linux-kernel - Re: [PATCH] mm/softoffline: Add page flag description in error paths

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Date:   Mon, 10 Apr 2017 00:15:23 +0000
From:   Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm/softoffline: Add page flag description in error paths

On Sun, Apr 09, 2017 at 08:08:29AM +0530, Anshuman Khandual wrote:
> It helps to provide page flag description along with the raw value in
> error paths during soft offline process. From sample experiments
> 
> Before the patch:
> 
> [  132.317977] soft offline: 0x6100: migration failed 1, type 3ffff800008018
> [  132.359057] soft offline: 0x7400: migration failed 1, type 3ffff800008018
> 
> After the patch:
> 
> [   87.694325] soft offline: 0x5900: migration failed 1, type 3ffff800008018 (uptodate|dirty|head)
> [   87.736273] soft offline: 0x6c00: migration failed 1, type 3ffff800008018 (uptodate|dirty|head)
> 
> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>

Looks good to me, thank you!

Acked-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

> ---
>  mm/memory-failure.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 27f7210..fe64d77 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1543,8 +1543,8 @@ static int get_any_page(struct page *page, unsigned long pfn, int flags)
>  		if (ret == 1 && !PageLRU(page)) {
>  			/* Drop page reference which is from __get_any_page() */
>  			put_hwpoison_page(page);
> -			pr_info("soft_offline: %#lx: unknown non LRU page type %lx\n",
> -				pfn, page->flags);
> +			pr_info("soft_offline: %#lx: unknown non LRU page type %lx (%pGp)\n",
> +				pfn, page->flags, &page->flags);
>  			return -EIO;
>  		}
>  	}
> @@ -1585,8 +1585,8 @@ static int soft_offline_huge_page(struct page *page, int flags)
>  	ret = migrate_pages(&pagelist, new_page, NULL, MPOL_MF_MOVE_ALL,
>  				MIGRATE_SYNC, MR_MEMORY_FAILURE);
>  	if (ret) {
> -		pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
> -			pfn, ret, page->flags);
> +		pr_info("soft offline: %#lx: migration failed %d, type %lx (%pGp)\n",
> +			pfn, ret, page->flags, &page->flags);
>  		/*
>  		 * We know that soft_offline_huge_page() tries to migrate
>  		 * only one hugepage pointed to by hpage, so we need not
> @@ -1677,14 +1677,14 @@ static int __soft_offline_page(struct page *page, int flags)
>  			if (!list_empty(&pagelist))
>  				putback_movable_pages(&pagelist);
>  
> -			pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
> -				pfn, ret, page->flags);
> +			pr_info("soft offline: %#lx: migration failed %d, type %lx (%pGp)\n",
> +				pfn, ret, page->flags, &page->flags);
>  			if (ret > 0)
>  				ret = -EIO;
>  		}
>  	} else {
> -		pr_info("soft offline: %#lx: isolation failed: %d, page count %d, type %lx\n",
> -			pfn, ret, page_count(page), page->flags);
> +		pr_info("soft offline: %#lx: isolation failed: %d, page count %d, type %lx (%pGp)\n",
> +			pfn, ret, page_count(page), page->flags, &page->flags);
>  	}
>  	return ret;
>  }
> -- 
> 1.8.5.2
> 
>