linux-kernel - Re: [PATCH 7/8] Scanner changes needed to implement per-container scanner

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Message-ID: <465FCCDB.5060008@linux.vnet.ibm.com>
Date:	Fri, 01 Jun 2007 13:08:03 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Pavel Emelianov <xemul@...nvz.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, Kirill Korotaev <dev@...nvz.org>
Subject: Re: [PATCH 7/8] Scanner changes needed to implement per-container
 scanner

Pavel Emelianov wrote:
> Balbir Singh wrote:
>> Andrew Morton wrote:
>>>> +		nr_reclaimed += shrink_zones(priority, zones, sc);
>>>> +		if (sc->cnt == NULL)
>>>> +			shrink_slab(sc->nr_scanned, gfp_mask, lru_pages);
>>> We don't we shrink slab if called to shrink a container.
>>>
>>> This is a fundamental design decision, and a design shortcoming.  A full
>>> discussion of this is absolutely appropriate to the patch changelog. 
>>> Please don't just hide stuff like this in the patch and leave people
>>> wondering, or ignorant.
>> Yes, we don't because we do not account for slab usage right now. We account
>> only for memory allocated to user space. A good fat comment will help here.
>>
>>
> 
> I have already added the comment. But the problem is not in that we
> do not account for kernel memory. Shrinking slabs won't unmap any
> pages from user-space and thus won't help user to charge more. This
> will only make kernel suffer from re-creation of objects.

I meant the same thing. Thanks for adding the comment.

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