[PATCH v2 0/7] arch/mm/fault: accelerate pagefault when badaccess

[Andrew Morton]

On Wed, 3 Apr 2024 16:37:58 +0800 Kefeng Wang <wangkefeng.wang at huawei.com> wrote:

> After VMA lock-based page fault handling enabled, if bad access met
> under per-vma lock, it will fallback to mmap_lock-based handling,
> so it leads to unnessary mmap lock and vma find again. A test from
> lmbench shows 34% improve after this changes on arm64,
> 
>   lat_sig -P 1 prot lat_sig 0.29194 -> 0.19198
> 
> Only build test on other archs except arm64.

Thanks.  So we now want a bunch of architectures to runtime test this.  Do
we have a selftest in place which will adequately do this?