for LRU 

Early launch page LRU work in osc_io_rw_iter_init();
Change the page LRU shrinking policy by OSC attributes;
Delete the contented lock osc_object::oo_seatbelt

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5108
Reviewed-on: http://review.whamcloud.com/10458
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jinshan Xiong 2016-12-01 17:35:32 -05:00 committed by Greg Kroah-Hartman
parent aed71a15bb
commit 17037fbd56
9 changed files with 106 additions and 100 deletions
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8
drivers/staging/lustre/lustre/include/obd.h
View File

@ -267,6 +267,14 @@ struct client_obd {
* allowed to have multiple threads shrinking LRU cache.
*/
atomic_t cl_lru_shrinkers;
/** The time when this LRU cache was last used. */
time64_t cl_lru_last_used;
/** stats: how many reclaims have happened for this client_obd.
* reclaim and shrink - shrink is async, voluntarily rebalancing;
* reclaim is sync, initiated by IO thread when the LRU slots are
* in shortage.
*/
u64 cl_lru_reclaim;
/** List of LRU pages for this client_obd */
struct list_head cl_lru_list;
/** Lock for LRU page list */

6
drivers/staging/lustre/lustre/osc/lproc_osc.c
View File

@ -183,10 +183,12 @@ static int osc_cached_mb_seq_show(struct seq_file *m, void *v)
seq_printf(m,
"used_mb: %ld\n"
"busy_cnt: %ld\n",
"busy_cnt: %ld\n"
"reclaim: %llu\n",
(atomic_long_read(&cli->cl_lru_in_list) +
atomic_long_read(&cli->cl_lru_busy)) >> shift,
atomic_long_read(&cli->cl_lru_busy));
atomic_long_read(&cli->cl_lru_busy),
cli->cl_lru_reclaim);
return 0;
}

24
drivers/staging/lustre/lustre/osc/osc_cache.c
View File

@ -1329,7 +1329,6 @@ static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
{
struct osc_page *opg = oap2osc_page(oap);
struct cl_page *page = oap2cl_page(oap);
struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
enum cl_req_type crt;
int srvlock;
@ -1344,13 +1343,6 @@ static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
/* Clear opg->ops_transfer_pinned before VM lock is released. */
opg->ops_transfer_pinned = 0;
spin_lock(&obj->oo_seatbelt);
LASSERT(opg->ops_submitter);
LASSERT(!list_empty(&opg->ops_inflight));
list_del_init(&opg->ops_inflight);
opg->ops_submitter = NULL;
spin_unlock(&obj->oo_seatbelt);
opg->ops_submit_time = 0;
srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
@ -1381,7 +1373,7 @@ static int osc_completion(const struct lu_env *env, struct osc_async_page *oap,
#define OSC_DUMP_GRANT(lvl, cli, fmt, args...) do { \
struct client_obd *__tmp = (cli); \
CDEBUG(lvl, "%s: grant { dirty: %ld/%ld dirty_pages: %ld/%lu " \
CDEBUG(lvl, "%s: grant { dirty: %lu/%lu dirty_pages: %ld/%lu " \
"dropped: %ld avail: %ld, reserved: %ld, flight: %d }" \
"lru {in list: %ld, left: %ld, waiters: %d }" fmt "\n", \
cli_name(__tmp), \
@ -2246,14 +2238,9 @@ static int osc_io_unplug0(const struct lu_env *env, struct client_obd *cli,
return 0;
if (!async) {
/* disable osc_lru_shrink() temporarily to avoid
* potential stack overrun problem. LU-2859
*/
atomic_inc(&cli->cl_lru_shrinkers);
spin_lock(&cli->cl_loi_list_lock);
osc_check_rpcs(env, cli);
spin_unlock(&cli->cl_loi_list_lock);
atomic_dec(&cli->cl_lru_shrinkers);
} else {
CDEBUG(D_CACHE, "Queue writeback work for client %p.\n", cli);
LASSERT(cli->cl_writeback_work);
@ -2475,7 +2462,6 @@ int osc_teardown_async_page(const struct lu_env *env,
struct osc_object *obj, struct osc_page *ops)
{
struct osc_async_page *oap = &ops->ops_oap;
struct osc_extent *ext = NULL;
int rc = 0;
LASSERT(oap->oap_magic == OAP_MAGIC);
@ -2483,12 +2469,15 @@ int osc_teardown_async_page(const struct lu_env *env,
CDEBUG(D_INFO, "teardown oap %p page %p at index %lu.\n",
oap, ops, osc_index(oap2osc(oap)));
osc_object_lock(obj);
if (!list_empty(&oap->oap_rpc_item)) {
CDEBUG(D_CACHE, "oap %p is not in cache.\n", oap);
rc = -EBUSY;
} else if (!list_empty(&oap->oap_pending_item)) {
struct osc_extent *ext = NULL;
osc_object_lock(obj);
ext = osc_extent_lookup(obj, osc_index(oap2osc(oap)));
osc_object_unlock(obj);
/* only truncated pages are allowed to be taken out.
* See osc_extent_truncate() and osc_cache_truncate_start()
* for details.
@ -2498,10 +2487,9 @@ int osc_teardown_async_page(const struct lu_env *env,
osc_index(oap2osc(oap)));
rc = -EBUSY;
}
}
osc_object_unlock(obj);
if (ext)
osc_extent_put(env, ext);
}
return rc;
}

