@@ -466,6 +466,11 @@ static inline int num_node_state(enum node_states state)
return nodes_weight(node_states[state]);
}
+static inline int num_node_state_eq(enum node_states state, int num)
+{
+ return nodes_weight_eq(node_states[state], num);
+}
+
#define for_each_node_state(__node, __state) \
for_each_node_mask((__node), node_states[__state])
@@ -8328,7 +8328,7 @@ void __init page_alloc_init(void)
int ret;
#ifdef CONFIG_NUMA
- if (num_node_state(N_MEMORY) == 1)
+ if (num_node_state_eq(N_MEMORY, 1))
hashdist = 0;
#endif
Kernel code uses num_node_state() to compare number of nodes with a given number. The underlying code calls bitmap_weight(), and we can do it more efficiently with num_node_state_eq because conditional nodes_weight may stop traversing the nodemask earlier, as soon as condition is met. Signed-off-by: Yury Norov <yury.norov@gmail.com> --- include/linux/nodemask.h | 5 +++++ mm/page_alloc.c | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-)