Re: [PATCH 2/2] mm, rmap: handle anon_vma_fork() NULL check inline

[Jinjie Ruan]

On 2024/12/9 21:35, Matthew Wilcox wrote:
> On Mon, Dec 09, 2024 at 09:25:49PM +0800, Jinjie Ruan wrote:
>> Check the anon_vma of pvma inline so we can avoid the function call
>> overhead if the anon_vma is NULL.
> 
> This really gets you 1% perf improvement?  On what hardware?

Yes，the total improvement of this two patches is about 1% on our
last-generation arm64 server platform.

During the test of Unixbench single-core process creation, the trace
result shows that the two functions are frequently invoked, and a large
number of check NULL and returned.

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