lkml.org 
[lkml]   [2006]   [Dec]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: workqueue deadlock
On Sun, Dec 10, 2006 at 03:18:38PM +0100, Rafael J. Wysocki wrote:
> On Sunday, 10 December 2006 13:16, Andrew Morton wrote:
> > On Sun, 10 Dec 2006 12:49:43 +0100
>
> Hm, currently we're using the CPU hotplug to disable the nonboot CPUs before
> the freezer is called. ;-)
>
> However, we're now trying to make the freezer SMP-safe, so that we can disable
> the nonboot CPUs after devices have been suspended (we want to do this for
> some ACPI-related reasons). In fact we're almost there, I'm only waiting for
> the confirmation from Pavel to post the patches.
>
> When this is done, we won't need the CPU hotplug that much and I think the CPU
> hotplug code will be able to do something like:
>
> freeze_processes
> suspend_cpufreq (or even suspend_all_devices)
> remove_the_CPU_in_question
> resume_cpufreq
> thaw_processes

Have you thought about how much time this might take on
a machine with say - 128 CPUs of which I want to dynamically
reconvigure 64 of them and make a new partition ? Assume
10,000 tasks are running in the system.

Thanks
Dipankar
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-12-11 07:55    [W:0.051 / U:1.496 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site