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| author | Wang Nan <wangnan0@huawei.com> | 2016-04-20 20:59:52 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-28 14:58:59 +0200 |
| commit | 0c1d46a8796e8309f1ca693e5cad6f318e4b8159 (patch) | |
| tree | 498eda9d8a2a2164bcfe409813fe44df2501d1a3 /tools/perf/Documentation | |
| parent | perf record: Force enable --timestamp-filename when --switch-output is provided (diff) | |
| download | linux-0c1d46a8796e8309f1ca693e5cad6f318e4b8159.tar.xz linux-0c1d46a8796e8309f1ca693e5cad6f318e4b8159.zip | |
perf record: Disable buildid cache options by default in switch output mode
The cost of buildid cache processing is high: reading all events in
output perf.data, opening each elf file to read buildids then copying
them into ~/.debug directory. In switch output mode, these heavy works
block perf from receiving perf events for too long.
Enable no-buildid and no-buildid-cache by default if --switch-output is
provided. Still allow user use --no-no-buildid to explicitly enable
buildid in this case.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1461178794-40467-6-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
[ Updated man page ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 79a8a14f37b1..8dbee832abd9 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -358,7 +358,7 @@ A possible use case is to, given an external event, slice the perf.data file 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. +Implies --timestamp-filename, --no-buildid and --no-buildid-cache. SEE ALSO -------- |