linux-kernel - Re: [PATCH v3 0/9] perf/mem: AMD IBS and generic tools improvements

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Date:   Tue, 16 May 2023 08:15:05 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     peterz@...radead.org
Cc:     mingo@...nel.org, eranian@...gle.com, kan.liang@...ux.intel.com,
        jolsa@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
        leo.yan@...aro.org, kjain@...ux.ibm.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        sandipan.das@....com, ananth.narayan@....com,
        santosh.shukla@....com, Namhyung Kim <namhyung@...nel.org>,
        acme@...nel.org, Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH v3 0/9] perf/mem: AMD IBS and generic tools improvements

On 10-Apr-23 7:53 AM, Ravi Bangoria wrote:
> On 08-Apr-23 3:14 AM, Namhyung Kim wrote:
>> Hi Ravi,
>>
>> On Fri, Apr 7, 2023 at 4:25 AM Ravi Bangoria <ravi.bangoria@....com> wrote:
>>>
>>> Kernel IBS driver wasn't using new PERF_MEM_* APIs due to some of its
>>> limitations. Mainly:
>>>
>>> 1. mem_lvl_num doesn't allow setting multiple sources whereas old API
>>>    allows it. Setting multiple data sources is useful because IBS on
>>>    pre-zen4 uarch doesn't provide fine granular DataSrc details (there
>>>    is only one such DataSrc(2h) though).
>>> 2. perf mem sorting logic (sort__lvl_cmp()) ignores mem_lvl_num. perf
>>>    c2c (c2c_decode_stats()) does not use mem_lvl_num at all. perf mem
>>>    prints mem_lvl and mem_lvl_num both if both are set, which is ugly.
>>>
>>> Set mem_lvl_num, mem_remote and mem_hops for data_src via IBS. Handle
>>> first issue using mem_lvl_num = ANY_CACHE | HOPS_0. In addition to
>>> setting new API fields, convert all individual field assignments to
>>> compile time wrapper macros built using PERF_MEM_S(). Also convert
>>> DataSrc conditional code to array lookups.
>>>
>>> Interpretation of perf_mem_data_src by perf_mem__lvl_scnprintf() was
>>> non-intuitive. Make it sane.
>>
>> Looks good, but I think you need to split kernel and user patches.
> 
> Patch #1 to #3 are kernel changes. Patch #4 to #9 are userspace changes.
> Arnaldo, Peter, please let me know if you wants to split the series and
> resend.

Hi Peter, tools/ patches are already upstream. Can you please pick up
kernel changes.

Thanks,
Ravi