linux-kernel - Re: [PATCH] hrtimer: make epoll_wait() use the hrtimer range feature

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Message-ID: <alpine.DEB.2.00.1008261543470.25446@makko.or.mcafeemobile.com>
Date:	Thu, 26 Aug 2010 15:45:33 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Shawn Bohrer <shawn.bohrer@...il.com>
cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hrtimer: make epoll_wait() use the hrtimer range
 feature

On Sun, 8 Aug 2010, Shawn Bohrer wrote:

> This make epoll use hrtimers for the timeout value which prevents
> epoll_wait() from timing out up to a millisecond early.
> 
> This mirrors the behavior of select() and poll().

I saw this now, since I got notifications from Andrew's patch machine.
Is this really needed?
Is that really worth the extra code in the fast path?
Aren't we breaking existing behavior?
I have some doubts.


- Davide


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