From: Bruce Merry Date: Thu, 15 Jan 2015 09:20:22 +0000 (+0200) Subject: perf bench: Fix order of arguments to memcpy_alloc_mem X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e17fdaeaec066c725f73cd3cda1feae52b2646f5;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Acked-by: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20150115092022.GA11292@kryton Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c index 6c14afe8c1b1..db1d3a29d97f 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);