From: Wei Yang <richard.weiyang@gmail.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Wei Yang <richard.weiyang@gmail.com>,
Linux-MM <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
Andrea Arcangeli <aarcange@redhat.com>,
Reza Arbab <arbab@linux.vnet.ibm.com>,
Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
Xishi Qiu <qiuxishi@huawei.com>,
Kani Toshimitsu <toshi.kani@hpe.com>,
slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>,
Daniel Kiper <daniel.kiper@oracle.com>,
Igor Mammedov <imammedo@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] mm, memory_hotplug: remove zone restrictions
Date: Fri, 7 Jul 2017 16:37:23 +0800 [thread overview]
Message-ID: <20170707083723.GA19821@WeideMacBook-Pro.local> (raw)
In-Reply-To: <20170706065649.GC29724@dhcp22.suse.cz>
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On Thu, Jul 06, 2017 at 08:56:50AM +0200, Michal Hocko wrote:
>> Below is a result with a little changed kernel to show the start_pfn always.
>> The sequence is:
>> 1. bootup
>>
>> Node 0, zone Movable
>> spanned 65536
>> present 0
>> managed 0
>> start_pfn: 0
>>
>> 2. online movable 2 continuous memory_blocks
>>
>> Node 0, zone Movable
>> spanned 65536
>> present 65536
>> managed 65536
>> start_pfn: 1310720
>>
>> 3. offline 2nd memory_blocks
>>
>> Node 0, zone Movable
>> spanned 65536
>> present 32768
>> managed 32768
>> start_pfn: 1310720
>>
>> 4. offline 1st memory_blocks
>>
>> Node 0, zone Movable
>> spanned 65536
>> present 0
>> managed 0
>> start_pfn: 1310720
>>
>> So I am not sure this is still clearly defined?
>
>Could you be more specific what is not clearly defined? You have
>offlined all online memory blocks so present/managed is 0 while the
>spanned is unchanged because the zone is still defined in range
>[1310720, 1376256].
>
The zone is empty after remove these two memory blocks, while we still think
it is defined in range [1310720, 1376256]. This is what I want to point.
>I also do not see how this is related with the discussed patch as there
>is no zone interleaving involved.
I had a patch which fix the behavior, which means we can make sure the zone is
empty after remove these two memory blocks. As you mentioned in the reply,
http://www.spinics.net/lists/linux-mm/msg130230.html, I thought you would have
this fixed in this cycle. While it looks we will still have this behavior in
this cycle and looks no intend to fix this?
>--
>Michal Hocko
>SUSE Labs
--
Wei Yang
Help you, Help me
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next prev parent reply other threads:[~2017-07-07 8:37 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-29 7:35 [RFC PATCH 0/2] mm, memory_hotplug: remove zone onlining restriction Michal Hocko
2017-06-29 7:35 ` [PATCH 1/2] mm, memory_hotplug: display allowed zones in the preferred ordering Michal Hocko
2017-06-30 0:45 ` Joonsoo Kim
2017-07-07 14:34 ` Vlastimil Babka
2017-06-29 7:35 ` [PATCH 2/2] mm, memory_hotplug: remove zone restrictions Michal Hocko
2017-06-30 1:16 ` Joonsoo Kim
2017-06-30 3:09 ` Wei Yang
2017-06-30 8:39 ` Michal Hocko
2017-06-30 9:39 ` Wei Yang
2017-06-30 9:55 ` Michal Hocko
2017-06-30 11:01 ` Michal Hocko
2017-07-05 23:16 ` Wei Yang
2017-07-06 6:56 ` Michal Hocko
2017-07-07 8:37 ` Wei Yang [this message]
2017-07-07 12:41 ` Michal Hocko
2017-07-07 15:02 ` Vlastimil Babka
2017-07-10 6:45 ` Michal Hocko
2017-07-10 11:11 ` Vlastimil Babka
2017-07-10 11:17 ` Michal Hocko
2017-07-10 12:12 ` Vlastimil Babka
2017-07-10 12:30 ` Michal Hocko
2017-07-12 12:49 ` Michal Hocko
2017-07-14 12:12 [PATCH 0/2] mm, memory_hotplug: remove zone onlining restriction Michal Hocko
2017-07-14 12:12 ` [PATCH 2/2] mm, memory_hotplug: remove zone restrictions Michal Hocko
2017-07-14 12:17 ` Vlastimil Babka
2017-07-14 14:26 ` Reza Arbab
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