19
drivers/staging/lustre/lustre/osc/osc_cl_internal.h
View File

@ -119,16 +119,6 @@ struct osc_object {
*/
int oo_contended;
unsigned long oo_contention_time;
/**
* List of pages in transfer.
*/
struct list_head oo_inflight[CRT_NR];
/**
* Lock, protecting osc_page::ops_inflight, because a seat-belt is
* locked during take-off and landing.
*/
spinlock_t oo_seatbelt;
/**
* used by the osc to keep track of what objects to build into rpcs.
* Protected by client_obd->cli_loi_list_lock.
@ -356,15 +346,6 @@ struct osc_page {
* lru page list. See osc_lru_{del|use}() in osc_page.c for usage.
*/
struct list_head ops_lru;
/**
* Linkage into a per-osc_object list of pages in flight. For
* debugging.
*/
struct list_head ops_inflight;
/**
* Thread that submitted this page for transfer. For debugging.
*/
struct task_struct *ops_submitter;
/**
* Submit time - the time when the page is starting RPC. For debugging.
*/

2
drivers/staging/lustre/lustre/osc/osc_internal.h
View File

@ -133,7 +133,7 @@ int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
struct list_head *ext_list, int cmd);
long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
long target, bool force);
long osc_lru_reclaim(struct client_obd *cli);
long osc_lru_reclaim(struct client_obd *cli, unsigned long npages);
unsigned long osc_ldlm_weigh_ast(struct ldlm_lock *dlmlock);

13
drivers/staging/lustre/lustre/osc/osc_io.c
View File

@ -352,7 +352,7 @@ static int osc_io_rw_iter_init(const struct lu_env *env,
npages = max_pages;
c = atomic_long_read(cli->cl_lru_left);
if (c < npages && osc_lru_reclaim(cli) > 0)
if (c < npages && osc_lru_reclaim(cli, npages) > 0)
c = atomic_long_read(cli->cl_lru_left);
while (c >= npages) {
if (c == atomic_long_cmpxchg(cli->cl_lru_left, c, c - npages)) {
@ -361,6 +361,17 @@ static int osc_io_rw_iter_init(const struct lu_env *env,
}
c = atomic_long_read(cli->cl_lru_left);
}
if (atomic_long_read(cli->cl_lru_left) < max_pages) {
/*
* If there aren't enough pages in the per-OSC LRU then
* wake up the LRU thread to try and clear out space, so
* we don't block if pages are being dirtied quickly.
*/
CDEBUG(D_CACHE, "%s: queue LRU, left: %lu/%ld.\n",
cli_name(cli), atomic_long_read(cli->cl_lru_left),
max_pages);
(void)ptlrpcd_queue_work(cli->cl_lru_work);
}
return 0;
}

9
drivers/staging/lustre/lustre/osc/osc_object.c
View File

@ -71,13 +71,8 @@ static int osc_object_init(const struct lu_env *env, struct lu_object *obj,
{
struct osc_object *osc = lu2osc(obj);
const struct cl_object_conf *cconf = lu2cl_conf(conf);
int i;
osc->oo_oinfo = cconf->u.coc_oinfo;
spin_lock_init(&osc->oo_seatbelt);
for (i = 0; i < CRT_NR; ++i)
INIT_LIST_HEAD(&osc->oo_inflight[i]);
INIT_LIST_HEAD(&osc->oo_ready_item);
INIT_LIST_HEAD(&osc->oo_hp_ready_item);
INIT_LIST_HEAD(&osc->oo_write_item);
@ -103,10 +98,6 @@ static int osc_object_init(const struct lu_env *env, struct lu_object *obj,
static void osc_object_free(const struct lu_env *env, struct lu_object *obj)
{
struct osc_object *osc = lu2osc(obj);
int i;
for (i = 0; i < CRT_NR; ++i)
LASSERT(list_empty(&osc->oo_inflight[i]));
LASSERT(list_empty(&osc->oo_ready_item));
LASSERT(list_empty(&osc->oo_hp_ready_item));

