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

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Message-ID: <a36005b50704220017y664eef89u5f78f1e089c5014@mail.gmail.com>
Date:	Sun, 22 Apr 2007 00:17:31 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"William Lee Irwin III" <wli@...omorphy.com>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Kyle Moffett" <mrmacman_g4@....com>, "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 4/22/07, William Lee Irwin III <wli@...omorphy.com> wrote:
> I'm just looking for what people want the API to be here. With that in
> hand we can just go out and do whatever needs to be done.

I think a sched_yield_to is one interface:

   int sched_yield_to(pid_t);

For futex(), the extension is needed for the FUTEX_WAIT operation.  We
need a new operation FUTEX_WAIT_FOR or so which takes another (the
fourth) parameter which is the PID of the target.

For FUTEX_LOCK_PI we need no extension.  The futex value is the PID of
the current owner.  This is required for the whole interface to work
in the first place.
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