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authorDavid Ahern <daahern@cisco.com>2011-01-09 11:21:12 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-01-10 11:34:53 -0200
commit5a3446bc648d86a99a895e93d28d7df00bbbfb3c (patch)
treebc292838c295c6ce6918e485a0454d9a0f1f51f2 /tools
parente462dc553ea5e09d4713e7c35a11ed331dc6f369 (diff)
downloadlinux-2.6.38-lt-ux500-5a3446bc648d86a99a895e93d28d7df00bbbfb3c.tar.gz
perf stat: better error message for unsupported events
For unsupported events (e.g., H/W events when running in a VM) perf stat currently fails with the error message: Error: open_counter returned with 2 (No such file or directory). /bin/dmesg may provide additional information. Fatal: Not all events could be opened. dmesg is of no help and it is not clear as to why it fails to open the counter. This patch changes the error message to Error: cache-misses event is not supported. Fatal: Not all events could be opened. Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: a.p.zijlstra@chello.nl LPU-Reference: <1294597272-17335-1-git-send-email-daahern@cisco.com> Signed-off-by: David Ahern <daahern@cisco.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-stat.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 2dfcb613e66..c385a63ebfd 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -316,6 +316,8 @@ static int run_perf_stat(int argc __used, const char **argv)
"\t Consider tweaking"
" /proc/sys/kernel/perf_event_paranoid or running as root.",
system_wide ? "system-wide " : "");
+ } else if (errno == ENOENT) {
+ error("%s event is not supported. ", event_name(counter));
} else {
error("open_counter returned with %d (%s). "
"/bin/dmesg may provide additional information.\n",