If cond_resched() returns false, then it has already invoked rcu_all_qs(). This is also invoked (now redundantly) by rcu_note_voluntary_context_switch(). This commit therefore changes cond_resched_rcu_qs() to invoke rcu_note_voluntary_context_switch_lite() instead of rcu_note_voluntary_context_switch() to avoid the redundant invocation of rcu_all_qs().
Signed-off-by: Paul E. McKenney <[email protected]> --- include/linux/rcupdate.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index a6ddc42f87a5..7bd8b5a6db10 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -197,7 +197,7 @@ static inline void exit_tasks_rcu_finish(void) { } #define cond_resched_rcu_qs() \ do { \ if (!cond_resched()) \ - rcu_note_voluntary_context_switch(current); \ + rcu_note_voluntary_context_switch_lite(current); \ } while (0) /* -- 2.5.2
