From: Christoph Hellwig <hch@infradead.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Eric B Munson <ebmunson@us.ibm.com>,
Eric B Munson <emunson@mgebm.net>,
akpm@linux-foundation.org, mingo@redhat.com,
hugh.dickins@tiscali.co.uk, riel@redhat.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
anton@samba.org
Subject: Re: [PATCH] Add trace event for munmap
Date: Thu, 8 Jul 2010 13:51:48 -0400 [thread overview]
Message-ID: <20100708175147.GA17525@infradead.org> (raw)
In-Reply-To: <1278611288.1900.164.camel@laptop>
On Thu, Jul 08, 2010 at 07:48:08PM +0200, Peter Zijlstra wrote:
> 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.
Maybe the user reporting should use trace points everywhere, leaving
the direct hook just for the executable tracking?
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Eric B Munson <ebmunson@us.ibm.com>,
Eric B Munson <emunson@mgebm.net>,
akpm@linux-foundation.org, mingo@redhat.com,
hugh.dickins@tiscali.co.uk, riel@redhat.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
anton@samba.org
Subject: Re: [PATCH] Add trace event for munmap
Date: Thu, 8 Jul 2010 13:51:48 -0400 [thread overview]
Message-ID: <20100708175147.GA17525@infradead.org> (raw)
In-Reply-To: <1278611288.1900.164.camel@laptop>
On Thu, Jul 08, 2010 at 07:48:08PM +0200, Peter Zijlstra wrote:
> 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.
Maybe the user reporting should use trace points everywhere, leaving
the direct hook just for the executable tracking?
--
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next prev parent reply other threads:[~2010-07-08 17:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-08 14:05 [PATCH] Add trace event for munmap Eric B Munson
2010-07-08 14:05 ` Eric B Munson
2010-07-08 14:15 ` Rik van Riel
2010-07-08 14:15 ` Rik van Riel
2010-07-08 14:22 ` Peter Zijlstra
2010-07-08 14:22 ` Peter Zijlstra
2010-07-08 14:44 ` Eric B Munson
2010-07-08 17:35 ` Christoph Hellwig
2010-07-08 17:35 ` Christoph Hellwig
2010-07-08 17:48 ` Peter Zijlstra
2010-07-08 17:48 ` Peter Zijlstra
2010-07-08 17:51 ` Christoph Hellwig [this message]
2010-07-08 17:51 ` Christoph Hellwig
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