119
drivers/staging/lustre/lustre/osc/osc_page.c
View File

@ -37,6 +37,7 @@
#define DEBUG_SUBSYSTEM S_OSC
#include <linux/math64.h>
#include "osc_cl_internal.h"
static void osc_lru_del(struct client_obd *cli, struct osc_page *opg);
@ -86,11 +87,6 @@ static void osc_page_transfer_add(const struct lu_env *env,
struct osc_object *obj = cl2osc(opg->ops_cl.cpl_obj);
osc_lru_use(osc_cli(obj), opg);
spin_lock(&obj->oo_seatbelt);
list_add(&opg->ops_inflight, &obj->oo_inflight[crt]);
opg->ops_submitter = current;
spin_unlock(&obj->oo_seatbelt);
}
int osc_page_cache_add(const struct lu_env *env,
@ -140,7 +136,7 @@ static int osc_page_print(const struct lu_env *env,
struct osc_object *obj = cl2osc(slice->cpl_obj);
struct client_obd *cli = &osc_export(obj)->exp_obd->u.cli;
return (*printer)(env, cookie, LUSTRE_OSC_NAME "-page@%p %lu: 1< %#x %d %u %s %s > 2< %llu %u %u %#x %#x | %p %p %p > 3< %s %p %d %lu %d > 4< %d %d %d %lu %s | %s %s %s %s > 5< %s %s %s %s | %d %s | %d %s %s>\n",
return (*printer)(env, cookie, LUSTRE_OSC_NAME "-page@%p %lu: 1< %#x %d %u %s %s > 2< %llu %u %u %#x %#x | %p %p %p > 3< %d %lu %d > 4< %d %d %d %lu %s | %s %s %s %s > 5< %s %s %s %s | %d %s | %d %s %s>\n",
opg, osc_index(opg),
/* 1 */
oap->oap_magic, oap->oap_cmd,
@ -152,8 +148,7 @@ static int osc_page_print(const struct lu_env *env,
oap->oap_async_flags, oap->oap_brw_flags,
oap->oap_request, oap->oap_cli, obj,
/* 3 */
osc_list(&opg->ops_inflight),
opg->ops_submitter, opg->ops_transfer_pinned,
opg->ops_transfer_pinned,
osc_submit_duration(opg), opg->ops_srvlock,
/* 4 */
cli->cl_r_in_flight, cli->cl_w_in_flight,
@ -192,14 +187,6 @@ static void osc_page_delete(const struct lu_env *env,
LASSERT(0);
}
spin_lock(&obj->oo_seatbelt);
if (opg->ops_submitter) {
LASSERT(!list_empty(&opg->ops_inflight));
list_del_init(&opg->ops_inflight);
opg->ops_submitter = NULL;
}
spin_unlock(&obj->oo_seatbelt);
osc_lru_del(osc_cli(obj), opg);
if (slice->cpl_page->cp_type == CPT_CACHEABLE) {
@ -282,10 +269,6 @@ int osc_page_init(const struct lu_env *env, struct cl_object *obj,
cl_page_slice_add(page, &opg->ops_cl, obj, index,
&osc_page_ops);
}
/* ops_inflight and ops_lru are the same field, but it doesn't
* hurt to initialize it twice :-)
*/
INIT_LIST_HEAD(&opg->ops_inflight);
INIT_LIST_HEAD(&opg->ops_lru);
/* reserve an LRU space for this page */
@ -349,8 +332,18 @@ static DECLARE_WAIT_QUEUE_HEAD(osc_lru_waitq);
* LRU pages are freed in batch mode. OSC should at least free this
* number of pages to avoid running out of LRU slots.
*/
static const int lru_shrink_min = 2 << (20 - PAGE_SHIFT); /* 2M */
static const int lru_shrink_max = 8 << (20 - PAGE_SHIFT); /* 8M */
static inline int lru_shrink_min(struct client_obd *cli)
{
return cli->cl_max_pages_per_rpc * 2;
}
/**
* free this number at most otherwise it will take too long time to finish.
*/
static inline int lru_shrink_max(struct client_obd *cli)
{
return cli->cl_max_pages_per_rpc * cli->cl_max_rpcs_in_flight;
}
/**
* Check if we can free LRU slots from this OSC. If there exists LRU waiters,
@ -370,13 +363,20 @@ static int osc_cache_too_much(struct client_obd *cli)
/* if it's going to run out LRU slots, we should free some, but not
