linux-kernel - Re: [PATCH 1/2] Add trace points to mmap, munmap, and brk

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Message-Id: <20100727201644.2F46.A69D9226@jp.fujitsu.com>
Date:	Tue, 27 Jul 2010 20:17:02 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Eric B Munson <emunson@...bm.net>
Cc:	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	mingo@...hat.com, hugh.dickins@...cali.co.uk, riel@...hat.com,
	peterz@...radead.org, anton@...ba.org, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] Add trace points to mmap, munmap, and brk

> On Wed, 21 Jul 2010, KOSAKI Motohiro wrote:
> 
> > > This patch adds trace points to mmap, munmap, and brk that will report
> > > relevant addresses and sizes before each function exits successfully.
> > > 
> > > Signed-off-by: Eric B Munson <emunson@...bm.net>
> > 
> > I don't think this is good idea. if you need syscall result, you should 
> > use syscall tracer. IOW, This tracepoint bring zero information.
> > 
> > Please see perf_event_mmap() usage. Our kernel manage adress space by
> > vm_area_struct. we need to trace it if we need to know what kernel does.
> > 
> > Thanks.
> 
> The syscall tracer does not give you the address and size of the mmaped areas
> so this does provide information above simply tracing the enter/exit points
> for each call.

Why don't you fix this?



> perf_event_mmap does provide the information for mmap calls.  Originally I sent
> a patch to add a trace point to munmap and Peter Z asked for corresponding points
> in the mmap family.  If the consensus is that the trace point in munmap is the
> only one that should be added I can resend that patch.
> 
> -- 
> Eric B Munson
> IBM Linux Technology Center
> ebmunson@...ibm.com
> 



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