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

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Message-Id: <20100826153156.9ca92942.akpm@linux-foundation.org>
Date:	Thu, 26 Aug 2010 15:31:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Shawn Bohrer <shawn.bohrer@...il.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Davide Libenzi <davidel@...ilserver.org>
Subject: Re: [PATCH] hrtimer: make epoll_wait() use the hrtimer range
 feature


I'd say this is an epoll patch, not an hrtimer patch.  So I renamed it
to "epoll: make epoll_wait() use the hrtimer range feature".

Davide looks after epoll, so let's cc him.

On Sun,  8 Aug 2010 17:45:32 -0500
Shawn Bohrer <shawn.bohrer@...il.com> 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().
> 
> ...
>
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c

Davide stuff ;)

> --- a/fs/select.c
> +++ b/fs/select.c
> @@ -67,7 +67,7 @@ static long __estimate_accuracy(struct timespec *tv)
>  	return slack;
>  }
>  
> -static long estimate_accuracy(struct timespec *tv)
> +long estimate_accuracy(struct timespec *tv)

"estimate_accuracy" is a rotten name for a global symbol.  I queued a
preparatory patch which renames this to "select_estimate_accuracy".

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