lib: list_sort.c: Limit number of unused cmp callbacks
The helper merge_and_restore_back_links() makes sure to call the
caller's cmp function during the final ->prev pointer fixup, so that the
cmp function may call cond_resched(). However, if the cmp function does
not call cond_resched() at all, this is entirely redundant. If it does,
doing at least two function calls for every two pointer assignments is a
bit excessive. This patch limits the calls to once for every 256
iterations.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Don Mullis <don.mullis@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/list_sort.c b/lib/list_sort.c
index a34c78c..6b9fdaf 100644
--- a/lib/list_sort.c
+++ b/lib/list_sort.c
@@ -47,6 +47,7 @@
struct list_head *a, struct list_head *b)
{
struct list_head *tail = head;
+ u8 count = 0;
while (a && b) {
/* if equal, take 'a' -- important for sort stability */
@@ -70,7 +71,8 @@
* element comparison is needed, so the client's cmp()
* routine can invoke cond_resched() periodically.
*/
- (*cmp)(priv, tail->next, tail->next);
+ if (unlikely(!(++count)))
+ (*cmp)(priv, tail->next, tail->next);
tail->next->prev = tail;
tail = tail->next;