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Subject[PATCH V2 08/14] perf evlist: Add a debug print if event buffer mmap fails
Date
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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