linux-kernel - [Patch V3 2/9] kernel/profile.c: Replace cpu_to_mem() with cpu_to

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Date:	Mon, 17 Aug 2015 11:18:59 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Tang Chen <tangchen@...fujitsu.com>, Tejun Heo <tj@...nel.org>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: [Patch V3 2/9] kernel/profile.c: Replace cpu_to_mem() with cpu_to_node()

Function profile_cpu_callback() allocates memory without specifying
__GFP_THISNODE flag, so replace cpu_to_mem() with cpu_to_node()
because cpu_to_mem() may cause suboptimal memory allocation if
there's no free memory on the node returned by cpu_to_mem().

It's safe to use cpu_to_mem() because build_all_zonelists() also
builds suitable fallback zonelist for memoryless node.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 kernel/profile.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/profile.c b/kernel/profile.c
index a7bcd28d6e9f..d14805bdcc4c 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -336,7 +336,7 @@ static int profile_cpu_callback(struct notifier_block *info,
 	switch (action) {
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
-		node = cpu_to_mem(cpu);
+		node = cpu_to_node(cpu);
 		per_cpu(cpu_profile_flip, cpu) = 0;
 		if (!per_cpu(cpu_profile_hits, cpu)[1]) {
 			page = alloc_pages_exact_node(node,
-- 
1.7.10.4

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