From: "Kirill A. Shutemov" Subject: [PATCHv1, RFC 19/33] mm: make write_cache_pages() work on huge pages Date: Tue, 26 Jul 2016 03:35:21 +0300 Message-ID: <1469493335-3622-20-git-send-email-kirill.shutemov@linux.intel.com> References: <1469493335-3622-1-git-send-email-kirill.shutemov@linux.intel.com> Cc: Alexander Viro , Hugh Dickins , Andrea Arcangeli , Andrew Morton , 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 Return-path: In-Reply-To: <1469493335-3622-1-git-send-email-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 08ed53eeedd5..b68d77912313 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1054,6 +1054,7 @@ struct address_space *page_file_mapping(struct page *page) */ static inline pgoff_t page_index(struct page *page) { + page = compound_head(page); if (unlikely(PageSwapCache(page))) return page_private(page); return page->index; diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index d9cf4e0f35dc..24e14ef1cfe5 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -518,6 +518,7 @@ 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 573d138fa7a5..48409726d226 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2246,7 +2246,7 @@ retry: * 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. @@ -2255,7 +2255,12 @@ retry: 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); @@ -2267,7 +2272,7 @@ retry: * 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; @@ -2305,7 +2310,8 @@ continue_unlock: * 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; } @@ -2317,7 +2323,8 @@ continue_unlock: * 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; -- 2.8.1 -- 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