svn commit: r204132 - in user/kib/vm6/sys: conf dev/md kern sys
ufs/ffs ufs/ufs vm
David Xu
davidxu at freebsd.org
Sun Feb 21 05:21:25 UTC 2010
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 Xu
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