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List: linux-kernel
Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and improve
From: "H. Peter Anvin" <hpa () zytor ! com>
Date: 2009-06-30 23:34:05
Message-ID: 4A4AA0ED.2020304 () zytor ! com
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Ingo Molnar wrote:
> * Tejun Heo <tj@kernel.org> wrote:
>
>> Hello, Christoph.
>>
>> Christoph Lameter wrote:
>
>>> I looked at allocating for online cpus only a couple of years
>>> back but at that per cpu state was kept for offlined cpus in per
>>> cpu areas. There are numerous assumptions in per cpu handling
>>> all over the kernel that a percpu area is always available.
>> The plan is to allocate and keep percpu areas for cpus which have
>> ever been up. There'll be no taking down of percpu areas.
>> Conversion from possible to has_ever_been_up should be much easier
>> than possible -> online. State keeping will work fine too.
>
> That sounds like a very sane plan.
>
> Ingo
Yes, percpu area dynamic *de*-allocation would almost certainly be a
nightmare.
-hpa
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