linux-kernel - Re: [PATCH V3 2/6] perf/x86/intel/uncore: Add alias PMU name

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Message-ID: <bc46391e-5029-56a5-5a8a-51e16a62dab7@linux.intel.com>
Date:   Wed, 30 Jun 2021 09:06:29 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org, eranian@...gle.com,
        namhyung@...nel.org, jolsa@...hat.com, ak@...ux.intel.com,
        yao.jin@...ux.intel.com
Subject: Re: [PATCH V3 2/6] perf/x86/intel/uncore: Add alias PMU name



On 6/30/2021 5:39 AM, Greg KH wrote:
> On Tue, Jun 29, 2021 at 11:13:59AM -0700, kan.liang@...ux.intel.com wrote:
>> From: Kan Liang <kan.liang@...ux.intel.com>
>>
>> A perf PMU may have two PMU names. For example, Intel Sapphire Rapids
>> server supports the discovery mechanism. Without the platform-specific
>> support, an uncore PMU is named by a type ID plus a box ID, e.g.,
>> uncore_type_0_0, because the real name of the uncore PMU cannot be
>> retrieved from the discovery table. With the platform-specific support
>> later, perf has the mapping information from a type ID to a specific
>> uncore unit. Just like the previous platforms, the uncore PMU is named
>> by the real PMU name, e.g., uncore_cha_0. The user scripts which work
>> well with the old numeric name may not work anymore.
>>
>> Add a new attribute "alias" to indicate the old numeric name. The
>> following userspace perf tool patch will handle both names. The user
>> scripts should work properly with the updated perf tool.
>>
>> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
>> Cc: gregkh@...uxfoundation.org
>> ---
>>   arch/x86/events/intel/uncore.c       | 19 +++++++++++++------
>>   arch/x86/events/intel/uncore.h       |  1 +
>>   arch/x86/events/intel/uncore_snbep.c | 28 +++++++++++++++++++++++++++-
>>   3 files changed, 41 insertions(+), 7 deletions(-)
> 
> No Documentation/ABI/ update for your new sysfs file?
> 
> :(
> 

Ah, I forgot to git add the new file. Sorry for it.
I will resend the V4.

Thanks,
Kan