Date: Wed, 21 Mar 2001 14:24:53 -0800 From: Mike Smith <msmith@freebsd.org> To: Matt Dillon <dillon@earth.backplane.com> Cc: arch@FreeBSD.ORG Subject: Re: remind me again, why is MAXPHYS only 128k ? Message-ID: <200103212224.f2LMOrh02530@mass.dis.org> In-Reply-To: Your message of "Wed, 21 Mar 2001 14:15:44 PST." <200103212215.f2LMFig23991@earth.backplane.com>
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> Another possibility for physio would be to MALLOC the pages
> array at the very top level of the syscall and pass it down
> through for use by lower layers. At the very top level,
> before anything is locked, the MALLOC can block safely.
This would deal with the async physio case too.
I'm wondering how all this will interact with the general desire to avoid
mapping an I/O request into linear KVM before handing it to a driver; I
suspect probably not a lot...
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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