linux-kernel - Re: Large Pages - Linux Foundation HPC

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Message-ID: <alpine.DEB.1.10.0904271010300.1474@qirst.com>
Date:	Mon, 27 Apr 2009 10:12:26 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Badari Pulavarty <pbadari@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Vivek Kashyap <vivk@...ibm.com>,
	Mel Gorman <mel@...ux.vnet.ibm.com>,
	Robert MacFarlan <Robert_MacFarlan@...ibm.com>,
	"Fu, Michael" <michael.fu@...el.com>
Subject: Re: Large Pages - Linux Foundation HPC

On Sat, 25 Apr 2009, Dave Hansen wrote:

> On Sat, 2009-04-25 at 16:48 +0800, Wu Fengguang wrote:
> > Based on Dave's descriptions that HPC apps typically
> > - do mlock(), to pre-populate memory and pin them in memory
> > - run at fresh boot, with loads of high order pages available
>
> There are definitely some of them that do this, but it certainly isn't
> all.  It may not even be the norm.

Some of the machine have so much memory available that 2M allocations are
likely to succeed. If a machine has a couple of terabytes of memory
available then its highly unlikely that a 2M allocation will not succeed.

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