From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ali Saidi <alisaidi@amazon.com>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, german.gomez@arm.com,
leo.yan@linaro.org, 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
Subject: Re: [PATCH v8 2/5] perf tools: sync addition of PERF_MEM_SNOOPX_PEER
Date: Tue, 10 May 2022 13:28:38 -0300 [thread overview]
Message-ID: <YnqStjaWInPqLnsX@kernel.org> (raw)
In-Reply-To: <20220504184850.24986-3-alisaidi@amazon.com>
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@amazon.com>
> Reviewed-by: Leo Yan <leo.yan@linaro.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
next prev parent reply other threads:[~2022-05-10 16:29 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-04 18:48 [PATCH v8 0/4] perf: arm-spe: Decode SPE source and use for perf c2c Ali Saidi
2022-05-04 18:48 ` [PATCH v8 1/5] perf: Add SNOOP_PEER flag to perf mem data struct Ali Saidi
2022-05-11 5:41 ` kajoljain
2022-05-04 18:48 ` [PATCH v8 2/5] perf tools: sync addition of PERF_MEM_SNOOPX_PEER Ali Saidi
2022-05-10 16:28 ` Arnaldo Carvalho de Melo [this message]
2022-05-11 2:20 ` Leo Yan
2022-05-11 18:28 ` Arnaldo Carvalho de Melo
2022-05-11 18:29 ` Arnaldo Carvalho de Melo
2022-05-11 5:42 ` kajoljain
2022-05-04 18:48 ` [PATCH v8 3/5] perf mem: Print snoop peer flag Ali Saidi
2022-05-11 5:45 ` kajoljain
2022-05-04 18:48 ` [PATCH v8 4/5] perf arm-spe: Don't set data source if it's not a memory operation Ali Saidi
2022-05-04 18:48 ` [PATCH v8 5/5] perf arm-spe: Use SPE data source for neoverse cores Ali Saidi
2022-05-05 15:03 ` Leo Yan
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