| From | Adrian Hunter <> | Subject | [PATCH V2 08/14] perf evlist: Add a debug print if event buffer mmap fails | Date | Tue, 22 Oct 2013 10:34:12 +0300 |
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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 | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 85c4c80..4bc2a3a 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -600,6 +600,8 @@ 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, error %d\n", + errno); evlist->mmap[idx].base = NULL; return -1; } -- 1.7.11.7
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