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Date: Sat, 21 Apr 2007 12:49:52 -0700
From: "Ulrich Drepper" <drepper@gmail.com>
To: "Kyle Moffett" <mrmacman_g4@mac.com>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44
Cc: "William Lee Irwin III" <wli@holomorphy.com>,
       "Linus Torvalds" <torvalds@linux-foundation.org>,
       "Willy Tarreau" <w@1wt.eu>, "Ingo Molnar" <mingo@elte.hu>,
       "Con Kolivas" <kernel@kolivas.org>, linux-kernel@vger.kernel.org,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "Nick Piggin" <npiggin@suse.de>, "Mike Galbraith" <efault@gmx.de>,
       "Arjan van de Ven" <arjan@infradead.org>,
       "Peter Williams" <pwil3058@bigpond.net.au>,
       "Thomas Gleixner" <tglx@linutronix.de>, caglar@pardus.org.tr,
       "Gene Heskett" <gene.heskett@gmail.com>
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On 4/21/07, Kyle Moffett <mrmacman_g4@mac.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.