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| author | Arnaldo Carvalho de Melo | 2016-04-15 22:46:31 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo | 2016-04-15 22:46:31 +0200 |
| commit | f5e7150cd9a7779a54b192d21afb9245384db8bc (patch) | |
| tree | e061fe5d0e029765c5c4e57d68cc503198f66bba /tools/perf/util/evlist.h | |
| parent | perf trace: Make --(min,max}-stack imply "--call-graph dwarf" (diff) | |
| download | kernel-qcow2-linux-f5e7150cd9a7779a54b192d21afb9245384db8bc.tar.gz kernel-qcow2-linux-f5e7150cd9a7779a54b192d21afb9245384db8bc.tar.xz kernel-qcow2-linux-f5e7150cd9a7779a54b192d21afb9245384db8bc.zip | |
perf evlist: Expose perf_event_mlock_kb_in_pages() helper
When the user doesn't set --mmap-pages, perf_evlist__mmap() will do it
by reading the maximum possible for a non-root user from the
/proc/sys/kernel/perf_event_mlock_kb file.
Expose that function so that 'perf trace' can, for root users, to bump
mmap-pages to a higher value for root, based on the contents of this
proc file.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-xay69plylwibpb3l4isrpl1k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evlist.h')
| -rw-r--r-- | tools/perf/util/evlist.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index da46423998e8..208897a646ca 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -158,6 +158,8 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset); +unsigned long perf_event_mlock_kb_in_pages(void); + int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages, bool overwrite, unsigned int auxtrace_pages, bool auxtrace_overwrite); |