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From: Michal Hocko <mhocko@kernel.org>
To: Oscar Salvador <osalvador@suse.de>
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, Oscar Salvador <osalvador@suse.com>
Subject: Re: [PATCH v2 5/5] mm, memory_hotplug: Refactor shrink_zone/pgdat_span
Date: Wed, 28 Nov 2018 07:50:18 +0100
Message-ID: <20181128065018.GG6923@dhcp22.suse.cz> (raw)
In-Reply-To: <20181127162005.15833-6-osalvador@suse.de>

On Tue 27-11-18 17:20:05, Oscar Salvador wrote:
> From: Oscar Salvador <osalvador@suse.com>
> 
> shrink_zone_span and shrink_pgdat_span look a bit weird.
> 
> They both have a loop at the end to check if the zone
> or pgdat contains only holes in case the section to be removed
> was not either the first one or the last one.
> 
> Both code loops look quite similar, so we can simplify it a bit.
> We do that by creating a function (has_only_holes), that basically
> calls find_smallest_section_pfn() with the full range.
> In case nothing has to be found, we do not have any more sections
> there.
> 
> To be honest, I am not really sure we even need to go through this
> check in case we are removing a middle section, because from what I can see,
> we will always have a first/last section.
> 
> Taking the chance, we could also simplify both find_smallest_section_pfn()
> and find_biggest_section_pfn() functions and move the common code
> to a helper.

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.

-- 
Michal Hocko
SUSE Labs

  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 [this message]
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
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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