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From: Matthew Wilcox <willy@infradead.org>
To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
	Jeff Layton <jlayton@redhat.com>,
	Lukas Czerner <lczerner@redhat.com>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	Christoph Hellwig <hch@lst.de>,
	Goldwyn Rodrigues <rgoldwyn@suse.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>,
	linux-nilfs@vger.kernel.org, Jaegeuk Kim <jaegeuk@kernel.org>,
	Chao Yu <yuchao0@huawei.com>,
	linux-f2fs-devel@lists.sourceforge.net
Subject: [PATCH v14 29/74] page cache: Convert find_get_entries_tag to XArray
Date: Sat, 16 Jun 2018 19:00:07 -0700	[thread overview]
Message-ID: <20180617020052.4759-30-willy@infradead.org> (raw)
In-Reply-To: <20180617020052.4759-1-willy@infradead.org>

Slightly shorter and simpler code.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
---
 include/linux/pagemap.h |  2 +-
 mm/filemap.c            | 54 ++++++++++++++++++-----------------------
 2 files changed, 25 insertions(+), 31 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a6d635fefb01..442977811b59 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -373,7 +373,7 @@ static inline unsigned find_get_pages_tag(struct address_space *mapping,
 					nr_pages, pages);
 }
 unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
-			int tag, unsigned int nr_entries,
+			xa_tag_t tag, unsigned int nr_entries,
 			struct page **entries, pgoff_t *indices);
 
 struct page *grab_cache_page_write_begin(struct address_space *mapping,
diff --git a/mm/filemap.c b/mm/filemap.c
index 83328635edaa..67f04bcdf9ef 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1866,57 +1866,51 @@ EXPORT_SYMBOL(find_get_pages_range_tag);
  * @tag.
  */
 unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
-			int tag, unsigned int nr_entries,
+			xa_tag_t tag, unsigned int nr_entries,
 			struct page **entries, pgoff_t *indices)
 {
-	void **slot;
+	XA_STATE(xas, &mapping->i_pages, start);
+	struct page *page;
 	unsigned int ret = 0;
-	struct radix_tree_iter iter;
 
 	if (!nr_entries)
 		return 0;
 
 	rcu_read_lock();
-	radix_tree_for_each_tagged(slot, &mapping->i_pages, &iter, start, tag) {
-		struct page *head, *page;
-repeat:
-		page = radix_tree_deref_slot(slot);
-		if (unlikely(!page))
+	xas_for_each_tagged(&xas, page, ULONG_MAX, tag) {
+		struct page *head;
+		if (xas_retry(&xas, page))
 			continue;
-		if (radix_tree_exception(page)) {
-			if (radix_tree_deref_retry(page)) {
-				slot = radix_tree_iter_retry(&iter);
-				continue;
-			}
-
-			/*
-			 * A shadow entry of a recently evicted page, a swap
-			 * entry from shmem/tmpfs or a DAX entry.  Return it
-			 * without attempting to raise page count.
-			 */
+		/*
+		 * A shadow entry of a recently evicted page, a swap
+		 * entry from shmem/tmpfs or a DAX entry.  Return it
+		 * without attempting to raise page count.
+		 */
+		if (xa_is_value(page))
 			goto export;
-		}
 
 		head = compound_head(page);
 		if (!page_cache_get_speculative(head))
-			goto repeat;
+			goto retry;
 
 		/* The page was split under us? */
-		if (compound_head(page) != head) {
-			put_page(head);
-			goto repeat;
-		}
+		if (compound_head(page) != head)
+			goto put_page;
 
 		/* Has the page moved? */
-		if (unlikely(page != *slot)) {
-			put_page(head);
-			goto repeat;
-		}
+		if (unlikely(page != xas_reload(&xas)))
+			goto put_page;
+
 export:
-		indices[ret] = iter.index;
+		indices[ret] = xas.xa_index;
 		entries[ret] = page;
 		if (++ret == nr_entries)
 			break;
+		continue;
+put_page:
+		put_page(head);
+retry:
+		xas_reset(&xas);
 	}
 	rcu_read_unlock();
 	return ret;
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Matthew Wilcox <willy@infradead.org>
To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: linux-nilfs@vger.kernel.org, Jan Kara <jack@suse.cz>,
	Jeff Layton <jlayton@redhat.com>,
	Jaegeuk Kim <jaegeuk@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	linux-f2fs-devel@lists.sourceforge.net,
	Nicholas Piggin <npiggin@gmail.com>,
	Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>,
	Lukas Czerner <lczerner@redhat.com>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	Christoph Hellwig <hch@lst.de>,
	Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH v14 29/74] page cache: Convert find_get_entries_tag to XArray
Date: Sat, 16 Jun 2018 19:00:07 -0700	[thread overview]
Message-ID: <20180617020052.4759-30-willy@infradead.org> (raw)
In-Reply-To: <20180617020052.4759-1-willy@infradead.org>

