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Re: [PATCH] memory: bail from page scrubbing when CPU is no longer online
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 28 Jan 2021 10:37:05 +0000
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- Cc: George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Thu, 28 Jan 2021 10:37:20 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28/01/2021 10:35, Jan Beulich wrote:
> Scrubbing can significantly delay the offlining (parking) of a CPU (e.g.
> because of booting into in smt=0 mode), to a degree that the "CPU <n>
> still not dead..." messages logged on x86 in 1s intervals can be seen
> multiple times. There are no softirqs involved in this process, so
> extend the existing preemption check in the scrubbing logic to also exit
> when the CPU is no longer observed online.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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