diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-15 22:52:34 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-15 22:52:34 +0200 |
| commit | f3e459d16a8493b617ccf2a940330279679e0291 (patch) | |
| tree | c6cc841dcb256d0ea77b0ab56b05fe0b344e4aab /tools/perf/builtin-trace.c | |
| parent | perf evlist: Expose perf_event_mlock_kb_in_pages() helper (diff) | |
| download | linux-f3e459d16a8493b617ccf2a940330279679e0291.tar.xz linux-f3e459d16a8493b617ccf2a940330279679e0291.zip | |
perf trace: Bump --mmap-pages when --call-graph is used by the root user
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>
Diffstat (limited to 'tools/perf/builtin-trace.c')
| -rw-r--r-- | tools/perf/builtin-trace.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 19f5100acc1d..026ec0c749b0 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -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); |