linux-kernel - Re: [PATCH 2.6.23-rc6 Resending] NETWORKING : Edge Triggered EPOLLOUT events get missed for TCP sockets

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Date:	Thu, 20 Sep 2007 15:24:53 -0700 (PDT)
From:	Nagendra Tomar <tomer_iisc@...oo.com>
To:	Davide Libenzi <davidel@...ilserver.org>,
	Eric Dumazet <dada1@...mosbay.com>
Cc:	Nagendra Tomar <tomer_iisc@...oo.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2.6.23-rc6 Resending] NETWORKING : Edge Triggered EPOLLOUT events get missed for TCP sockets


--- Davide Libenzi <davidel@...ilserver.org> wrote:

> 
> Unfortunately f_op->poll() does not let the caller to specify the events 
> it's interested in, that would allow to split send/recevie wait queues and 
> better detect read/write cases.
> The detection of a waitqueue_active(->sk_wr_sleep) would work fine in 
> detecting is someone is actually waiting for a write, w/out the false 
> positives triggered by the read-waiters.
> That would be a very sane thing to do, but would require a big&dumb change 
> to all the ->poll around (that could be automated by a script - devices 
> not caring about the events hint can just continue to use the single queue 
> like they currently do), and a more critical and gradual change of all the 
> devices that wants to take advantage of it.
> That way, no more magic bits are needed, and a simple waitqueue_active() 
> would tell you if someone is waiting for write-space events.
> 

I like this.





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