linux-kernel - Re: [patch v2 0/5] Nano/Microsecond resolution for select() and poll()

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Message-ID: <Pine.LNX.4.64.0808311411450.6096@alien.or.mcafeemobile.com>
Date:	Sun, 31 Aug 2008 14:13:45 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tglx@...x.de, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch v2   0/5] Nano/Microsecond resolution for select() and
 poll()

On Sun, 31 Aug 2008, Arjan van de Ven wrote:

> Note: 
> even though poll() (as opposed to ppoll()) only accepts milliseconds
> as userspace interface, the behavior will still improve because the current
> time no longer needs to be rounded up to the next jiffie, so on average
> a 500 microseconds behavior improvement.

Another way to get down in the timeout resolution for newer kernels, and 
still supporting the syscalls with millisec timeouts, is to use timerfds.


- Davide


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