linux-kernel - Re: [PATCH 2/9] x86, perf: Add support for PEBSv3 profiling

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Message-ID: <20150508105958.GD27504@twins.programming.kicks-ass.net>
Date:	Fri, 8 May 2015 12:59:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kan.liang@...el.com, eranian@...gle.com, acme@...radead.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/9] x86, perf: Add support for PEBSv3 profiling

On Thu, May 07, 2015 at 03:56:25PM -0700, Andi Kleen wrote:
> +/* Same as HSW, plus TSC */
> +
> +struct pebs_record_v3 {

This is inconsistently named.

> +	u64 flags, ip;
> +	u64 ax, bx, cx, dx;
> +	u64 si, di, bp, sp;
> +	u64 r8,  r9,  r10, r11;
> +	u64 r12, r13, r14, r15;
> +	u64 status, dla, dse, lat;
> +	u64 real_ip, tsx_tuning;
> +	u64 tsc;
> +};
> @@ -958,6 +971,13 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
>  			data.txn = intel_hsw_transaction(pebs);
>  	}
>  
> +	/*
> +	 * v3 supplies an accurate time stamp, so we use that
> +	 * for the time stamp.
> +	 */
> +	if (x86_pmu.intel_cap.pebs_format >= 3)
> +		data.time = native_sched_clock_from_tsc(pebs->tsc);

That's wrong. It does not respect perf_event_attr::clock_id.


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