linux-kernel - Re: [PATCH RESEND v6] perf: Add SNOOP

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Message-ID: <YwhXXiuQ2VysVint@leoy-huanghe.lan>
Date:   Fri, 26 Aug 2022 13:17:18 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ali Saidi <alisaidi@...zon.com>, Kajol Jain <kjain@...ux.ibm.com>
Subject: Re: [PATCH RESEND v6] perf: Add SNOOP_PEER flag to perf mem data
 struct

On Fri, Aug 26, 2022 at 01:16:03PM +0800, Leo Yan wrote:
> From: Ali Saidi <alisaidi@...zon.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.
> 
> Update notes:
> 
> This patch is to sync the headers between kernel and user space, commit
> 2e21bcf0514a ("perf tools: Sync addition of PERF_MEM_SNOOPX_PEER") for
> updating kernel header has been merged in the mainline code.

Hi Peter, could you help to merge this patch?  Thanks!

Leo