On Tuesday 19 October 2004 12:01 pm, Kris Kennaway wrote: > On Tue, Oct 19, 2004 at 09:13:26AM -0400, Robert Huff wrote: > > Brian Fundakowski Feldman writes: > > > You should never not run with WITNESS_SKIPSPIN if you use > > > modules. Any spin mutexes not listed statically in the witness > > > code will cause your machine to immediately panic. > > > > If this is true (and I'm not disputing it), shouldn't it be > > noted in GENERIC and/or NOTES? For that matter, what's the penalty > > for not automatically including it as part of WITNESS? > > Sometimes you don't want to use it, e.g. if you actually want to trace > spinlock operations with witness. True spin mutexes should be rarely used anyways, so I don't think modules needing spin mutexes is all that big of an issue. Almost all mutexes should just be regular mutexes. -- John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/Received on Tue Oct 19 2004 - 19:13:19 UTC
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