Date: Thu, 13 Aug 2009 11:32:44 +0100 From: Andrew Thompson <thompsa@FreeBSD.org> To: Kostik Belousov <kostikbel@gmail.com> Cc: current@freebsd.org, Hans Petter Selasky <hselasky@c2i.net> Subject: Re: usb kthreads Message-ID: <1280352d0908130332j1487ad09t79fe0e33433021ef@mail.gmail.com> In-Reply-To: <20090813101044.GV1884@deviant.kiev.zoral.com.ua> References: <20090813073002.GA66860@citylink.fud.org.nz> <20090813082318.GP1884@deviant.kiev.zoral.com.ua> <1280352d0908130209m21ae1d48ud2881e84b5e18a78@mail.gmail.com> <20090813101044.GV1884@deviant.kiev.zoral.com.ua>
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2009/8/13 Kostik Belousov <kostikbel@gmail.com>: > On Thu, Aug 13, 2009 at 10:09:37AM +0100, Andrew Thompson wrote: >> 2009/8/13 Kostik Belousov <kostikbel@gmail.com> >> > >> > On Thu, Aug 13, 2009 at 12:30:02AM -0700, Andrew Thompson wrote: >> > > Hi, >> > > >> > > >> > > Here is an aesthetic patch to change the usb kernel processes to threads, >> > > this hides them from the usual 'ps' output. Please test and review. >> > > >> > > 1290 ?? DL 0:00.00 [usbus0] >> > > [lots and lots more...] >> > > 1309 ?? DL 0:00.00 [usbus4] >> > > >> > > After the patch they can be seen as kernel threads. >> > > >> > > PID TID COMM TDNAME CPU PRI STATE WCHAN >> > > 0 100000 kernel swapper 0 68 sleep sched >> > > 0 100009 kernel firmware taskq 0 92 sleep - >> > > 0 100020 kernel kqueue taskq 0 92 sleep - >> > > 0 100021 kernel acpi_task_0 0 92 sleep - >> > > 0 100022 kernel acpi_task_1 0 92 sleep - >> > > 0 100023 kernel acpi_task_2 0 92 sleep - >> > > 0 100027 kernel thread taskq 0 92 sleep - >> > > 0 100031 kernel bwi0 taskq 0 16 sleep - >> > > 0 100032 kernel bwi0 taskq 0 16 sleep - >> > > 0 100106 kernel usbus0 0 20 sleep wmsg >> > > 0 100107 kernel usbus0 0 16 sleep wmsg >> > > 0 100108 kernel usbus0 0 20 sleep wmsg >> > > 0 100109 kernel usbus0 0 20 sleep wmsg >> > > [ ... ] >> > > 0 100127 kernel usbus4 0 20 sleep wmsg >> > > >> > Can you use this opportunity to change "wmsg" wait channel name >> > to something having "usb" in the name ? >> >> When the thread is idle this should be `-` ? > > Taskqueue loop uses "-" as a name for the wait channel used when no work is > scheduled, see subr_taskqueue.c:404. > Since the usb thread also uses a taskqueue-like system I will make it the same. Andrew
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