linux-kernel - Re: [patch 02/14] x86/apic: Implement single target IPI function for x2apic

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Message-ID: <alpine.DEB.2.11.1511050903340.4032@nanos>
Date:	Thu, 5 Nov 2015 09:04:14 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Peter Anvin <hpa@...or.com>,
	Borislav Petkov <borislav.petkov@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Travis <travis@....com>,
	Daniel J Blueman <daniel@...ascale.com>
Subject: Re: [patch 02/14] x86/apic: Implement single target IPI function
 for x2apic_cluster

On Wed, 4 Nov 2015, Linus Torvalds wrote:

> On Wed, Nov 4, 2015 at 10:38 PM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > but in the above sequence I think we can do even better: we don't need the
> > local_irq_save()/restore() I think.
> 
> Right. Thomas added that one to my patch.
> 
> I don't think he realized just *how* trivial sending a single IPI is
> with the x2apic, and just how horribly nasty the mask case is in
> comparison (and how nasty it is that we historically turn a the single
> ipi into a mask).

Yeah, I was too tired to look at the details. Will fix that up for the
other trivial cases as well.

Thanks,

	tglx
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