Commit-ID: 18ffdfe8e98f861a39590ef2374ad51fc963567e Gitweb: http://git.kernel.org/tip/18ffdfe8e98f861a39590ef2374ad51fc963567e Author: Jiri Olsa <jolsa@xxxxxxxxxx> AuthorDate: Mon, 25 May 2015 22:51:54 +0200 Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> CommitDate: Wed, 27 May 2015 20:28:37 -0300 perf tools: Add hint for 'Too many events are opened.' error message Enhancing the 'Too many events are opened.' error message with hint to use use 'ulimit -n <limit>' command. Before: $ perf record -e 'sched:*,syscalls:*' ls Error: Too many events are opened. Try again after reducing the number of events. Now: $ perf record -e 'sched:*,syscalls:*' ls Error: Too many events are opened. Probably the maximum number of open file descriptors has been reached. Hint: Try again after reducing the number of events. Hint: Try increasing the limit with 'ulimit -n <limit>' Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: David Ahern <dsahern@xxxxxxxxx> Cc: Michael Petlan <mpetlan@xxxxxxxxxx> Cc: Namhyung Kim <namhyung@xxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Link: http://lkml.kernel.org/r/1432587114-14924-1-git-send-email-jolsa@xxxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> --- tools/perf/util/evsel.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index c886b9f..a3e36fc 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -2149,7 +2149,9 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target, case EMFILE: return scnprintf(msg, size, "%s", "Too many events are opened.\n" - "Try again after reducing the number of events."); + "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 ENODEV: if (target->cpu_list) return scnprintf(msg, size, "%s", -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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