[tip:perf/urgent] perf bench: Fix order of arguments to memcpy_alloc_mem
From: tip-bot for Bruce Merry
Date: Sun Mar 01 2015 - 11:50:38 EST
Commit-ID: e17fdaeaec066c725f73cd3cda1feae52b2646f5
Gitweb: http://git.kernel.org/tip/e17fdaeaec066c725f73cd3cda1feae52b2646f5
Author: Bruce Merry <bmerry@xxxxxxxxx>
AuthorDate: Thu, 15 Jan 2015 11:20:22 +0200
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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@xxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20150115092022.GA11292@kryton
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
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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