From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f48.google.com (mail-wm0-f48.google.com [74.125.82.48]) by kanga.kvack.org (Postfix) with ESMTP id D362C6B0254 for ; Thu, 12 Nov 2015 18:42:08 -0500 (EST) Received: by wmww144 with SMTP id w144so8225397wmw.1 for ; Thu, 12 Nov 2015 15:42:08 -0800 (PST) Received: from gum.cmpxchg.org (gum.cmpxchg.org. [85.214.110.215]) by mx.google.com with ESMTPS id m135si1461191wmb.47.2015.11.12.15.42.07 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 12 Nov 2015 15:42:07 -0800 (PST) From: Johannes Weiner Subject: [PATCH 02/14] mm: vmscan: simplify memcg vs. global shrinker invocation Date: Thu, 12 Nov 2015 18:41:21 -0500 Message-Id: <1447371693-25143-3-git-send-email-hannes@cmpxchg.org> In-Reply-To: <1447371693-25143-1-git-send-email-hannes@cmpxchg.org> References: <1447371693-25143-1-git-send-email-hannes@cmpxchg.org> Sender: owner-linux-mm@kvack.org List-ID: To: David Miller , Andrew Morton Cc: Vladimir Davydov , Tejun Heo , Michal Hocko , netdev@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com Letting shrink_slab() handle the root_mem_cgroup, and implicitely the !CONFIG_MEMCG case, allows shrink_zone() to invoke the shrinkers unconditionally from within the memcg iteration loop. Signed-off-by: Johannes Weiner Acked-by: Michal Hocko --- include/linux/memcontrol.h | 2 ++ mm/vmscan.c | 31 ++++++++++++++++--------------- 2 files changed, 18 insertions(+), 15 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 9a7a24a..251bb51 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -502,6 +502,8 @@ void mem_cgroup_split_huge_fixup(struct page *head); #else /* CONFIG_MEMCG */ struct mem_cgroup; +#define root_mem_cgroup NULL + static inline void mem_cgroup_events(struct mem_cgroup *memcg, enum mem_cgroup_events_index idx, unsigned int nr) diff --git a/mm/vmscan.c b/mm/vmscan.c index a4507ec..e4f5b3c 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -411,6 +411,10 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct shrinker *shrinker; unsigned long freed = 0; + /* Global shrinker mode */ + if (memcg == root_mem_cgroup) + memcg = NULL; + if (memcg && !memcg_kmem_is_active(memcg)) return 0; @@ -2410,11 +2414,22 @@ static bool shrink_zone(struct zone *zone, struct scan_control *sc, shrink_lruvec(lruvec, swappiness, sc, &lru_pages); zone_lru_pages += lru_pages; - if (memcg && is_classzone) + /* + * Shrink the slab caches in the same proportion that + * the eligible LRU pages were scanned. + */ + if (is_classzone) { shrink_slab(sc->gfp_mask, zone_to_nid(zone), memcg, sc->nr_scanned - scanned, lru_pages); + if (reclaim_state) { + sc->nr_reclaimed += + reclaim_state->reclaimed_slab; + reclaim_state->reclaimed_slab = 0; + } + } + /* * Direct reclaim and kswapd have to scan all memory * cgroups to fulfill the overall scan target for the @@ -2432,20 +2447,6 @@ static bool shrink_zone(struct zone *zone, struct scan_control *sc, } } while ((memcg = mem_cgroup_iter(root, memcg, &reclaim))); - /* - * Shrink the slab caches in the same proportion that - * the eligible LRU pages were scanned. - */ - if (global_reclaim(sc) && is_classzone) - shrink_slab(sc->gfp_mask, zone_to_nid(zone), NULL, - sc->nr_scanned - nr_scanned, - zone_lru_pages); - - if (reclaim_state) { - sc->nr_reclaimed += reclaim_state->reclaimed_slab; - reclaim_state->reclaimed_slab = 0; - } - vmpressure(sc->gfp_mask, sc->target_mem_cgroup, sc->nr_scanned - nr_scanned, sc->nr_reclaimed - nr_reclaimed); -- 2.6.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org