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: Sun, 24 Mar 2019 11:42:23 -0400 [thread overview]
Message-ID: <0d7ae84f-268a-aefc-ee01-5db9b7327c8e@lca.pw> (raw)
In-Reply-To: <20190324030422.GE10344@bombadil.infradead.org>
On 3/23/19 11:04 PM, Matthew Wilcox wrote:
> The patch for you should have looked like this:
>
> @@ -335,11 +335,12 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping,
>
> static inline struct page *find_subpage(struct page *page, pgoff_t offset)
> {
> + unsigned long index = page_index(page);
> +
> VM_BUG_ON_PAGE(PageTail(page), page);
> - VM_BUG_ON_PAGE(page->index > offset, page);
> - VM_BUG_ON_PAGE(page->index + (1 << compound_order(page)) <= offset,
> - page);
> - return page - page->index + offset;
> + VM_BUG_ON_PAGE(index > offset, page);
> + VM_BUG_ON_PAGE(index + (1 << compound_order(page)) <= offset, page);
> + return page - index + offset;
> }
It works great.
next prev parent reply other threads:[~2019-03-24 15:42 UTC|newest]
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 ` page cache: Store only head pages in i_pages Matthew Wilcox
2019-03-23 23:50 ` Qian Cai
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 [this message]
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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