Re: [RFC] Fix SMP brokenness for PF_FREEZE and make freezing usable for other purposes

[Ray Bryant <raybry@engr.sgi.com>]

Hi Pavel,

Pavel Machek wrote:

> 
> Should be very easy to solve with one semaphore. Simply make swsusp
> wait until all migrations are done.  
>

This may not be needed.  If I understand things correctly, the system
won't suspsend until all tasks have returned from system calls and end
up in the refrigerator.  So if a memory migration is  running when
someone tries to suspend the system, the suspend won't
occur until the memory migration system call returns.

Is that correct?

What happens if a system call calls schedule() (or otherwise gets blocked,
e. g. by trying to obtain a semaphore?)

-- 
Best Regards,
Ray
-----------------------------------------------
                   Ray Bryant
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