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authorArnaldo Carvalho de Melo <acme@redhat.com>2016-04-27 16:16:24 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-04-27 16:29:07 +0300
commit4cb93446c587d56e2a54f4f83113daba2c0b6dee (patch)
treea251b1d510831dc071eadbbbe3e38a85fe643365 /tools/perf/util/scripting-engines
parentc5dfd78eb79851e278b7973031b9ca363da87a7e (diff)
downloadlinux-4cb93446c587d56e2a54f4f83113daba2c0b6dee.tar.xz
perf tools: Set the maximum allowed stack from /proc/sys/kernel/perf_event_max_stack
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>
Diffstat (limited to 'tools/perf/util/scripting-engines')
-rw-r--r--tools/perf/util/scripting-engines/trace-event-perl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index ae1cebc307c5..62c7f6988e0e 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -265,7 +265,7 @@ static SV *perl_process_callchain(struct perf_sample *sample,
if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
sample, NULL, NULL,
- PERF_MAX_STACK_DEPTH) != 0) {
+ sysctl_perf_event_max_stack) != 0) {
pr_err("Failed to resolve callchain. Skipping\n");
goto exit;
}