Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove

From: Michael S. Tsirkin
Date: Thu Jan 21 2010 - 12:36:18 EST

On Thu, Jan 21, 2010 at 07:33:02PM +0200, Avi Kivity wrote:
> On 01/21/2010 07:23 PM, Michael S. Tsirkin wrote:
>>> I agree.
>>> But I think we can solve this in another way in .32: we can clear the
>>> eventfd from irqfd->inject work, which is in process context. The new
>>> stuff is only needed for lockless clearing, no?
>> No, AFAIK there's no way to clear the counter from kernel without
>> this patch.
> Can't you read from the file?

IMO no, the read could block.

> --
> Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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