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| author | Arnaldo Carvalho de Melo | 2016-05-19 16:34:06 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo | 2016-05-20 16:43:56 +0200 |
| commit | fe176085a4d45fb241c04beea872ecbb8bef6a55 (patch) | |
| tree | 14a014f4c67daeaf06aa665d3ec50c9ec889e035 /tools/perf/Documentation/perf-script.txt | |
| parent | perf callchain: Stop validating callchains by the max_stack sysctl (diff) | |
| download | kernel-qcow2-linux-fe176085a4d45fb241c04beea872ecbb8bef6a55.tar.gz kernel-qcow2-linux-fe176085a4d45fb241c04beea872ecbb8bef6a55.tar.xz kernel-qcow2-linux-fe176085a4d45fb241c04beea872ecbb8bef6a55.zip | |
perf tools: Fix usage of max_stack sysctl
We cannot limit processing stacks from the current value of the sysctl,
as we may be processing perf.data files, possibly from other machines.
Instead use the old PERF_MAX_STACK_DEPTH, the sysctl default, that can
be overriden using --max-stack or equivalent.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Fixes: 4cb93446c587 ("perf tools: Set the maximum allowed stack from /proc/sys/kernel/perf_event_max_stack")
Link: http://lkml.kernel.org/n/tip-eqeutsr7n7wy0c36z24ytvii@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-script.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-script.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt index a856a1095893..4fc44c75263f 100644 --- a/tools/perf/Documentation/perf-script.txt +++ b/tools/perf/Documentation/perf-script.txt @@ -267,7 +267,7 @@ include::itrace.txt[] Note that when using the --itrace option the synthesized callchain size will override this value if the synthesized callchain size is bigger. - Default: /proc/sys/kernel/perf_event_max_stack when present, 127 otherwise. + Default: 127 --ns:: Use 9 decimal places when displaying time (i.e. show the nanoseconds) |