linux-kernel - Re: [PATCH 5/5] perf, x86: Use Broadwell cache event list for Haswell

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Message-ID: <20140901135231.GO27892@worktop.ger.corp.intel.com>
Date:	Mon, 1 Sep 2014 15:52:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, eranian@...gle.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 5/5] perf, x86: Use Broadwell cache event list for Haswell

On Mon, Aug 25, 2014 at 03:43:31PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Use the newly added Broadwell cache event list for Haswell too.
> They are identical, but Haswell is very different from the Sandy Bridge
> list that was used previously. That fixes a wide range of mis-counting
> cache events.
> 
> The node events are now only for retired memory events.
> 
> The prefetch events are gone now. They way the hardware counts
> them is very misleading (some prefetches included, others not), so
> it seemed best to leave them out.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  arch/x86/kernel/cpu/perf_event_intel.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
> index 53bd98d..190b29e 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -2692,8 +2692,8 @@ __init int intel_pmu_init(void)
>  	case 63: /* 22nm Haswell Server */
>  	case 69: /* 22nm Haswell ULT */
>  		x86_pmu.late_ack = true;
> -		memcpy(hw_cache_event_ids, snb_hw_cache_event_ids, sizeof(hw_cache_event_ids));
> -		memcpy(hw_cache_extra_regs, snb_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
> +		memcpy(hw_cache_event_ids, bdw_hw_cache_event_ids, sizeof(hw_cache_event_ids));
> +		memcpy(hw_cache_extra_regs, bdw_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));

We name things for the earliest chip they're valid for. This means this
is inconsistent and 'wrong'. These tables should be called after haswell
not broadwell.
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