* [PATCH] perf list: Show error if tracepoints not available
@ 2013-10-15 20:07 Pekka Enberg
2013-10-23 7:54 ` [tip:perf/core] " tip-bot for Pekka Enberg
0 siblings, 1 reply; 2+ messages in thread
From: Pekka Enberg @ 2013-10-15 20:07 UTC (permalink / raw)
To: linux-kernel; +Cc: Pekka Enberg, Arnaldo Carvalho de Melo, Ingo Molnar
Tracepoints are not visible in "perf list" on Fedora 19 because regular
users have no permission to /sys/kernel/debug by default. Show an error
message so that the user knows about it instead of assuming that
tracepoints are not supported on the system.
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
tools/perf/util/parse-events.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9812531..c90e55c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -998,8 +998,10 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
char evt_path[MAXPATHLEN];
char dir_path[MAXPATHLEN];
- if (debugfs_valid_mountpoint(tracing_events_path))
+ if (debugfs_valid_mountpoint(tracing_events_path)) {
+ printf(" [ Tracepoints not available: %s ]\n", strerror(errno));
return;
+ }
sys_dir = opendir(tracing_events_path);
if (!sys_dir)
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [tip:perf/core] perf list: Show error if tracepoints not available
2013-10-15 20:07 [PATCH] perf list: Show error if tracepoints not available Pekka Enberg
@ 2013-10-23 7:54 ` tip-bot for Pekka Enberg
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Pekka Enberg @ 2013-10-23 7:54 UTC (permalink / raw)
To: linux-tip-commits; +Cc: acme, linux-kernel, hpa, mingo, penberg, tglx
Commit-ID: f11cfc6f294dbd83b0d58037404df2bd16066238
Gitweb: http://git.kernel.org/tip/f11cfc6f294dbd83b0d58037404df2bd16066238
Author: Pekka Enberg <penberg@kernel.org>
AuthorDate: Tue, 15 Oct 2013 23:07:27 +0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Oct 2013 17:33:22 -0300
perf list: Show error if tracepoints not available
Tracepoints are not visible in "perf list" on Fedora 19 because regular
users have no permission to /sys/kernel/debug by default. Show an error
message so that the user knows about it instead of assuming that
tracepoints are not supported on the system.
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1381867647-8594-1-git-send-email-penberg@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/parse-events.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9812531..c90e55c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -998,8 +998,10 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
char evt_path[MAXPATHLEN];
char dir_path[MAXPATHLEN];
- if (debugfs_valid_mountpoint(tracing_events_path))
+ if (debugfs_valid_mountpoint(tracing_events_path)) {
+ printf(" [ Tracepoints not available: %s ]\n", strerror(errno));
return;
+ }
sys_dir = opendir(tracing_events_path);
if (!sys_dir)
^ permalink raw reply related [flat|nested] 2+ messages in thread
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