linux-kernel - Re: [PATCH] RSS container, fix freeing of active pages

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Message-ID: <4631DBB2.6090202@linux.vnet.ibm.com>
Date:	Fri, 27 Apr 2007 16:47:06 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Pavel Emelianov <xemul@...ru>
CC:	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RSS container, fix freeing of active pages

Pavel Emelianov wrote:

> Hm... Did you see such a situation in your experiments?

Yes, we did. We saw a bad_page() error on the console. A page
was freed with the active bit set.

> If yes, then why not fix it in a normal way by moving the 
> pages from list to list where appropriate?
> 

If we add the pages to the appropriate list at the time of page_add_*rmap(),
we would end up with too many code changes split
all over the place. In many cases when we add a page (install_page()
for example), we just release any existing mapping. We would not know
where to add the page -- active list or inactive list?

I am not sure if that was your question in the first place :-)

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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