linux-kernel - Re: [patch 0/5] Nano/Microsecond resolution for select() and poll()

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Message-ID: <alpine.LFD.2.00.0808291515130.3298@particle.ddns.nominum.com>
Date:	Fri, 29 Aug 2008 15:15:34 -0700 (PDT)
From:	Brian Wellington <bwelling@...ll.org>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...x.de,
	torvalds@...ux-foundation.org
Subject: Re: [patch 0/5] Nano/Microsecond resolution for select() and
 poll()

On Fri, 29 Aug 2008, Arjan van de Ven wrote:

> Today in Linux, select() and poll() operate in jiffies resolution
> (granularity), meaning an effective resolution of 1 millisecond (HZ=1000) to
> 10 milliseconds (HZ=100). Delays shorter than this are not possible, and all
> delays are in multiples of this granularity.

Would a similar change also be useful for epoll_wait()?  It's unfortunate
that there's no way to use epoll with more than millisecond granularity,
but it seems like the same arguments could be made as with poll().

Brian
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