linux-kernel - Re: perf stat branch: perf stat fails on unsupported event

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Date:	Fri, 29 Apr 2011 16:11:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Ahern <dsahern@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: perf stat branch: perf stat fails on unsupported event


* David Ahern <dsahern@...il.com> wrote:

> Tried the perf stat branch this morning. perf stat fails with:
> 
> # /tmp/build-perf/perf stat -- sleep 1
>   Error: stalled-cycles-frontend event is not supported.
>   Fatal: Not all events could be opened.
> 
> This is a Dell R410 with an E5620 processor.

Does the patch below allow the other events to be counted?

Thanks,

	Ingo

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9e596ab..c11ec76 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -377,7 +377,7 @@ static int run_perf_stat(int argc __used, const char **argv)
 
 	list_for_each_entry(counter, &evsel_list->entries, node) {
 		if (create_perf_stat_counter(counter) < 0) {
-			if (errno == EINVAL || errno == ENOSYS)
+			if (errno == EINVAL || errno == ENOSYS || errno = ENOENT)
 				continue;
 
 			if (errno == EPERM || errno == EACCES) {
@@ -385,8 +385,6 @@ 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",
--
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