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

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Message-ID: <9991dd10-8883-7c82-bb4e-8145ea2b7299@huawei.com>
Date:   Thu, 9 Nov 2017 18:54:57 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     Christopher Lameter <cl@...ux.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

Hi Christopher,

On 2017/11/8 23:02, Christopher Lameter wrote:
> On Wed, 8 Nov 2017, Yisheng Xie wrote:
> 
>> Another case is current process is *not* the same as target process, and
>> when current process try to migrate pages of target process from old_nodes
>> to new_nodes, the new_nodes should be a subset of target process cpuset.
> 
> 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 :)

Thanks
Yisheng Xie
> 
> .
>