Re:Re: [PATCH v4] arm64/mm: Optimize loop to reduce redundant operations of contpte_ptep_get

Xavier
2025-05-09T10:04:55Z

At 2025-05-08 16:30:14, "David Hildenbrand" <david@redhat.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