RE: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2
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- To: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
- Subject: RE: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2
- From: "Luck, Tony" <tony.luck@xxxxxxxxx>
- Date: Wed, 30 Sep 2009 15:05:43 -0700
- Accept-language: en-US
- Acceptlanguage: en-US
- Cc: Tejun Heo <teheo@xxxxxxx>, Nick Piggin <npiggin@xxxxxxx>, "Yu, Fenghua" <fenghua.yu@xxxxxxxxx>, linux-ia64 <linux-ia64@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
- In-reply-to: <alpine.DEB.1.10.0909301644460.9271@xxxxxxxxxx>
- List-id: <linux-ia64.vger.kernel.org>
- References: <1253682382-24740-1-git-send-email-tj@xxxxxxxxxx> <4AC153EA.2050007@xxxxxxx> <57C9024A16AD2D4C97DC78E552063EA3E2F03E58@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <alpine.DEB.1.10.0909301644460.9271@xxxxxxxxxx>
- Thread-index: AcpCD+et5X0AeNm2RLa4hdwXyo2iqwACTD8w
- Thread-topic: [PATCHSET percpu#for-next] percpu: convert ia64 to dynamic percpu and drop the old one, take#2
> Tony: Could we use a global register for the per cpu address? That would
> make IA64 work similar to sparc.
Would that be a useful trade of resources for convenience? We've already
hard-wired r13 for "current". Grabbing another one would require fixing
(since user code will have clobbered it). Possibly re-working any existing
code that already uses whatever register you choose.
How would that compare with using [r13]?
We might have a krN free ... but kregs are a lot slower than real registers.
-Tony
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