linux-kernel - Re: [PATCH v6 0/4] Enable >0 order folio memory compaction

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Date: Tue, 20 Feb 2024 11:00:39 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: Zi Yan <ziy@...dia.com>, Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 "Huang, Ying" <ying.huang@...el.com>, Ryan Roberts <ryan.roberts@....com>,
 "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 David Hildenbrand <david@...hat.com>, "Yin, Fengwei"
 <fengwei.yin@...el.com>, Yu Zhao <yuzhao@...gle.com>,
 Vlastimil Babka <vbabka@...e.cz>,
 "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
 Johannes Weiner <hannes@...xchg.org>, Kemeng Shi
 <shikemeng@...weicloud.com>, Mel Gorman <mgorman@...hsingularity.net>,
 Rohan Puri <rohan.puri15@...il.com>, Mcgrof Chamberlain <mcgrof@...nel.org>,
 Adam Manzanares <a.manzanares@...sung.com>,
 "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: Re: [PATCH v6 0/4] Enable >0 order folio memory compaction

On 2024/2/20 10:31, Zi Yan wrote:
> On 19 Feb 2024, at 21:06, Andrew Morton wrote:
> 
>> On Fri, 16 Feb 2024 12:04:28 -0500 Zi Yan <zi.yan@...t.com> wrote:
>>
>>> Baolin's patch
>>
>> Baolin writes many patches and patches have names, please use them!
> Sorry for not being specific. I mean this fixup:
> https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?h=mm-everything-2024-02-16-01-35&id=97f749c7c82f677f89bbf4f10de7816ce9b071fe
> 
> to this patch:
> https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?h=mm-everything-2024-02-16-01-35&id=ea87b0558293a5ad597bea606fe261f7b2650cda
> 
> 
> The patch was based on top of my early version of this patchset, thus
> uses "cc->nr_migratepages -= 1 << order;" and
> "cc->nr_migratepages += 1 << order;", but now it is applied before
> mine. The change should be "cc->nr_migratepages--;" and
> "cc->nr_migratepages++;", respectively.
> 
>>
>>> on nr_migratepages was based on this one, a better fixup
>>> for it might be below. Since before my patchset, compaction only deals with
>>> order-0 pages.
>>
>> I don't understand what this means.  The patchset you sent applies OK
>> to mm-unstable so what else is there to do?
> 
> Your above fixup to Baolin's patch needs to be changed to the patch below
> and my "mm/compaction: add support for >0 order folio memory compaction" will
> need to be adjusted accordingly to be applied on top.
> 
> Let me know if anything is unclear.

Hi Andrew,

To avoid conflicts, you can drop these two patches, and I will send a 
new version with fixing the issue pointed by Vlastimilb on top of 
"mm/compaction: add support for >0 order folio memory compaction".

https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?h=mm-everything-2024-02-16-01-35&id=97f749c7c82f677f89bbf4f10de7816ce9b071fe

https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?h=mm-everything-2024-02-16-01-35&id=ea87b0558293a5ad597bea606fe261f7b2650cda