Fw: Re: Implemented OPLOCK for FreeBsd

Jonathan Lemon jlemon at flugsvamp.com
Fri Sep 7 20:02:23 GMT 2001

On Fri, Sep 07, 2001 at 06:14:19PM -0700, Jeremy Allison wrote:
> Yep - see my other message. So this really boils down to
> POSIX.4 signals have a resource limit tunable, kqueues
> don't. Firstly, doesn't that expose the kernel to a DOS
> attack if you don't have a per-process limit. If you do,
> then hurrah - you've just re-invented the max queue kernel
> tunable.

Not quite.  The difference is that one has the failures 
reported synchronously, up front, at the time you try to 
tell the kernel what you want to do.  The second one fails
silently, droopping kernel events without notification if
you happen to overflow the queue limit.

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