linux-kernel - Re: [PATCH v2 -tip] perf: x86, add SandyBridge support

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Date:	Mon, 28 Feb 2011 10:15:59 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 -tip] perf: x86, add SandyBridge support

On Mon, 2011-02-28 at 15:22 +0800, Lin Ming wrote:
> This patch adds basic SandyBridge support, including hardware cache
> events and PEBS events support.
> 
> LLC-* hareware cache events don't work for now, it depends on the
> offcore patches.

What's the status of those, Stephane reported some problems last I
remember?


>  #define INTEL_EVENT_CONSTRAINT(c, n)	\
>  	EVENT_CONSTRAINT(c, n, ARCH_PERFMON_EVENTSEL_EVENT)
> +#define INTEL_EVENT_CONSTRAINT2(c, n)	\
> +	EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVENT_MASK)

That's a particularly bad name, how about something like

INTEL_UEVENT_CONSTRAINT or somesuch.

> @@ -702,7 +738,13 @@ static void intel_ds_init(void)
>  			printk(KERN_CONT "PEBS fmt1%c, ", pebs_type);
>  			x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm);
>  			x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm;
> -			x86_pmu.pebs_constraints = intel_nehalem_pebs_events;
> +			switch (boot_cpu_data.x86_model) {
> +			case 42: /* SandyBridge */
> +				x86_pmu.pebs_constraints = intel_snb_pebs_events;
> +				break;
> +			default:
> +				x86_pmu.pebs_constraints = intel_nehalem_pebs_events;
> +			}
>  			break;
>  
>  		default:

We already have this massive model switch right after this function,
might as well move the pebs constraint assignment there.
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