linux-kernel - Re: [PATCH v5 2/5] perf: Add SNOOP_PEER flag to perf mem data struct

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Message-ID: <20220422184934.29270-1-alisaidi@amazon.com>
Date:   Fri, 22 Apr 2022 18:49:34 +0000
From:   Ali Saidi <alisaidi@...zon.com>
To:     <kan.liang@...ux.intel.com>
CC:     <Nick.Forrington@....com>, <acme@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <alisaidi@...zon.com>,
        <andrew.kilroy@....com>, <benh@...nel.crashing.org>,
        <german.gomez@....com>, <james.clark@....com>,
        <john.garry@...wei.com>, <jolsa@...nel.org>, <kjain@...ux.ibm.com>,
        <leo.yan@...aro.org>, <lihuafei1@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
        <mark.rutland@....com>, <mathieu.poirier@...aro.org>,
        <mingo@...hat.com>, <namhyung@...nel.org>, <peterz@...radead.org>,
        <will@...nel.org>
Subject: Re: [PATCH v5 2/5] perf: Add SNOOP_PEER flag to perf mem data struct

On Wed, 20 Apr 2022 18:43:28, Kan Liang wrote:
> On 4/8/2022 3:53 PM, 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.
> 
> It sounds similar to the Forward state. Why can't the 
> PERF_MEM_SNOOPX_FWD be reused?

Is there a definition of SNOOPX_FWD i can refer to? Happy to use this instead if
the semantics align between architectures.

Thanks,

Ali