On Thursday 11 April 2013 18:03:09 Ming Lei wrote:
> On Thu, Apr 11, 2013 at 5:53 PM, Oliver Neukum <[email protected]> wrote:
> > On Thursday 11 April 2013 16:09:16 Ming Lei wrote:
> >>
> >> Could you explain why work queue need GFP_NOIO?
> >
> > Your fix for the memory allocation depends on it happening in the same
> > context. If you execute code on a work queue this happens in the context
> > of a kernel thread.
>
> I understand the interface might be called from workqueue, and my question
> is why GFP_NOIO is needed in the work queue context. Generally speaking,
> GFP_KERNEL is enough for work queue context.
>
> As we discussed before, GFP_NOIO is required in runtime resume context
> and reset context, and the two contexts have been addressed automatically.
> So looks you didn't answer my question, :-)
Sorry, I misunderstood.
Task A Task B queue
queue work
request a reset
allocate memory and block
cancel the work
shit happened
Regards
Oliver
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