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Message-Id: <20071101.153824.91808126.davem@davemloft.net>
Date: Thu, 01 Nov 2007 15:38:24 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: clameter@....com
Cc: akpm@...ux-foundation.org, linux-arch@...r.kernel.org,
linux-kernel@...r.kernel.org, mathieu.desnoyers@...ymtl.ca,
penberg@...helsinki.fi
Subject: Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu
access overhead
From: Christoph Lameter <clameter@....com>
Date: Thu, 1 Nov 2007 15:15:39 -0700 (PDT)
> After boot is complete we allow the reduction of the size of the per cpu
> areas . Lets say we only need 128k per cpu. Then the remaining pages will
> be returned to the page allocator.
You don't know how much you will need. I exhausted the limit on
sparc64 very late in the boot process when the last few userland
services were starting up.
And if I subsequently bring up 100,000 IP tunnels, it will exhaust the
per-cpu allocation area.
You have to make it fully dynamic, there is no way around it.
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