- radixtree-introduce-radix_tree_scan_hole.patch removed from -mm tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The patch titled
     radixtree: introduce radix_tree_scan_hole[_backward]()
has been removed from the -mm tree.  Its filename was
     radixtree-introduce-radix_tree_scan_hole.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
Subject: radixtree: introduce radix_tree_scan_hole[_backward]()
From: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>

Introduce a pair of functions to scan radix tree for hole/empty item.
	- radix_tree_scan_hole(root, index, max_scan)
	- radix_tree_scan_hole_backward(root, index, max_scan)

The implementation is dumb and obviously correct.
It will help to debug the smart ones to be introduced in future.

Signed-off-by: Wu Fengguang <wfg@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---

 include/linux/radix-tree.h |    4 +
 lib/radix-tree.c           |   71 +++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff -puN include/linux/radix-tree.h~radixtree-introduce-radix_tree_scan_hole include/linux/radix-tree.h
--- a/include/linux/radix-tree.h~radixtree-introduce-radix_tree_scan_hole
+++ a/include/linux/radix-tree.h
@@ -156,6 +156,10 @@ void *radix_tree_delete(struct radix_tre
 unsigned int
 radix_tree_gang_lookup(struct radix_tree_root *root, void **results,
 			unsigned long first_index, unsigned int max_items);
+unsigned long radix_tree_scan_hole_backward(struct radix_tree_root *root,
+				unsigned long index, unsigned long max_scan);
+unsigned long radix_tree_scan_hole(struct radix_tree_root *root,
+				unsigned long index, unsigned long max_scan);
 int radix_tree_preload(gfp_t gfp_mask);
 void radix_tree_init(void);
 void *radix_tree_tag_set(struct radix_tree_root *root,
diff -puN lib/radix-tree.c~radixtree-introduce-radix_tree_scan_hole lib/radix-tree.c
--- a/lib/radix-tree.c~radixtree-introduce-radix_tree_scan_hole
+++ a/lib/radix-tree.c
@@ -598,6 +598,77 @@ int radix_tree_tag_get(struct radix_tree
 EXPORT_SYMBOL(radix_tree_tag_get);
 #endif
 
+static unsigned long radix_tree_scan_hole_dumb(struct radix_tree_root *root,
+				unsigned long index, unsigned long max_scan)
+{
+	unsigned long i;
+
+	for (i = 0; i < max_scan; i++) {
+		if (!radix_tree_lookup(root, index + i))
+			break;
+		if (index + i == ULONG_MAX)
+			break;
+	}
+
+	return index + i;
+}
+
+static unsigned long radix_tree_scan_hole_backward_dumb(
+				struct radix_tree_root *root,
+				unsigned long index, unsigned long max_scan)
+{
+	unsigned long i;
+
+	for (i = 0; i < max_scan; i++) {
+		if (!radix_tree_lookup(root, index - i))
+			break;
+		if (index - i == 0)
+			break;
+	}
+
+	return index - i;
+}
+
+/**
+ *	radix_tree_scan_hole    -    scan for hole
+ *	@root:		radix tree root
+ *	@index:		index key
+ *	@max_scan:      advice on max items to scan (it may scan a little more)
+ *
+ *      Scan forward from @index for a hole/empty item, stop when
+ *      - hit hole
+ *      - hit index ULONG_MAX
+ *      - @max_scan or more items scanned
+ *
+ *      One can be sure that (@returned_index >= @index).
+ */
+unsigned long radix_tree_scan_hole(struct radix_tree_root *root,
+				unsigned long index, unsigned long max_scan)
+{
+	return radix_tree_scan_hole_dumb(root, index, max_scan);
+}
+EXPORT_SYMBOL(radix_tree_scan_hole);
+
+/**
+ *	radix_tree_scan_hole_backward    -    scan backward for hole
+ *	@root:		radix tree root
+ *	@index:		index key
+ *	@max_scan:      advice on max items to scan (it may scan a little more)
+ *
+ *      Scan backward from @index for a hole/empty item, stop when
+ *      - hit hole
+ *      - hit index 0
+ *      - @max_scan or more items scanned
+ *
+ *      One can be sure that (@returned_index <= @index).
+ */
+unsigned long radix_tree_scan_hole_backward(struct radix_tree_root *root,
+				unsigned long index, unsigned long max_scan)
+{
+	return radix_tree_scan_hole_backward_dumb(root, index, max_scan);
+}
+EXPORT_SYMBOL(radix_tree_scan_hole_backward);
+
 static unsigned int
 __lookup(struct radix_tree_node *slot, void **results, unsigned long index,
 	unsigned int max_items, unsigned long *next_index)
_

Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are

radixtree-introduce-radix_tree_scan_hole.patch
mm-introduce-probe_page.patch
mm-introduce-pg_readahead.patch
readahead-add-look-ahead-support-to-__do_page_cache_readahead.patch
readahead-delay-page-release-in-do_generic_mapping_read.patch
readahead-insert-cond_resched-calls.patch
readahead-minmax_ra_pages.patch
readahead-events-accounting.patch
readahead-rescue_pages.patch
readahead-sysctl-parameters.patch
readahead-min-max-sizes.patch
readahead-state-based-method-aging-accounting.patch
readahead-state-based-method-routines.patch
readahead-state-based-method.patch
readahead-context-based-method.patch
readahead-initial-method-guiding-sizes.patch
readahead-initial-method-thrashing-guard-size.patch
readahead-initial-method-expected-read-size.patch
readahead-initial-method-user-recommended-size.patch
readahead-initial-method.patch
readahead-backward-prefetching-method.patch
readahead-seeking-reads-method.patch
readahead-thrashing-recovery-method.patch
readahead-call-scheme.patch
readahead-laptop-mode.patch
readahead-loop-case.patch
readahead-nfsd-case.patch
readahead-turn-on-by-default.patch
readahead-debug-radix-tree-new-functions.patch
readahead-debug-traces-showing-accessed-file-names.patch
readahead-debug-traces-showing-read-patterns.patch
readahead-remove-size-limit-on-read_ahead_kb.patch
readahead-backward-prefetching-method-fix.patch
readahead-remove-the-size-limit-of-max_sectors_kb-on-read_ahead_kb.patch

-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Kernel Newbies FAQ]     [Kernel Archive]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [Bugtraq]     [Photo]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]

  Powered by Linux