The most common case for certain node_random usage (demotion nodemask) is with
nodemask weight 1. We can avoid calling get_random_init() in that case and
always return the only node set in the nodemask.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
---
lib/nodemask.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/lib/nodemask.c b/lib/nodemask.c
index e22647f5181b..c91a6b0404a5 100644
--- a/lib/nodemask.c
+++ b/lib/nodemask.c
@@ -20,12 +20,21 @@ EXPORT_SYMBOL(__next_node_in);
*/
int node_random(const nodemask_t *maskp)
{
- int w, bit = NUMA_NO_NODE;
+ int w, bit;
w = nodes_weight(*maskp);
- if (w)
+ switch (w) {
+ case 0:
+ bit = NUMA_NO_NODE;
+ break;
+ case 1:
+ bit = __first_node(maskp);
+ break;
+ default:
bit = bitmap_ord_to_pos(maskp->bits,
- get_random_int() % w, MAX_NUMNODES);
+ get_random_int() % w, MAX_NUMNODES);
+ break;
+ }
return bit;
}
#endif
--
2.37.1
