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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-rt-users <linux-rt-users@vger.kernel.org>,
	akpm@osdl.org, Ingo Molnar <mingo@elte.hu>,
	Clark Williams <clark.williams@gmail.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"Luis Claudio R. Goncalves" <lclaudio@uudg.org>,
	Gregory Haskins <ghaskins@novell.com>, Andi Kleen <ak@suse.de>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH] x86: enable preemption in delay
Date: Sun, 25 May 2008 14:19:21 +0100	[thread overview]
Message-ID: <20080525141921.79c1bdc2@core> (raw)
In-Reply-To: <Pine.LNX.4.58.0805250915410.20625@gandalf.stny.rr.com>

> And what happens when we have 10GHz boxes that can do migration in 1us,
> and the delay that is asked for is 2us. We can return early.  I don't like
> to place assumptions of this kind that can hurt with future hardware
> enhancements.

Then in the hypothetical future you fix it, and for now its clearly
documented. Th preempt botch in the current tree breaks all sorts of
existing real world setups so needs to go. (and we have people who do
stuff like mdelay(150);

Alan

  reply	other threads:[~2008-05-25 13:33 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-25  3:11 Steven Rostedt
2008-05-25 12:44 ` Thomas Gleixner
2008-05-25 13:07   ` Steven Rostedt
2008-05-25 13:17   ` Steven Rostedt
2008-05-25 13:19     ` Alan Cox [this message]
2008-05-25 13:40       ` Steven Rostedt
2008-05-25 20:21     ` Thomas Gleixner
2008-05-25 13:35   ` [PATCH -v2] " Steven Rostedt
2008-05-25 13:44     ` Steven Rostedt
2008-05-25 13:51       ` [PATCH -v3] " Steven Rostedt
2008-05-25 15:04         ` Steven Rostedt
2008-05-25 15:13         ` [PATCH -v4] " Steven Rostedt
2008-05-25 18:01   ` [PATCH] " Pavel Machek
2008-05-28 13:01     ` Steven Rostedt
2008-05-31  7:18       ` Pavel Machek
2008-05-25 18:53 ` Arjan van de Ven
2008-05-25 19:01   ` Thomas Gleixner
2008-05-25 19:28     ` Arjan van de Ven
2008-05-25 19:32   ` Steven Rostedt

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