linux-kernel - Re: [PATCH v3 1/3] mm, slub: use pGp to print page flags

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Date:   Tue, 9 Feb 2021 09:04:35 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Yafang Shao <laoar.shao@...il.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <andriy.shevchenko@...ux.intel.com>, <david@...hat.com>,
        <vbabka@...e.cz>, <willy@...radead.org>, <cl@...ux.com>,
        <penberg@...nel.org>, <rientjes@...gle.com>,
        <iamjoonsoo.kim@....com>, <akpm@...ux-foundation.org>,
        <pmladek@...e.com>, <rostedt@...dmis.org>,
        <sergey.senozhatsky@...il.com>, <joe@...ches.com>
Subject: Re: [PATCH v3 1/3] mm, slub: use pGp to print page flags

On 2021/2/8 18:14, Yafang Shao wrote:
> As pGp has been already introduced in printk, we'd better use it to make
> the output human readable.
> 
> Before this change, the output is,
> [ 6155.716018] INFO: Slab 0x000000004027dd4f objects=33 used=3 fp=0x000000008cd1579c flags=0x17ffffc0010200
> 
> While after this change, the output is,
> [ 8846.517809] INFO: Slab 0x00000000f42a2c60 objects=33 used=3 fp=0x0000000060d32ca8 flags=0x17ffffc0010200(slab|head)
> 
> Reviewed-by: David Hildenbrand <david@...hat.com>
> Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
> Acked-by: David Rientjes <rientjes@...gle.com>
> Acked-by: Christoph Lameter <cl@...ux.com>
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>

LGTM. Thanks.
Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>

> ---
>  mm/slub.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 34dcc09e2ec9..87ff086e68a4 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -638,8 +638,9 @@ void print_tracking(struct kmem_cache *s, void *object)
>  
>  static void print_page_info(struct page *page)
>  {
> -	pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n",
> -	       page, page->objects, page->inuse, page->freelist, page->flags);
> +	pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=%#lx(%pGp)\n",
> +	       page, page->objects, page->inuse, page->freelist,
> +	       page->flags, &page->flags);
>  
>  }
>  
>