From: Thomas Gleixner <tglx@linutronix.de>
To: Pingfan Liu <piliu@redhat.com>
Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
Waiman Long <longman@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Pierre Gondois <pierre.gondois@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Baoquan He <bhe@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Valentin Schneider <vschneid@redhat.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Joel Granados <joel.granados@kernel.org>
Subject: Re: [RFC 2/3] kernel/cpu: Mark nonboot cpus as inactive when shutting down nonboot cpus
Date: Wed, 29 Oct 2025 13:13:46 +0100 [thread overview]
Message-ID: <874irhvrb9.ffs@tglx> (raw)
In-Reply-To: <aQH8KJ8RsnzbLfN2@fedora>
On Wed, Oct 29 2025 at 19:36, Pingfan Liu wrote:
> On Tue, Oct 28, 2025 at 01:59:11PM +0100, Thomas Gleixner wrote:
>> If you freeze stuff there is nothing to do. Hibernation works exactly
>> that way without any magic hacks in a particular scheduling class, no?
>>
>
> There is a nuance: DL bandwidth represents a commitment, not necessarily
> the actual payload. Even a blocked DL task still occupies DL bandwidth.
> The system's DL bandwidth remains unchanged as long as the CPUs stay
> online, which is the case in hibernation.
No. Hibernation brings the non-boot CPUs down in order to create the
disk image.
Thanks,
tglx
next prev parent reply other threads:[~2025-10-29 12:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-22 12:13 [RFC 0/3] kexec: Force kexec to proceed under heavy deadline load Pingfan Liu
2025-10-22 12:13 ` [RFC 1/3] sched/deadline: Skip the deadline bandwidth check if kexec_in_progress Pingfan Liu
2025-10-22 12:13 ` [RFC 2/3] kernel/cpu: Mark nonboot cpus as inactive when shutting down nonboot cpus Pingfan Liu
2025-10-27 17:06 ` Thomas Gleixner
2025-10-28 2:51 ` Pingfan Liu
2025-10-28 12:59 ` Thomas Gleixner
2025-10-29 11:36 ` Pingfan Liu
2025-10-29 12:13 ` Thomas Gleixner [this message]
2025-10-29 13:39 ` Pingfan Liu
2025-10-22 12:13 ` [RFC 3/3] kexec_core: Promote the kexec to DL task Pingfan Liu
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=874irhvrb9.ffs@tglx \
--to=tglx@linutronix.de \
--cc=akpm@linux-foundation.org \
--cc=bhe@redhat.com \
--cc=dietmar.eggemann@arm.com \
--cc=joel.granados@kernel.org \
--cc=juri.lelli@redhat.com \
--cc=kexec@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=longman@redhat.com \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=pierre.gondois@arm.com \
--cc=piliu@redhat.com \
--cc=rafael.j.wysocki@intel.com \
--cc=rostedt@goodmis.org \
--cc=vincent.guittot@linaro.org \
--cc=vschneid@redhat.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.