From: Nathan Lynch <nathanl@linux.ibm.com>
To: Gautham R Shenoy <ego@linux.vnet.ibm.com>
Cc: Tyrel Datwyler <tyreld@linux.ibm.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Kamalesh Babulal <kamaleshb@in.ibm.com>,
linux-kernel@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
"Naveen N . Rao" <naveen.n.rao@linux.vnet.ibm.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede_offline
Date: Wed, 18 Sep 2019 12:08:43 -0500 [thread overview]
Message-ID: <874l19r0pw.fsf@linux.ibm.com> (raw)
In-Reply-To: <20190918123039.GA12534@in.ibm.com>
Gautham R Shenoy <ego@linux.vnet.ibm.com> writes:
> The accounting problem in tools such as lparstat with
> "cede_offline=on" is affecting customers who are using these tools for
> capacity-planning. That problem needs a fix in the short-term, for
> which Patch 1 changes the default behaviour of cede_offline from "on"
> to "off". Since this patch would break the existing userspace tools
> that use the CPU-Offline infrastructure to fold CPUs for saving power,
> the sysfs interface allowing a runtime change of cede_offline_enabled
> was provided to enable these userspace tools to cope with minimal
> change.
So we would be putting users in the position of choosing between folding
and correct accounting. :-(
Actually how does changing the offline mechanism to stop-self break the
folding utility?
next prev parent reply other threads:[~2019-09-18 17:11 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 10:35 [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede_offline Gautham R. Shenoy
2019-09-12 10:35 ` [PATCH 1/2] pseries/hotplug-cpu: Change default behaviour of cede_offline to "off" Gautham R. Shenoy
2019-09-12 10:35 ` [PATCH 2/2] pseries/hotplug-cpu: Add sysfs attribute for cede_offline Gautham R. Shenoy
2019-09-12 15:39 ` [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede_offline Nathan Lynch
2019-09-15 7:42 ` Gautham R Shenoy
2019-09-17 17:36 ` Nathan Lynch
2019-09-18 5:17 ` Michael Ellerman
2019-09-18 12:30 ` Gautham R Shenoy
2019-09-18 17:08 ` Nathan Lynch [this message]
2019-09-18 5:14 ` Michael Ellerman
2019-09-18 6:52 ` Naveen N. Rao
2019-09-18 11:31 ` Michael Ellerman
2019-09-18 13:38 ` Aneesh Kumar K.V
2019-09-18 16:24 ` Naveen N. Rao
2019-09-18 12:51 ` Gautham R Shenoy
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