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

Ray Bryant
2005-06-27T14:59:33Z

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
512-453-9679 (work) 512-507-7807 (cell)
raybry@sgi.com raybry@austin.rr.com
The box said: "Requires Windows 98 or better",
so I installed Linux.
-----------------------------------------------