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Home » Mailing list archives » netbsd-tech-kern » 2007 » February » 23

Re: Interrupt, interrupt threads, continuations, and kernel lwps

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From: M. Warner Losh <imp@...>
To: <ad@...>
Cc: <wrstuden@...>, <jonathan@...>, <tech-kern@...>
Subject: Re: Interrupt, interrupt threads, continuations, and kernel lwps
Date: Friday, February 23, 2007 - 2:33 pm

In message: <20070222205430.GA25309@hairylemon.org>
            Andrew Doran <ad@NetBSD.org> writes:
: What Jonathan is describing is roughly how FreeBSD works, I think. When the
: interrupt comes in, mi_switch() is called to dispatch it. The thread that
: was running when the interrupt came in gets kicked off the CPU.

At least until this morning... :-)

Filters were just committed to the tree that divide the ISR into two
parts.  A fast running part (the filter) that turns off the interrupt
source in the device or otherwise services the interrupt, and a
scheduled part (the ithread) that runs if the filter says to run it.
By default, ISRs with no filter always have their ithread run.  This
also eliminates the FAST_INTERRUPT special case because now all
filters are fast interrupt hanlders (in the 5.x and later sense, not
in the older 4.x and prior sense).

Warner
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Messages in current thread:
Interrupt, interrupt threads, continuations, and kernel lwps, Matt Thomas, (Wed Feb 21, 4:08 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Jason Thorpe, (Wed Feb 21, 2:01 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Wed Feb 21, 6:51 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bill Studenmund, (Wed Feb 21, 7:42 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., , (Wed Feb 21, 9:57 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Thu Feb 22, 12:16 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., , (Thu Feb 22, 1:13 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Joerg Sonnenberger, (Thu Feb 22, 5:59 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Thu Feb 22, 5:24 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bill Studenmund, (Thu Feb 22, 1:46 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., , (Thu Feb 22, 8:49 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bill Studenmund, (Fri Feb 23, 12:27 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., David Laight, (Fri Feb 23, 5:18 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bucky Katz, (Fri Feb 23, 12:37 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bill Studenmund, (Fri Feb 23, 1:01 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bucky Katz, (Fri Feb 23, 2:33 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., David Laight, (Fri Feb 23, 5:09 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bucky Katz, (Fri Feb 23, 5:43 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., , (Fri Feb 23, 6:23 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bucky Katz, (Fri Feb 23, 8:00 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bucky Katz, (Thu Feb 22, 9:30 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Jason Thorpe, (Thu Feb 22, 9:11 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Thu Feb 22, 4:54 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., M. Warner Losh, (Fri Feb 23, 2:33 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Lars Heidieker, (Thu Feb 22, 7:45 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bill Studenmund, (Thu Feb 22, 1:48 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Thu Feb 22, 12:44 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Jason Thorpe, (Thu Feb 22, 1:24 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Steven M. Bellovin, (Wed Feb 21, 10:21 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Allen Briggs, (Wed Feb 21, 10:14 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., , (Wed Feb 21, 10:39 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., haad, (Wed Feb 21, 7:59 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Thu Feb 22, 12:51 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Wed Feb 21, 6:09 am)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Jason Thorpe, (Wed Feb 21, 2:05 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Wed Feb 21, 6:59 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Jason Thorpe, (Wed Feb 21, 7:01 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Wed Feb 21, 7:44 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Bill Studenmund, (Wed Feb 21, 1:50 pm)
Re: Interrupt, interrupt threads, continuations, and kernel ..., Andrew Doran, (Wed Feb 21, 5:12 pm)

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