linux-kernel - Re: [PATCH v5 10/14] perf: cs-etm: Update record event to use new Trace ID protocol

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Message-ID: <10992b96-85b1-bf1f-d7e1-994b00a507eb@arm.com>
Date:   Tue, 8 Nov 2022 23:31:34 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Mike Leach <mike.leach@...aro.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     mathieu.poirier@...aro.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, linux-perf-users@...r.kernel.org,
        leo.yan@...aro.org, quic_jinlmao@...cinc.com
Subject: Re: [PATCH v5 10/14] perf: cs-etm: Update record event to use new
 Trace ID protocol

On 01/11/2022 16:30, Mike Leach wrote:
> Trace IDs are now dynamically allocated.
> 
> Previously used the static association algorithm that is no longer
> used. The 'cpu * 2 + seed' was outdated and broken for systems with high
> core counts (>46). as it did not scale and was broken for larger
> core counts.
> 
> Trace ID will now be sent in PERF_RECORD_AUX_OUTPUT_HW_ID record.
> 
> Legacy ID algorithm renamed and retained for limited backward
> compatibility use.
> 
> Signed-off-by: Mike Leach <mike.leach@...aro.org>
> Reviewed-by: James Clark <james.clark@....com>

Acked-by: Suzuki K Poulose <suzuki.poulose@....com>