linux-kernel - Re: [PATCH v4 0/3] sparse

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Date:   Tue, 10 Jul 2018 07:56:04 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Pavel Tatashin <pasha.tatashin@...cle.com>,
        steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        linux-kernel@...r.kernel.org, kirill.shutemov@...ux.intel.com,
        mhocko@...e.com, linux-mm@...ck.org, dan.j.williams@...el.com,
        jack@...e.cz, jglisse@...hat.com, jrdr.linux@...il.com,
        gregkh@...uxfoundation.org, vbabka@...e.cz,
        richard.weiyang@...il.com, dave.hansen@...el.com,
        rientjes@...gle.com, mingo@...nel.org, osalvador@...hadventures.net
Subject: Re: [PATCH v4 0/3] sparse_init rewrite

Hi Andrew,

On 07/09/18 at 02:29pm, Andrew Morton wrote:
> On Mon,  9 Jul 2018 13:53:09 -0400 Pavel Tatashin <pasha.tatashin@...cle.com> wrote:
> > For the ease of review, I split this work so the first patch only adds new
> > interfaces, the second patch enables them, and removes the old ones.
> 
> This clashes pretty significantly with patches from Baoquan and Oscar:
> 
> mm-sparse-make-sparse_init_one_section-void-and-remove-check.patch
> mm-sparse-make-sparse_init_one_section-void-and-remove-check-fix.patch
> mm-sparse-make-sparse_init_one_section-void-and-remove-check-fix-2.patch
> mm-sparse-add-a-static-variable-nr_present_sections.patch
> mm-sparsemem-defer-the-ms-section_mem_map-clearing.patch
> mm-sparse-add-a-new-parameter-data_unit_size-for-alloc_usemap_and_memmap.patch

> Is there duplication of intent here?  Any thoughts on the
> prioritization of these efforts?

The final version of my patches was posted here:
http://lkml.kernel.org/r/20180628062857.29658-1-bhe@redhat.com

Currently, only the first three patches are merged. 

mm-sparse-add-a-static-variable-nr_present_sections.patch
mm-sparsemem-defer-the-ms-section_mem_map-clearing.patch
mm-sparse-add-a-new-parameter-data_unit_size-for-alloc_usemap_and_memmap.patch

They are preparation patches, and the 4th patch is the formal fix patch:
[PATCH v6 4/5] mm/sparse: Optimize memmap allocation during sparse_init()

The 5th patch is a clean up patch according to reviewer's suggestion:
[PATCH v6 5/5] mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER

I think Pavel's patches sits on top of all above five patches.

Thanks
Baoquan