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svs_pmap_sync() svs_pdir_switch() overhead

To: port-amd64%netbsd.org@localhost
Subject: svs_pmap_sync() svs_pdir_switch() overhead
From: Andrew Doran <ad%netbsd.org@localhost>
Date: Tue, 19 May 2020 22:51:52 +0000

Both of these show up prominently in profiling for me.  This change largely
cures it:

	http://www.netbsd.org/~ad/2020/svs.diff

Comments?

Thanks,
Andrew

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