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From: Yisheng Xie <xieyisheng1-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
To: Christopher Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
	Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>
Cc: 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 19:23:52 +0800	[thread overview]
Message-ID: <a4f1212f-3903-abbc-772a-1ddee6f7f98b@huawei.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1711060926001.9015@nuc-kabylake>

hi Christopher and Vlastimil,

Thanks for your comment!
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?

Thanks
Yisheng Xie
> The cap should not allow migrating pages to nodes that are not allowed by
> the cpuset of the current process.
> 
> 
> 
> .
> 

  reply	other threads:[~2017-11-07 11:23 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 [this message]
     [not found]                     ` <a4f1212f-3903-abbc-772a-1ddee6f7f98b-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2017-11-07 14:54                       ` Christopher Lameter
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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