From: "Jan Beulich" <JBeulich@suse.com>
To: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Wei Liu <wei.liu2@citrix.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Dario Faggioli <dfaggioli@suse.com>,
Julien Grall <julien.grall@arm.com>,
xen-devel <xen-devel@lists.xenproject.org>,
Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [PATCH v3 1/6] xen/sched: call cpu_disable_scheduler() via cpu notifier
Date: Tue, 02 Apr 2019 05:54:17 -0600 [thread overview]
Message-ID: <5CA34D690200007800223DF4@prv1-mh.provo.novell.com> (raw)
In-Reply-To: <20190402053457.24912-2-jgross@suse.com>
>>> On 02.04.19 at 07:34, <jgross@suse.com> wrote:
> cpu_disable_scheduler() is being called from __cpu_disable() today.
> There is no need to execute it on the cpu just being disabled, so use
> the CPU_DEAD case of the cpu notifier chain. Moving the call out of
> stop_machine() context is fine, as we just need to hold the domain RCU
> lock and need the scheduler percpu data to be still allocated.
>
> Add another hook for CPU_DOWN_PREPARE to bail out early in case
> cpu_disable_scheduler() would fail. This will avoid crashes in rare
> cases for cpu hotplug or suspend.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>
> Reviewed-by: Dario Faggioli <dfaggioli@suse.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
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next prev parent reply other threads:[~2019-04-02 11:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-02 5:34 [PATCH v3 0/6] xen: simplify suspend/resume handling Juergen Gross
2019-04-02 5:34 ` [PATCH v3 1/6] xen/sched: call cpu_disable_scheduler() via cpu notifier Juergen Gross
2019-04-02 9:54 ` Julien Grall
2019-04-02 11:54 ` Jan Beulich [this message]
2019-04-02 5:34 ` [PATCH v3 2/6] xen: add helper for calling notifier_call_chain() to common/cpu.c Juergen Gross
2019-04-02 11:54 ` Jan Beulich
2019-04-02 5:34 ` [PATCH v3 3/6] xen: add new cpu notifier action CPU_RESUME_FAILED Juergen Gross
2019-04-02 5:34 ` [PATCH v3 4/6] xen: don't free percpu areas during suspend Juergen Gross
2019-04-02 11:57 ` Jan Beulich
2019-04-02 12:26 ` Juergen Gross
2019-04-02 5:34 ` [PATCH v3 5/6] xen/cpupool: simplify suspend/resume handling Juergen Gross
2019-04-02 5:34 ` [PATCH v3 6/6] xen/sched: don't disable scheduler on cpus during suspend Juergen Gross
2019-04-02 15:47 ` [PATCH v3 0/6] xen: simplify suspend/resume handling Andrew Cooper
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