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From: osalvador@suse.de
To: 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, david@redhat.com,
	linux-mm@kvack.org, owner-linux-mm@kvack.org
Subject: Re: [PATCH v2 5/5] mm, memory_hotplug: Refactor shrink_zone/pgdat_span
Date: Wed, 28 Nov 2018 13:51:42 +0100
Message-ID: <ddd7474af7162dcfa3ce328587b4a916@suse.de> (raw)
In-Reply-To: <20181128123120.GJ6923@dhcp22.suse.cz>

> yep. Or when we extend a zone/node via hotplug.
> 
>> The only thing I am worried about is that by doing that, the system
>> will account spanned_pages incorrectly.
> 
> As long as end_pfn - start_pfn matches then I do not see what would be
> incorrect.

If by end_pfn - start_pfn you mean zone_end_pfn - zone_start_pfn,
then we would still need to change zone_start_pfn when removing
the first section, and adjust spanned_pages in case we remove the last 
section,
would not we?

Let us say we have a zone with 3 sections:

zone_start_pfn = 0
zone_end_pfn = 98304

If we hot-remove the last section, zone_end_pfn should be adjusted to 
65536.
Otherwise zone_end_pfn - zone_start_pfn will give us more.

The same goes when we hot-remove the first section.
Of course, we should not care when removing a section which is not 
either
the first one or the last one.

Having said that, I will check the uses we have for spanned_pages.

  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
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 [this message]
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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