linux-kernel - Re: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator driver

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Date:	Mon, 27 Oct 2008 12:36:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, Pavel Machek <pavel@...e.cz>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jack Steiner <steiner@....com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Richard Purdie <rpurdie@...ys.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator
	driver


* Mike Travis <travis@....com> wrote:

> > The idle thread always has pid 0. So if the timer sees 
> > current->pid == 0 it interrupted idle.

that's still hacky as it hardcodes the idle == pid-0 assumption. 
Please use the idle_cpu() function of the scheduler instead.

	Ingo
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