linux-kernel - Re: [PATCH v2 07/10] mm/memory_hotplug: simplify page onlining

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Date:   Mon, 24 Aug 2020 12:55:59 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Baoquan He <bhe@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>
Subject: Re: [PATCH v2 07/10] mm/memory_hotplug: simplify page onlining

On Wed, Aug 19, 2020 at 07:59:54PM +0200, David Hildenbrand wrote:
> We don't allow to offline memory with holes, all boot memory is online,
> and all hotplugged memory cannot have holes.
> 
> We can now simplify onlining of pages. As we only allow to online/offline
> full sections and sections always span full MAX_ORDER_NR_PAGES, we can just
> process MAX_ORDER - 1 pages without further special handling.
> 
> The number of onlined pages simply corresponds to the number of pages we
> were requested to online.
> 
> While at it, refine the comment regarding the callback not exposing all
> pages to the buddy.
> 
> Acked-by: Michal Hocko <mhocko@...e.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Cc: Baoquan He <bhe@...hat.com>
> Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

-- 
Oscar Salvador
SUSE L3