linux-kernel - Re: [PATCH] Add trace event for munmap

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Date:	Thu, 08 Jul 2010 19:48:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Eric B Munson <ebmunson@...ibm.com>,
	Eric B Munson <emunson@...bm.net>, akpm@...ux-foundation.org,
	mingo@...hat.com, hugh.dickins@...cali.co.uk, riel@...hat.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, anton@...ba.org
Subject: Re: [PATCH] Add trace event for munmap

On Thu, 2010-07-08 at 13:35 -0400, Christoph Hellwig wrote:

> What kind of infrastructure is perf using for recording
> mmap()/mremap()/brk() information?

A direct hook into mmap_region(), see perf_event_mmap().

We used to only track VM_EXEC regions, but these days we can also track
data regions (although it wouldn't track mremap and brk I think).

We need the VM_EXEC maps to make sense of the instruction pointer
samples.

Eric recently added support for !VM_EXEC mmap() in order to interpret
linear addresses provided by things like the software pagefault events
and certain powerpc hardware events.

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