linux-kernel - Re: [REGRESSION][BISECT] perf/core: Remove pmu linear searching code

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Date:   Mon, 5 Jun 2023 12:17:09 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Ravi Bangoria <ravi.bangoria@....com>, jolsa@...nel.org,
        irogers@...gle.com, bp@...en8.de, adrian.hunter@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: [REGRESSION][BISECT] perf/core: Remove pmu linear searching code

On 05/06/2023 12:14, Peter Zijlstra wrote:
> On Mon, Jun 05, 2023 at 11:27:31AM +0200, Peter Zijlstra wrote:
> 
>> That said; given that this commit has been tagged twice now, I suppose I
>> should go revert it and we'll try again after a more thorough audit.
> 
> I'll go queue this then...
> 
> ---
> Subject: perf: Re-instate the linear PMU search
> From: Peter Zijlstra <peterz@...radead.org>
> Date: Mon Jun  5 11:42:39 CEST 2023
> 
> Full revert of commit 9551fbb64d09 ("perf/core: Remove pmu linear
> searching code").
> 
> Some architectures (notably arm/arm64) still relied on the linear
> search in order to find the PMU that consumes
> PERF_TYPE_{HARDWARE,HW_CACHE,RAW}.
> 
> This will need a more thorought audit and clean.
> 
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Reported-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Thanks.

Best regards,
Krzysztof