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

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Message-Id: <1156271658.6479.89.camel@linuxchandra>
Date:	Tue, 22 Aug 2006 11:34:18 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
To:	Magnus Damm <magnus@...inux.co.jp>
Cc:	rohitseth@...gle.com, Rik van Riel <riel@...hat.com>,
	ckrm-tech@...ts.sourceforge.net, Dave Hansen <haveblue@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, hugh@...itas.com,
	Ingo Molnar <mingo@...e.hu>, Kirill Korotaev <dev@...ru>,
	devel@...nvz.org, Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

On Tue, 2006-08-22 at 12:58 +0900, Magnus Damm wrote:
> 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.

NUMA emulation does not allow guarantee, only limits. It also doesn't
allow over commit (ove commit issue is present in pzone based approach
also).

> 
> / magnus
> 
> 
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-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@...ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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