linux-kernel - Re: [PATCH v3 5/9] perf, x86: large PEBS interrupt threshold

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Message-ID: <20140722161617.GQ18735@two.firstfloor.org>
Date:	Tue, 22 Jul 2014 18:16:18 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	mingo@...nel.org, acme@...radead.org, eranian@...gle.com,
	andi@...stfloor.org
Subject: Re: [PATCH v3 5/9] perf, x86: large PEBS interrupt threshold

> +	/*
> +	 * 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 */

Where in the patchkit does it get reenabled?

-Andi

> +	    (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) &&
> +	    !(event->attr.sample_type & ~PEBS_FREERUNNING_FLAGS)) {
> +		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;
> +	}
> +	if (first_pebs || ds->pebs_interrupt_threshold > threshold)
> +		ds->pebs_interrupt_threshold = threshold;
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