From: sashiko-bot@kernel.org
To: "Yury Norov" <ynorov@nvidia.com>
Cc: linux-s390@vger.kernel.org, "Heiko Carstens" <hca@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>
Subject: Re: [PATCH 1/6] sched: decouple PREFERRED_CPU from PARAVIRT in Kconfig.preempt
Date: Sun, 01 Nov 2026 19:28:34 +0000 [thread overview]
Message-ID: <sashiko-outbox-192601@kernel.org> (raw)
In-Reply-To: <20261101192203.6979-2-ynorov@nvidia.com>
> The IBM s390 doesn't enable PARAVIRT config for their hardware
> virtualized Logical Partitions (LPAR). However, the steal time is
> accounted for the LPARs, once the config VIRT_CPU_ACCOUNTING_NATIVE
> is enabled.
>
> Preferred cpumask doesn't rely on any feature gated by PARAVIRT config,
> and requires it to minimize the configuration space and runtime overhead,
> with the lack of non-paravirt user. Now that s390 wants to adopt preferred
> cpumask, there's no reason to keep it coupled to paravirt.
>
> Make PREFERRED_CPU a user-configurable option, even if paravirtualization
> is not enabled, and drop PARAVIRT dependency on the steal governor.
>
> Keep the default module selection conditional on PARAVIRT so other SMP
> configurations can opt in without enabling the governor by default.
>
> Link: https://lore.kernel.org/all/4605dad5-aab2-49e3-b919-bf9897181834@linux.ibm.com/
> CC: Mete Durlu <meted@linux.ibm.com>
> Signed-off-by: Yury Norov <ynorov@nvidia.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261101192203.6979-1-ynorov@nvidia.com?part=1
next prev parent reply other threads:[~2026-11-01 19:28 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-01 19:21 [PATCH 0/6] sched: Expose writable interface for preferred CPUs mask Yury Norov
2026-11-01 19:21 ` [PATCH 1/6] sched: decouple PREFERRED_CPU from PARAVIRT in Kconfig.preempt Yury Norov
2026-11-01 19:28 ` sashiko-bot [this message]
2026-11-02 10:16 ` Ilya Leoshkevich
2026-11-02 11:00 ` Peter Zijlstra
2026-11-02 11:34 ` Ilya Leoshkevich
2026-11-02 13:00 ` Shrikanth Hegde
2026-11-02 13:41 ` Ilya Leoshkevich
2026-11-02 14:57 ` Shrikanth Hegde
2026-11-01 19:21 ` [PATCH 2/6] cpumask: Add reset_preferred_cpumask() helper Yury Norov
2026-11-01 19:28 ` sashiko-bot
2026-11-01 19:21 ` [PATCH 3/6] sched: Restore preferred CPUs when hotplug removes the last one Yury Norov
2026-11-01 19:32 ` sashiko-bot
2026-11-01 19:22 ` [PATCH 4/6] sched: serialize preferred cpumask update better Yury Norov
2026-11-01 19:32 ` sashiko-bot
2026-11-01 19:22 ` [PATCH 5/6] virt: steal_governor: Warn on unexpected preferred mask states Yury Norov
2026-11-01 19:36 ` sashiko-bot
2026-11-01 19:22 ` [PATCH 6/6] cpu: Add per-CPU preferred sysfs control Yury Norov
2026-11-01 19:40 ` sashiko-bot
2026-11-02 8:47 ` [PATCH 0/6] sched: Expose writable interface for preferred CPUs mask Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=sashiko-outbox-192601@kernel.org \
--to=sashiko-bot@kernel.org \
--cc=agordeev@linux.ibm.com \
--cc=borntraeger@linux.ibm.com \
--cc=gor@linux.ibm.com \
--cc=hca@linux.ibm.com \
--cc=linux-s390@vger.kernel.org \
--cc=sashiko-reviews@lists.linux.dev \
--cc=ynorov@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.