[PATCH V3 05/11] perf evlist: Add a debug print if event buffer mmap fails

[Adrian Hunter]

Add a debug print if mmap of the perf event
ring buffer fails.

Signed-off-by: Adrian Hunter <adrian.hun...@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 0582f67..1c173cc 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -607,6 +607,8 @@ 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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