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

David Hildenbrand
2025-05-08T08:43:59Z

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.

--
Cheers,

David / dhildenb