Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <f93b5d12-d30c-84dd-3ef4-9e21f9f8cf0c@suse.cz>
Date:   Thu, 24 Mar 2022 18:22:54 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.7.0
Subject: Re: [RFC PATCH v1 05/15] mm/slub: move kmalloc_large_node() to
 slab_common.c
Content-Language: en-US
To:     Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org
Cc:     Christoph Lameter <cl@linux.com>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Marco Elver <elver@google.com>,
        Matthew WilCox <willy@infradead.org>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        linux-kernel@vger.kernel.org
References: <20220308114142.1744229-1-42.hyeyoo@gmail.com>
 <20220308114142.1744229-6-42.hyeyoo@gmail.com>
From:   Vlastimil Babka <vbabka@suse.cz>
In-Reply-To: <20220308114142.1744229-6-42.hyeyoo@gmail.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 3/8/22 12:41, Hyeonggon Yoo wrote:
> In later patch SLAB will also pass requests larger than order-1 page
> to page allocator. Move kmalloc_large_node() to slab_common.c.
> 
> Fold kmalloc_large_node_hook() into kmalloc_large_node() as there is
> no other caller.
> 
> Move tracepoint in kmalloc_large_node().
> 
> Add flag fix code. This exist in kmalloc_large() but omitted in
> kmalloc_large_node().
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
> ---
>  include/linux/slab.h |  3 +++
>  mm/slab_common.c     | 26 ++++++++++++++++++++++++
>  mm/slub.c            | 47 ++++----------------------------------------
>  3 files changed, 33 insertions(+), 43 deletions(-)
> 

<snip>

>  
> @@ -4874,15 +4842,8 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
>  	struct kmem_cache *s;
>  	void *ret;
>  
> -	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
> -		ret = kmalloc_large_node(size, gfpflags, node);
> -
> -		trace_kmalloc_node(caller, ret,
> -				   size, PAGE_SIZE << get_order(size),
> -				   gfpflags, node);

Hmm this throws away the caller for tracing, so looks like an unintended
functional change.

> -
> -		return ret;
> -	}
> +	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE))
> +		return kmalloc_large_node(size, gfpflags, node);
>  
>  	s = kmalloc_slab(size, gfpflags);
>