Re: svs_pmap_sync() svs_pdir_switch() overhead

To: Andrew Doran <ad%netbsd.org@localhost>
Subject: Re: svs_pmap_sync() svs_pdir_switch() overhead
From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Date: Wed, 20 May 2020 11:12:55 +0200

On Tue, May 19, 2020 at 10:51:52PM +0000, Andrew Doran wrote:
> Both of these show up prominently in profiling for me.  This change largely
> cures it:
> 
> 	http://www.netbsd.org/~ad/2020/svs.diff
> 
> Comments?

I also noticed that the cost is very high on Xen PVH/PVHVM domUs,
at last with ~10 year old hardware.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--

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  - From: Maxime Villard

References:
- svs_pmap_sync() svs_pdir_switch() overhead
  - From: Andrew Doran

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