linux-kernel - Re: [patch] change futex

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Message-ID: <20070312142216.GA15357@one.firstfloor.org>
Date:	Mon, 12 Mar 2007 15:22:16 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Theodore Tso <tytso@....edu>, Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Roland McGrath <roland@...hat.com>, akpm@...ux-foundation.org,
	mm-commits@...r.kernel.org, npiggin@...e.de, drepper@...hat.com,
	oleg@...sign.ru, sebastien.dugue@...l.net,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] change futex_wait() to hrtimers

> This becomes especially important if we want the tickless code to
> really shine as far as power management is concerned.  Unfortunately,
> the POSIX timer abstraction doesn't give this kind of flexibility
> easily, so it's going to be a while before we see significant
> userspace adoption of such a kernel feature, but I think it's
> something that would be still worthwhile to add.

I suspect it would be overkill to specify that on every sleep operation.
99% of applications won't care and for the 1% leftover a global per 
process setting should be fine.
I think a single prctl() and a global sysctl as default would be enough.

-Andi

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