linux-kernel - Re: [PATCH V9 00/10] arm64/perf: Enable branch stack sampling

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Date:   Mon, 15 May 2023 11:54:07 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, mark.rutland@....com,
        Mark Brown <broonie@...nel.org>,
        James Clark <james.clark@....com>,
        Rob Herring <robh@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Suzuki Poulose <suzuki.poulose@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH V9 00/10] arm64/perf: Enable branch stack sampling



On 4/11/23 18:33, Will Deacon wrote:
> Hi Anshuman
> 
> On Wed, Mar 15, 2023 at 10:44:34AM +0530, Anshuman Khandual wrote:
>> This series enables perf branch stack sampling support on arm64 platform
>> via a new arch feature called Branch Record Buffer Extension (BRBE). All
>> relevant register definitions could be accessed here.
>>
>> https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers
>>
>> This series applies on 6.3-rc1 after applying the following patch from Mark
>> which allows enums in SysregFields blocks in sysreg tools.
>>
>> https://lore.kernel.org/all/20230306114836.2575432-1-mark.rutland@arm.com/
> 
> As mentioned by Mark at:
> 
> https://lore.kernel.org/r/ZB2sGrsbr58ttoWI@FVFF77S0Q05N
> 
> this conflicts with supporting PMUv3 on AArch32. Please can you rebase onto
> for-next/perf, which will mean moving this driver back into drivers/perf/
> now?

Hi Will,

I am back from a long vacation, will go through the earlier discussions
on this and rework the series as required.

- Anshuman