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| author | David Ahern <daahern@cisco.com> | 2011-03-25 13:11:11 -0600 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-03-29 13:40:27 -0300 |
| commit | ca6a42586fae639ff9e5285d9bdc550fcb1b8d41 (patch) | |
| tree | 0eeb89ae0aaf2654ca3dbdc8d8057b97fef69545 /tools/perf/builtin-top.c | |
| parent | c286c419c784c238cd699be37fec7a9acc30d89f (diff) | |
| download | linux-3.10-ca6a42586fae639ff9e5285d9bdc550fcb1b8d41.tar.gz linux-3.10-ca6a42586fae639ff9e5285d9bdc550fcb1b8d41.tar.bz2 linux-3.10-ca6a42586fae639ff9e5285d9bdc550fcb1b8d41.zip | |
perf tools: Emit clearer message for sys_perf_event_open ENOENT return
Resend of patch sent back in January 2011 in light of recent confusion around
unsupported events for a given platform.
Improve sys_perf_event_open ENOENT return handling in top and record, just
like 5a3446b does for stat.
Retry of Arnaldo's patch using ui_warning instead of die which allows the
fallback from hardware cycles to software clock.
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
LKML-Reference: <1301080271-20945-1-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
[ committer note: Some adjustments to make it apply to newer codebase ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-top.c')
| -rw-r--r-- | tools/perf/builtin-top.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 935fc4fd878..fc1273e976c 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -870,6 +870,12 @@ try_again: goto try_again; } + if (err == ENOENT) { + ui__warning("The %s event is not supported.\n", + event_name(counter)); + goto out_err; + } + ui__warning("The sys_perf_event_open() syscall " "returned with %d (%s). /bin/dmesg " "may provide additional information.\n" |