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

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Date:	Wed, 11 Sep 2013 07:55:03 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Jiri Olsa <jolsa@...hat.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 0/5] perf/urgent fixes


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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