* too much to maintain fairness among OSCs.
*/
if (atomic_long_read(cli->cl_lru_left) < cache->ccc_lru_max >> 4) {
if (atomic_long_read(cli->cl_lru_left) < cache->ccc_lru_max >> 2) {
if (pages >= budget)
return lru_shrink_max;
return lru_shrink_max(cli);
else if (pages >= budget / 2)
return lru_shrink_min;
} else if (pages >= budget * 2) {
return lru_shrink_min;
return lru_shrink_min(cli);
} else {
time64_t duration = ktime_get_real_seconds();
/* knock out pages by duration of no IO activity */
duration -= cli->cl_lru_last_used;
duration >>= 6; /* approximately 1 minute */
if (duration > 0 &&
pages >= div64_s64((s64)budget, duration))
return lru_shrink_min(cli);
}
return 0;
}
@ -384,11 +384,21 @@ static int osc_cache_too_much(struct client_obd *cli)
int lru_queue_work(const struct lu_env *env, void *data)
{
struct client_obd *cli = data;
int count;
CDEBUG(D_CACHE, "%s: run LRU work for client obd\n", cli_name(cli));
if (osc_cache_too_much(cli))
osc_lru_shrink(env, cli, lru_shrink_max, true);
count = osc_cache_too_much(cli);
if (count > 0) {
int rc = osc_lru_shrink(env, cli, count, false);
CDEBUG(D_CACHE, "%s: shrank %d/%d pages from client obd\n",
cli_name(cli), rc, count);
if (rc >= count) {
CDEBUG(D_CACHE, "%s: queue again\n", cli_name(cli));
ptlrpcd_queue_work(cli->cl_lru_work);
}
}
return 0;
}
@ -415,10 +425,10 @@ void osc_lru_add_batch(struct client_obd *cli, struct list_head *plist)
list_splice_tail(&lru, &cli->cl_lru_list);
atomic_long_sub(npages, &cli->cl_lru_busy);
atomic_long_add(npages, &cli->cl_lru_in_list);
cli->cl_lru_last_used = ktime_get_real_seconds();
spin_unlock(&cli->cl_lru_list_lock);
/* XXX: May set force to be true for better performance */
if (osc_cache_too_much(cli))
if (waitqueue_active(&osc_lru_waitq))
(void)ptlrpcd_queue_work(cli->cl_lru_work);
}
}
@ -451,8 +461,10 @@ static void osc_lru_del(struct client_obd *cli, struct osc_page *opg)
* this osc occupies too many LRU pages and kernel is
* stealing one of them.
*/
if (!memory_pressure_get())
if (osc_cache_too_much(cli)) {
CDEBUG(D_CACHE, "%s: queue LRU workn", cli_name(cli));
(void)ptlrpcd_queue_work(cli->cl_lru_work);
}
wake_up(&osc_lru_waitq);
} else {
LASSERT(list_empty(&opg->ops_lru));
@ -484,6 +496,7 @@ static void discard_pagevec(const struct lu_env *env, struct cl_io *io,
struct cl_page *page = pvec[i];
LASSERT(cl_page_is_owned(page, io));
cl_page_delete(env, page);
cl_page_discard(env, io, page);
cl_page_disown(env, io, page);
cl_page_put(env, page);
@ -534,6 +547,8 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
if (atomic_long_read(&cli->cl_lru_in_list) == 0 || target <= 0)
return 0;
CDEBUG(D_CACHE, "%s: shrinkers: %d, force: %d\n",
cli_name(cli), atomic_read(&cli->cl_lru_shrinkers), force);
if (!force) {
if (atomic_read(&cli->cl_lru_shrinkers) > 0)
return -EBUSY;
@ -550,11 +565,16 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
io = &osc_env_info(env)->oti_io;
spin_lock(&cli->cl_lru_list_lock);
if (force)
cli->cl_lru_reclaim++;
maxscan = min(target << 1, atomic_long_read(&cli->cl_lru_in_list));
list_for_each_entry_safe(opg, temp, &cli->cl_lru_list, ops_lru) {
struct cl_page *page;
bool will_free = false;
if (!force && atomic_read(&cli->cl_lru_shrinkers) > 1)