Slightly shorter and simpler code.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
---
 include/linux/pagemap.h |  2 +-
 mm/filemap.c            | 54 ++++++++++++++++++-----------------------
 2 files changed, 25 insertions(+), 31 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a6d635fefb01..442977811b59 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -373,7 +373,7 @@ static inline unsigned find_get_pages_tag(struct address_space *mapping,
 					nr_pages, pages);
 }
 unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
-			int tag, unsigned int nr_entries,
+			xa_tag_t tag, unsigned int nr_entries,
 			struct page **entries, pgoff_t *indices);
 
 struct page *grab_cache_page_write_begin(struct address_space *mapping,
diff --git a/mm/filemap.c b/mm/filemap.c
index 83328635edaa..67f04bcdf9ef 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1866,57 +1866,51 @@ EXPORT_SYMBOL(find_get_pages_range_tag);
  * @tag.
  */
 unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
-			int tag, unsigned int nr_entries,
+			xa_tag_t tag, unsigned int nr_entries,
 			struct page **entries, pgoff_t *indices)
 {
-	void **slot;
+	XA_STATE(xas, &mapping->i_pages, start);
+	struct page *page;
 	unsigned int ret = 0;
-	struct radix_tree_iter iter;
 
 	if (!nr_entries)
 		return 0;
 
 	rcu_read_lock();
-	radix_tree_for_each_tagged(slot, &mapping->i_pages, &iter, start, tag) {
-		struct page *head, *page;
-repeat:
-		page = radix_tree_deref_slot(slot);
-		if (unlikely(!page))
+	xas_for_each_tagged(&xas, page, ULONG_MAX, tag) {
+		struct page *head;
+		if (xas_retry(&xas, page))
 			continue;
-		if (radix_tree_exception(page)) {
-			if (radix_tree_deref_retry(page)) {
-				slot = radix_tree_iter_retry(&iter);
-				continue;
-			}
-
-			/*
-			 * A shadow entry of a recently evicted page, a swap
-			 * entry from shmem/tmpfs or a DAX entry.  Return it
-			 * without attempting to raise page count.
-			 */
+		/*
+		 * A shadow entry of a recently evicted page, a swap
+		 * entry from shmem/tmpfs or a DAX entry.  Return it
+		 * without attempting to raise page count.
+		 */
+		if (xa_is_value(page))
 			goto export;
-		}
 
 		head = compound_head(page);
 		if (!page_cache_get_speculative(head))
-			goto repeat;
+			goto retry;
 
 		/* The page was split under us? */
-		if (compound_head(page) != head) {
-			put_page(head);
-			goto repeat;
-		}
+		if (compound_head(page) != head)
+			goto put_page;
 
 		/* Has the page moved? */
-		if (unlikely(page != *slot)) {
-			put_page(head);
-			goto repeat;
-		}
+		if (unlikely(page != xas_reload(&xas)))
+			goto put_page;
+
 export:
-		indices[ret] = iter.index;
+		indices[ret] = xas.xa_index;
 		entries[ret] = page;
 		if (++ret == nr_entries)
 			break;
+		continue;
+put_page:
+		put_page(head);
+retry:
+		xas_reset(&xas);
 	}
 	rcu_read_unlock();
 	return ret;
-- 
2.17.1


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  parent reply	other threads:[~2018-06-17  2:18 UTC|newest]

