Messages in this thread Patch in this message | | | Date | Tue, 23 Jul 2013 00:46:50 -0700 | From | tip-bot for David Ahern <> | Subject | [tip:perf/core] perf evsel: Handle ENODEV on default cycles event |
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Commit-ID: 2b821cce1c950cead081d779db0dda680192c4bd Gitweb: http://git.kernel.org/tip/2b821cce1c950cead081d779db0dda680192c4bd Author: David Ahern <dsahern@gmail.com> AuthorDate: Thu, 18 Jul 2013 17:27:59 -0600 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Mon, 22 Jul 2013 12:03:57 -0300
perf evsel: Handle ENODEV on default cycles event
Some systems (e.g., VMs on qemu-0.13 with the default vcpu model) report an unsupported CPU model:
Performance Events: unsupported p6 CPU model 2 no PMU driver, software events only.
Subsequent invocations of perf fail with:
The sys_perf_event_open() syscall returned with 19 (No such device) for event (cycles). /bin/dmesg may provide additional information. No CONFIG_PERF_EVENTS=y kernel support configured?
Add ENODEV to the list of errno's to fallback to cpu-clock.
Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1374190079-28507-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/evsel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index a635461..8bed0c1 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1482,7 +1482,7 @@ out: bool perf_evsel__fallback(struct perf_evsel *evsel, int err, char *msg, size_t msgsize) { - if ((err == ENOENT || err == ENXIO) && + if ((err == ENOENT || err == ENXIO || err == ENODEV) && evsel->attr.type == PERF_TYPE_HARDWARE && evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) { /*
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