From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Date: Wed, 17 Jan 2018 20:21:13 +0000 Subject: [PATCH v6 49/99] shmem: Convert shmem_partial_swap_usage to XArray Message-Id: <20180117202203.19756-50-willy@infradead.org> List-Id: References: <20180117202203.19756-1-willy@infradead.org> In-Reply-To: <20180117202203.19756-1-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org Cc: Matthew Wilcox , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-usb@vger.kernel.org, Bjorn Andersson , Stefano Stabellini , iommu@lists.linux-foundation.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org, linux-sh@vger.kernel.org, David Howells From: Matthew Wilcox Simpler code because the xarray takes care of things like the limit and dereferencing the slot. Signed-off-by: Matthew Wilcox --- mm/shmem.c | 18 +++--------------- 1 file changed, 3 insertions(+), 15 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 5a2226e06f8c..4dbcfb436bd1 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -658,29 +658,17 @@ static int shmem_free_swap(struct address_space *mapping, unsigned long shmem_partial_swap_usage(struct address_space *mapping, pgoff_t start, pgoff_t end) { - struct radix_tree_iter iter; - void **slot; + XA_STATE(xas, &mapping->pages, start); struct page *page; unsigned long swapped = 0; rcu_read_lock(); - - radix_tree_for_each_slot(slot, &mapping->pages, &iter, start) { - if (iter.index >= end) - break; - - page = radix_tree_deref_slot(slot); - - if (radix_tree_deref_retry(page)) { - slot = radix_tree_iter_retry(&iter); - continue; - } - + xas_for_each(&xas, page, end - 1) { if (xa_is_value(page)) swapped++; if (need_resched()) { - slot = radix_tree_iter_resume(slot, &iter); + xas_pause(&xas); cond_resched_rcu(); } } -- 2.15.1