Thread overview: 162+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-17  1:59 [PATCH v14 00/74] Convert page cache to XArray Matthew Wilcox
2018-06-17  1:59 ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 01/74] Update email address Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 02/74] radix tree test suite: Enable ubsan Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 03/74] dax: Fix use of zero page Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 04/74] xarray: Replace exceptional entries Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 05/74] xarray: Change definition of sibling entries Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 06/74] xarray: Add definition of struct xarray Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 07/74] xarray: Define struct xa_node Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 08/74] xarray: Add documentation Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 09/74] xarray: Add XArray load operation Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 10/74] xarray: Add XArray tags Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 11/74] xarray: Add XArray unconditional store operations Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 12/74] xarray: Add XArray conditional " Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 13/74] xarray: Add XArray iterators Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 14/74] xarray: Extract entries from an XArray Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 15/74] xarray: Destroy " Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 16/74] xarray: Step through " Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 17/74] xarray: Add xas_for_each_conflict Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 18/74] xarray: Add xas_create_range Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 19/74] xarray: Add MAINTAINERS entry Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 20/74] page cache: Rearrange address_space Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  1:59 ` [PATCH v14 21/74] page cache: Convert hole search to XArray Matthew Wilcox
2018-06-17  1:59   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 22/74] page cache: Add and replace pages using the XArray Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 23/74] page cache: Convert page deletion to XArray Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 24/74] page cache: Convert find_get_entry " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 25/74] page cache: Convert find_get_entries " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 26/74] page cache: Convert find_get_pages_range " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 27/74] page cache: Convert find_get_pages_contig " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 28/74] page cache; Convert find_get_pages_range_tag " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` Matthew Wilcox [this message]
2018-06-17  2:00   ` [PATCH v14 29/74] page cache: Convert find_get_entries_tag " Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 30/74] page cache: Convert filemap_map_pages " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 31/74] radix tree test suite: Convert regression1 " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 32/74] page cache: Convert delete_batch " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 33/74] page cache: Remove stray radix comment Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 34/74] page cache: Convert filemap_range_has_page to XArray Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 35/74] mm: Convert page-writeback " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 36/74] mm: Convert workingset " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 37/74] mm: Convert truncate " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 38/74] mm: Convert add_to_swap_cache " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 39/74] mm: Convert delete_from_swap_cache " Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 40/74] mm: Convert __do_page_cache_readahead " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 41/74] mm: Convert page migration " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 42/74] mm: Convert huge_memory " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 43/74] mm: Convert collapse_shmem " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 44/74] mm: Convert khugepaged_scan_shmem " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 45/74] mm: Convert is_page_cache_freeable " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 46/74] pagevec: Use xa_tag_t Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 47/74] shmem: Convert shmem_radix_tree_replace to XArray Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 48/74] shmem: Convert shmem_confirm_swap " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 49/74] shmem: Convert find_swap_entry " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 50/74] shmem: Convert shmem_add_to_page_cache " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 51/74] shmem: Convert shmem_alloc_hugepage " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 52/74] shmem: Convert shmem_free_swap " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 53/74] shmem: Convert shmem_partial_swap_usage " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 54/74] memfd: Convert memfd_wait_for_pins " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 55/74] memfd: Convert memfd_tag_pins " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 56/74] shmem: Comment fixups Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 57/74] btrfs: Convert page cache to XArray Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 58/74] fs: Convert buffer " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 59/74] fs: Convert writeback " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 60/74] nilfs2: Convert " Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 61/74] f2fs: " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 62/74] dax: Rename some functions Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 63/74] dax: Hash on XArray instead of mapping Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 64/74] dax: Convert dax_insert_pfn_mkwrite to XArray Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 65/74] dax: Convert dax_layout_busy_page " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 66/74] dax: Convert __dax_invalidate_entry " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 67/74] dax: Convert dax writeback " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 68/74] dax: Convert dax_lock_page " Matthew Wilcox
2018-06-29 17:30   ` Ross Zwisler
2018-06-29 17:30     ` Ross Zwisler
2018-07-06 11:54     ` [PATCH] fs/dax: remove unused function Anders Roxell
2018-07-06 13:04     ` [PATCH v14 68/74] dax: Convert dax_lock_page to XArray Matthew Wilcox
2018-07-06 13:04       ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 69/74] dax: Convert page fault handlers " Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 70/74] page cache: Finish XArray conversion Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 71/74] radix tree: Remove radix_tree_update_node_t Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 72/74] radix tree: Remove split/join code Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 73/74] radix tree: Remove radix_tree_maybe_preload_order Matthew Wilcox
2018-06-17  2:00 ` [PATCH v14 74/74] radix tree: Remove radix_tree_clear_tags Matthew Wilcox
2018-06-17  2:00   ` Matthew Wilcox
2018-06-19  3:12 ` [PATCH v14 00/74] Convert page cache to XArray Ross Zwisler
2018-06-19  9:22   ` Matthew Wilcox
2018-06-19 16:40     ` Ross Zwisler
2018-06-19 17:16       ` Matthew Wilcox
2018-06-27 11:05         ` Matthew Wilcox
2018-06-27 11:05           ` Matthew Wilcox
2018-06-27 19:44           ` Ross Zwisler
2018-06-28  8:39             ` Matthew Wilcox
2018-06-28 16:30               ` Ross Zwisler
2018-07-25 21:03             ` Matthew Wilcox
2018-07-25 21:12               ` Ross Zwisler
2018-07-27 17:20               ` Ross Zwisler
2018-07-27 17:20                 ` Ross Zwisler
2018-07-30 15:43                 ` Matthew Wilcox

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