linux-kernel - Re: [PATCH 6/8] Add __GFP_OTHER

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Message-ID: <20110307163334.GB13384@alboin.amr.corp.intel.com>
Date:	Mon, 7 Mar 2011 08:33:34 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	aarcange@...hat.com
Subject: Re: [PATCH 6/8] Add __GFP_OTHER_NODE flag

> Yes, less intrusive. But are you using current NUMA stastics on
> practical system?

Yes I do. I know users use it too.

We unfortunately still have enough NUMA locality problems in the kernel
so that overflowing nodes, causing fallbacks for process memory etc. are not uncommon. 
If you get that then numastat is very useful to track down what happens.

In an ideal world with perfect NUMA balancing it wouldn't be needed,
but we're far from that.

Also the numactl test suite depends on them.

-Andi
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