diff options
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/dsl_pool.c | 50 | ||||
| -rw-r--r-- | module/zfs/zil.c | 15 |
2 files changed, 56 insertions, 9 deletions
diff --git a/module/zfs/dsl_pool.c b/module/zfs/dsl_pool.c index a28be34fb..6f435dcc2 100644 --- a/module/zfs/dsl_pool.c +++ b/module/zfs/dsl_pool.c @@ -135,6 +135,36 @@ unsigned long zfs_delay_scale = 1000 * 1000 * 1000 / 2000; */ int zfs_sync_taskq_batch_pct = 75; +/* + * These tunables determine the behavior of how zil_itxg_clean() is + * called via zil_clean() in the context of spa_sync(). When an itxg + * list needs to be cleaned, TQ_NOSLEEP will be used when dispatching. + * If the dispatch fails, the call to zil_itxg_clean() will occur + * synchronously in the context of spa_sync(), which can negatively + * impact the performance of spa_sync() (e.g. in the case of the itxg + * list having a large number of itxs that needs to be cleaned). + * + * Thus, these tunables can be used to manipulate the behavior of the + * taskq used by zil_clean(); they determine the number of taskq entries + * that are pre-populated when the taskq is first created (via the + * "zfs_zil_clean_taskq_minalloc" tunable) and the maximum number of + * taskq entries that are cached after an on-demand allocation (via the + * "zfs_zil_clean_taskq_maxalloc"). + * + * The idea being, we want to try reasonably hard to ensure there will + * already be a taskq entry pre-allocated by the time that it is needed + * by zil_clean(). This way, we can avoid the possibility of an + * on-demand allocation of a new taskq entry from failing, which would + * result in zil_itxg_clean() being called synchronously from zil_clean() + * (which can adversely affect performance of spa_sync()). + * + * Additionally, the number of threads used by the taskq can be + * configured via the "zfs_zil_clean_taskq_nthr_pct" tunable. + */ +int zfs_zil_clean_taskq_nthr_pct = 100; +int zfs_zil_clean_taskq_minalloc = 1024; +int zfs_zil_clean_taskq_maxalloc = 1024 * 1024; + int dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp) { @@ -176,6 +206,12 @@ dsl_pool_open_impl(spa_t *spa, uint64_t txg) zfs_sync_taskq_batch_pct, minclsyspri, 1, INT_MAX, TASKQ_THREADS_CPU_PCT); + dp->dp_zil_clean_taskq = taskq_create("dp_zil_clean_taskq", + zfs_zil_clean_taskq_nthr_pct, minclsyspri, + zfs_zil_clean_taskq_minalloc, + zfs_zil_clean_taskq_maxalloc, + TASKQ_PREPOPULATE | TASKQ_THREADS_CPU_PCT); + mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL); cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL); @@ -334,6 +370,7 @@ dsl_pool_close(dsl_pool_t *dp) txg_list_destroy(&dp->dp_sync_tasks); txg_list_destroy(&dp->dp_dirty_dirs); + taskq_destroy(dp->dp_zil_clean_taskq); taskq_destroy(dp->dp_sync_taskq); /* @@ -1155,5 +1192,18 @@ MODULE_PARM_DESC(zfs_delay_scale, "how quickly delay approaches infinity"); module_param(zfs_sync_taskq_batch_pct, int, 0644); MODULE_PARM_DESC(zfs_sync_taskq_batch_pct, "max percent of CPUs that are used to sync dirty data"); + +module_param(zfs_zil_clean_taskq_nthr_pct, int, 0644); +MODULE_PARM_DESC(zfs_zil_clean_taskq_nthr_pct, + "max percent of CPUs that are used per dp_sync_taskq"); + +module_param(zfs_zil_clean_taskq_minalloc, int, 0644); +MODULE_PARM_DESC(zfs_zil_clean_taskq_minalloc, + "number of taskq entries that are pre-populated"); + +module_param(zfs_zil_clean_taskq_maxalloc, int, 0644); +MODULE_PARM_DESC(zfs_zil_clean_taskq_maxalloc, + "max number of taskq entries that are cached"); + /* END CSTYLED */ #endif diff --git a/module/zfs/zil.c b/module/zfs/zil.c index e90e583ae..c34c1d253 100644 --- a/module/zfs/zil.c +++ b/module/zfs/zil.c @@ -1473,8 +1473,7 @@ zil_clean(zilog_t *zilog, uint64_t synced_txg) return; } ASSERT3U(itxg->itxg_txg, <=, synced_txg); - ASSERT(itxg->itxg_txg != 0); - ASSERT(zilog->zl_clean_taskq != NULL); + ASSERT3U(itxg->itxg_txg, !=, 0); clean_me = itxg->itxg_itxs; itxg->itxg_itxs = NULL; itxg->itxg_txg = 0; @@ -1485,8 +1484,11 @@ zil_clean(zilog_t *zilog, uint64_t synced_txg) * free it in-line. This should be rare. Note, using TQ_SLEEP * created a bad performance problem. */ - if (taskq_dispatch(zilog->zl_clean_taskq, - (void (*)(void *))zil_itxg_clean, clean_me, TQ_NOSLEEP) == 0) + ASSERT3P(zilog->zl_dmu_pool, !=, NULL); + ASSERT3P(zilog->zl_dmu_pool->dp_zil_clean_taskq, !=, NULL); + taskqid_t id = taskq_dispatch(zilog->zl_dmu_pool->dp_zil_clean_taskq, + (void (*)(void *))zil_itxg_clean, clean_me, TQ_NOSLEEP); + if (id == TASKQID_INVALID) zil_itxg_clean(clean_me); } @@ -1959,13 +1961,10 @@ zil_open(objset_t *os, zil_get_data_t *get_data) { zilog_t *zilog = dmu_objset_zil(os); - ASSERT(zilog->zl_clean_taskq == NULL); ASSERT(zilog->zl_get_data == NULL); ASSERT(list_is_empty(&zilog->zl_lwb_list)); zilog->zl_get_data = get_data; - zilog->zl_clean_taskq = taskq_create("zil_clean", 1, defclsyspri, - 2, 2, TASKQ_PREPOPULATE); return (zilog); } @@ -2000,8 +1999,6 @@ zil_close(zilog_t *zilog) if (txg < spa_freeze_txg(zilog->zl_spa)) VERIFY(!zilog_is_dirty(zilog)); - taskq_destroy(zilog->zl_clean_taskq); - zilog->zl_clean_taskq = NULL; zilog->zl_get_data = NULL; /* |