path: root/tools/perf
diff options
authorDavid Ahern <daahern@cisco.com>2011-03-25 13:11:11 -0600
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-03-29 13:40:27 -0300
commitca6a42586fae639ff9e5285d9bdc550fcb1b8d41 (patch)
tree0eeb89ae0aaf2654ca3dbdc8d8057b97fef69545 /tools/perf
parentc286c419c784c238cd699be37fec7a9acc30d89f (diff)
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')
2 files changed, 15 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 623695e1825..db6adecf46f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -301,11 +301,19 @@ try_again:
&& attr->config == PERF_COUNT_HW_CPU_CYCLES) {
if (verbose)
- warning(" ... trying to fall back to cpu-clock-ticks\n");
+ ui__warning("The cycles event is not supported, "
+ "trying to fall back to cpu-clock-ticks\n");
attr->type = PERF_TYPE_SOFTWARE;
attr->config = PERF_COUNT_SW_CPU_CLOCK;
goto try_again;
+ if (err == ENOENT) {
+ ui__warning("The %s event is not supported.\n",
+ event_name(pos));
+ }
error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n",
err, strerror(err));
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"