linux-kernel - Re: [PATCH -next] mm/vmacache: inline vmacache_valid

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Message-Id: <20151008151557.0ea74baaafa753b7e86731d0@linux-foundation.org>
Date:	Thu, 8 Oct 2015 15:15:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH -next] mm/vmacache: inline vmacache_valid_mm()

On Wed,  7 Oct 2015 21:17:59 -0700 Davidlohr Bueso <dave@...olabs.net> 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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