linux-kernel - Re: [PATCH v2 0/4] Add perf interface to expose nvdimm

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Message-ID: <14a63986-8a99-26dc-d207-7ff902df3afa@linux.ibm.com>
Date:   Thu, 17 Jun 2021 12:02:56 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Nageswara Sastry <rnsastry@...ux.ibm.com>
Cc:     mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        peterz@...radead.org, maddy@...ux.vnet.ibm.com, santosh@...six.org,
        aneesh.kumar@...ux.ibm.com, vaibhav@...ux.ibm.com,
        dan.j.williams@...el.com, ira.weiny@...el.com,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, tglx@...utronix.de
Subject: Re: [PATCH v2 0/4] Add perf interface to expose nvdimm



On 6/16/21 4:25 PM, Nageswara Sastry wrote:
> 
> 
>> On 14-Jun-2021, at 10:53 AM, Kajol Jain <kjain@...ux.ibm.com> wrote:
>>
>> Patchset adds performance stats reporting support for nvdimm.
>> Added interface includes support for pmu register/unregister
>> functions. A structure is added called nvdimm_pmu to be used for
>> adding arch/platform specific data such as supported events, cpumask
>> pmu event functions like event_init/add/read/del.
>> User could use the standard perf tool to access perf
>> events exposed via pmu.
>>
>> Added implementation to expose IBM pseries platform nmem*
>> device performance stats using this interface.
>> ...
>>
>> Patch1:
>>        Introduces the nvdimm_pmu structure
>> Patch2:
>> 	Adds common interface to add arch/platform specific data
>> 	includes supported events, pmu event functions. It also
>> 	adds code for cpu hotplug support.
>> Patch3:
>>        Add code in arch/powerpc/platform/pseries/papr_scm.c to expose
>>        nmem* pmu. It fills in the nvdimm_pmu structure with event attrs
>>        cpumask andevent functions and then registers the pmu by adding
>>        callbacks to register_nvdimm_pmu.
>> Patch4:
>>        Sysfs documentation patch
> 
> Tested with the following scenarios:
> 1. Check dmesg for nmem PMU registered messages.
> 2. Listed nmem events using 'perf list and perf list nmem'
> 3. Ran 'perf stat' with single event, grouping events, events from same pmu,
>    different pmu and invalid events
> 4. Read from sysfs files, Writing in to sysfs files
> 5. While running nmem events with perf stat, offline cpu from the nmem?/cpumask
> 
> While running the above functionality worked as expected, no error messages seen
> in dmesg.
> 
> Tested-by: Nageswara R Sastry <rnsastry@...ux.ibm.com>

Hi Nageswara,
     Thanks for testing the patch-set.
There is a nit change which need to be done in patch 4(Documentation patch).
We need to update nvdimm mailing list from linux-nvdimm@...ts.01.org to
nvdimm@...ts.linux.dev.
I will make this change and send a new patch-set with your tested-by tag.

Thanks,
Kajol Jain

> 
>>
>> Changelog
>> ---
>> PATCH v1 -> PATCH v2
>> - Fix hotplug code by adding pmu migration call
>>  incase current designated cpu got offline. As
>>  pointed by Peter Zijlstra.
>>
>> - Removed the retun -1 part from cpu hotplug offline
>>  function.
>>
>> - Link to the previous patchset : https://lkml.org/lkml/2021/6/8/500
>> ---
>> Kajol Jain (4):
>>  drivers/nvdimm: Add nvdimm pmu structure
>>  drivers/nvdimm: Add perf interface to expose nvdimm performance stats
>>  powerpc/papr_scm: Add perf interface support
>>  powerpc/papr_scm: Document papr_scm sysfs event format entries
>>
>> Documentation/ABI/testing/sysfs-bus-papr-pmem |  31 ++
>> arch/powerpc/include/asm/device.h             |   5 +
>> arch/powerpc/platforms/pseries/papr_scm.c     | 365 ++++++++++++++++++
>> drivers/nvdimm/Makefile                       |   1 +
>> drivers/nvdimm/nd_perf.c                      | 230 +++++++++++
>> include/linux/nd.h                            |  46 +++
>> 6 files changed, 678 insertions(+)
>> create mode 100644 drivers/nvdimm/nd_perf.c
>>
> Thanks and Regards,
> R.Nageswara Sastry
> 
>>
>