Grace-period initialization first processes any recent CPU-hotplug operations, and then initializes state for the new grace period. These two phases of initialization are currently not distinguished in debug prints, but the distinction is valuable in a number of debug situations. This commit therefore introduces two new values for ->gp_state, RCU_GP_ONOFF and RCU_GP_INIT, in order to make this distinction.
Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/rcu/tree.c | 2 ++ kernel/rcu/tree.h | 12 ++++++++---- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 1e87ff1154a5..9e83743ca9d9 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1891,6 +1891,7 @@ static bool rcu_gp_init(struct rcu_state *rsp) * for subsequent online CPUs, and that quiescent-state forcing * will handle subsequent offline CPUs. */ + rsp->gp_state = RCU_GP_ONOFF; rcu_for_each_leaf_node(rsp, rnp) { spin_lock(&rsp->ofl_lock); raw_spin_lock_irq_rcu_node(rnp); @@ -1950,6 +1951,7 @@ static bool rcu_gp_init(struct rcu_state *rsp) * The grace period cannot complete until the initialization * process finishes, because this kthread handles both. */ + rsp->gp_state = RCU_GP_INIT; rcu_for_each_node_breadth_first(rsp, rnp) { rcu_gp_slow(rsp, gp_init_delay); raw_spin_lock_irqsave_rcu_node(rnp, flags); diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index f52bc059bfec..8077aff7ab40 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -380,16 +380,20 @@ struct rcu_state { #define RCU_GP_IDLE 0 /* Initial state and no GP in progress. */ #define RCU_GP_WAIT_GPS 1 /* Wait for grace-period start. */ #define RCU_GP_DONE_GPS 2 /* Wait done for grace-period start. */ -#define RCU_GP_WAIT_FQS 3 /* Wait for force-quiescent-state time. */ -#define RCU_GP_DOING_FQS 4 /* Wait done for force-quiescent-state time. */ -#define RCU_GP_CLEANUP 5 /* Grace-period cleanup started. */ -#define RCU_GP_CLEANED 6 /* Grace-period cleanup complete. */ +#define RCU_GP_ONOFF 3 /* Grace-period initialization hotplug. */ +#define RCU_GP_INIT 4 /* Grace-period initialization. */ +#define RCU_GP_WAIT_FQS 5 /* Wait for force-quiescent-state time. */ +#define RCU_GP_DOING_FQS 6 /* Wait done for force-quiescent-state time. */ +#define RCU_GP_CLEANUP 7 /* Grace-period cleanup started. */ +#define RCU_GP_CLEANED 8 /* Grace-period cleanup complete. */ #ifndef RCU_TREE_NONCORE static const char * const gp_state_names[] = { "RCU_GP_IDLE", "RCU_GP_WAIT_GPS", "RCU_GP_DONE_GPS", + "RCU_GP_ONOFF", + "RCU_GP_INIT", "RCU_GP_WAIT_FQS", "RCU_GP_DOING_FQS", "RCU_GP_CLEANUP", -- 2.17.1
