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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?

WARNING: multiple messages have this Message-ID (diff)
From: Nathan Lynch <nathanl@linux.ibm.com>
To: Gautham R Shenoy <ego@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
	Kamalesh Babulal <kamaleshb@in.ibm.com>,
	"Naveen N . Rao" <naveen.n.rao@linux.vnet.ibm.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Tyrel Datwyler <tyreld@linux.ibm.com>
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?

  reply	other threads:[~2019-09-18 17:11 UTC|newest]

Thread overview: 30+ 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 ` 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   ` 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 10:35   ` Gautham R. Shenoy
2019-09-12 15:39 ` [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede_offline Nathan Lynch
2019-09-12 15:39   ` Nathan Lynch
2019-09-15  7:42   ` Gautham R Shenoy
2019-09-15  7:42     ` Gautham R Shenoy
2019-09-17 17:36     ` Nathan Lynch
2019-09-17 17:36       ` Nathan Lynch
2019-09-18  5:17       ` Michael Ellerman
2019-09-18  5:17         ` Michael Ellerman
2019-09-18 12:30       ` Gautham R Shenoy
2019-09-18 12:30         ` Gautham R Shenoy
2019-09-18 17:08         ` Nathan Lynch [this message]
2019-09-18 17:08           ` Nathan Lynch
2019-09-18  5:14 ` Michael Ellerman
2019-09-18  5:14   ` Michael Ellerman
2019-09-18  6:52   ` Naveen N. Rao
2019-09-18  6:52     ` Naveen N. Rao
2019-09-18 11:31     ` Michael Ellerman
2019-09-18 11:31       ` Michael Ellerman
2019-09-18 13:38       ` Aneesh Kumar K.V
2019-09-18 13:38         ` Aneesh Kumar K.V
2019-09-18 16:24       ` Naveen N. Rao
2019-09-18 16:24         ` Naveen N. Rao
2019-09-18 12:51   ` Gautham R Shenoy
2019-09-18 12:51     ` Gautham R Shenoy

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