perf lock contention: Check --max-stack option

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The --max-stack option is used to allocate the BPF stack map and stack
trace array in the userspace.  Check the value properly before using.
Practically it cannot be greater than the sysctl_perf_event_max_stack.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221028180128.3311491-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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Namhyung Kim 2022-10-28 11:01:26 -07:00 • committed by Arnaldo Carvalho de Melo

parent 005ef2b41b

commit 0a277b6226

1 changed files with 27 additions and 3 deletions

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tools/perf/builtin-lock.c

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