Date: Tue, 23 Jan 2001 12:12:18 -0800 (PST) From: John Baldwin <jhb@FreeBSD.ORG> To: Alfred Perlstein <bright@wintelcom.net> Cc: arch@FreeBSD.ORG, Bosko Milekic <bmilekic@dsuper.net> Subject: Re: Second zone allocator patch Message-ID: <XFMail.010123121218.jhb@FreeBSD.org> In-Reply-To: <20010123120604.Y26076@fw.wintelcom.net>
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On 23-Jan-01 Alfred Perlstein wrote: > * John Baldwin <jhb@FreeBSD.ORG> [010123 11:53] wrote: >> >> On 23-Jan-01 Bosko Milekic wrote: >> >> hardware interrupt handler blocking and stalling other interrups, >> >> Jake and I have toyed with the notion of creating a new kthread >> >> to run the other handlers when an ithread blocks on a mutex, so >> >> that the other handlers wouldn't be broken. For hardware >> >> interrupts, this would require a refcount on the intrhand >> >> "interrupt source" so that the interrupt can be re-enabled when >> >> the refcount hits 0. However, this is only in conceptual stage >> >> right now, and as an optimizaation, is a bit down the priority >> >> list. >> > >> > Icky. I would have thought that there would have been an >> > alternative way >> > to solving this. But let's wait until we're ready. >> >> No more icky than light weight ithread switches. Much less, in >> fact. > > afaik, most software interrupts are basically there to process > queues. Rewrite the code to use a taskqueue(9) then. :) And then have the software interrupt handler manage your worker thread pool. That is an orthogonal problem to hanging multiple handlers off an interrupt thread and wanting one handler blocking to not result in all handlers blocking. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.Baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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