linux-kernel - Re: [REPORT] cfs-v4 vs sd-0.44

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Message-ID: <20070421231743.GG2986@holomorphy.com>
Date:	Sat, 21 Apr 2007 16:17:43 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Willy Tarreau <w@....eu>, Ingo Molnar <mingo@...e.hu>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Gene Heskett <gene.heskett@...il.com>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44

On 4/21/07, Kyle Moffett <mrmacman_g4@....com> wrote:
>> It might be nice if it was possible to actively contribute your CPU
>> time to a child process.  For example:
>> int sched_donate(pid_t pid, struct timeval *time, int percentage);

On Sat, Apr 21, 2007 at 12:49:52PM -0700, Ulrich Drepper wrote:
> If you do this, and it has been requested many a times, then please
> generalize it.  We have the same issue with futexes.  If a FUTEX_WAIT
> call is issues the remaining time in the slot should be given to the
> thread currently owning the futex.  For non-PI futexes this needs an
> extension of the interface but I would be up for that.  It can have
> big benefits on the throughput of an application.

It's encouraging to hear support for a more full-featured API (or, for
that matter, any response at all) on this front.


-- wli
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