linux-kernel - Re:Re: [PATCH v4] arm64/mm: Optimize loop to reduce redundant operations of contpte_ptep

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Message-ID: <29f1ebb9.8e60.196b45626fb.Coremail.xavier_qy@163.com>
Date: Fri, 9 May 2025 17:17:47 +0800 (CST)
From: Xavier  <xavier_qy@....com>
To: "David Hildenbrand" <david@...hat.com>
Cc: 21cnbao@...il.com, ryan.roberts@....com, dev.jain@....com,
	ioworker0@...il.com, akpm@...ux-foundation.org,
	catalin.marinas@....com, gshan@...hat.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	will@...nel.org, willy@...radead.org, ziy@...dia.com
Subject: Re:Re: [PATCH v4] arm64/mm: Optimize loop to reduce redundant
 operations of contpte_ptep_get




At 2025-05-08 16:30:14, "David Hildenbrand" <david@...hat.com> wrote:
>On 08.05.25 09:03, Xavier Xia wrote:
>> This commit optimizes the contpte_ptep_get and contpte_ptep_get_lockless
>> function by adding early termination logic. It checks if the dirty and
>> young bits of orig_pte are already set and skips redundant bit-setting
>> operations during the loop. This reduces unnecessary iterations and
>> improves performance.
>> 
>> In order to verify the optimization performance, a test function has been
>> designed. The function's execution time and instruction statistics have
>> been traced using perf, and the following are the operation results on a
>> certain Qualcomm mobile phone chip:
>
>For the future, please don't post vN+1 as reply to vN.

I will pay attention to it when I submit it later. Thank you for the reminder.

>
>-- 
>Cheers,
>
>David / dhildenb

--
Thanks,
Xavier