linux-kernel - Re: [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in SYSC_migrate

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Date:   Thu, 9 Nov 2017 09:46:42 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Yisheng Xie <xieyisheng1@...wei.com>
cc:     Vlastimil Babka <vbabka@...e.cz>, akpm@...ux-foundation.org,
        mhocko@...e.com, mingo@...nel.org, rientjes@...gle.com,
        n-horiguchi@...jp.nec.com, salls@...ucsb.edu, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, tanxiaojun@...wei.com,
        linux-api@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in
 SYSC_migrate_pages

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.