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SubjectRe: [PATCH 4/4] Swap migration V3: sys_migrate_pages interface
Christoph wrote:
> Therefore if mems_allowed is accessed from outside of the
> task then it may not be up to date, right?

Yup - exactly.

The up to date allowed memory container for a task is in its cpuset,
which does have the locking mechanisms needed for safe access from
other tasks.

The task mems_allowed is just a private cache of the mems_allowed of
its cpuset, used for quick access from within the task context by the
page allocation code.

I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <> 1.925.600.0401
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