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[v5,02/17] perf tools: sync addition of PERF_MEM_SNOOPX_PEER

Message ID 20220604042820.2270916-3-leo.yan@linaro.org (mailing list archive)
State New, archived
Headers show
Series perf c2c: Support data source and display for Arm64 | expand

Commit Message

Leo Yan June 4, 2022, 4:28 a.m. UTC
From: Ali Saidi <alisaidi@amazon.com>

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>
 tools/include/uapi/linux/perf_event.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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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_SNOOPX_FWD	0x01 /* forward */
-/* 1 free */
+#define PERF_MEM_SNOOPX_PEER	0x02 /* xfer from peer */
 /* locked instruction */