svn commit: r250411 - in head/sys: conf kern sys
Will Andrews
will at firepipe.net
Wed May 15 04:53:54 UTC 2013
On Sun, May 12, 2013 at 7:49 PM, John Baldwin <jhb at freebsd.org> wrote:
> Also, while LK_NOWITESS works fine for lockmgr's API (it already takes a
> flag
> argument), having that sort of thing in our other lock APIs is messier
> (they
> generally do not have flags). This is why a per-thread flag seemed
> simpler to
> me for this as you don't have to change umpteen locking APIs to add a new
> flags field.
>
Another problem is that approach is far too blunt; in most cases false
positive LORs are specific to a particular pair of instances of locks.
You'd probably still want to receive witness notifications for other LORs.
--Will.
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