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From: Qian Cai <cai@lca.pw>
To: Matthew Wilcox <willy@infradead.org>
Cc: Huang Ying <ying.huang@intel.com>, linux-mm@kvack.org
Subject: Re: page cache: Store only head pages in i_pages
Date: Sat, 23 Mar 2019 19:50:15 -0400
Message-ID: <f26c4cce-5f71-5235-8980-86d8fcd69ce6@lca.pw> (raw)
In-Reply-To: <20190323033852.GC10344@bombadil.infradead.org>



On 3/22/19 11:38 PM, Matthew Wilcox wrote:
> On Fri, Mar 22, 2019 at 04:12:48PM -0400, Qian Cai wrote:
>> FYI, every thing involve swapping seems triggered a panic now since this patch.
> 
> Thanks for the report!  Does this fix it?
> 
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 41858a3744b4..975aea9a49a5 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -335,6 +335,8 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping,
>  static inline struct page *find_subpage(struct page *page, pgoff_t offset)
>  {
>  	VM_BUG_ON_PAGE(PageTail(page), page);
> +	if (unlikely(PageSwapCache(page)))
> +		return page;
>  	VM_BUG_ON_PAGE(page->index > offset, page);
>  	VM_BUG_ON_PAGE(page->index + compound_nr(page) <= offset, page);
>  	return page - page->index + offset;

Yes, it works.


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1553285568.26196.24.camel@lca.pw>
2019-03-23  3:38 ` Matthew Wilcox
2019-03-23 23:50   ` Qian Cai [this message]
2019-03-24  2:06     ` Matthew Wilcox
2019-03-24  2:52       ` Qian Cai
2019-03-24  3:04         ` Matthew Wilcox
2019-03-24 15:42           ` Qian Cai
2019-03-27 10:48           ` William Kucharski
2019-03-27 11:50             ` Matthew Wilcox
2019-03-29  1:43           ` Qian Cai
2019-03-29 19:59             ` Matthew Wilcox
2019-03-29 21:25               ` Qian Cai
2019-03-30  3:04                 ` Matthew Wilcox
2019-03-30 14:10                   ` Matthew Wilcox
2019-03-31  3:23                     ` Matthew Wilcox
2019-04-01  9:18                       ` Kirill A. Shutemov
2019-04-01  9:27                         ` Kirill A. Shutemov
2019-04-04 13:10                           ` Qian Cai
2019-04-04 13:45                             ` Kirill A. Shutemov
2019-04-04 21:28                               ` Qian Cai
2019-04-05 13:37                                 ` Kirill A. Shutemov
2019-04-05 13:51                                   ` Matthew Wilcox

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