linux-kernel - Re: [PATCH] fs, proc: Add start_data, end_data, start

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Message-Id: <20111207090259.e2296dd3.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 7 Dec 2011 09:02:59 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Kees Cook <keescook@...omium.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs, proc: Add start_data, end_data, start_brk members
 to /proc/$pid/stat v2

On Wed, 7 Dec 2011 02:53:15 +0400
Cyrill Gorcunov <gorcunov@...il.com> wrote:
 
> Index: linux-2.6.git/Documentation/filesystems/proc.txt
> ===================================================================
> --- linux-2.6.git.orig/Documentation/filesystems/proc.txt
> +++ linux-2.6.git/Documentation/filesystems/proc.txt
> @@ -305,6 +305,9 @@ Table 1-4: Contents of the stat files (a
>    blkio_ticks   time spent waiting for block IO
>    gtime         guest time of the task in jiffies
>    cgtime        guest time of the task children in jiffies
> +  start_data    address above which program data is placed
> +  end_data      address above which program data is placed
> +  start_brk     address above which program data can be expanded with brk() call
>  ..............................................................................
> 
nitpick.

After reading Wikipedia, http://en.wikipedia.org/wiki/Data_segment

I prefer

start_data   address above program data+bss is placed.
end_data     address below program data+bss is placed
start_break  address above which program heap can be expaned with brk() call

rather than just 'data'. 

Thanks,
-Kame

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