linux-kernel - Re: Too many rescheduling interrupts (still!)

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Message-ID: <20140212181517.GE27965@twins.programming.kicks-ass.net>
Date:	Wed, 12 Feb 2014 19:15:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <bitbucket@...ine.de>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Too many rescheduling interrupts (still!)

On Wed, Feb 12, 2014 at 06:46:39PM +0100, Frederic Weisbecker wrote:
> Ok but if the target is idle, dynticks and not polling, we don't have the choice
> but to send an IPI, right? I'm talking about this kind of case.

Yes; but Andy doesn't seem concerned with such hardware (!x86).

Anything x86 (except ancient stuff) is effectively polling and wakes up
from the TIF_NEED_RESCHED write.

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