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perf trace: Bump --mmap-pages when --call-graph is used by the root user

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To reduce the chances we'll overflow the mmap buffer, manual fine tuning
trumps this.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@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-wxygbxmp1v9mng1ea28wet02@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2016-04-15 17:52:34 -03:00
parent f5e7150cd9
commit f3e459d16a
2 changed files with 13 additions and 1 deletions
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10
tools/perf/builtin-trace.c
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@@ -3110,6 +3110,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_END()
};
bool max_stack_user_set = true;
bool mmap_pages_user_set = true;
const char * const trace_subcommands[] = { "record", NULL };
int err;
char bf[BUFSIZ];
@@ -3143,6 +3144,9 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
trace.opts.sample_time = true;
}
if (trace.opts.mmap_pages == UINT_MAX)
mmap_pages_user_set = false;
if (trace.max_stack == UINT_MAX) {
trace.max_stack = PERF_MAX_STACK_DEPTH;
max_stack_user_set = false;
@@ -3153,8 +3157,12 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
record_opts__parse_callchain(&trace.opts, &callchain_param, "dwarf", false);
#endif
if (trace.opts.callgraph_set)
if (trace.opts.callgraph_set) {
if (!mmap_pages_user_set && geteuid() == 0)
trace.opts.mmap_pages = perf_event_mlock_kb_in_pages() * 4;
symbol_conf.use_callchain = true;
}
if (trace.evlist->nr_entries > 0)
evlist__set_evsel_handler(trace.evlist, trace__event_handler);