Messages in this thread | | | Date | Sat, 12 May 2007 05:01:17 +0400 | From | Oleg Nesterov <> | Subject | Re: [PATCH 1/7] Freezer: Read PF_BORROWED_MM in a nonracy way |
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On 05/12, Oleg Nesterov wrote: > > Do we need freezer? Should we freeze kernel threads? I can't judge. I tried > to read a long thread about suspend, and failed to understand it. > > I personally think we can simplify things if CPU-hotplug use freezer, at least.
Just a small example,
debug_smp_processor_id:
/* * Kernel threads bound to a single CPU can safely use * smp_processor_id(): */ this_mask = cpumask_of_cpu(this_cpu);
if (cpus_equal(current->cpus_allowed, this_mask)) goto out;
This is not true with CONFIG_HOTPLUG_CPU. This becomes true if we freeze the kernel threads from CPU_DOWN_PREPARE to CPU_DEAD.
Oleg.
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