Re: [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages

[Yisheng Xie]

Hi Christopher,

On 2017/11/8 23:02, Christopher Lameter wrote:
> On Wed, 8 Nov 2017, Yisheng Xie wrote:
> 
>> Another case is current process is *not* the same as target process, and
>> when current process try to migrate pages of target process from old_nodes
>> to new_nodes, the new_nodes should be a subset of target process cpuset.
> 
> The caller of migrate_pages should be able to migrate the target process
> pages anywhere the caller can allocate memory. If that is outside the
> target processes cpuset then that is fine. Pagecache pages that are not
> allocated by the target process already are not subject to the target
> processes restriction. So this is not that unusual.

So there is no need to check the restriction of target process cpuset, right?
I hope that I do not miss anything :)

Thanks
Yisheng Xie
> 
> .
>