linux-kernel - Re: [PATCH 1/4] mm, memory_hotplug: cleanup memory offline path

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Message-ID: <20190403084344.GD15605@dhcp22.suse.cz>
Date:   Wed, 3 Apr 2019 10:43:44 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     akpm@...ux-foundation.org, david@...hat.com,
        dan.j.williams@...el.com, Jonathan.Cameron@...wei.com,
        anshuman.khandual@....com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 1/4] mm, memory_hotplug: cleanup memory offline path

On Thu 28-03-19 14:43:17, Oscar Salvador wrote:
> From: Michal Hocko <mhocko@...e.com>
> 
> check_pages_isolated_cb currently accounts the whole pfn range as being
> offlined if test_pages_isolated suceeds on the range. This is based on
> the assumption that all pages in the range are freed which is currently
> the case in most cases but it won't be with later changes, as pages
> marked as vmemmap won't be isolated.
> 
> Move the offlined pages counting to offline_isolated_pages_cb and
> rely on __offline_isolated_pages to return the correct value.
> check_pages_isolated_cb will still do it's primary job and check the pfn
> range.
> 
> While we are at it remove check_pages_isolated and offline_isolated_pages
> and use directly walk_system_ram_range as do in online_pages.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.com>
> Signed-off-by: Oscar Salvador <osalvador@...e.de>

Can we merge this even without the rest of the series? It looks like a
useful thing regardless of this series. Sure we do not really use it
right now but it cleans up the code and actually removes more than it
adds...

-- 
Michal Hocko
SUSE Labs