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From: Michal Hocko <mhocko@kernel.org>
To: Wei Yang <richard.weiyang@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Linux-MM <linux-mm@kvack.org>, Mel Gorman <mgorman@suse.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Reza Arbab <arbab@linux.vnet.ibm.com>,
	Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
	qiuxishi@huawei.com, Kani Toshimitsu <toshi.kani@hpe.com>,
	slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>,
	Andi Kleen <ak@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	Igor Mammedov <imammedo@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Balbir Singh <bsingharora@gmail.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Tobias Regnery <tobias.regnery@gmail.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Subject: Re: [PATCH -v4 0/14] mm: make movable onlining suck less
Date: Fri, 9 Jun 2017 12:49:47 +0200	[thread overview]
Message-ID: <20170609104947.GD21764@dhcp22.suse.cz> (raw)
In-Reply-To: <CADZGycZvW1pTxt_NifTVmO3u_4694=JHe3k8xbESmhu4aonF-w@mail.gmail.com>

On Fri 09-06-17 17:51:24, Wei Yang wrote:
> Hi, Michal
> 
> I am not that familiar with hotplug and trying to catch up the issue
>  and your solution.
> 
> One potential issue I found is we don't check the physical boundary
> when add_memory_resource().
> 
> For example, on x86-64, only 64T physical memory is supported currently.
> Looks it is expanded after 5-level pagetable is introduced. While there is
> still some limitations on this. But we don't check the boundary I think.
> 
> During the bootup, this is ensured by the max_pfn which is guaranteed to
> be under MAX_ARCH_PFN. I don't see some limitation on this when doing
>  hotplug.

This might be true and I would have to double check but this rework
doesn't change anything in that regards. Or do I miss something?
-- 
Michal Hocko
SUSE Labs

WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: Wei Yang <richard.weiyang@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Linux-MM <linux-mm@kvack.org>, Mel Gorman <mgorman@suse.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Reza Arbab <arbab@linux.vnet.ibm.com>,
	Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
	qiuxishi@huawei.com, Kani Toshimitsu <toshi.kani@hpe.com>,
	slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>,
	Andi Kleen <ak@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	Igor Mammedov <imammedo@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Balbir Singh <bsingharora@gmail.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Tobias Regnery <tobias.regnery@gmail.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Subject: Re: [PATCH -v4 0/14] mm: make movable onlining suck less
Date: Fri, 9 Jun 2017 12:49:47 +0200	[thread overview]
Message-ID: <20170609104947.GD21764@dhcp22.suse.cz> (raw)
In-Reply-To: <CADZGycZvW1pTxt_NifTVmO3u_4694=JHe3k8xbESmhu4aonF-w@mail.gmail.com>

On Fri 09-06-17 17:51:24, Wei Yang wrote:
> Hi, Michal
> 
> I am not that familiar with hotplug and trying to catch up the issue
>  and your solution.
> 
> One potential issue I found is we don't check the physical boundary
> when add_memory_resource().
> 
> For example, on x86-64, only 64T physical memory is supported currently.
> Looks it is expanded after 5-level pagetable is introduced. While there is
> still some limitations on this. But we don't check the boundary I think.
> 
> During the bootup, this is ensured by the max_pfn which is guaranteed to
> be under MAX_ARCH_PFN. I don't see some limitation on this when doing
>  hotplug.

This might be true and I would have to double check but this rework
doesn't change anything in that regards. Or do I miss something?
-- 
Michal Hocko
SUSE Labs

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  reply	other threads:[~2017-06-09 10:50 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-15  8:58 [PATCH -v4 0/14] mm: make movable onlining suck less Michal Hocko
2017-05-15  8:58 ` Michal Hocko
2017-05-15  8:58 ` [PATCH 01/14] mm: remove return value from init_currently_empty_zone Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 02/14] mm, memory_hotplug: use node instead of zone in can_online_high_movable Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 03/14] mm: drop page_initialized check from get_nid_for_pfn Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 04/14] mm, memory_hotplug: get rid of is_zone_device_section Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-06-10  9:56   ` Wei Yang
2017-06-10  9:56     ` Wei Yang
2017-06-10 14:58     ` Wei Yang
2017-06-10 14:58       ` Wei Yang
2017-06-12  6:49       ` Michal Hocko
2017-06-12  6:49         ` Michal Hocko
2017-06-14  6:17         ` Wei Yang
2017-06-14  6:12     ` Wei Yang
2017-06-14  6:32       ` Michal Hocko
2017-06-14  6:32         ` Michal Hocko
2017-06-14  9:12         ` Wei Yang
2017-06-14  9:24           ` Michal Hocko
2017-06-14  9:24             ` Michal Hocko
2017-06-15  1:02             ` Wei Yang
2017-05-15  8:58 ` [PATCH 05/14] mm, memory_hotplug: split up register_one_node Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 06/14] mm, memory_hotplug: consider offline memblocks removable Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 07/14] mm: consider zone which is not fully populated to have holes Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-18 16:14   ` Vlastimil Babka
2017-05-18 16:14     ` Vlastimil Babka
2017-05-18 16:42     ` Michal Hocko
2017-05-18 16:42       ` Michal Hocko
2017-05-19  7:21       ` Vlastimil Babka
2017-05-19  7:21         ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 08/14] mm, compaction: skip over holes in __reset_isolation_suitable Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  7:23   ` Vlastimil Babka
2017-05-19  7:23     ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 09/14] mm: __first_valid_page skip over offline pages Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  8:05   ` Vlastimil Babka
2017-05-19  8:05     ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 10/14] mm, vmstat: skip reporting offline pages in pagetypeinfo Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  8:17   ` Vlastimil Babka
2017-05-19  8:17     ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 11/14] mm, memory_hotplug: do not associate hotadded memory to zones until online Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  8:56   ` Vlastimil Babka
2017-05-19  8:56     ` Vlastimil Babka
2017-06-16  4:20   ` Wei Yang
2017-06-16  8:05     ` Michal Hocko
2017-06-16  8:05       ` Michal Hocko
2017-06-16  8:11   ` Wei Yang
2017-06-16  8:45     ` Michal Hocko
2017-06-16  8:45       ` Michal Hocko
2017-06-16  9:11       ` Wei Yang
2017-06-25  0:14   ` Wei Yang
2017-06-26  5:38     ` Michal Hocko
2017-06-26  5:38       ` Michal Hocko
2017-05-15  8:58 ` [PATCH 12/14] mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 13/14] mm, memory_hotplug: fix the section mismatch warning Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 14/14] mm, memory_hotplug: remove unused cruft after memory hotplug rework Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-06-09  9:51 ` [PATCH -v4 0/14] mm: make movable onlining suck less Wei Yang
2017-06-09  9:51   ` Wei Yang
2017-06-09 10:49   ` Michal Hocko [this message]
2017-06-09 10:49     ` Michal Hocko
2017-06-10  2:20     ` Wei Yang
2017-06-10  2:20       ` Wei Yang

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