On 2/17/21 12:13 AM, Michal Hocko wrote:

On Tue 16-02-21 11:44:34, Mike Kravetz wrote:
[...]

quoted

If we are not going to do the allocations under the lock, then we will need
to either preallocate or take the workqueue approach.

We can still drop the lock temporarily right? As we already do before
calling destroy_compound_gigantic_page...

Yes we can.  I forgot about that.

Actually, very little of what update_and_free_page does needs to be done
under the lock.  Perhaps, just decrementing the global count and clearing
the destructor so PageHuge() is no longer true.
-- 
Mike Kravetz