From 026359658aecd348bc5c4a136a26f204b169103b Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Fri, 1 Nov 2013 15:51:33 +0200 Subject: [PATCH] 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 Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mike Galbraith Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1383313899-15987-6-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- 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 0582f67fbefc..1c173ccb0ef2 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; } -- GitLab