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perf evlist: Add a debug print if event buffer mmap fails
Add a debug print if mmap of the perf event ring buffer fails. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1383313899-15987-6-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -607,6 +607,8 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
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evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
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MAP_SHARED, fd, 0);
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if (evlist->mmap[idx].base == MAP_FAILED) {
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pr_debug2("failed to mmap perf event ring buffer, error %d\n",
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errno);
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evlist->mmap[idx].base = NULL;
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return -1;
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}
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