On Wed, 7 Oct 2015 21:17:59 -0700 Davidlohr Bueso <dave@xxxxxxxxxxxx> wrote:
> This function incurs in very hot paths and merely
> does a few loads for validity check. Lets inline it,
> such that we can save the function call overhead.
>
> ...
>
> --- a/mm/vmacache.c
> +++ b/mm/vmacache.c
> @@ -52,7 +52,7 @@ void vmacache_flush_all(struct mm_struct *mm)
> * Also handle the case where a kernel thread has adopted this mm via use_mm().
> * That kernel thread's vmacache is not applicable to this mm.
> */
> -static bool vmacache_valid_mm(struct mm_struct *mm)
> +static inline bool vmacache_valid_mm(struct mm_struct *mm)
> {
> return current->mm == mm && !(current->flags & PF_KTHREAD);
> }
Yeah, I'll ingest my headgear if there's any vaguely recent compiler
which isn't already inlining this.
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