__rmqueue() is called by rmqueue_bulk() and rmqueue() under zone->lock
and that lock can be heavily contended with memory intensive applications.
Since __rmqueue() is a small function, inline it can save us some time.
With the will-it-scale/page_fault1/process benchmark, when using nr_cpu
processes to stress buddy:
On a 2 sockets Intel-Skylake machine:
base %change head
77342 +6.3% 82203 will-it-scale.per_process_ops
On a 4 sockets Intel-Skylake machine:
base %change head
75746 +4.6% 79248 will-it-scale.per_process_ops
This patch adds inline to __rmqueue().
Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0e309ce4a44a..c9605c7ebaf6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2291,7 +2291,7 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
* Do the hard work of removing an element from the buddy allocator.
* Call me with the zone->lock already held.
*/
-static struct page *__rmqueue(struct zone *zone, unsigned int order,
+static inline struct page *__rmqueue(struct zone *zone, unsigned int order,
int migratetype)
{
struct page *page;
--
2.13.6
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