linux-kernel - Re: [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede

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Date:   Wed, 18 Sep 2019 19:08:12 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>
Cc:     Kamalesh Babulal <kamaleshb@...ibm.com>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: Re: [PATCH 0/2] pseries/hotplug: Change the default behaviour of
 cede_offline

On 9/18/19 5:01 PM, Michael Ellerman wrote:
> "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> writes:
>> Michael Ellerman wrote:
>>> "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com> writes:
>>>> From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
>

....

>> Also, since we expose [S]PURR through sysfs, any tools that make use of
>> that directly are also affected due to this.
> 
> But again if we've had the current behaviour for 10 years then arguably
> that's now the correct behaviour.

Or nobody is looking at PURR based accounting/usage metric on Linux. We 
got some customers complaining about this recently once they started 
using the metric.

-aneesh