linux-kernel - [patch] mm, slab: only set __GFP

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Date:   Tue, 17 Oct 2017 15:30:01 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
cc:     Christoph Lameter <cl@...ux.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [patch] mm, slab: only set __GFP_RECLAIMABLE once

SLAB_RECLAIM_ACCOUNT is a permanent attribute of a slab cache.  Set 
__GFP_RECLAIMABLE as part of its ->allocflags rather than check the cachep 
flag on every page allocation.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/slab.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1409,8 +1409,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
 	int nr_pages;
 
 	flags |= cachep->allocflags;
-	if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
-		flags |= __GFP_RECLAIMABLE;
 
 	page = __alloc_pages_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
 	if (!page) {
@@ -2143,6 +2141,8 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
 	cachep->allocflags = __GFP_COMP;
 	if (flags & SLAB_CACHE_DMA)
 		cachep->allocflags |= GFP_DMA;
+	if (flags & SLAB_RECLAIM_ACCOUNT)
+		cachep->allocflags |= __GFP_RECLAIMABLE;
 	cachep->size = size;
 	cachep->reciprocal_buffer_size = reciprocal_value(size);