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SubjectRe: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation and remove stats_lock
On Thu, 23 Feb 2012 15:12:04 -0800
Tejun Heo <> wrote:

> On Thu, Feb 23, 2012 at 03:01:23PM -0800, Tejun Heo wrote:
> > Hmmm... going through the thread again, ah, okay, I forgot about that
> > completely. Yeah, that is an actual problem. Both __GFP_WAIT which
> > isn't GFP_KERNEL and GFP_KERNEL are valid use cases. I guess we'll be
> > building async percpu pool in blkcg then. Great. :(
> Vivek, you win. :) Can you please refresh the async alloc patch on top
> of blkcg-stacking branch? I'll rool that into this series and drop
> the mempool stuff.

I forget how those patches work, but they might be vulnerable to the
same issue. If the block layer can handle the failed allocation
attempt and retry at the next I/O event then I guess that would be
acceptable; we'd lose a bit of statistical info occasionally, but who

But ISTR that we can't handle allocation failures here?

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