Messages in this thread Patch in this message | | | From | Alex Snast <> | Subject | [PATCH 1/2] perf tools: Use postorder rbtree iteration when removing symbols | Date | Sat, 19 Sep 2015 16:03:34 +0300 |
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Avoid using rb_erase when removing symbols as it requires rbtree rebalancing, instead preform a post order iteration when deleting tree symbols.
Signed-off-by: Alex Snast <asnast@gmail.com> --- tools/include/linux/rbtree.h | 14 ++++++++++++++ tools/perf/util/symbol.c | 11 ++++------- 2 files changed, 18 insertions(+), 7 deletions(-)
diff --git a/tools/include/linux/rbtree.h b/tools/include/linux/rbtree.h index 1125822..14c646d 100644 --- a/tools/include/linux/rbtree.h +++ b/tools/include/linux/rbtree.h @@ -90,6 +90,20 @@ static inline void rb_link_node(struct rb_node *node, struct rb_node *parent, ____ptr ? rb_entry(____ptr, type, member) : NULL; \ }) +/** + * rbtree_postorder_for_each_entry_safe - iterate over rb_root in post order of + * given type safe against removal of rb_node entry + * + * @pos: the 'type *' to use as a loop cursor. + * @n: another 'type *' to use as temporary storage + * @root: 'rb_root *' of the rbtree. + * @field: the name of the rb_node field within 'type'. + */ +#define rbtree_postorder_for_each_entry_safe(pos, n, root, field) \ + for (pos = rb_entry_safe(rb_first_postorder(root), typeof(*pos), field); \ + pos && ({ n = rb_entry_safe(rb_next_postorder(&pos->field), \ + typeof(*pos), field); 1; }); \ + pos = n) /* * Handy for checking that we are not deleting an entry that is diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 1f97ffb..8b3608c 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -290,15 +290,12 @@ size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp) void symbols__delete(struct rb_root *symbols) { - struct symbol *pos; - struct rb_node *next = rb_first(symbols); + struct symbol *pos, *next; - while (next) { - pos = rb_entry(next, struct symbol, rb_node); - next = rb_next(&pos->rb_node); - rb_erase(&pos->rb_node, symbols); + rbtree_postorder_for_each_entry_safe(pos, next, symbols, rb_node) symbol__delete(pos); - } + + *symbols = RB_ROOT; } void symbols__insert(struct rb_root *symbols, struct symbol *sym) -- 2.1.4
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