linux-kernel - Re: [PATCH 1/3] perf, x86: Add new cache events table for Haswell

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Date:	Tue, 10 Feb 2015 11:34:55 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, kan.liang@...el.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/3] perf, x86: Add new cache events table for Haswell

On Mon, Feb 09, 2015 at 11:17:44AM -0800, Andi Kleen wrote:
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -415,6 +415,199 @@ static __initconst const u64 snb_hw_cache_event_ids
>  
>  };
>  
> +/*
> + * Notes on the events:
> + * - data reads do not include code reads (comparable to earlier tables)
> + * - data counts include speculative execution (except L1 write, dtlb, bpu)
> + * - remote node access includes both remote memory, remote cache, remote mmio.
> + * - prefetches are not included in the counts.
> + * The events with additional caveats have references to the specification update.
> + */

It would be good to have the prefetch note from the changelog in a
comment here or at the extra_regs table; i.e. prefetches are not
included because they're 'broken'.

> +
> +#define HSW_DEMAND_DATA_RD		BIT(0)
> +#define HSW_DEMAND_RFO			BIT(1)
> +#define HSW_PF_L2_RFO			BIT(5)
> +#define HSW_PF_L3_RFO			BIT(8)
> +#define HSW_ALL_RFO			(HSW_DEMAND_RFO| \
> +					 HSW_PF_L2_RFO|HSW_PF_L3_RFO)
> +#define HSW_ANY_RESPONSE		BIT(16)
> +#define HSW_SUPPLIER_NONE		BIT(17)
> +#define HSW_L3_MISS_LOCAL		BIT(22)
> +#define HSW_L3_MISS_REMOTE_HOP0		BIT(27)
> +#define HSW_L3_MISS_REMOTE_HOP1		BIT(28)
> +#define HSW_L3_MISS_REMOTE_HOP2P	BIT(29)
> +#define HSW_L3_MISS			(HSW_L3_MISS_LOCAL| \
> +					 HSW_L3_MISS_REMOTE_HOP0|HSW_L3_MISS_REMOTE_HOP1| \
> +					 HSW_L3_MISS_REMOTE_HOP2P)
> +#define HSW_SNOOP_NONE			BIT(31)
> +#define HSW_SNOOP_NOT_NEEDED		BIT(32)
> +#define HSW_SNOOP_MISS			BIT(33)
> +#define HSW_SNOOP_HIT_NO_FWD		BIT(34)
> +#define HSW_SNOOP_HIT_WITH_FWD		BIT(35)
> +#define HSW_SNOOP_HITM			BIT(36)
> +#define HSW_SNOOP_NON_DRAM		BIT(37)
> +#define HSW_ANY_SNOOP			(HSW_SNOOP_NONE| \
> +					 HSW_SNOOP_NOT_NEEDED|HSW_SNOOP_MISS| \
> +					 HSW_SNOOP_HIT_NO_FWD|HSW_SNOOP_HIT_WITH_FWD| \
> +					 HSW_SNOOP_HITM|HSW_SNOOP_NON_DRAM)

Just in case someone is crazy enough to run a 32bit kernel on HSW, this
needs to be BIT_ULL() -- also for compile testing, gcc tends to complain
about things like (1UL << 32) for ILP32 targets.

> +static __initconst const u64 hsw_hw_cache_extra_regs
> +				[PERF_COUNT_HW_CACHE_MAX]
> +				[PERF_COUNT_HW_CACHE_OP_MAX]
> +				[PERF_COUNT_HW_CACHE_RESULT_MAX] =
> +{
> + [ C(LL  ) ] = {
> +	[ C(OP_READ) ] = {
> +		[ C(RESULT_ACCESS) ] = HSW_DEMAND_DATA_RD|
> +				       HSW_ANY_RESPONSE|HSW_ANY_SNOOP|
> +				       HSW_SUPPLIER_NONE,
> +		[ C(RESULT_MISS)   ] = HSW_DEMAND_DATA_RD|
> +				       HSW_L3_MISS|HSW_ANY_SNOOP|
> +				       HSW_SUPPLIER_NONE,
> +	},
> +	[ C(OP_WRITE) ] = {
> +		[ C(RESULT_ACCESS) ] = HSW_DEMAND_RFO|
> +				       HSW_ANY_RESPONSE|HSW_ANY_SNOOP|
> +				       HSW_SUPPLIER_NONE,
> +		[ C(RESULT_MISS)   ] = HSW_DEMAND_RFO|HSW_L3_MISS|
> +				       HSW_ANY_SNOOP|HSW_SUPPLIER_NONE,
> +	},
> +	[ C(OP_PREFETCH) ] = {
> +		[ C(RESULT_ACCESS) ] = 0x0,
> +		[ C(RESULT_MISS)   ] = 0x0,
> +	},
> + },
> + [ C(NODE) ] = {
> +	[ C(OP_READ) ] = {
> +		[ C(RESULT_ACCESS) ] = HSW_DEMAND_DATA_RD|
> +				       HSW_L3_MISS_LOCAL|HSW_SUPPLIER_NONE|
> +				       HSW_ANY_SNOOP,
> +		[ C(RESULT_MISS)   ] = HSW_DEMAND_DATA_RD|
> +				       HSW_L3_MISS_REMOTE_HOP0|HSW_L3_MISS_REMOTE_HOP1|
> +				       HSW_L3_MISS_REMOTE_HOP2P|HSW_SUPPLIER_NONE|
> +				       HSW_ANY_SNOOP,
> +	},
> +	[ C(OP_WRITE) ] = {
> +		[ C(RESULT_ACCESS) ] = HSW_DEMAND_RFO|
> +				       HSW_L3_MISS_LOCAL|HSW_SUPPLIER_NONE|
> +				       HSW_ANY_SNOOP,
> +		[ C(RESULT_MISS)   ] = HSW_DEMAND_RFO|
> +				       HSW_L3_MISS_REMOTE_HOP0|HSW_L3_MISS_REMOTE_HOP1|
> +				       HSW_L3_MISS_REMOTE_HOP2P|HSW_SUPPLIER_NONE|
> +				       HSW_ANY_SNOOP,
> +	},
> +	[ C(OP_PREFETCH) ] = {
> +		[ C(RESULT_ACCESS) ] = 0x0,
> +		[ C(RESULT_MISS)   ] = 0x0,
> +	},
> + },
> +};

Now the other tables create little helpers like:

#define HSW_DMND_READ	(HSW_DMND_DATA_RD)
#define HSW_DMND_WRITE	(HSW_DMND_RFO)

#define HSW_L3_ACCESS	(HSW_ANY_RESPONSE)
#define HSW_L3_MISS	(HSW_L3_MISS)

And compose the tables values using those:

	HSW_DMND_READ|HSW_L3_ACCESS

Please do so here too.

Now; when comparing these value to the SNB for example I note that you
include ANY_SNOOP and SUPPLIER_NONE in L3_ACCESS, SNB and other do not,
please explain.


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