linux-kernel - [tip:perf/urgent] perf bench: Fix order of arguments to memcpy_alloc

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Message-ID: <tip-e17fdaeaec066c725f73cd3cda1feae52b2646f5@git.kernel.org>
Date:	Sun, 1 Mar 2015 08:49:26 -0800
From:	tip-bot for Bruce Merry <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, acme@...hat.com, paulus@...ba.org, bmerry@....ac.za,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, mingo@...nel.org
Subject: [tip:perf/urgent] perf bench:
  Fix order of arguments to memcpy_alloc_mem

Commit-ID:  e17fdaeaec066c725f73cd3cda1feae52b2646f5
Gitweb:     http://git.kernel.org/tip/e17fdaeaec066c725f73cd3cda1feae52b2646f5
Author:     Bruce Merry <bmerry@....ac.za>
AuthorDate: Thu, 15 Jan 2015 11:20:22 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Sun, 22 Feb 2015 23:10:56 -0300

perf bench: Fix order of arguments to memcpy_alloc_mem

This was causing the destination instead of the source to be filled.  As
a result, the source was typically all mapped to one zero page, and
hence very cacheable.

Signed-off-by: Bruce Merry <bmerry@....ac.za>
Acked-by: Ingo Molnar <mingo@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20150115092022.GA11292@kryton
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/bench/mem-memcpy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c
index 6c14afe..db1d3a2 100644
--- a/tools/perf/bench/mem-memcpy.c
+++ b/tools/perf/bench/mem-memcpy.c
@@ -289,7 +289,7 @@ static u64 do_memcpy_cycle(const struct routine *r, size_t len, bool prefault)
 	memcpy_t fn = r->fn.memcpy;
 	int i;
 
-	memcpy_alloc_mem(&src, &dst, len);
+	memcpy_alloc_mem(&dst, &src, len);
 
 	if (prefault)
 		fn(dst, src, len);
@@ -312,7 +312,7 @@ static double do_memcpy_gettimeofday(const struct routine *r, size_t len,
 	void *src = NULL, *dst = NULL;
 	int i;
 
-	memcpy_alloc_mem(&src, &dst, len);
+	memcpy_alloc_mem(&dst, &src, len);
 
 	if (prefault)
 		fn(dst, src, len);
--
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