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| author | Jiri Olsa <jolsa@kernel.org> | 2017-01-03 09:19:56 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-01-03 11:11:38 -0300 |
| commit | 60437ac02f398e0ee0927748d4798dd5534ac90d (patch) | |
| tree | 3859fb2c428c14a564a60e56834dd2e93a2ce1a0 /tools/perf | |
| parent | efd21307119d5a23ac83ae8fd5a39a5c7aeb8493 (diff) | |
| download | linux-60437ac02f398e0ee0927748d4798dd5534ac90d.tar.gz linux-60437ac02f398e0ee0927748d4798dd5534ac90d.tar.bz2 linux-60437ac02f398e0ee0927748d4798dd5534ac90d.zip | |
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>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 4 | ||||
| -rw-r--r-- | tools/perf/builtin-record.c | 2 |
2 files changed, 5 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 27fc3617c6a4..5054d9147f0f 100644 --- 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 31cf0ce12a65..4ec10e9427d9 100644 --- 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: |