linux-kernel - Re: [PATCH v2 02/10] mm/memory_hotplug: enforce section granularity when onlining/offlining

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Message-ID: <20200825021129.GA78808@L-31X9LVDL-1304.local>
Date:   Tue, 25 Aug 2020 10:11:29 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     David Hildenbrand <david@...hat.com>, 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 02/10] mm/memory_hotplug: enforce section granularity
 when onlining/offlining

On Mon, Aug 24, 2020 at 12:39:18PM +0200, Oscar Salvador wrote:
>On Wed, Aug 19, 2020 at 07:59:49PM +0200, David Hildenbrand wrote:
>> Already two people (including me) tried to offline subsections, because
>> the function looks like it can deal with it. But we really can only
>> online/offline full sections that are properly aligned (e.g., we can only
>> mark full sections online/offline via SECTION_IS_ONLINE).
>> 
>> Add a simple safety net to document the restriction now. Current users
>> (core and powernv/memtrace) respect these restrictions.
>
>It's been a while since I looked at sub-section handling stuff so sorry to ask
>this, but was it true that we can hot-{remove,add} sub-section granularity, while
>we can only online /offline on section granularity?
>

Seems you are right.

>> 
>> 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

-- 
Wei Yang
Help you, Help me