linux-kernel - Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core)

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Date:	Mon, 21 Aug 2006 14:43:45 +0400
From:	Kirill Korotaev <dev@...ru>
To:	rohitseth@...gle.com
CC:	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Rik van Riel <riel@...hat.com>, hugh@...itas.com,
	ckrm-tech@...ts.sourceforge.net, Andi Kleen <ak@...e.de>
Subject: Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core)

>>1. reclaiming user resources is not that good idea as it looks to you.
>>such solutions end up with lots of resources spent on reclaim.
>>for user memory reclaims mean consumption of expensive disk I/O bandwidth
>>which reduces overall system throughput and influences other users.
>>
> 
> 
> May be I'm overlooking something very obvious.  Please tell me, what
> happens when a user hits a page fault and the page allocator is easily
> able to give a page from its pcp list.  But container is over its limit
> of physical memory.  In your patch there is no attempt by container
> support to see if some of the user pages are easily reclaimable.  What
> options a user will have to make sure some room is created.
The patch set send doesn't control user memory!
This topic is about kernel memory...

>>2. kernel memory is mostly not reclaimable. can you reclaim vma structs or ipc ids?
> 
> 
> I'm not arguing about that at all.  If people want to talk about
> reclaiming kernel pages then that should be done independent of this
> subject.
Then why do you mess user pages accounting into this thread then?

Kirill

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