On Mon, Dec 03, 2007 at 02:49:12PM +0300, Alexey Kuznetsov wrote:
> On Mon, Dec 03, 2007 at 10:39:35PM +1100, Herbert Xu wrote:
> > So we need to fix this, and whatever the fix is will probably render
> > the BH/USER distinction obsolete.
>
> Hmm, I would think opposite. USER (or generic) is expensive variant,
> BH is lite. No?
Yes that would certainly be the obvious fix. In other words, just use
smp_processor_id instead of the raw version. I suppose the only issue
would be that disabling/enabling preemption isn't exactly cost-free and
we're going to be doing that for every single increment.
Hmm, wasn't someone else talking about a non-atomic version of atomic
ops lately (i.e., atomic with respect to the local CPU only)? Perhaps
this is the killer app for it :)
Thanks,
--
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Email: Herbert Xu ~{PmV>HI~} <[email protected]>
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