linux-kernel - Re: [PATCH] mm,swap: cleanup VMA based swap readahead window calculation

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Date: Thu, 25 Apr 2024 09:45:53 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: David Hildenbrand <david@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,  linux-mm@...ck.org,
  linux-kernel@...r.kernel.org,  Hugh Dickins <hughd@...gle.com>,  Alistair
 Popple <apopple@...dia.com>,  Anshuman Khandual
 <anshuman.khandual@....com>,  Mel Gorman <mgorman@...hsingularity.net>,
  Miaohe Lin <linmiaohe@...wei.com>,  Minchan Kim <minchan@...nel.org>,
  Ryan Roberts <ryan.roberts@....com>,  Yang Shi <shy828301@...il.com>,  Yu
 Zhao <yuzhao@...gle.com>,  Kairui Song <kasong@...cent.com>,  Barry Song
 <v-songbaohua@...o.com>,  Chris Li <chrisl@...nel.org>,  Yosry Ahmed
 <yosryahmed@...gle.com>
Subject: Re: [PATCH] mm,swap: cleanup VMA based swap readahead window
 calculation

David Hildenbrand <david@...hat.com> writes:

> On 24.04.24 08:30, Huang Ying wrote:
>> When VMA based swap readahead is introduced in commit
>> ec560175c0b6 ("mm, swap: VMA based swap readahead"), "struct
>> vma_swap_readahead" is defined to describe the readahead window.
>> Because we wanted to save the PTE entries in the struct at that time.
>> But after commit 4f8fcf4ced0b ("mm/swap: swap_vma_readahead() do the
>> pte_offset_map()"), we no longer save PTE entries in the struct.  The
>> size of the struct becomes so small, that it's better to use the
>> fields of the struct directly.  This can simplify the code to improve
>> the code readability.  The line number of source code reduces too.
>> No functionality change is expected in this patch.
>
> From a quick scan, you perform quite some unrelated changes that make
> the code harder to review than it should be. Consider separating any
> cleanups from the core change of removing the struct.

Sure.  Will separate it.

--
Best Regards,
Huang, Ying