Messages in this thread | | | Date | Wed, 11 Sep 2013 07:55:03 +0200 | From | Ingo Molnar <> | Subject | Re: [GIT PULL 0/5] perf/urgent fixes |
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Hm, after this pull request, 'perf top' started misbehaving on older kernels:
┌─Error:────────────────────────────────────────────────────────────────────────────────────┐ │The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (cycles). │ │/bin/dmesg may provide additional information. │ │No CONFIG_PERF_EVENTS=y kernel support configured? │
But:
$ cat /proc/sys/kernel/perf_event_paranoid -1
The syscall really fails:
16645 perf_event_open(0x1eb7f00, 0xffffffff, 0, 0xffffffff, 0) = -1 EINVAL (Invalid argument) 16645 perf_event_open(0x1eb7f00, 0xffffffff, 0, 0xffffffff, 0) = -1 EINVAL (Invalid argument) 16645 perf_event_open(0x1eb7f00, 0xffffffff, 0, 0xffffffff, 0) = -1 EINVAL (Invalid argument)
Caused by:
575a9aab0f85 perf tools: Add attr->mmap2 support
We must not force mmap2 support to be present on the kernel side - new perf top should work on older kernels just as well.
So I've unpulled the tree for now.
Thanks,
Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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