linux-kernel - Re: [patch] eventfd - remove fput() call from possible IRQ context (2nd rev)

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Date:	Mon, 16 Mar 2009 11:36:39 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Jamie Lokier <jamie@...reable.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	linux-aio <linux-aio@...ck.org>, zach.brown@...cle.com
Subject: Re: [patch] eventfd - remove fput() call from possible IRQ context
 (2nd rev)

On Mon, 16 Mar 2009, Jamie Lokier wrote:

> Davide Libenzi wrote:
> > +	if (unlikely(req->ki_eventfd != NULL)) {
> 
> Is this really unlikely?  Having an eventfd seems to be the modern,
> cool, recommended way to do AIO.

I don't have statistics at hand, but I guess that nowadays AIO+eventfd is 
still not very popular. It doesn't make much of a difference either ways I 
guess, so we could drop the unlikely().



- Davide


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