linux-kernel - Re: tracking memory usage/leak in "inactive" field in /proc/meminfo?

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Message-ID: <4B7B1AA9.9040609@redhat.com>
Date:	Tue, 16 Feb 2010 17:22:33 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Chris Friesen <cfriesen@...tel.com>
CC:	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: tracking memory usage/leak in "inactive" field in /proc/meminfo?

On 02/16/2010 04:26 PM, Chris Friesen wrote:

> For the backtrace scenario I posted it seems like it might actually be
> release_pages().  There seems to be a plausible call chain:
>
> __ClearPageLRU
> release_pages
> free_pages_and_swap_cache
> tlb_flush_mmu
> tlb_remove_page
> zap_pte_range
>
> Does that seem right?  In this case, tlb_remove_page() is called right
> after page_remove_rmap() which ultimately results in clearing the
> PageAnon bit.

That is right - and pinpoints the fault for the memory leak
on some third party code that fails to release a refcount on
memory pages.

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