From: Christopher Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
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>
Subject: Re: [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages
Date: Tue, 7 Nov 2017 08:54:46 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.20.1711070851560.18776@nuc-kabylake> (raw)
In-Reply-To: <a4f1212f-3903-abbc-772a-1ddee6f7f98b-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
On Tue, 7 Nov 2017, Yisheng Xie wrote:
> On 2017/11/6 23:29, Christopher Lameter wrote:
> > On Mon, 6 Nov 2017, Vlastimil Babka wrote:
> >
> >> I'm not sure what exactly is the EPERM intention. Should really the
> >> capability of THIS process override the cpuset restriction of the TARGET
> >> process? Maybe yes. Then, does "insufficient privilege (CAP_SYS_NICE) to
> >
> > CAP_SYS_NICE never overrides cpuset restrictions. The cap can be used to
> > migrate pages that are *also* mapped by other processes (and thus move
> > pages of another process which may have different cpu set restrictions!).
>
> So you means the specified nodes should be a subset of target cpu set, right?
The specified nodes need to be part of the *current* cpu set.
Migrate pages moves the pages of a single process there is no TARGET
process.
Thus thehe *target* nodes need to be a subset of the current cpu set.
next prev parent reply other threads:[~2017-11-07 14:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-27 10:14 [PATCH RFC v2 0/4] some fixes and clean up for mempolicy Yisheng Xie
[not found] ` <1509099265-30868-1-git-send-email-xieyisheng1-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-10-27 10:14 ` [PATCH RFC v2 1/4] mm/mempolicy: Fix get_nodes() mask miscalculation Yisheng Xie
2017-10-31 8:34 ` Vlastimil Babka
[not found] ` <922a4767-9eed-40aa-c437-6f6fcdcab150-AlSwsSmVLrQ@public.gmane.org>
2017-11-01 9:37 ` Yisheng Xie
2017-10-27 10:14 ` [PATCH RFC v2 2/4] mm/mempolicy: remove redundant check in get_nodes Yisheng Xie
2017-10-31 8:55 ` Vlastimil Babka
2017-10-27 10:14 ` [PATCH RFC v2 3/4] mm/mempolicy: fix the check of nodemask from user Yisheng Xie
2017-10-31 9:30 ` Vlastimil Babka
2017-10-31 11:01 ` Yisheng Xie
[not found] ` <65c0e6cb-28b4-f202-1d7f-278b5dfc3440-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-10-31 11:28 ` Vlastimil Babka
2017-10-27 10:14 ` [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages Yisheng Xie
[not found] ` <1509099265-30868-5-git-send-email-xieyisheng1-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-10-31 9:46 ` Vlastimil Babka
[not found] ` <dccbeccc-4155-94a8-0e67-b7c28238896d-AlSwsSmVLrQ@public.gmane.org>
2017-11-06 1:31 ` Yisheng Xie
[not found] ` <bc57f574-92f2-0b69-4717-a1ec7170387c-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-11-06 7:39 ` Vlastimil Babka
[not found] ` <d774ecf6-5e7b-e185-85a0-27bf2bcacfb4-AlSwsSmVLrQ@public.gmane.org>
2017-11-06 15:29 ` Christopher Lameter
2017-11-07 11:23 ` Yisheng Xie
[not found] ` <a4f1212f-3903-abbc-772a-1ddee6f7f98b-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-11-07 14:54 ` Christopher Lameter [this message]
2017-11-07 15:05 ` Vlastimil Babka
2017-11-07 15:55 ` Christopher Lameter
2017-11-08 1:38 ` Yisheng Xie
[not found] ` <4b08f1e9-5449-6ea2-e7da-65fe5f678683-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-11-08 15:02 ` Christopher Lameter
2017-11-09 10:54 ` Yisheng Xie
[not found] ` <9991dd10-8883-7c82-bb4e-8145ea2b7299-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-11-09 15:46 ` Christopher Lameter
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