From acd7229f0349e4dde0e67eff2bef29c3fdf1ad07 Mon Sep 17 00:00:00 2001 From: Dmitry Antipov Date: Mon, 24 Aug 2020 17:08:07 +0300 Subject: performance/md-cache: simplify and cleanup internal time management Since this xlator measures time intervals in seconds, timespec_now() may be replaced with simpler gf_time(). Consistently use time_t and uint32_t for timeouts, better error checking in mdc_reconfigure(), adjust comments and messages as well. Signed-off-by: Dmitry Antipov Change-Id: I757c988e52db9d92348a900a43c617022a3d62af Updates: #1002 --- xlators/performance/md-cache/src/md-cache.c | 70 +++++++++++++---------------- 1 file changed, 31 insertions(+), 39 deletions(-) diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c index 1313c2b55c3..9add4167aaf 100644 --- a/xlators/performance/md-cache/src/md-cache.c +++ b/xlators/performance/md-cache/src/md-cache.c @@ -8,7 +8,6 @@ cases as published by the Free Software Foundation. */ -#include #include #include #include @@ -33,8 +32,7 @@ struct mdc_statfs_cache { pthread_mutex_t lock; - gf_boolean_t initialized; - struct timespec last_refreshed; + time_t last_refreshed; /* (time_t)-1 if not yet initialized. */ struct statvfs buf; }; @@ -61,7 +59,7 @@ struct mdc_statistics { }; struct mdc_conf { - int timeout; + uint32_t timeout; gf_boolean_t cache_posix_acl; gf_boolean_t cache_glusterfs_acl; gf_boolean_t cache_selinux; @@ -376,10 +374,9 @@ unlock: static gf_boolean_t __is_cache_valid(xlator_t *this, time_t mdc_time) { - time_t now = 0; gf_boolean_t ret = _gf_true; struct mdc_conf *conf = NULL; - int timeout = 0; + uint32_t timeout = 0; time_t last_child_down = 0; conf = this->private; @@ -393,15 +390,13 @@ __is_cache_valid(xlator_t *this, time_t mdc_time) last_child_down = conf->last_child_down; timeout = conf->timeout; - time(&now); - if ((mdc_time == 0) || ((last_child_down != 0) && (mdc_time < last_child_down))) { ret = _gf_false; goto out; } - if (now >= (mdc_time + timeout)) { + if (gf_time() >= (mdc_time + timeout)) { ret = _gf_false; } @@ -581,10 +576,9 @@ mdc_inode_iatt_set_validate(xlator_t *this, inode_t *inode, struct iatt *prebuf, mdc_from_iatt(mdc, iatt); mdc->valid = _gf_true; if (update_time) { - time(&mdc->ia_time); - + mdc->ia_time = gf_time(); if (mdc->xa_time && update_xa_time) - time(&mdc->xa_time); + mdc->xa_time = mdc->ia_time; } gf_msg_callingfn( @@ -1063,8 +1057,7 @@ mdc_cache_statfs(xlator_t *this, struct statvfs *buf) pthread_mutex_lock(&conf->statfs_cache.lock); { memcpy(&conf->statfs_cache.buf, buf, sizeof(struct statvfs)); - clock_gettime(CLOCK_MONOTONIC, &conf->statfs_cache.last_refreshed); - conf->statfs_cache.initialized = _gf_true; + conf->statfs_cache.last_refreshed = gf_time(); } pthread_mutex_unlock(&conf->statfs_cache.lock); } @@ -1073,8 +1066,7 @@ int mdc_load_statfs_info_from_cache(xlator_t *this, struct statvfs **buf) { struct mdc_conf *conf = this->private; - struct timespec now; - double cache_age = 0.0; + uint32_t cache_age = 0; int ret = 0; if (!buf || !conf) { @@ -1083,23 +1075,23 @@ mdc_load_statfs_info_from_cache(xlator_t *this, struct statvfs **buf) } *buf = NULL; - timespec_now(&now); pthread_mutex_lock(&conf->statfs_cache.lock); { - /* Skip if the cache is not initialized */ - if (!conf->statfs_cache.initialized) { + /* Skip if the cache is not initialized. */ + if (conf->statfs_cache.last_refreshed == (time_t)-1) { ret = -1; goto unlock; } - cache_age = (now.tv_sec - conf->statfs_cache.last_refreshed.tv_sec); + cache_age = (gf_time() - conf->statfs_cache.last_refreshed); - gf_log(this->name, GF_LOG_DEBUG, "STATFS cache age = %lf", cache_age); + gf_log(this->name, GF_LOG_DEBUG, "STATFS cache age = %u secs", + cache_age); if (cache_age > conf->timeout) { - /* Expire the cache */ + /* Expire the cache. */ gf_log(this->name, GF_LOG_DEBUG, - "Cache age %lf exceeded timeout %d", cache_age, + "Cache age %u secs exceeded timeout %u secs", cache_age, conf->timeout); ret = -1; goto unlock; @@ -3616,7 +3608,7 @@ int mdc_reconfigure(xlator_t *this, dict_t *options) { struct mdc_conf *conf = NULL; - int timeout = 0; + int timeout = 0, ret = 0; char *tmp_str = NULL; conf = this->private; @@ -3656,7 +3648,10 @@ mdc_reconfigure(xlator_t *this, dict_t *options) GF_OPTION_RECONF("md-cache-statfs", conf->cache_statfs, options, bool, out); GF_OPTION_RECONF("xattr-cache-list", tmp_str, options, str, out); - mdc_xattr_list_populate(conf, tmp_str); + + ret = mdc_xattr_list_populate(conf, tmp_str); + if (ret < 0) + goto out; /* If timeout is greater than 60s (default before the patch that added * cache invalidation support was added) then, cache invalidation @@ -3669,25 +3664,22 @@ mdc_reconfigure(xlator_t *this, dict_t *options) } conf->timeout = timeout; - (void)mdc_register_xattr_inval(this); + ret = mdc_register_xattr_inval(this); out: - return 0; + return ret; } int32_t mdc_mem_acct_init(xlator_t *this) { - int ret = -1; - - ret = xlator_mem_acct_init(this, gf_mdc_mt_end + 1); - return ret; + return xlator_mem_acct_init(this, gf_mdc_mt_end + 1); } int mdc_init(xlator_t *this) { struct mdc_conf *conf = NULL; - int timeout = 0; + uint32_t timeout = 0; char *tmp_str = NULL; conf = GF_CALLOC(sizeof(*conf), 1, gf_mdc_mt_mdc_conf_t); @@ -3699,7 +3691,7 @@ mdc_init(xlator_t *this) LOCK_INIT(&conf->lock); - GF_OPTION_INIT("md-cache-timeout", timeout, int32, out); + GF_OPTION_INIT("md-cache-timeout", timeout, uint32, out); GF_OPTION_INIT("cache-selinux", conf->cache_selinux, bool, out); @@ -3733,7 +3725,9 @@ mdc_init(xlator_t *this) GF_OPTION_INIT("xattr-cache-list", tmp_str, str, out); mdc_xattr_list_populate(conf, tmp_str); - time(&conf->last_child_down); + conf->last_child_down = gf_time(); + conf->statfs_cache.last_refreshed = (time_t)-1; + /* initialize gf_atomic_t counters */ GF_ATOMIC_INIT(conf->mdc_counter.stat_hit, 0); GF_ATOMIC_INIT(conf->mdc_counter.stat_miss, 0); @@ -3764,7 +3758,7 @@ out: } void -mdc_update_child_down_time(xlator_t *this, time_t *now) +mdc_update_child_down_time(xlator_t *this, time_t now) { struct mdc_conf *conf = NULL; @@ -3772,7 +3766,7 @@ mdc_update_child_down_time(xlator_t *this, time_t *now) LOCK(&conf->lock); { - conf->last_child_down = *now; + conf->last_child_down = now; } UNLOCK(&conf->lock); } @@ -3782,14 +3776,12 @@ mdc_notify(xlator_t *this, int event, void *data, ...) { int ret = 0; struct mdc_conf *conf = NULL; - time_t now = 0; conf = this->private; switch (event) { case GF_EVENT_CHILD_DOWN: case GF_EVENT_SOME_DESCENDENT_DOWN: - time(&now); - mdc_update_child_down_time(this, &now); + mdc_update_child_down_time(this, gf_time()); break; case GF_EVENT_UPCALL: if (conf->mdc_invalidation) -- cgit