Subject: Re: M_EXT_PAGES
To: YAMAMOTO Takashi <email@example.com>
From: Jason Thorpe <firstname.lastname@example.org>
Date: 06/05/2004 13:50:14
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On Jun 5, 2004, at 12:47 AM, YAMAMOTO Takashi wrote:
> currently, ext_pgs is merely used as a hint for sodopendfreel().
> i'd like to change it to be used by bus_dmamap_load_mbuf() as well.
> (x86 diff is attached)
This is great; I wholeheartedly support this patch. I intended this
usage for ext_pgs, but simply never had a chance to implement this
> while i think that the change itsself has its own benefits,
> eventual goals are:
> - delay pmap_kenter_pa() until it's really needed.
> (likely on the first mtod()?)
> if you're lucky enough, no pmap_kenter_pa() is needed at all.
Yes, this could really help both MP systems as well as systems with a
virtually indexed cache.
> - use mbufs (or something similar) for disk i/o.
YES! I would love to see mbuf chain support in the bio subsystem. It
could be especially helpful for network storage protocols (including
-- Jason R. Thorpe <email@example.com>
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