linux-kernel - Re: [PATCH V6 3/6] perf, x86: large PEBS interrupt threshold

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Message-ID: <20150416184544.GB23123@twins.programming.kicks-ass.net>
Date:	Thu, 16 Apr 2015 20:45:44 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kan Liang <kan.liang@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, acme@...radead.org,
	eranian@...gle.com, andi@...stfloor.org
Subject: Re: [PATCH V6 3/6] perf, x86: large PEBS interrupt threshold

On Thu, Apr 09, 2015 at 12:37:43PM -0400, Kan Liang wrote:
> +	/*
> +	 * When the event is constrained enough we can use a larger
> +	 * threshold and run the event with less frequent PMI.
> +	 */
> +	if (0 && /* disable this temporarily */

This is a good hint your patches are ordered wrong.

> +	    (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD)) {
> +		threshold = ds->pebs_absolute_maximum -
> +			x86_pmu.max_pebs_events * x86_pmu.pebs_record_size;
> +	} else {
> +		threshold = ds->pebs_buffer_base + x86_pmu.pebs_record_size;
> +	}
> +
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