linux-kernel - Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

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Message-Id: <1156219087.21411.89.camel@localhost>
Date:	Tue, 22 Aug 2006 12:58:07 +0900
From:	Magnus Damm <magnus@...inux.co.jp>
To:	rohitseth@...gle.com
Cc:	Rik van Riel <riel@...hat.com>, ckrm-tech@...ts.sourceforge.net,
	Dave Hansen <haveblue@...ibm.com>, Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	hugh@...itas.com, Ingo Molnar <mingo@...e.hu>,
	Kirill Korotaev <dev@...ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

On Mon, 2006-08-21 at 18:16 -0700, Rohit Seth wrote:
> On Mon, 2006-08-21 at 11:47 +0900, Magnus Damm wrote:
> > On Fri, 2006-08-18 at 07:45 -0700, Dave Hansen wrote:
> > > On Fri, 2006-08-18 at 12:08 +0400, Andrey Savochkin wrote:
> > > > 
> > > > A) Have separate memory management for each container,
> > > >    with separate buddy allocator, lru lists, page replacement mechanism.
> > > >    That implies a considerable overhead, and the main challenge there
> > > >    is sharing of pages between these separate memory managers.
> > > 
> > > Hold on here for just a sec...
> > > 
> > > It is quite possible to do memory management aimed at one container
> > > while that container's memory still participates in the main VM.  
> > > 
> > > There is overhead here, as the LRU scanning mechanisms get less
> > > efficient, but I'd rather pay a penalty at LRU scanning time than divide
> > > up the VM, or coarsely start failing allocations.
> > 
> > This could of course be solved with one LRU per container, which is how
> > the CKRM memory controller implemented things about a year ago.
> 
> Effectively Andrew's idea of faking up nodes is also giving per
> container LRUs.

Yes, but the NUMA emulation approach is using fixed size containers
where the size is selectable at the kernel command line, while the CKRM
(and pzone) approach provides a more dynamic (and complex) solution.

/ magnus

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