Subject: Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19
From: Adam Litke <agl@us.ibm.com>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Paul Jackson <pj@sgi.com>, Linus Torvalds <torvalds@osdl.org>,
       andy@thermo.lanl.gov, mbligh@mbligh.org, akpm@osdl.org,
       arjan@infradead.org, arjanv@infradead.org, haveblue@us.ibm.com,
       kravetz@us.ibm.com, lhms-devel@lists.sourceforge.net,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org, mel@csn.ul.ie,
       mingo@elte.hu, nickpiggin@yahoo.com.au
In-Reply-To: <436B1150.2010001@cosmosbay.com>
References: <20051104010021.4180A184531@thermo.lanl.gov>
	 <Pine.LNX.4.64.0511032105110.27915@g5.osdl.org>
	 <20051103221037.33ae0f53.pj@sgi.com>  <436B1150.2010001@cosmosbay.com>
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Organization: IBM
Date: Mon, 07 Nov 2005 10:42:54 -0600
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On Fri, 2005-11-04 at 08:44 +0100, Eric Dumazet wrote:
> Paul Jackson a ?crit :
> > Linus wrote:
> > 
> >>Maybe you'd be willing on compromising by using a few kernel boot-time 
> >>command line options for your not-very-common load.
> > 
> > 
> > If we were only a few options away from running Andy's varying load
> > mix with something close to ideal performance, we'd be in fat city,
> > and Andy would never have been driven to write that rant.
> 
> I found hugetlb support in linux not very practical/usable on NUMA machines, 
> boot-time parameters or /proc/sys/vm/nr_hugepages.
> 
> With this single integer parameter, you cannot allocate 1000 4MB pages on one 
> specific node, letting small pages on another node.
> 
> I'm not an astrophysician, nor a DB admin, I'm only trying to partition a dual 
> node machine between one (numa aware) memory intensive job and all others 
> (system, network, shells).
> At least I can reboot it if needed, but I feel Andy pain.
> 
> There is a /proc/buddyinfo file, maybe we need a /proc/sys/vm/node_hugepages 
> with a list of integers (one per node) ?

Or perhaps /sys/devices/system/node/nodeX/nr_hugepages triggers that
work like the current /proc trigger but on a per node basis?

-- 
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center

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