P-FP: Don't double-account overheads under DPCP

Don't measure LOCK/UNLOCK while the scheduler is invoked.

1 files changed, 8 insertions, 0 deletions

diff --git a/litmus/sched_pfp.c b/litmus/sched_pfp.c
index 4b14a3eedb83..4d8759209a56 100644
--- a/litmus/sched_pfp.c
+++ b/litmus/sched_pfp.c
@@ -1223,6 +1223,11 @@ static void pfp_migrate_to(int target_cpu)
 
         raw_spin_unlock(&from->slock);
 
+        /* Don't trace scheduler costs as part of
+         * locking overhead. Scheduling costs are accounted for
+         * explicitly. */
+        TS_LOCK_SUSPEND;
+
         local_irq_enable();
         preempt_enable_no_resched();
 
@@ -1232,6 +1237,9 @@ static void pfp_migrate_to(int target_cpu)
         /* we are now on the target processor */
         preempt_disable();
 
+        /* start recording costs again */
+        TS_LOCK_RESUME;
+
         BUG_ON(smp_processor_id() != target_cpu);
 }