linux-kernel - Re: [PATCH v3] fpga: dfl: fme: Fix cpu hotplug issue in performance reporting

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Date:   Mon, 2 Aug 2021 17:16:42 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     will@...nel.org, hao.wu@...el.com, mark.rutland@....com,
        trix@...hat.com, yilun.xu@...el.com, linux-fpga@...r.kernel.org,
        maddy@...ux.ibm.com, atrajeev@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        rnsastry@...ux.ibm.com, linux-perf-users@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v3] fpga: dfl: fme: Fix cpu hotplug issue in performance
 reporting



On 8/2/21 2:28 PM, Moritz Fischer wrote:
> On Mon, Aug 02, 2021 at 01:15:00PM +0530, kajoljain wrote:
>>
>>
>> On 7/13/21 1:12 PM, Kajol Jain wrote:
>>> The performance reporting driver added cpu hotplug
>>> feature but it didn't add pmu migration call in cpu
>>> offline function.
>>> This can create an issue incase the current designated
>>> cpu being used to collect fme pmu data got offline,
>>> as based on current code we are not migrating fme pmu to
>>> new target cpu. Because of that perf will still try to
>>> fetch data from that offline cpu and hence we will not
>>> get counter data.
>>>
>>> Patch fixed this issue by adding pmu_migrate_context call
>>> in fme_perf_offline_cpu function.
>>>
>>> Fixes: 724142f8c42a ("fpga: dfl: fme: add performance reporting support")
>>> Tested-by: Xu Yilun <yilun.xu@...el.com>
>>> Acked-by: Wu Hao <hao.wu@...el.com>
>>> Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
>>> Cc: stable@...r.kernel.org
>>> ---
>>
>> Any update on this patch? Please let me know if any changes required.
>>
>> Thanks,
>> Kajol Jain
> 
> It's in my 'fixes' branch.

Thanks Moritz for informing me.

Thanks,
Kajol Jain

> 
> - Moritz
>