Date: Wed, 27 Feb 2002 10:04:06 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: peter@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: you broke current in some weird way... etc Message-ID: <3C7D1F96.DC3969B7@mindspring.com> References: <95075.1014756753@critter.freebsd.dk> <200202271733.g1RHXmh27846@apollo.backplane.com> <3C7D1A14.C3390B6C@mindspring.com> <200202271747.g1RHlOD27988@apollo.backplane.com>
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Matthew Dillon wrote: > :> I'm just going to use this opportunity to plug the concept of temporary > :> sysctl-instrumentation for a commit like this. > : > :Overall, this is a good idea. However, it can't apply to > :any code that runs before init_main.c runs the SI_SUB_TUNABLES. > > Sure it does, because it means you can simply commit a change to the > default assignment for that sysctl rather then backing the whole thing > out to unbreak the general developer community. That saves a lot of > time and removes the 'oh hell, I have to track this down quickly!' > pressure. > > Sometimes features in early boot can be adjusted by breaking into DDB > and w/l changing the sysctl variable, but perhaps not in this case. Definitely not in this case. Similarly, there are a number of early allocations that occur by declaration, rather than by process, where the page mappings are then established post-facto, where it won't work. I really need to publish my "early life of FreeBSD" article. 8-(. I have all my extensive notes together, but I think it's at least a three-parter, and I need to expand the examples. I'll get around to it eventually, I promise. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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