break;
if (--maxscan < 0)
break;
@ -650,7 +670,7 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
* LRU pages in batch. Therefore, the actual number is adjusted at least
* max_pages_per_rpc.
*/
long osc_lru_reclaim(struct client_obd *cli)
long osc_lru_reclaim(struct client_obd *cli, unsigned long npages)
{
struct lu_env *env;
struct cl_client_cache *cache = cli->cl_cache;
@ -664,19 +684,23 @@ long osc_lru_reclaim(struct client_obd *cli)
if (IS_ERR(env))
return 0;
rc = osc_lru_shrink(env, cli, osc_cache_too_much(cli), false);
if (rc != 0) {
if (rc == -EBUSY)
rc = 0;
CDEBUG(D_CACHE, "%s: Free %ld pages from own LRU: %p.\n",
cli->cl_import->imp_obd->obd_name, rc, cli);
npages = max_t(int, npages, cli->cl_max_pages_per_rpc);
CDEBUG(D_CACHE, "%s: start to reclaim %ld pages from LRU\n",
cli_name(cli), npages);
rc = osc_lru_shrink(env, cli, npages, true);
if (rc >= npages) {
CDEBUG(D_CACHE, "%s: reclaimed %ld/%ld pages from LRU\n",
cli_name(cli), rc, npages);
if (osc_cache_too_much(cli) > 0)
ptlrpcd_queue_work(cli->cl_lru_work);
goto out;
} else if (rc > 0) {
npages -= rc;
}
CDEBUG(D_CACHE, "%s: cli %p no free slots, pages: %ld, busy: %ld.\n",
CDEBUG(D_CACHE, "%s: cli %p no free slots, pages: %ld/%ld, want: %ld\n",
cli_name(cli), cli, atomic_long_read(&cli->cl_lru_in_list),
atomic_long_read(&cli->cl_lru_busy));
atomic_long_read(&cli->cl_lru_busy), npages);
/* Reclaim LRU slots from other client_obd as it can't free enough
* from its own. This should rarely happen.
@ -701,11 +725,12 @@ long osc_lru_reclaim(struct client_obd *cli)
if (osc_cache_too_much(cli) > 0) {
spin_unlock(&cache->ccc_lru_lock);
rc = osc_lru_shrink(env, cli, osc_cache_too_much(cli),
true);
rc = osc_lru_shrink(env, cli, npages, true);
spin_lock(&cache->ccc_lru_lock);
if (rc != 0)
if (rc >= npages)
break;
if (rc > 0)
npages -= rc;
}
}
spin_unlock(&cache->ccc_lru_lock);
@ -743,7 +768,7 @@ static int osc_lru_reserve(const struct lu_env *env, struct osc_object *obj,
LASSERT(atomic_long_read(cli->cl_lru_left) >= 0);
while (!atomic_long_add_unless(cli->cl_lru_left, -1, 0)) {
/* run out of LRU spaces, try to drop some by itself */
rc = osc_lru_reclaim(cli);
rc = osc_lru_reclaim(cli, 1);
if (rc < 0)
break;
if (rc > 0)
@ -846,7 +871,7 @@ void osc_dec_unstable_pages(struct ptlrpc_request *req)
if (!unstable_count)
wake_up_all(&cli->cl_cache->ccc_unstable_waitq);
if (osc_cache_too_much(cli))
if (waitqueue_active(&osc_lru_waitq))
(void)ptlrpcd_queue_work(cli->cl_lru_work);
}

4
drivers/staging/lustre/lustre/osc/osc_request.c
View File

@ -583,12 +583,12 @@ static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
oa->o_undirty = 0;
} else if (unlikely(atomic_long_read(&obd_dirty_pages) -
atomic_long_read(&obd_dirty_transit_pages) >
(obd_max_dirty_pages + 1))) {
(long)(obd_max_dirty_pages + 1))) {
/* The atomic_read() allowing the atomic_inc() are
* not covered by a lock thus they may safely race and trip
* this CERROR() unless we add in a small fudge factor (+1).
*/
CERROR("%s: dirty %ld + %ld > system dirty_max %lu\n",
CERROR("%s: dirty %ld + %ld > system dirty_max %ld\n",
cli_name(cli), atomic_long_read(&obd_dirty_pages),
atomic_long_read(&obd_dirty_transit_pages),
obd_max_dirty_pages);