linux-kernel - Re: [PATCH] perf/amd/ibs: Make IBS a core pmu

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Message-ID: <d839086b-826d-3642-5be2-a62714457b62@amd.com>
Date:   Wed, 16 Nov 2022 11:15:54 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     peterz@...radead.org, Ian Rogers <irogers@...gle.com>
Cc:     acme@...nel.org, mark.rutland@....com, jolsa@...hat.com,
        namhyung@...nel.org, eranian@...gle.com, kan.liang@...ux.intel.com,
        bp@...en8.de, x86@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, sandipan.das@....com,
        ananth.narayan@....com, santosh.shukla@....com,
        Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH] perf/amd/ibs: Make IBS a core pmu

On 15-Nov-22 10:37 PM, Ian Rogers wrote:
> On Tue, Nov 15, 2022 at 1:39 AM Ravi Bangoria <ravi.bangoria@....com> wrote:
>>
>> So far, only one pmu was allowed to be registered as core pmu and thus
>> IBS pmus were being registered as uncore. However, with the event context
>> rewrite, that limitation no longer exists and thus IBS pmus can also be
>> registered as core pmu. This makes IBS much more usable, for ex, user
>> will be able to do per-process precise monitoring on AMD:
>>
>> Before patch:
>>   $ sudo perf record -e cycles:pp ls
>>   Error:
>>   Invalid event (cycles:pp) in per-thread mode, enable system wide with '-a'
>>
>> After patch:
>>   $ sudo perf record -e cycles:pp ls
>>   [ perf record: Woken up 1 times to write data ]
>>   [ perf record: Captured and wrote 0.017 MB perf.data (33 samples) ]
>>
>> Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
> 
> Acked-by: Ian Rogers <irogers@...gle.com>
> 
> This is awesome!
> Ian

Thanks Ian.

Peter, can we push this along with rewrite patch?

Thanks,
Ravi