linux-kernel - Re: [PATCH v8 2/5] perf tools: sync addition of PERF_MEM_SNOOPX

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Date:   Tue, 10 May 2022 13:28:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ali Saidi <alisaidi@...zon.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, german.gomez@....com,
        leo.yan@...aro.org, benh@...nel.crashing.org,
        Nick.Forrington@....com, alexander.shishkin@...ux.intel.com,
        andrew.kilroy@....com, james.clark@....com, john.garry@...wei.com,
        jolsa@...nel.org, kjain@...ux.ibm.com, lihuafei1@...wei.com,
        mark.rutland@....com, mathieu.poirier@...aro.org, mingo@...hat.com,
        namhyung@...nel.org, peterz@...radead.org, will@...nel.org
Subject: Re: [PATCH v8 2/5] perf tools: sync addition of PERF_MEM_SNOOPX_PEER

Em Wed, May 04, 2022 at 06:48:47PM +0000, Ali Saidi escreveu:
> Add a flag to the perf mem data struct to signal that a request caused a
> cache-to-cache transfer of a line from a peer of the requestor and
> wasn't sourced from a lower cache level.  The line being moved from one
> peer cache to another has latency and performance implications. On Arm64
> Neoverse systems the data source can indicate a cache-to-cache transfer
> but not if the line is dirty or clean, so instead of overloading HITM
> define a new flag that indicates this type of transfer.
> 
> Signed-off-by: Ali Saidi <alisaidi@...zon.com>
> Reviewed-by: Leo Yan <leo.yan@...aro.org>

Was this already merged on the ARM kernel tree?

- Arnaldo

> ---
>  tools/include/uapi/linux/perf_event.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
> index d37629dbad72..7b88bfd097dc 100644
> --- a/tools/include/uapi/linux/perf_event.h
> +++ b/tools/include/uapi/linux/perf_event.h
> @@ -1310,7 +1310,7 @@ union perf_mem_data_src {
>  #define PERF_MEM_SNOOP_SHIFT	19
>  
>  #define PERF_MEM_SNOOPX_FWD	0x01 /* forward */
> -/* 1 free */
> +#define PERF_MEM_SNOOPX_PEER	0x02 /* xfer from peer */
>  #define PERF_MEM_SNOOPX_SHIFT  38
>  
>  /* locked instruction */
> -- 
> 2.32.0

-- 

- Arnaldo