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Groups > linux.kernel > #1551715
| From | tip-bot for Jiri Olsa <tipbot@zytor.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [tip:perf/urgent] perf record: Fix --switch-output documentation and comment |
| Date | 2017-01-05 09:00 +0100 |
| Message-ID | <sWb7R-8fR-35@gated-at.bofh.it> (permalink) |
| References | <sVsDM-3nL-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Commit-ID: 60437ac02f398e0ee0927748d4798dd5534ac90d Gitweb: http://git.kernel.org/tip/60437ac02f398e0ee0927748d4798dd5534ac90d Author: Jiri Olsa <jolsa@kernel.org> AuthorDate: Tue, 3 Jan 2017 09:19:56 +0100 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Tue, 3 Jan 2017 11:11:38 -0300 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> --- tools/perf/Documentation/perf-record.txt | 4 ++++ tools/perf/builtin-record.c | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 27fc361..5054d91 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 31cf0ce..4ec10e9 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:
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[tip:perf/urgent] perf record: Fix --switch-output documentation and comment tip-bot for Jiri Olsa <tipbot@zytor.com> - 2017-01-05 09:00 +0100
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