linux-kernel - Re: Kernel falls apart under light memory pressure (i.e. linking vmlinux)

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Message-ID: <4DD5DC06.6010204@jp.fujitsu.com>
Date:	Fri, 20 May 2011 12:12:06 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	luto@....edu
CC:	minchan.kim@...il.com, kamezawa.hiroyu@...fujitsu.com,
	fengguang.wu@...el.com, andi@...stfloor.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, hannes@...xchg.org,
	riel@...hat.com
Subject: Re: Kernel falls apart under light memory pressure (i.e. linking
 vmlinux)

> Right after that happened, I hit ctrl-c to kill test_mempressure.sh.
> The system was OK until I typed sync, and then everything hung.
>
> I'm really confused.  shrink_inactive_list in
> RECLAIM_MODE_LUMPYRECLAIM will call one of the isolate_pages functions
> with ISOLATE_BOTH.  The resulting list goes into shrink_page_list,
> which does VM_BUG_ON(PageActive(page)).
>
> How is that supposed to work?

Usually clear_active_flags() clear PG_active before calling shrink_page_list().

shrink_inactive_list()
     isolate_pages_global()
     update_isolated_counts()
         clear_active_flags()
     shrink_page_list()



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