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From: David Hildenbrand <david@redhat.com>
To: Oscar Salvador <osalvador@suse.de>, Michal Hocko <mhocko@kernel.org>
Cc: akpm@linux-foundation.org, dan.j.williams@intel.com,
	pavel.tatashin@microsoft.com, jglisse@redhat.com,
	Jonathan.Cameron@huawei.com, rafael@kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH v2 5/5] mm, memory_hotplug: Refactor shrink_zone/pgdat_span
Date: Wed, 28 Nov 2018 11:03:08 +0100
Message-ID: <e9166b74-58ce-3896-e170-52e4aa852024@redhat.com> (raw)
In-Reply-To: <1543388866.2920.5.camel@suse.de>

On 28.11.18 08:07, Oscar Salvador wrote:
> On Wed, 2018-11-28 at 07:50 +0100, Michal Hocko wrote:
>>
>> I didn't get to read through this whole series but one thing that is
>> on
>> my todo list for a long time is to remove all this stuff. I do not
>> think
>> we really want to simplify it when there shouldn't be any real reason
>> to
>> have it around at all. Why do we need to shrink zone/node at all?
>>
>> Now that we can override and assign memory to both normal na movable
>> zones I think we should be good to remove shrinking.
> 
> I feel like I am missing a piece of obvious information here.
> Right now, we shrink zone/node to decrease spanned pages.
> I thought this was done for consistency, and in case of the node, in
> try_offline_node we use the spanned pages to go through all sections
> to check whether the node can be removed or not.
> 

I am also not sure if that can be done. Anyhow, simplifying first and
getting rid later is in my opinion also good enough. One step at a time :)

> From your comment, I understand that we do not really care about
> spanned pages. Why?
> Could you please expand on that?
> 
> And if we remove it, would not this give to a user "bad"/confusing
> information when looking at /proc/zoneinfo?
> 
> 
> Thanks
> 


-- 

Thanks,

David / dhildenb

  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-27 16:20 [PATCH v2 0/5] Do not touch pages in hot-remove path Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 1/5] mm, memory_hotplug: Add nid parameter to arch_remove_memory Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 2/5] kernel, resource: Check for IORESOURCE_SYSRAM in release_mem_region_adjustable Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 3/5] mm, memory_hotplug: Move zone/pages handling to offline stage Oscar Salvador
2018-11-28  7:52   ` Mike Rapoport
2018-11-28 14:25     ` osalvador
2018-11-28 14:15   ` osalvador
2018-11-27 16:20 ` [PATCH v2 4/5] mm, memory-hotplug: Rework unregister_mem_sect_under_nodes Oscar Salvador
2019-03-24  6:48   ` Anshuman Khandual
2019-03-25  7:40     ` Oscar Salvador
2019-03-25  8:04       ` Michal Hocko
2019-03-25  8:14         ` Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 5/5] mm, memory_hotplug: Refactor shrink_zone/pgdat_span Oscar Salvador
2018-11-28  6:50   ` Michal Hocko
2018-11-28  7:07     ` Oscar Salvador
2018-11-28 10:03       ` David Hildenbrand [this message]
2018-11-28 10:14       ` Michal Hocko
2018-11-28 11:00         ` osalvador
2018-11-28 12:31           ` Michal Hocko
2018-11-28 12:51             ` osalvador
2018-11-28 13:08               ` Michal Hocko
2018-11-28 13:18                 ` osalvador
2018-11-28 15:50                   ` Michal Hocko
2018-11-28 16:02                     ` osalvador
2018-11-29  9:29                     ` osalvador
2018-11-28 13:09               ` osalvador

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