linux-kernel - Re: [PATCH mm-new v6 2/5] mm: khugepaged: refine scan progress number

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Message-ID: <15ddd3fb-abff-4a95-9670-06622bd90e1d@arm.com>
Date: Fri, 6 Feb 2026 15:30:49 +0530
From: Dev Jain <dev.jain@....com>
To: "David Hildenbrand (Arm)" <david@...nel.org>,
 Vernon Yang <vernon2gm@...il.com>
Cc: akpm@...ux-foundation.org, lorenzo.stoakes@...cle.com, ziy@...dia.com,
 baohua@...nel.org, lance.yang@...ux.dev, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Vernon Yang <yanglincheng@...inos.cn>
Subject: Re: [PATCH mm-new v6 2/5] mm: khugepaged: refine scan progress number


On 06/02/26 2:32 pm, David Hildenbrand (Arm) wrote:
> On 2/5/26 15:25, Dev Jain wrote:
>>
>> On 05/02/26 5:41 pm, David Hildenbrand (arm) wrote:
>>> On 2/5/26 07:08, Vernon Yang wrote:
>>>> On Thu, Feb 5, 2026 at 5:35 AM David Hildenbrand (arm)
>>>> <david@...nel.org> wrote:
>>>>
>>>> I guess, your meaning is "min(_pte - pte + 1, HPAGE_PMD_NR)", not max().
>>>
>>> Yes!
>>>
>>>>
>>>>
>>>> I'm also worried that the compiler can't optimize this since the body of
>>>> the loop is complex, as with Dev's opinion [1].
>>>
>>> Why do we even have to optimize this? :)
>>>
>>> Premature ... ? :)
>>
>>
>> I mean .... we don't, but the alternate is a one liner using max().
>
> I'm fine with the max(), but it still seems like adding complexity to
> optimize something that is nowhere prove to really be a problem. 

Agreed. Vernon, let us do the increment in the loop then.