linux-kernel - Re: [PATCH v5 12/20] x86: perf: intel

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Message-ID: <20141022142003.GQ12706@worktop.programming.kicks-ass.net>
Date:	Wed, 22 Oct 2014 16:20:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Robert Richter <rric@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>, kan.liang@...el.com,
	adrian.hunter@...el.com, acme@...radead.org
Subject: Re: [PATCH v5 12/20] x86: perf: intel_pt: Intel PT PMU driver

On Mon, Oct 13, 2014 at 04:45:40PM +0300, Alexander Shishkin wrote:
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -1528,6 +1528,14 @@ again:
>  	}
>  
>  	/*
> +	 * Intel PT
> +	 */
> +	if (__test_and_clear_bit(55, (unsigned long *)&status)) {
> +		handled++;
> +		intel_pt_interrupt();
> +	}
> +

How does the PT interrupt interact with the regular PMI? In particular
does it respect stuff like FREEZE_ON_PMI etc?
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