Messages in this thread | | | Date | Wed, 20 Jul 2022 15:45:51 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v5 01/17] perf: Add SNOOP_PEER flag to perf mem data struct |
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Em Sat, Jun 04, 2022 at 12:28:04PM +0800, Leo Yan escreveu: > 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> > Reviewed-by: Kajol Jain<kjain@linux.ibm.com>
Hey, any knews about this going upstream? PeterZ?
- Arnaldo
> --- > include/uapi/linux/perf_event.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h > index d37629dbad72..7b88bfd097dc 100644 > --- a/include/uapi/linux/perf_event.h > +++ b/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 */ > -- > 2.25.1
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- Arnaldo
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