linux-kernel - Re: [ckrm-tech] RFC: Memory Controller

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Date:	Wed, 01 Nov 2006 10:57:11 +0300
From:	Pavel Emelianov <xemul@...nvz.org>
To:	Dave Hansen <haveblue@...ibm.com>
CC:	Pavel Emelianov <xemul@...nvz.org>, balbir@...ibm.com,
	vatsa@...ibm.com, dev@...nvz.org, sekharan@...ibm.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	pj@....com, matthltc@...ibm.com, dipankar@...ibm.com,
	rohitseth@...gle.com, menage@...gle.com
Subject: Re: [ckrm-tech] RFC: Memory Controller

Dave Hansen wrote:
> On Tue, 2006-10-31 at 11:48 +0300, Pavel Emelianov wrote:
>> If memory is considered to be unreclaimable then actions should be
>> taken at mmap() time, not later! Rejecting mmap() is the only way to
>> limit user in unreclaimable memory consumption.
> 
> I don't think this is necessarily true.  Today, if a kernel exceeds its
> allocation limits (runs out of memory) it gets killed.  Doing the
> limiting at mmap() time instead of fault time will keep a sparse memory
> applications from even being able to run.

If limiting _every_ mapping it will, but when limiting only
"private" mappings - no problems at all. BC code lives for
more than 3 years already and no claims from users on this
question yet.

> Now, failing an mmap() is a wee bit more graceful than a SIGBUS, but it
> certainly introduces its own set of problems.
> 
> -- Dave
> 
> 

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