From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christopher Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in
 SYSC_migrate_pages
Date: Thu, 9 Nov 2017 09:46:42 -0600 (CST)
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To: Yisheng Xie <xieyisheng1-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, mhocko-IBi9RG/b67k@public.gmane.org, mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, n-horiguchi-PaJj6Psr51x8UrSeD/g0lQ@public.gmane.org, salls-b3bnyZ7c9ISVc3sceRu5cw@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, tanxiaojun-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
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On Thu, 9 Nov 2017, Yisheng Xie wrote:

> > 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 :)

Exactly.