perf bench: Documentation update

The current perf-bench documentation has a couple of typos and even
lacks entire description of mem subsystem. Fix it.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1340172486-17805-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 6 insertions, 6 deletions

diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c
index 71557225bf92..d990365cafa0 100644
--- a/tools/perf/bench/mem-memcpy.c
+++ b/tools/perf/bench/mem-memcpy.c
@@ -32,13 +32,13 @@ static bool		no_prefault;
 static const struct option options[] = {
         OPT_STRING('l', "length", &length_str, "1MB",
                     "Specify length of memory to copy. "
-                    "available unit: B, MB, GB (upper and lower)"),
+                    "Available units: B, KB, MB, GB and TB (upper and lower)"),
         OPT_STRING('r', "routine", &routine, "default",
                     "Specify routine to copy"),
         OPT_INTEGER('i', "iterations", &iterations,
                     "repeat memcpy() invocation this number of times"),
         OPT_BOOLEAN('c', "clock", &use_clock,
-                    "Use CPU clock for measuring"),
+                    "Use cycles event instead of gettimeofday() for measuring"),
         OPT_BOOLEAN('o', "only-prefault", &only_prefault,
                     "Show only the result with page faults before memcpy()"),
         OPT_BOOLEAN('n', "no-prefault", &no_prefault,
diff --git a/tools/perf/bench/mem-memset.c b/tools/perf/bench/mem-memset.c
index e9079185bd72..bf0d5f552017 100644
--- a/tools/perf/bench/mem-memset.c
+++ b/tools/perf/bench/mem-memset.c
@@ -31,14 +31,14 @@ static bool		no_prefault;
 
 static const struct option options[] = {
         OPT_STRING('l', "length", &length_str, "1MB",
-                    "Specify length of memory to copy. "
-                    "available unit: B, MB, GB (upper and lower)"),
+                    "Specify length of memory to set. "
+                    "Available units: B, KB, MB, GB and TB (upper and lower)"),
         OPT_STRING('r', "routine", &routine, "default",
-                    "Specify routine to copy"),
+                    "Specify routine to set"),
         OPT_INTEGER('i', "iterations", &iterations,
                     "repeat memset() invocation this number of times"),
         OPT_BOOLEAN('c', "clock", &use_clock,
-                    "Use CPU clock for measuring"),
+                    "Use cycles event instead of gettimeofday() for measuring"),
         OPT_BOOLEAN('o', "only-prefault", &only_prefault,
                     "Show only the result with page faults before memset()"),
         OPT_BOOLEAN('n', "no-prefault", &no_prefault,