Messages in this thread | | | Date | Tue, 7 Nov 2017 08:54:46 -0600 (CST) | From | Christopher Lameter <> | Subject | Re: [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages |
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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.
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