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Subject: Re: [PATCH v5 3/5] perf tools: sync addition of PERF_MEM_SNOOPX_PEER
To:     Ali Saidi <alisaidi@amazon.com>, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, leo.yan@linaro.org,
        acme@kernel.org
Cc:     benh@kernel.crashing.org, Nick.Forrington@arm.com,
        alexander.shishkin@linux.intel.com, andrew.kilroy@arm.com,
        james.clark@arm.com, john.garry@huawei.com, jolsa@kernel.org,
        kjain@linux.ibm.com, lihuafei1@huawei.com, mark.rutland@arm.com,
        mathieu.poirier@linaro.org, mingo@redhat.com, namhyung@kernel.org,
        peterz@infradead.org, will@kernel.org
References: <20220408195344.32764-1-alisaidi@amazon.com>
 <20220408195344.32764-4-alisaidi@amazon.com>
From:   German Gomez <german.gomez@arm.com>
Message-ID: <39448754-adf5-f1ba-25e7-8ee3d76f0159@arm.com>
Date:   Mon, 11 Apr 2022 11:26:34 +0100
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On 08/04/2022 20:53, Ali Saidi wrote:
> 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.

I think it's fine to merge this and the previous commit rather than have
two commits with the same msg.

>
> Signed-off-by: Ali Saidi <alisaidi@amazon.com>
> ---
>  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 82858b697c05..c9e58c79f3e5 100644
> --- a/tools/include/uapi/linux/perf_event.h
> +++ b/tools/include/uapi/linux/perf_event.h
> @@ -1308,7 +1308,7 @@ 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 */