On Wednesday, 31 March 2021 9:09:30 AM AEDT Alistair Popple wrote:

On Wednesday, 31 March 2021 5:49:03 AM AEDT Jason Gunthorpe wrote:

quoted

On Fri, Mar 26, 2021 at 11:08:00AM +1100, Alistair Popple wrote:

<snip>

quoted

So what clears PG_mlocked on this call path?

See munlock_vma_page(). munlock works by clearing PG_mlocked, then calling 
try_to_munlock to check if any VMAs still need it locked in which case 
PG_mlocked gets set again. There are no other callers of try_to_munlock().

quoted

Something needs attention here..

I think the code is correct, but perhaps the naming could be better. Would be 
interested hearing any thoughts on renaming try_to_munlock() to try_to_mlock() 
as the current name appears based on the context it is called from (munlock) 
rather than what it does (mlock).

Actually Documentation/vm/unevictable-lru.rst contains a better suggestion:

try_to_munlock() Reverse Map Scan
---------------------------------

.. warning::
   [!] TODO/FIXME: a better name might be page_mlocked() - analogous to the
   page_referenced() reverse map walker.

Thoughts on renaming try_to_unlock() -> page_mlocked() and try_to_munlock_one() -> page_mlock_one()?

 - Alistair

quoted

Jason

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