Re: [PATCHSET] block, mempool, percpu: implement percpu mempooland fix blkcg percpu alloc deadlock

[Tejun Heo]

Hello,

On Thu, Dec 22, 2011 at 01:59:25PM -0800, Andrew Morton wrote:
> How about we just delete those statistics and then this patchset?
> 
> Or how about we change those statistics to not do percpu allocations,
> then delete this patchset?

I'm not against above both but apparently those percpu stats reduced
CPU overhead significantly.

> Or how about we fix the percpu memory allocation code so that it
> propagates the gfp flags, then delete this patchset?

Oh, no, this is gonna make things *way* more complex.  I tried.  If
we're gonna have many more NOIO percpu users, which I don't think we
would or should, that might make sense but, for fringe cases,
extending mempool to cover percpu is a much better sized solution.

Thanks.

-- 
tejun
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