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

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Date:	Sat, 21 Apr 2007 12:49:52 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Kyle Moffett" <mrmacman_g4@....com>
Cc:	"William Lee Irwin III" <wli@...omorphy.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);

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.
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