MINOR: task: align the rq and wq locks
We really don't want them to share the same cache line as they are
expected to be used in parallel. Adding a 64-byte alignment here shows
a performance increase of about 4.5% on task-intensive workloads with
2 to 4 threads.
diff --git a/src/task.c b/src/task.c
index fbaaece..053376c 100644
--- a/src/task.c
+++ b/src/task.c
@@ -40,8 +40,8 @@
THREAD_LOCAL struct task *curr_task = NULL; /* task currently running or NULL */
-__decl_hathreads(HA_SPINLOCK_T rq_lock); /* spin lock related to run queue */
-__decl_hathreads(HA_SPINLOCK_T wq_lock); /* spin lock related to wait queue */
+__decl_hathreads(HA_SPINLOCK_T __attribute__((aligned(64))) rq_lock); /* spin lock related to run queue */
+__decl_hathreads(HA_SPINLOCK_T __attribute__((aligned(64))) wq_lock); /* spin lock related to wait queue */
static struct eb_root timers; /* sorted timers tree */
static struct eb_root rqueue; /* tree constituting the run queue */