linux-kernel - Re: [PATCH v2 2/3] mm/memory-failure.c: avoid calling invalidate_inode

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Date:   Sun, 13 Mar 2022 23:41:57 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
        "shy828301@...il.com" <shy828301@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] mm/memory-failure.c: avoid calling
 invalidate_inode_page() with unexpected pages

On Sat, Mar 12, 2022 at 03:46:12PM +0800, Miaohe Lin wrote:
> Since commit 042c4f32323b ("mm/truncate: Inline invalidate_complete_page()

This commit ID does not exist in mainline (or in the latest mmotm?),
so you can't use it in patch description.  Could you update this part?

Thanks,
Naoya Horiguchi

> into its one caller"), invalidate_inode_page() can invalidate the pages in
> the swap cache because the check of page->mapping != mapping is removed.
> But invalidate_inode_page() is not expected to deal with the pages in swap
> cache. Also non-lru movable page can reach here too. They're not page cache
> pages. Skip these pages by checking PageSwapCache and PageLRU.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/memory-failure.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index dabecd87ad3f..2ff7dd2078c4 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -2190,7 +2190,7 @@ static int __soft_offline_page(struct page *page)
>  		return 0;
>  	}
>  
> -	if (!PageHuge(page))
> +	if (!PageHuge(page) && PageLRU(page) && !PageSwapCache(page))
>  		/*
>  		 * Try to invalidate first. This should work for
>  		 * non dirty unmapped page cache pages.
> -- 
> 2.23.0