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Date:   Fri, 3 May 2019 19:52:07 +0000
From:   Pavel Tatashin <>
To:     Dan Williams <>
Cc:, Michal Hocko <>,
        Vlastimil Babka <>,
        Logan Gunthorpe <>,
        Jane Chu <>,,,,
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 <>
> Cc: Vlastimil Babka <>
> Cc: Logan Gunthorpe <>
> Tested-by: Jane Chu <>
> Signed-off-by: Dan Williams <>

Hi Dan,

I have sent comments to the previous version of this patch:

I think they still apply to this one.

Thank you,

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