From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v5 54/78] fs: Convert writeback to XArray Date: Fri, 15 Dec 2017 14:04:26 -0800 Message-ID: <20171215220450.7899-55-willy@infradead.org> References: <20171215220450.7899-1-willy@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20171215220450.7899-1-willy@infradead.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: linux-kernel@vger.kernel.org Cc: Jens Axboe , linux-xfs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-raid@vger.kernel.org, Matthew Wilcox , Marc Zyngier , linux-usb@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, David Howells , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Ross Zwisler , Rehas Sachdeva , Shaohua Li , linux-btrfs@vger.kernel.org List-Id: linux-raid.ids From: Matthew Wilcox A couple of short loops. Signed-off-by: Matthew Wilcox --- fs/fs-writeback.c | 25 +++++++++---------------- 1 file changed, 9 insertions(+), 16 deletions(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index e2c1ca667d9a..897a89489fe9 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -339,9 +339,9 @@ static void inode_switch_wbs_work_fn(struct work_struct *work) struct address_space *mapping = inode->i_mapping; struct bdi_writeback *old_wb = inode->i_wb; struct bdi_writeback *new_wb = isw->new_wb; - struct radix_tree_iter iter; + XA_STATE(xas, &mapping->pages, 0); + struct page *page; bool switched = false; - void **slot; /* * By the time control reaches here, RCU grace period has passed @@ -375,25 +375,18 @@ static void inode_switch_wbs_work_fn(struct work_struct *work) * to possibly dirty pages while PAGECACHE_TAG_WRITEBACK points to * pages actually under writeback. */ - radix_tree_for_each_tagged(slot, &mapping->pages, &iter, 0, - PAGECACHE_TAG_DIRTY) { - struct page *page = radix_tree_deref_slot_protected(slot, - &mapping->pages.xa_lock); - if (likely(page) && PageDirty(page)) { + xas_for_each_tag(&xas, page, ULONG_MAX, PAGECACHE_TAG_DIRTY) { + if (PageDirty(page)) { dec_wb_stat(old_wb, WB_RECLAIMABLE); inc_wb_stat(new_wb, WB_RECLAIMABLE); } } - radix_tree_for_each_tagged(slot, &mapping->pages, &iter, 0, - PAGECACHE_TAG_WRITEBACK) { - struct page *page = radix_tree_deref_slot_protected(slot, - &mapping->pages.xa_lock); - if (likely(page)) { - WARN_ON_ONCE(!PageWriteback(page)); - dec_wb_stat(old_wb, WB_WRITEBACK); - inc_wb_stat(new_wb, WB_WRITEBACK); - } + xas_set(&xas, 0); + xas_for_each_tag(&xas, page, ULONG_MAX, PAGECACHE_TAG_WRITEBACK) { + WARN_ON_ONCE(!PageWriteback(page)); + dec_wb_stat(old_wb, WB_WRITEBACK); + inc_wb_stat(new_wb, WB_WRITEBACK); } wb_get(new_wb); -- 2.15.1 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot