[lkml]   [2005]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: PATCH: Fix race in cpu_down (hotplug cpu)

On Mon, 2005-09-19 at 15:57, Srivatsa Vaddagiri wrote:
> On Mon, Sep 19, 2005 at 01:31:27PM +0800, Shaohua Li wrote:
> > A CPU is idle and then is preempted and starting offline CPU. After
> > calling stop_machine_run, the CPU goes into idle and it will resume last
> > idle loop. If the CPU is broken at specific point, then the CPU will
> > continue executing previous idle and have no chance to call play_dead.
> Ok, that makes sense. Nigel, could you confirm which idle routine you are
> using?

>From dmesg:

monitor/mwait feature present.
using mwait in idle threads.

> > Am I missing anything? Nigel's patch seems can fix the situation for
> > mwait_idle and poll_idle but can't fix for default_idle in i386 to me.
> I would say the right fix here is for poll_idle and mwait_idle (& similar
> other idle routines) to monitor 'cpu_offline' flag in addition to need_resched
> flag, rather than what Nigel has suggested.

Ok, but what about default_idle?



To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-09-19 08:13    [W:0.089 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site