Date: Tue, 17 Mar 2009 15:24:26 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Paolo Pisati <p.pisati@oltrelinux.com> Cc: Barney Cordoba <barney_cordoba@yahoo.com>, current@freebsd.org Subject: Re: Interrupt routine usage not shown by top in 8.0 Message-ID: <alpine.BSF.2.00.0903171524040.55043@fledge.watson.org> In-Reply-To: <49BFB340.9050909@oltrelinux.com> References: <929422.83072.qm@web63908.mail.re1.yahoo.com> <alpine.BSF.2.00.0903171359590.55043@fledge.watson.org> <49BFB340.9050909@oltrelinux.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, 17 Mar 2009, Paolo Pisati wrote: > perhaps i misunderstood your question, but i'll try to explain a bit: > > before 7.0, bus_setup_intr() took just one function thus you could have an > INTR_FAST or an INTR_MPSAFE handler, and you choose the kind of handler via > a flag (INTR_FAST in this case). > > after 7.0, bus_setup_intr() took 2 functions, thus you could have: a fast > handler (aka filter), or an ithread handler (aka mpsafe), or a fast + > ithread handler (available only with INTR_FILTER turned on). > > in bus_setup_intr() the first function pointer is for the filter side of the > handler, while the second pointer is for the ithread part, and if you > declare both you can filter events (interrupts) and call the rest of the > device driver (the ithread part) after the filter has recognized and > acknowledged&masked the interrupt. This clarifies my misunderstanding, thanks! Robert N M Watson Computer Laboratory University of Cambridge
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?alpine.BSF.2.00.0903171524040.55043>