linux-kernel - Re: [PATCH v7 03/12] mm/sparsemem: Add helpers track active portions of a section at boot

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Message-ID: <20190503195207.l7jrr3z4halukycm@soleen.tm1wkky2jk1uhgkn0ivaxijq1c.bx.internal.cloudapp.net>
Date:   Fri, 3 May 2019 19:52:07 +0000
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     akpm@...ux-foundation.org, Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Logan Gunthorpe <logang@...tatee.com>,
        Jane Chu <jane.chu@...cle.com>, linux-nvdimm@...ts.01.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org, osalvador@...e.de
Subject: Re: [PATCH v7 03/12] mm/sparsemem: Add helpers track active portions
 of a section at boot

On 19-05-01 22:55:37, Dan Williams wrote:
> Prepare for hot{plug,remove} of sub-ranges of a section by tracking a
> section active bitmask, each bit representing 2MB (SECTION_SIZE (128M) /
> map_active bitmask length (64)). If it turns out that 2MB is too large
> of an active tracking granularity it is trivial to increase the size of
> the map_active bitmap.
> 
> The implications of a partially populated section is that pfn_valid()
> needs to go beyond a valid_section() check and read the sub-section
> active ranges from the bitmask.
> 
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Logan Gunthorpe <logang@...tatee.com>
> Tested-by: Jane Chu <jane.chu@...cle.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Hi Dan,

I have sent comments to the previous version of this patch:
https://lore.kernel.org/lkml/CA+CK2bAfnCVYz956jPTNQ+AqHJs7uY1ZqWfL8fSUFWQOdKxHcg@mail.gmail.com/

I think they still apply to this one.

Thank you,
Pasha