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Re: [PATCH v2 06/11] migration: Introduce dirty-limit capability


From: Peter Xu
Subject: Re: [PATCH v2 06/11] migration: Introduce dirty-limit capability
Date: Tue, 29 Nov 2022 18:58:55 -0500

On Mon, Nov 21, 2022 at 11:26:38AM -0500, huangy81@chinatelecom.cn wrote:
> From: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
> 
> Introduce migration dirty-limit capability, which can
> be turned on before live migration and limit dirty
> page rate durty live migration.
> 
> Introduce migrate_dirty_limit function to help check
> if dirty-limit capability enabled during live migration.
> 
> Meanwhile, refactor vcpu_dirty_rate_stat_collect
> so that period can be configured instead of hardcoded.
> 
> dirty-limit capability is kind of like auto-converge
> but using dirty limit instead of traditional cpu-throttle
> to throttle guest down. To enable this feature, turn on
> the dirty-limit capability before live migration using
> migratioin-set-capabilities, and set the parameters
> "x-vcpu-dirty-limit-period", "vcpu-dirty-limit" suitably
> to speed up convergence.
> 
> Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>

Acked-by: Peter Xu <peterx@redhat.com>

PS: please replace 7.1 with 7.3 in this patch and the previous one.

-- 
Peter Xu




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