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

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Date: Mon, 19 Feb 2024 19:30:48 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: Zi Yan <ziy@...dia.com>, 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 Tue, 20 Feb 2024 11:00:39 +0800 Baolin Wang <baolin.wang@...ux.alibaba.com> wrote:

> > 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

Well I thought I'd fixed everything up 10 minutes ago.  Please take a
look at next mm-unstable.