On 04/06, Eric W. Biederman wrote:
>
> Oleg Nesterov <[email protected]> writes:
>
> > Robin Holt wrote:
> >>
> >> wait_task_zombie() is taking many seconds to get through the list.
> >> For the case of a modprobe, stop_machine creates one thread per cpu
> >> (remember big number). All are parented to init and their exit will
> >> cause wait_task_zombie to scan multiple times most of the way through
> >> this very long list looking for threads which need to be reaped.
> >
> > Could you try this patch
> >
> > http://marc.info/?l=linux-kernel&m=117337194209912
> >
> > ?
> >
> > It can't solve the whole problem, but at least an exiting kernel thread
> > won't kick init.
>
> At first glance your patch looks reasonable.
>
> Unfortunately it only applies to the rare thread that calls daemonize,
> and not also to kernel/kthread/kthread() which means it will miss many of
> our current kernel threads.
Note that a thread created by kthread_create() has ->parent == "[kthread]",
not /sbin/init (unless it was created before core_initcall). So I don't really
understand how stop_machine() creates the threads parented to init.
> For the sgi problem I doubt it is will make a difference
most probably you are right.
Oleg.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]