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

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Message-Id: <20100721223359.8710.A69D9226@jp.fujitsu.com>
Date:	Wed, 21 Jul 2010 22:34:12 +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

> 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.


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