Date: Sun, 21 Feb 2010 13:21:10 +0800 From: David Xu <davidxu@freebsd.org> To: Konstantin Belousov <kib@freebsd.org> Cc: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: Re: svn commit: r204132 - in user/kib/vm6/sys: conf dev/md kern sys ufs/ffs ufs/ufs vm Message-ID: <4B80C2C6.8090902@freebsd.org> In-Reply-To: <201002201634.o1KGYg2f057928@svn.freebsd.org> References: <201002201634.o1KGYg2f057928@svn.freebsd.org>
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Konstantin Belousov wrote: > Author: kib > Date: Sat Feb 20 16:34:42 2010 > New Revision: 204132 > URL: http://svn.freebsd.org/changeset/base/204132 > > Log: > Implementation of range locking for i/o and vm i/o. > > First vm_readwrite.c implementation by: jeff > In collaboration with: pho The range locking is confusing, if there are thread A,B and C, if A reads range 0-100, B writes range 0-100, C reads 200-300, why should C waits before B is guaranteed ? C should be able to freely read its data. Regards, David Xuhelp
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