linux-kernel - Re: x86: Is there still value in having a special tlb flush IPI vector?

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Message-Id: <1217327023.7563.8.camel@twins>
Date:	Tue, 29 Jul 2008 12:23:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Ingo Molnar <mingo@...e.hu>, Jeremy Fitzhardinge <jeremy@...p.org>,
	Jens Axboe <jens.axboe@...cle.com>, Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: x86: Is there still value in having a special tlb flush IPI
	vector?

On Tue, 2008-07-29 at 20:17 +1000, Nick Piggin wrote:
> On Tuesday 29 July 2008 20:04, Peter Zijlstra wrote:
> > On Tue, 2008-07-29 at 20:00 +1000, Nick Piggin wrote:
> > > On Tuesday 29 July 2008 19:54, Peter Zijlstra wrote:
> > > > On Tue, 2008-07-29 at 14:30 +1000, Nick Piggin wrote:
> > > > > Not to mention the minor problem that it still deadlocks when called
> > > > > with interrupts disabled ;)
> > > >
> > > > __smp_call_function_single has potential though..
> > >
> > > For reschedule interrupt? I don't really agree.
> >
> > Not specifically, for not deadlocking from irq-off, more so.
> 
> Oh, well yes it already does work from irq-off, so it has already
> realised its potential :)
> 
> Not sure exactly what kinds of users it is going to attract, but
> it should be interesting to see!

grep __smp_call_function_single kernel/sched.c


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