Message-ID: <52558278.6080206@gmail.com>
Date: Wed, 09 Oct 2013 10:21:12 -0600
From: David Ahern <dsahern@gmail.com>
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To: Stephane Eranian <eranian@google.com>
CC: linux-kernel@vger.kernel.org, mingo@elte.hu, peterz@infradead.org,
        acme@redhat.com, ak@linux.intel.com, jolsa@redhat.com,
        hughd@google.com, keescook@chromium.org, akpm@linux-foundation.org
Subject: Re: [PATCH] perf: disable mmap2 support
References: <20131009161743.GA3022@quad>
In-Reply-To: <20131009161743.GA3022@quad>
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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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