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
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