perf record: Fix --switch-output documentation and comment

There's no --signal-trigger option, also adding the code comment into
record man page.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Wang Nan <wangnan0@huawei.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1483431600-19887-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 27fc3617c6a42066bf7a64bb2ace9961a350183b..5054d9147f0f03122f96338f96e9acd08cc36992 100644 (file)
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -430,6 +430,10 @@ that gets then processed, possibly via a perf script, to decide if that
 particular perf.data snapshot should be kept or not.
 
 Implies --timestamp-filename, --no-buildid and --no-buildid-cache.
+The reason for the latter two is to reduce the data file switching
+overhead. You can still switch them on with:
+
+  --switch-output --no-no-buildid  --no-no-buildid-cache
 
 --dry-run::
 Parse options then exit. --dry-run can be used to detect errors in cmdline

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 31cf0ce12a6531c09bc1f307cc2c709a69a13639..4ec10e9427d915a041e0510eaac2ded2daf9fc07 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1636,7 +1636,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
                 * overhead. Still generate buildid if they are required
                 * explicitly using
                 *
-                *  perf record --signal-trigger --no-no-buildid \
+                *  perf record --switch-output --no-no-buildid \
                 *              --no-no-buildid-cache
                 *
                 * Following code equals to: