linux-kernel - Re: [PATCH] mm/slub: fix missing ALLOC

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Message-ID: <alpine.DEB.2.23.453.2008111435300.3428139@chino.kir.corp.google.com>
Date:   Tue, 11 Aug 2020 14:40:14 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Abel Wu <wuyun.wu@...wei.com>
cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        hewenliang4@...wei.com, hushiyuan@...wei.com,
        "open list:SLAB ALLOCATOR" <linux-mm@...ck.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/slub: fix missing ALLOC_SLOWPATH stat when bulk
 alloc

On Tue, 11 Aug 2020, wuyun.wu@...wei.com wrote:

> From: Abel Wu <wuyun.wu@...wei.com>
> 
> The ALLOC_SLOWPATH statistics is missing in bulk allocation now.
> Fix it by doing statistics in alloc slow path.
> 
> Signed-off-by: Abel Wu <wuyun.wu@...wei.com>
> ---
>  mm/slub.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index df93a5a0e9a4..5d89e4064f83 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2600,6 +2600,8 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
>  	void *freelist;
>  	struct page *page;
>  
> +	stat(s, ALLOC_SLOWPATH);
> +
>  	page = c->page;
>  	if (!page) {
>  		/*
> @@ -2788,7 +2790,6 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
>  	page = c->page;
>  	if (unlikely(!object || !node_match(page, node))) {
>  		object = __slab_alloc(s, gfpflags, node, addr, c);
> -		stat(s, ALLOC_SLOWPATH);
>  	} else {
>  		void *next_object = get_freepointer_safe(s, object);
>  

Acked-by: David Rientjes <rientjes@...gle.com>

> -- 
> 2.28.0.windows.1

Lol :)