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authorMatthew Wilcox <willy@infradead.org>2016-12-14 15:08:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-14 16:04:10 -0800
commit218ed7503aee07c7758dcbdd782e8c1a25c9f1e9 (patch)
treebd3301c4f53e70bdc3ac21106eaba4fc7e5ec7b7
parentbc412fca6edc25bbbe28b6449512e15ebb1573ae (diff)
radix-tree: improve dump output
Print the indices of the entries as unsigned (instead of signed) integers and print the parent node of each entry to help navigate around larger trees where the layout is not quite so obvious. Print the indices covered by a node. Rearrange the order of fields printed so the indices and parents line up for each type of entry. Link: http://lkml.kernel.org/r/1480369871-5271-53-git-send-email-mawilcox@linuxonhyperv.com Signed-off-by: Matthew Wilcox <willy@infradead.org> Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--lib/radix-tree.c49
1 files changed, 26 insertions, 23 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 368052ac468a..dbf4e8c8e100 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -214,15 +214,29 @@ radix_tree_find_next_bit(struct radix_tree_node *node, unsigned int tag,
return RADIX_TREE_MAP_SIZE;
}
+/*
+ * The maximum index which can be stored in a radix tree
+ */
+static inline unsigned long shift_maxindex(unsigned int shift)
+{
+ return (RADIX_TREE_MAP_SIZE << shift) - 1;
+}
+
+static inline unsigned long node_maxindex(struct radix_tree_node *node)
+{
+ return shift_maxindex(node->shift);
+}
+
#ifndef __KERNEL__
static void dump_node(struct radix_tree_node *node, unsigned long index)
{
unsigned long i;
- pr_debug("radix node: %p offset %d tags %lx %lx %lx shift %d count %d exceptional %d parent %p\n",
- node, node->offset,
+ pr_debug("radix node: %p offset %d indices %lu-%lu parent %p tags %lx %lx %lx shift %d count %d exceptional %d\n",
+ node, node->offset, index, index | node_maxindex(node),
+ node->parent,
node->tags[0][0], node->tags[1][0], node->tags[2][0],
- node->shift, node->count, node->exceptional, node->parent);
+ node->shift, node->count, node->exceptional);
for (i = 0; i < RADIX_TREE_MAP_SIZE; i++) {
unsigned long first = index | (i << node->shift);
@@ -230,14 +244,16 @@ static void dump_node(struct radix_tree_node *node, unsigned long index)
void *entry = node->slots[i];
if (!entry)
continue;
- if (is_sibling_entry(node, entry)) {
- pr_debug("radix sblng %p offset %ld val %p indices %ld-%ld\n",
- entry, i,
- *(void **)entry_to_node(entry),
- first, last);
+ if (entry == RADIX_TREE_RETRY) {
+ pr_debug("radix retry offset %ld indices %lu-%lu parent %p\n",
+ i, first, last, node);
} else if (!radix_tree_is_internal_node(entry)) {
- pr_debug("radix entry %p offset %ld indices %ld-%ld\n",
- entry, i, first, last);
+ pr_debug("radix entry %p offset %ld indices %lu-%lu parent %p\n",
+ entry, i, first, last, node);
+ } else if (is_sibling_entry(node, entry)) {
+ pr_debug("radix sblng %p offset %ld indices %lu-%lu parent %p val %p\n",
+ entry, i, first, last, node,
+ *(void **)entry_to_node(entry));
} else {
dump_node(entry_to_node(entry), first);
}
@@ -455,19 +471,6 @@ int radix_tree_maybe_preload_order(gfp_t gfp_mask, int order)
return __radix_tree_preload(gfp_mask, nr_nodes);
}
-/*
- * The maximum index which can be stored in a radix tree
- */
-static inline unsigned long shift_maxindex(unsigned int shift)
-{
- return (RADIX_TREE_MAP_SIZE << shift) - 1;
-}
-
-static inline unsigned long node_maxindex(struct radix_tree_node *node)
-{
- return shift_maxindex(node->shift);
-}
-
static unsigned radix_tree_load_root(struct radix_tree_root *root,
struct radix_tree_node **nodep, unsigned long *maxindex)
{