Em Thu, Jun 11, 2015 at 02:32:40AM -0400, [email protected] escreveu:
> perf stat ignores the unsupported event and continue to count supported
> event. But if the unsupported event is group leader, perf tool will
> crash. After applying this patch, the unsupported group leader will
> error out immediately.
> Without this patch:
> $ perf stat -x, -e '{node-prefetch-refs,cycles}' -- sleep 1
> perf: util/evsel.c:1009: get_group_fd: Assertion `!(fd == -1)' failed.
> Aborted (core dumped)
> With this patch:
> $ perf stat -x, -e '{node-prefetch-refs,cycles}' -- sleep 1
> Error:
> The node-prefetch-refs event is not supported.
I get something different, maybe I am missing a patch?
With this patch:
[acme@zoo linux]$ perf stat -x, -e '{node-prefetch-refs,cycles}' -- sleep 1
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument)
for event (node-prefetch-refs).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?
[acme@zoo linux]$
Applying it anyway, as it avoids a core dump and the message, albeit not
optimal, points to a problem with that event.
Have you tried this with other tools, like perf record?
- Arnaldo
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