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

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Message-ID: <YNrLRLyyUeDemxTS@kroah.com>
Date:   Tue, 29 Jun 2021 09:27:00 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     kajoljain <kjain@...ux.ibm.com>
Cc:     will@...nel.org, hao.wu@...el.com, mark.rutland@....com,
        trix@...hat.com, yilun.xu@...el.com, mdf@...nel.org,
        linux-fpga@...r.kernel.org, maddy@...ux.vnet.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] fpga: dfl: fme: Fix cpu hotplug issue in performance
 reporting

On Tue, Jun 29, 2021 at 12:45:20PM +0530, kajoljain wrote:
> 
> 
> On 6/28/21 3:47 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.
> > 
> 
> Adding stable@...r.kernel.org in cc list as suggested by Moritz Fischer.


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>