Re: [Patch v4 1/2] freezer: check OOM kill while being frozen

[Tejun Heo]

On Tue, Sep 09, 2014 at 05:16:55PM +0200, Michal Hocko wrote:
> But OOM killer doesn't kill kernel threads as they do not own any
> memory. So the check should be safe, no?

Even for userland tasks, try_to_freeze() can currently be anywhere in
the kernel.  The frequently used ones are few but there are some odd
ones out, and, again, there's nothing enforcing any structure on
try_to_freeze() usage.  The other thing is that we may do quite a bit
during exiting including allocating memory.  Are those safe for system
PM?  Rafael, what exactly are the rules for PM?  What shouldn't
change?

Thanks.

-- 
tejun
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