perf bench: Add memcpy() benchmark

'perf bench mem memcpy' is a benchmark suite for measuring memcpy()
performance.

Example on a Intel(R) Core(TM)2 Duo CPU E6850 @ 3.00GHz:

| % perf bench mem memcpy -l 1GB
| # Running mem/memcpy benchmark...
| # Copying 1MB Bytes from 0xb7d98008 to 0xb7e99008 ...
|
|     726.216412 MB/Sec

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1258471212-30281-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
[ v2: updated changelog, clarified history of builtin-bench.c ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 14 insertions, 1 deletions

diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index 90c39baae0de..e043eb83092a 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -12,6 +12,7 @@
  *
  * Available subsystem list:
  *  sched ... scheduler and IPC mechanism
+ *  mem   ... memory access performance
  *
  */
 
@@ -43,6 +44,15 @@ static struct bench_suite sched_suites[] = {
           NULL                  }
 };
 
+static struct bench_suite mem_suites[] = {
+        { "memcpy",
+          "Simple memory copy in various ways",
+          bench_mem_memcpy },
+        { NULL,
+          NULL,
+          NULL             }
+};
+
 struct bench_subsys {
         const char *name;
         const char *summary;
@@ -53,9 +63,12 @@ static struct bench_subsys subsystems[] = {
         { "sched",
           "scheduler and IPC mechanism",
           sched_suites },
+        { "mem",
+          "memory access performance",
+          mem_suites },
         { NULL,
           NULL,
-          NULL         }
+          NULL       }
 };
 
 static void dump_suites(int subsys_index)