Currently, only get jiffies once as the runstart time for all RCU
Tasks testing. it's not accurate, for each RCU Tasks type test, since
corresponding type of synchronize_rcu_tasks*() be invoked, so before
each RCU Tasks test starts, we need to wait for the grace period of
the previous RCU Tasks test to end, there will be a deviation in the
start time of the RCU Tasks test.
Therefore, this commit at the start of each RCU Tasks test, re-fetch the
jiffies time as the runstart time.
Signed-off-by: Zqiang <qiang1.zhang@xxxxxxxxx>
---
kernel/rcu/tasks.h | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index b0b885e071fa..4a991311be9b 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1813,23 +1813,21 @@ static void test_rcu_tasks_callback(struct rcu_head *rhp)
static void rcu_tasks_initiate_self_tests(void)
{
- unsigned long j = jiffies;
-
pr_info("Running RCU-tasks wait API self tests\n");
#ifdef CONFIG_TASKS_RCU
- tests[0].runstart = j;
+ tests[0].runstart = jiffies;
synchronize_rcu_tasks();
call_rcu_tasks(&tests[0].rh, test_rcu_tasks_callback);
#endif
#ifdef CONFIG_TASKS_RUDE_RCU
- tests[1].runstart = j;
+ tests[1].runstart = jiffies;
synchronize_rcu_tasks_rude();
call_rcu_tasks_rude(&tests[1].rh, test_rcu_tasks_callback);
#endif
#ifdef CONFIG_TASKS_TRACE_RCU
- tests[2].runstart = j;
+ tests[2].runstart = jiffies;
synchronize_rcu_tasks_trace();
call_rcu_tasks_trace(&tests[2].rh, test_rcu_tasks_callback);
#endif
--
2.25.1
