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

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Message-ID: <20100121173259.GC16707@redhat.com>
Date:	Thu, 21 Jan 2010 19:32:59 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>, mtosatti@...hat.com,
	kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove

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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