linux-kernel - Re: [RFC] perf/x86: PMU IRQ handler issues

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Message-ID: <20140528200600.GR29957@tassilo.jf.intel.com>
Date:	Wed, 28 May 2014 13:06:00 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Dave Hansen <dave.hansen@...el.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: Re: [RFC] perf/x86: PMU IRQ handler issues

On Wed, May 28, 2014 at 09:56:35PM +0200, Stephane Eranian wrote:
> On Wed, May 28, 2014 at 9:55 PM, Andi Kleen <ak@...ux.intel.com> wrote:
> >
> >> Another explanation is that because we ACK the NMI early, we leave the
> >> door open to other interrupts, incl. NIC, and we are interrupting the execution
> >
> > PMI executes with interrupts off.
> >
> And that's coming from where?

The interrupt gate.

-Andi

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