linux-kernel - Re: [PATCH] hrtimers: Special-case zero length sleeps

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Message-ID: <20120216143132.293c8f50@pyramind.ukuu.org.uk>
Date:	Thu, 16 Feb 2012 14:31:32 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] hrtimers: Special-case zero length sleeps

> Userspace clearly has an expectation that sleep(0) is magic in some 
> ill-defined way. We'd be well within our rights to break that 
> expectation, but I think it's common enough to warrant special casing.

In historical Unix sleep(0) ends up the nearest equivalent it had to
triggering a reschedule and giving up the rest of the timeslice.

I suspect special casing it as yield() isn't far from the right result ?

Alan
 
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