diff options
Diffstat (limited to 'module/spl/spl-kmem.c')
| -rw-r--r-- | module/spl/spl-kmem.c | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/module/spl/spl-kmem.c b/module/spl/spl-kmem.c index 6cd3acb72..413aa1245 100644 --- a/module/spl/spl-kmem.c +++ b/module/spl/spl-kmem.c @@ -34,6 +34,19 @@ #define SS_DEBUG_SUBSYS SS_KMEM /* + * Cache expiration was implemented because it was part of the default Solaris + * kmem_cache behavior. The idea is that per-cpu objects which haven't been + * accessed in several seconds should be returned to the cache. On the other + * hand Linux slabs never move objects back to the slabs unless there is + * memory pressure on the system. By default both methods are disabled, but + * may be enabled by setting KMC_EXPIRE_AGE or KMC_EXPIRE_MEM. + */ +unsigned int spl_kmem_cache_expire = 0; +EXPORT_SYMBOL(spl_kmem_cache_expire); +module_param(spl_kmem_cache_expire, uint, 0644); +MODULE_PARM_DESC(spl_kmem_cache_expire, "By age (0x1) or low memory (0x2)"); + +/* * The minimum amount of memory measured in pages to be free at all * times on the system. This is similar to Linux's zone->pages_min * multiplied by the number of zones and is sized based on that. @@ -1317,6 +1330,10 @@ spl_cache_age(void *data) ASSERT(skc->skc_magic == SKC_MAGIC); + /* Dynamically disabled at run time */ + if (!(spl_kmem_cache_expire & KMC_EXPIRE_AGE)) + return; + atomic_inc(&skc->skc_ref); spl_on_each_cpu(spl_magazine_age, skc, 1); spl_slab_reclaim(skc, skc->skc_reap, 0); @@ -1609,9 +1626,10 @@ spl_kmem_cache_create(char *name, size_t size, size_t align, if (rc) SGOTO(out, rc); - skc->skc_taskqid = taskq_dispatch_delay(spl_kmem_cache_taskq, - spl_cache_age, skc, TQ_SLEEP, - ddi_get_lbolt() + skc->skc_delay / 3 * HZ); + if (spl_kmem_cache_expire & KMC_EXPIRE_AGE) + skc->skc_taskqid = taskq_dispatch_delay(spl_kmem_cache_taskq, + spl_cache_age, skc, TQ_SLEEP, + ddi_get_lbolt() + skc->skc_delay / 3 * HZ); down_write(&spl_kmem_cache_sem); list_add_tail(&skc->skc_list, &spl_kmem_cache_list); @@ -2168,7 +2186,17 @@ spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count) } while (do_reclaim); } - /* Reclaim from the cache, ignoring it's age and delay. */ + /* Reclaim from the magazine then the slabs ignoring age and delay. */ + if (spl_kmem_cache_expire & KMC_EXPIRE_MEM) { + spl_kmem_magazine_t *skm; + int i; + + for_each_online_cpu(i) { + skm = skc->skc_mag[i]; + spl_cache_flush(skc, skm, skm->skm_avail); + } + } + spl_slab_reclaim(skc, count, 1); clear_bit(KMC_BIT_REAPING, &skc->skc_flags); smp_mb__after_clear_bit(); |