linux-kernel - Re: quicklists confuse meminfo

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Message-ID: <87ve3w9ka6.fsf@saeurebad.de>
Date:	Sun, 09 Mar 2008 13:03:29 +0100
From:	Johannes Weiner <hannes@...urebad.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: quicklists confuse meminfo

Hi,

Ingo Molnar <mingo@...e.hu> writes:

> hm. I think we should not let this much RAM hang around in a 
> special-purpose allocator like quicklists. Shouldnt the quicklists be 
> temporary in nature, and be trimmed much more agressively?
>
> in fact, we have a check_pgt_cache() call in cpu_idle(), which does:
>
>         quicklist_trim(0, pgd_dtor, 25, 16);
>
> but it appears we dont do quicklist trimming anywhere else! So if a 
> system has no idle time, the quicklist can grow unbounded, and that's a 
> real memory leak IMO.

It is also called from tlbu_finish_mmu().

	Hannes
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