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Re: [Xen-devel] [PATCH v3 0/6] xen: simplify suspend/resume handling
- To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 2 Apr 2019 16:47:36 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 02 Apr 2019 16:12:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 02/04/2019 06:34, Juergen Gross wrote:
> Especially in the scheduler area (schedule.c, cpupool.c) there is a
> rather complex handling involved when doing suspend and resume.
>
> This can be simplified a lot by not performing a complete cpu down and
> up cycle for the non-boot cpus, but keeping the pure software related
> state and freeing it only in case a cpu didn't come up again during
> resume.
>
> In summary not only the complexity can be reduced, but the failure
> tolerance will be even better with this series: With a dedicated hook
> for failing cpus when resuming it is now possible to survive e.g. a
> cpupool being left without any cpu after resume by moving its domains
> to cpupool0.
>
> Juergen Gross (6):
> xen/sched: call cpu_disable_scheduler() via cpu notifier
> xen: add helper for calling notifier_call_chain() to common/cpu.c
> xen: add new cpu notifier action CPU_RESUME_FAILED
> xen: don't free percpu areas during suspend
> xen/cpupool: simplify suspend/resume handling
> xen/sched: don't disable scheduler on cpus during suspend
So I came to try and commit this series. However,
[root@fusebot ~]# xen-hptool cpu-offline 1
Prepare to offline CPU 1
CPU 1 offline failed (error 11: Resource temporarily unavailable)
[root@fusebot ~]# xen-hptool cpu-offline 2
Prepare to offline CPU 2
CPU 2 offline failed (error 11: Resource temporarily unavailable)
[root@fusebot ~]#
Something here has regressed all ability to hotplug. Its not
immediately obvious what.
~Andrew
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