Re: [GIT PULL 0/5] perf/urgent fixes

[Ingo Molnar]

Hm, after this pull request, 'perf top' started misbehaving on older 
kernels:
             
             ââError:âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ
             âThe sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (cycles).  â
             â/bin/dmesg may provide additional information.                                             â
             âNo CONFIG_PERF_EVENTS=y kernel support configured?                                         â

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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