From: "Kirill A. Shutemov" Subject: [PATCHv4 20/43] mm: make write_cache_pages() work on huge pages Date: Tue, 25 Oct 2016 03:13:19 +0300 Message-ID: <20161025001342.76126-21-kirill.shutemov@linux.intel.com> References: <20161025001342.76126-1-kirill.shutemov@linux.intel.com> Cc: Alexander Viro , Hugh Dickins , Andrea Arcangeli , Dave Hansen , Vlastimil Babka , Matthew Wilcox , Ross Zwisler , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, "Kirill A. Shutemov" To: "Theodore Ts'o" , Andreas Dilger , Jan Kara , Andrew Morton Return-path: In-Reply-To: <20161025001342.76126-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org We writeback whole huge page a time. Let's adjust iteration this way. Signed-off-by: Kirill A. Shutemov --- include/linux/mm.h | 1 + include/linux/pagemap.h | 1 + mm/page-writeback.c | 17 ++++++++++++----- 3 files changed, 14 insertions(+), 5 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 3a191853faaa..315df8051d06 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1056,6 +1056,7 @@ extern pgoff_t __page_file_index(struct page *page); */ static inline pgoff_t page_index(struct page *page) { + page = compound_head(page); if (unlikely(PageSwapCache(page))) return __page_file_index(page); return page->index; diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 712343108d31..f9aa8bede15e 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -528,6 +528,7 @@ static inline void wait_on_page_locked(struct page *page) */ static inline void wait_on_page_writeback(struct page *page) { + page = compound_head(page); if (PageWriteback(page)) wait_on_page_bit(page, PG_writeback); } diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 439cc63ad903..c76fc90b7039 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2200,7 +2200,7 @@ int write_cache_pages(struct address_space *mapping, * mapping. However, page->index will not change * because we have a reference on the page. */ - if (page->index > end) { + if (page_to_pgoff(page) > end) { /* * can't be range_cyclic (1st pass) because * end == -1 in that case. @@ -2209,7 +2209,12 @@ int write_cache_pages(struct address_space *mapping, break; } - done_index = page->index; + done_index = page_to_pgoff(page); + if (PageTransCompound(page)) { + index = round_up(index + 1, HPAGE_PMD_NR); + i += HPAGE_PMD_NR - + done_index % HPAGE_PMD_NR - 1; + } lock_page(page); @@ -2221,7 +2226,7 @@ int write_cache_pages(struct address_space *mapping, * even if there is now a new, dirty page at the same * pagecache address. */ - if (unlikely(page->mapping != mapping)) { + if (unlikely(page_mapping(page) != mapping)) { continue_unlock: unlock_page(page); continue; @@ -2259,7 +2264,8 @@ int write_cache_pages(struct address_space *mapping, * not be suitable for data integrity * writeout). */ - done_index = page->index + 1; + done_index = compound_head(page)->index + + hpage_nr_pages(page); done = 1; break; } @@ -2271,7 +2277,8 @@ int write_cache_pages(struct address_space *mapping, * keep going until we have written all the pages * we tagged for writeback prior to entering this loop. */ - if (--wbc->nr_to_write <= 0 && + wbc->nr_to_write -= hpage_nr_pages(page); + if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { done = 1; break; -- 2.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org