| Date | Sun, 20 Oct 2013 22:43:35 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCH 14/19] perf evlist: Add a debug print if event buffer mmap fails |
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On Fri, Oct 18, 2013 at 03:29:11PM +0300, Adrian Hunter wrote: > Add a debug print if mmap of the perf event > ring buffer fails. > > Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> > --- > tools/perf/util/evlist.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c > index 07ba0a4..52e434a 100644 > --- a/tools/perf/util/evlist.c > +++ b/tools/perf/util/evlist.c > @@ -600,6 +600,7 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, > evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot, > MAP_SHARED, fd, 0); > if (evlist->mmap[idx].base == MAP_FAILED) { > + pr_debug2("failed to mmap perf event ring buffer\n");
while at it, we could display errno
jirka
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