[PATCH] arc: perf: Enable generic "cache-references" and "cache-misses" events

[Vineet Gupta]

On 08/25/2016 04:49 AM, Alexey Brodkin wrote:
> ...
>  	[PERF_COUNT_ARC_EDTLB] = "edtlb",	/* D-TLB Miss */
>  	[PERF_COUNT_ARC_EITLB] = "eitlb",	/* I-TLB Miss */
> +
> +	[PERF_COUNT_HW_CACHE_REFERENCES] = "imemrdc",	/* Instr: mem read cached */
> +	[PERF_COUNT_HW_CACHE_MISSES] = "dclm",		/* D-cache Load Miss */

I think this is duplicating a mistake we already have. I vaguely remember when
doing some hackbench profiling last year with range based profiling confined to
memset routine and saw that L1-dcache-misses was counting zero. This is because it
only counts LD misses while memset only does ST.

Performance counter stats for '/sbin/hackbench':

     0 L1-dcache-misses
     0 L1-dcache-load-misses
     1846082 L1-dcache-store-misses


@PeterZ do you concur that is wrong and we ought to setup 2 counters to do this
correctly ?

-Vineet