linux-kernel - Re: Very aggressive memory reclaim

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Date:	Mon, 28 Mar 2011 16:58:50 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	John Lepikhin <johnlepikhin@...il.com>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com, linux-mm@...ck.org
Subject: Re: Very aggressive memory reclaim

Dave Chinner <david@...morbit.com> writes:
>
> First it would be useful to determine why the VM is reclaiming so
> much memory. If it is somewhat predictable when the excessive
> reclaim is going to happen, it might be worth capturing an event

Often it's to get pages of a higher order. Just tracing alloc_pages
should tell you that.

There are a few other cases (like memory failure handling), but they're
more obscure.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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