linux-kernel - Re: [PATCH] mm, sparse: fix typo in online_mem

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Message-ID: <20170905072836.i4dxrukevojty4ub@dhcp22.suse.cz>
Date:   Tue, 5 Sep 2017 09:28:36 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm, sparse: fix typo in online_mem_sections

On Tue 05-09-17 12:32:28, Anshuman Khandual wrote:
> On 09/04/2017 04:52 PM, Michal Hocko wrote:
> > From: Michal Hocko <mhocko@...e.com>
> > 
> > online_mem_sections accidentally marks online only the first section in
> > the given range. This is a typo which hasn't been noticed because I
> > haven't tested large 2GB blocks previously. All users of
> 
> Section sizes are normally less than 2GB. Could you please elaborate
> why this never got noticed before ?

Section size is 128MB which is the default block size as well. So we
have one section per block. But if the amount of memory is very large
(64GB - see probe_memory_block_size) then we have a 2GB memory blocks
so multiple sections per block.
-- 
Michal Hocko
SUSE Labs