perf evsel: Handle ENOMEM for perf_event_max_stack + PERF_SAMPLE_CALLCHAIN

When the kernel allows tweaking perf_event_max_stack and the event being
setup has PERF_SAMPLE_CALLCHAIN in its perf_event_attr.sample_type, tell
the user that tweaking /proc/sys/kernel/perf_event_max_stack may solve
the problem.

Before:

  # echo 32000 > /proc/sys/kernel/perf_event_max_stack
  # perf record -g usleep 1
  Error:
  The sys_perf_event_open() syscall returned with 12 (Cannot allocate memory) for event (cycles:ppp).
  /bin/dmesg may provide additional information.
  No CONFIG_PERF_EVENTS=y kernel support configured?

  #

After:

  # echo 64000 > /proc/sys/kernel/perf_event_max_stack
  # perf record -g usleep 1
  Error:
  Not enough memory to setup event with callchain.
  Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack
  Hint: Current value: 64000
  #

Suggested-by: David Ahern <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Brendan Gregg <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Milian Wolff <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 334364e25bbe851c375ba8db00663fa9dd29acf9..9bed7f4419d8d5d919c41bacf8f0f6bbd845a333 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2325,6 +2325,14 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
                         "Probably the maximum number of open file descriptors has been reached.\n"
                         "Hint: Try again after reducing the number of events.\n"
                         "Hint: Try increasing the limit with 'ulimit -n <limit>'");
+       case ENOMEM:
+               if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
+                   access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
+                       return scnprintf(msg, size,
+                                        "Not enough memory to setup event with callchain.\n"
+                                        "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
+                                        "Hint: Current value: %d", sysctl_perf_event_max_stack);
+               break;
        case ENODEV:
                if (target->cpu_list)
                        return scnprintf(msg, size, "%s",