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Date: Wed, 19 Dec 2001 23:16:19 +0100
From: Pavel Machek <pavel@suse.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Davide Libenzi <davidel@xmailserver.org>,
        Rusty Russell <rusty@rustcorp.com.au>, anton@samba.org, davej@suse.de,
        marcelo@conectiva.com.br, lkml <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@transmeta.com>
Subject: Re: Linux 2.4.17-pre5
Message-ID: <20011219231619.A120@elf.ucw.cz>
In-Reply-To: <Pine.LNX.4.40.0112081824210.1019-100000@blue1.dev.mcafeelabs.com> <E16D6l9-00073R-00@the-village.bc.nu>
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Hi!

> > Using the scheduler i'm working on and setting a trigger load level of 2,
> > as soon as the idle is scheduled it'll go to grab the task waiting on the
> > other cpu and it'll make it running.
> 
> That rapidly gets you thrashing around as I suspect you've found.
> 
> I'm currently using the following rule in wake up
> 
> 	if(current->mm->runnable > 0)	/* One already running ? */
> 		cpu = current->mm->last_cpu;

Is this really a win?

I mean, if I have two tasks that can run from L2 cache, I want them on
different physical CPUs even if they share current->mm, no?
								Pavel

-- 
"I do not steal MS software. It is not worth it."
                                -- Pavel Kankovsky
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