From c0e0fc14e3e65e519849dd9fbfb94a6c79d0d149 Mon Sep 17 00:00:00 2001 From: Prakash Surya Date: Fri, 27 Apr 2012 12:43:49 -0700 Subject: [PATCH] Ignore slab cache age and delay in direct reclaim When memory pressure triggers direct memory reclaim, a slabs age and delay should not prevent it from being freed. This patch ensures these values are ignored, allowing an empty slab to be freed in this code path no matter the value of its age and delay. This prevents needless scanning of the partial slabs and has been observed to significantly reduce the total cpu usage. In addition, it should allow for snappier reclaim under memory pressure. Signed-off-by: Prakash Surya Signed-off-by: Brian Behlendorf Closes #102 --- module/spl/spl-kmem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/module/spl/spl-kmem.c b/module/spl/spl-kmem.c index eadf1cb17..361030b18 100644 --- a/module/spl/spl-kmem.c +++ b/module/spl/spl-kmem.c @@ -1916,7 +1916,8 @@ spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count) if (skc->skc_reclaim) skc->skc_reclaim(skc->skc_private); - spl_slab_reclaim(skc, count, 0); + /* Reclaim from the cache, ignoring it's age and delay. */ + spl_slab_reclaim(skc, count, 1); clear_bit(KMC_BIT_REAPING, &skc->skc_flags); atomic_dec(&skc->skc_ref); -- 2.40.0