linux-kernel - [tip:perf/core] perf bench: Default to all routines in ' perf bench mem'

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Message-ID: <tip-276197415685e2a91ce367562800cf0f8fbe482c@git.kernel.org>
Date:	Tue, 20 Oct 2015 00:43:45 -0700
From:	tip-bot for Ingo Molnar <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, tglx@...utronix.de, mitake@....info.waseda.ac.jp,
	peterz@...radead.org, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mingo@...nel.org, jolsa@...hat.com,
	acme@...hat.com, namhyung@...nel.org, dsahern@...il.com
Subject: [tip:perf/core] perf bench: Default to all routines in '
 perf bench mem'

Commit-ID:  276197415685e2a91ce367562800cf0f8fbe482c
Gitweb:     http://git.kernel.org/tip/276197415685e2a91ce367562800cf0f8fbe482c
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Mon, 19 Oct 2015 10:04:18 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 19 Oct 2015 15:05:34 -0300

perf bench: Default to all routines in 'perf bench mem'

So few people know that the --routine option to 'perf bench memcpy/memset'
exists, and would not know that it's capable of testing the kernel's
memcpy/memset implementations.

Furthermore, 'perf bench mem all' will not run all routines:

	vega:~> perf bench mem all
	# Running mem/memcpy benchmark...
	Routine default (Default memcpy() provided by glibc)
	# Copying 1MB Bytes ...

	     894.454383 MB/Sec
	       3.844734 GB/Sec (with prefault)

	# Running mem/memset benchmark...
	Routine default (Default memset() provided by glibc)
	# Copying 1MB Bytes ...

	       1.220703 GB/Sec
	       9.042245 GB/Sec (with prefault)

Because misleadingly the 'all' refers to 'all sub-benchmarks', not 'all
sub-benchmarks and routines'.

Fix all this by making the memcpy/memset routine to default to 'all',
which results in all the benchmarks being run:

	triton:~> perf bench mem all
	# Running mem/memcpy benchmark...
	Routine default (Default memcpy() provided by glibc)
	# Copying 1MB Bytes ...

	       1.448906 GB/Sec
	       4.957170 GB/Sec (with prefault)
	Routine x86-64-unrolled (unrolled memcpy() in arch/x86/lib/memcpy_64.S)
	# Copying 1MB Bytes ...

	       1.614153 GB/Sec
	       4.379204 GB/Sec (with prefault)
	Routine x86-64-movsq (movsq-based memcpy() in arch/x86/lib/memcpy_64.S)
	# Copying 1MB Bytes ...

	       1.570036 GB/Sec
	       4.264465 GB/Sec (with prefault)
	Routine x86-64-movsb (movsb-based memcpy() in arch/x86/lib/memcpy_64.S)
	# Copying 1MB Bytes ...

	       1.788576 GB/Sec
	       6.554111 GB/Sec (with prefault)

	# Running mem/memset benchmark...
	Routine default (Default memset() provided by glibc)
	# Copying 1MB Bytes ...

	       2.082223 GB/Sec
	       9.126752 GB/Sec (with prefault)
	Routine x86-64-unrolled (unrolled memset() in arch/x86/lib/memset_64.S)
	# Copying 1MB Bytes ...

	       5.710892 GB/Sec
	       8.346688 GB/Sec (with prefault)
	Routine x86-64-stosq (movsq-based memset() in arch/x86/lib/memset_64.S)
	# Copying 1MB Bytes ...

	       9.765625 GB/Sec
	      12.520032 GB/Sec (with prefault)
	Routine x86-64-stosb (movsb-based memset() in arch/x86/lib/memset_64.S)
	# Copying 1MB Bytes ...

	       9.668936 GB/Sec
	      12.682630 GB/Sec (with prefault)

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1445241870-24854-3-git-send-email-mingo@kernel.org
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 27606ff..263f841 100644
--- a/tools/perf/bench/mem-memcpy.c
+++ b/tools/perf/bench/mem-memcpy.c
@@ -24,7 +24,7 @@
 #define K 1024
 
 static const char	*length_str	= "1MB";
-static const char	*routine	= "default";
+static const char	*routine	= "all";
 static int		iterations	= 1;
 static bool		use_cycle;
 static int		cycle_fd;
@@ -35,7 +35,7 @@ static const struct option options[] = {
 	OPT_STRING('l', "length", &length_str, "1MB",
 		    "Specify length of memory to copy. "
 		    "Available units: B, KB, MB, GB and TB (upper and lower)"),
-	OPT_STRING('r', "routine", &routine, "default",
+	OPT_STRING('r', "routine", &routine, "all",
 		    "Specify routine to copy, \"all\" runs all available routines"),
 	OPT_INTEGER('i', "iterations", &iterations,
 		    "repeat memcpy() invocation this number of times"),
--
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