linux-kernel - Re: [PATCH] perf: disable mmap2 support

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Message-ID: <52558278.6080206@gmail.com>
Date:	Wed, 09 Oct 2013 10:21:12 -0600
From:	David Ahern <dsahern@...il.com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	linux-kernel@...r.kernel.org, mingo@...e.hu, peterz@...radead.org,
	acme@...hat.com, ak@...ux.intel.com, jolsa@...hat.com,
	hughd@...gle.com, keescook@...omium.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] perf: disable mmap2 support

On 10/9/13 10:17 AM, Stephane Eranian wrote:
>
> This patch disables the mmap2 record format support
> for now. The support needs a bit more work to cover
> VM_CLONE cases.
>
> The patch leaves attr->mmap2 defined, but returns
> an error if it is set. That ensures no PERF_RECORD_MMAP2
> record can be generated. Yet it minimizes the reverts in
> the perf tool.

The userspace code generates MMAP2 events for synthesized mmap events. 
That should be reverted to MMAP until the format of MMAP2 events is 
finalized.

David
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