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SubjectRe: [PATCH 4/4] Swap migration V3: sys_migrate_pages interface


> Christoph Lameter wrote:
>
>>> > + /* Is the user allowed to access the target nodes? */
>>> > + if (!nodes_subset(new, cpuset_mems_allowed(task)))
>>> > + return -EPERM;
>>> > +
>
>> How about this ?
>> +cpuset_update_task_mems_allowed(task, new); (this isn't implemented now

*new* is already guaranteed to be the subset of current mem_allowed.
Is this violate the permission ?

Simon Derr wrote:
> Automatically updating the ->mems_allowed field as you suggest would
> require that the kernel do the same checks in sys_migrage_pages(). Sounds
> not as a very good idea to me.

Hmm, it means a user or admin should modify mem_allowed
before the first page fault after calling sys_migrate_pages().

-- Kame


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