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perf tools: Set the maximum allowed stack from /proc/sys/kernel/perf_event_max_stack

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There is an upper limit to what tooling considers a valid callchain,
and it was tied to the hardcoded value in the kernel,
PERF_MAX_STACK_DEPTH (127), now that this can be tuned via a sysctl,
make it read it and use that as the upper limit, falling back to
PERF_MAX_STACK_DEPTH for kernels where this sysctl isn't present.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@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-yjqsd30nnkogvj5oyx9ghir9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-04-27 10:16:24 -03:00
parent c5dfd78eb7
commit 4cb93446c5
16 changed files with 28 additions and 18 deletions
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2
tools/perf/util/util.c
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@ -33,6 +33,8 @@ struct callchain_param callchain_param = {
unsigned int page_size;
int cacheline_size;
unsigned int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
bool test_attr__enabled;
bool perf_host = true;