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From: Yisheng Xie <xieyisheng1@huawei.com>
To: Christopher Lameter <cl@linux.com>
Cc: Vlastimil Babka <vbabka@suse.cz>,
	akpm@linux-foundation.org, mhocko@suse.com, mingo@kernel.org,
	rientjes@google.com, n-horiguchi@ah.jp.nec.com,
	salls@cs.ucsb.edu, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, tanxiaojun@huawei.com,
	linux-api@vger.kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH RFC v2 4/4] mm/mempolicy: add nodes_empty check in SYSC_migrate_pages
Date: Thu, 9 Nov 2017 18:54:57 +0800	[thread overview]
Message-ID: <9991dd10-8883-7c82-bb4e-8145ea2b7299@huawei.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1711080900050.6161@nuc-kabylake>

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
> 
> .
> 

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  reply	other threads:[~2017-11-09 10:59 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
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
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
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
2017-10-31  9:46   ` Vlastimil Babka
2017-11-06  1:31     ` Yisheng Xie
2017-11-06  7:39       ` Vlastimil Babka
2017-11-06 15:29         ` Christopher Lameter
2017-11-07 11:23           ` Yisheng Xie
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
2017-11-08 15:02                     ` Christopher Lameter
2017-11-09 10:54                       ` Yisheng Xie [this message]
2017-11-09 15:46                         ` Christopher Lameter

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