[PATCHv3 17/41] filemap: handle huge pages in filemap_fdatawait_range()

From	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Newsgroups	linux.kernel
Subject	[PATCHv3 17/41] filemap: handle huge pages in filemap_fdatawait_range()
Date	2016-09-15 14:20 +0200
Message-ID	<shDO2-6VP-9@gated-at.bofh.it> (permalink)
References	<shDuF-6vN-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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We writeback whole huge page a time.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 mm/filemap.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/filemap.c b/mm/filemap.c
index 05b42d3e5ed8..53da93156e60 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -372,9 +372,14 @@ static int __filemap_fdatawait_range(struct address_space *mapping,
 			if (page->index > end)
 				continue;
 
+			page = compound_head(page);
 			wait_on_page_writeback(page);
 			if (TestClearPageError(page))
 				ret = -EIO;
+			if (PageTransHuge(page)) {
+				index = page->index + HPAGE_PMD_NR;
+				i += index - pvec.pages[i]->index - 1;
+			}
 		}
 		pagevec_release(&pvec);
 		cond_resched();
-- 
2.9.3

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[PATCHv3 17/41] filemap: handle huge pages in filemap_fdatawait_range() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-09-15 14:20 +0200

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