linux-kernel - Re: [PATCH] introduce get_mm_hiwater_xxx(), fix taskstats->hiwater

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Message-ID: <20081207173958.GC13333@balbir.in.ibm.com>
Date:	Sun, 7 Dec 2008 23:09:58 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Hugh Dickins <hugh@...itas.com>, Jay Lan <jlan@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Pirko <jpirko@...hat.com>, linux-kernel@...r.kernel.org,
	Jonathan Lim <jlim@....com>
Subject: Re: [PATCH] introduce get_mm_hiwater_xxx(), fix
	taskstats->hiwater_xxx accounting

* Oleg Nesterov <oleg@...hat.com> [2008-12-07 18:28:45]:

[snip]

> No. When the task does unmap, vm does update_hiwater_vm() "internally",
> it does not need the help from do_exit(). And do_exit() can't help,
> it is to late to calculate the maximum, ->total_vm was already decreased.
> 
> do_exit() itself does not affect rss/vm. Until we call exit_mmap(),
> but at this point ->mm is dead, nobody can look at it, its ->mm_users
> is zero.
>

OK, I think that makes sense, since free would have cleaned up the
memory before entering the exit system call.

[snip] 

-- 
	Balbir
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