linux-kernel - [PATCH] mm/zswap : NUMA aware allocation for zswap

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Message-ID: <1401209749.5367.245.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 27 May 2014 09:55:49 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Seth Jennings <sjennings@...iantweb.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>
Subject: [PATCH] mm/zswap : NUMA aware allocation for zswap_dstmem

From: Eric Dumazet <edumazet@...gle.com>

zswap_dstmem is a percpu block of memory, which should
be allocated using kmalloc_node(), to get better NUMA
locality.

Without it, all the blocks are allocated from a single node.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 mm/zswap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index aeaef0fb5624..008388fe7b0f 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -347,7 +347,7 @@ static int __zswap_cpu_notifier(unsigned long action, unsigned long cpu)
 			return NOTIFY_BAD;
 		}
 		*per_cpu_ptr(zswap_comp_pcpu_tfms, cpu) = tfm;
-		dst = kmalloc(PAGE_SIZE * 2, GFP_KERNEL);
+		dst = kmalloc_node(PAGE_SIZE * 2, GFP_KERNEL, cpu_to_node(cpu));
 		if (!dst) {
 			pr_err("can't allocate compressor buffer\n");
 			crypto_free_comp(tfm);


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