From: Matthew Wilcox <willy@infradead.org>
To: Qian Cai <cai@lca.pw>
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 19:06:14 -0700 [thread overview]
Message-ID: <20190324020614.GD10344@bombadil.infradead.org> (raw)
In-Reply-To: <f26c4cce-5f71-5235-8980-86d8fcd69ce6@lca.pw>
On Sat, Mar 23, 2019 at 07:50:15PM -0400, Qian Cai wrote:
> 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.
>
> Yes, it works.
Thanks for testing. Kirill suggests this would be a better fix:
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 41858a3744b4..9718393ae45b 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -334,10 +334,12 @@ 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 + compound_nr(page) <= offset, page);
- return page - page->index + offset;
+ VM_BUG_ON_PAGE(index > offset, page);
+ VM_BUG_ON_PAGE(index + compound_nr(page) <= offset, page);
+ return page - index + offset;
}
struct page *find_get_entry(struct address_space *mapping, pgoff_t offset);
next prev parent reply other threads:[~2019-03-24 2:06 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 [this message]
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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