linux-kernel - Re: perf MMAP2 interface and COW faults

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Message-ID: <20140314133748.GY25953@redhat.com>
Date:	Fri, 14 Mar 2014 09:37:48 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	eranian@...gle.com, jmario@...hat.com, jolsa@...hat.com,
	acme@...hat.com, linux-kernel@...r.kernel.org, lwoodman@...hat.com
Subject: Re: perf MMAP2 interface and COW faults

On Fri, Mar 14, 2014 at 02:24:47PM +0100, Peter Zijlstra wrote:
> On Fri, Mar 14, 2014 at 08:58:37AM -0400, Don Zickus wrote:
> > Hmmm.  That will probably work for future mmap events.  My problem is for
> > synthesized mmap events.  We read the same protection bits from
> > /proc/<pid>/maps file, so I assume the same strategy can work for those
> > events too?
> 
> Yeah, so /proc/$pid/maps doesn't contain all those bits, but it does
> have the prot read/write/exec and flags shared/private thing, which
> should be sufficient for your needs.

Great, thanks!

Cheers,
Don

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