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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
Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/tests/hists_cumulate.c
View File

@@ -101,7 +101,7 @@ static int add_hist_entries(struct hists *hists, struct machine *machine)
if (machine__resolve(machine, &al, &sample) < 0)
goto out;
if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,
if (hist_entry_iter__add(&iter, &al, sysctl_perf_event_max_stack,
NULL) < 0) {
addr_location__put(&al);
goto out;

2
tools/perf/tests/hists_filter.c
View File

@@ -81,7 +81,7 @@ static int add_hist_entries(struct perf_evlist *evlist,
al.socket = fake_samples[i].socket;
if (hist_entry_iter__add(&iter, &al,
PERF_MAX_STACK_DEPTH, NULL) < 0) {
sysctl_perf_event_max_stack, NULL) < 0) {
addr_location__put(&al);
goto out;
}

2
tools/perf/tests/hists_output.c
View File

@@ -67,7 +67,7 @@ static int add_hist_entries(struct hists *hists, struct machine *machine)
if (machine__resolve(machine, &al, &sample) < 0)
goto out;
if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,
if (hist_entry_iter__add(&iter, &al, sysctl_perf_event_max_stack,
NULL) < 0) {
addr_location__put(&al);
goto out;