Is it faster to call sched_bind() temporarily in acpi_cpu_notify() than locking around many places?
If we successfully sched_bind() to the subject CPU, I think we're guaranteed that the acpi_cpu_idle() is not running on that CPU. On Tue, 18 May 2010 16:04:07 +0200 Giovanni Trematerra <giovanni.tremate...@gmail.com> wrote: > On Sat, May 15, 2010 at 9:12 PM, Brandon Gooch > <jamesbrandongo...@gmail.com> wrote: > > On Thu, May 13, 2010 at 7:25 PM, Giovanni Trematerra > > <giovanni.tremate...@gmail.com> wrote: > >> On Thu, May 13, 2010 at 1:09 AM, Brandon Gooch > >> <jamesbrandongo...@gmail.com> wrote: > >>> On Wed, May 12, 2010 at 9:41 AM, Attilio Rao <atti...@freebsd.org> wrote: > >>>> 2010/5/12 David DEMELIER <demelier.da...@gmail.com>: > >>>>> I remove the patch, and built the kernel (I updated the src this > >>>>> morning) and it does not panic now. It's really odd. If it reappears > >>>>> soon I will tell you. > >>>> > >>>> I looked at the code with Giovanni and I have the feeling that the > >>>> race with the idle thread may still be fatal. > >>>> We need to fix that. > >>>> > >>>> Attilio > >>>> > >>> > >>> That seems to be the case, as my laptop shows about an 80-85 % chance > >>> of experiencing a panic if left idle for long-ish periods of time (2 > >>> to 4 hours). I usually rebuild world or big ports overnight, and more > >>> often than not I wake up to a panicked machine, same situation every > >>> time: > >>> > >>> ... > >>> rman_get_bushandle() at rman_get_bushandle+0x1 > >>> sched_idletd() at sched_idletd+0x123 > >>> fork_exit() at fork_exit+0x12a > >>> fork_trampoline() at fork_trampoline+0xe > >>> ... > >>> > >>> The kernel/userland is rebuilt, the ports are finished compiling -- > >>> it's in the time AFTER the completion of all tasks that the machine > >>> gets bored and tries to kill itself :) > >>> > >>> I have seen the AC adapter plug/unplug "hang" in the past on this > >>> laptop, but I never made the connection between the events, as > >>> nowadays my laptop usually stays plugged in :( > >>> > >>> Attilio, I hope you can track this one down, let me know if I can do > >>> anything to help or test... > >>> > >> > >> Attilio and I came up with this patch. It seems ready for stress > >> testing and review > >> Please test and report back. > >> > >> Thank you > >> > >> P.S: all the faults are only mine. > > > > I tried the patch, and my kernel panics I panic on boot. I have > > 8.5MB(!) of JPG images (6 of them) if anyone needs to see them. I'm > > looking for a place to post them, but if anyone wants, I can send via > > e-mail... > > Hi Brandon, > Could you please, try this new one? The panic at boot stage should be solved, > at least I tried on a 8-way machine and all went ok at boot. > Please, remove WITNESS_SKIPSPIN from your kernel config file. > This patch might be sub-optimal and contains style(9) error but if it > works we are > on the right way. > Let me know if it works for you. > > Thanks > > -- > Gianni > -- -|-__ 山本 拓 / YAMAMOTO, Taku | __ < <t...@tackymt.homeip.net> - A chicken is an egg's way of producing more eggs. - _______________________________________________ freebsd-acpi@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-acpi To unsubscribe, send any mail to "freebsd-acpi-unsubscr...@freebsd.org"