From owner-freebsd-hackers  Thu Feb 25 12: 3:44 1999
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Date: Thu, 25 Feb 1999 12:03:24 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <199902252003.MAA08737@apollo.backplane.com>
To: Luoqi Chen <luoqi@watermarkgroup.com>, dfr@nlsystems.com,
	freebsd-hackers@FreeBSD.ORG, mjacob@feral.com
Subject: Re: Panic in FFS/4.0 as of yesterday - update
References: <199902231444.JAA02311@lor.watermarkgroup.com> <199902231848.KAA51270@apollo.backplane.com> <199902250916.BAA02250@apollo.backplane.com>
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    This is very messy, so only hard-core kernel hackers should try this.
    This should solve the getnewbuf problems, but it required some significant
    rewriting to re-encapsulate the free/dirty/bufferspace accounting,
    implement emergency reserves for the updateproc, and to fix NFS.

	    http://freefall.freebsd.org/~dillon/getnewbuf-diff.txt

    This is not well tested yet.  IT MAY BLOW UP YOUR MACHINE!   However,
    I think it is very close to ideal.  If there are bugs, they are going
    to be simple-stupid things rather then design issues.

    This patch contains a bunch of other cruft from other things, but
    mainly bug fixes.  The size of struct buf also changes ( due to one
    of the pieces of cruft ).  I didn't want to strip this stuff out because
    then it will not patch cleanly into -current for the people trying to
    test the getnewbuf() problem.   If you want, though, you can remove
    the struct chain_info junk from the sys/buf.h portion of the patch.  It's
    part of the new VN device's direct-swap support ( not yet committed ).

					-Matt




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