Date: Sat, 30 Aug 1997 12:03:16 -0600 From: Steve Passe <smp@csn.net> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: smp@freebsd.org Subject: Re: HEADS UP: another set of changes. Message-ID: <199708301803.MAA16417@Ilsa.StevesCafe.com> In-Reply-To: Your message of "Sat, 30 Aug 1997 16:13:00 %2B0200." <6664.872950380@critter.freebsd.dk>
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Hi, > >We're at the point where deadlocks are going to become common. Bear with me > >and help as you can. When you hit one please record all the facts you can, > >and report them to smp@freebsd.org. Hopefully we will get thru this period > >before too long... > > I pressume that we want to instrument simplelock carefully in the > #ifdef DIAGNOSTIC case ? It would be really nice, any one with ideas along that line please speak up (or go for it!). One idea I had was to use the local timer as a watchdog. set it for 10 seconds going into a simplelock. if your not out by then if fires a high priority interrupt that causes a panic. the SMP disable_intr() would have to be reworked a little, and there are probably other areas like ISRs that would ignore it, but it should help some of the time. -- Steve Passe | powered by smp@csn.net | Symmetric MultiProcessor FreeBSD
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