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rcu: Update comments to reflect softirqs vs. kthreads 

We now have kthreads only for flavors of RCU that support boosting,
so update the now-misleading comments accordingly.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2011-06-21 01:29:39 -07:00 committed by Paul E. McKenney
parent 72fe701b70
commit e0f23060ad
2 changed files with 14 additions and 12 deletions
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23
kernel/rcutree.c
View File

@ -198,7 +198,7 @@ DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = {
};
#endif /* #ifdef CONFIG_NO_HZ */
static int blimit = 10; /* Maximum callbacks per softirq. */
static int blimit = 10; /* Maximum callbacks per rcu_do_batch. */
static int qhimark = 10000; /* If this many pending, ignore blimit. */
static int qlowmark = 100; /* Once only this many pending, use blimit. */
@ -1261,7 +1261,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
local_irq_restore(flags);
/* Re-raise the RCU softirq if there are callbacks remaining. */
/* Re-invoke RCU core processing if there are callbacks remaining. */
if (cpu_has_callbacks_ready_to_invoke(rdp))
invoke_rcu_core();
}
@ -1269,7 +1269,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
/*
* Check to see if this CPU is in a non-context-switch quiescent state
* (user mode or idle loop for rcu, non-softirq execution for rcu_bh).
* Also schedule the RCU softirq handler.
* Also schedule RCU core processing.
*
* This function must be called with hardirqs disabled. It is normally
* invoked from the scheduling-clock interrupt. If rcu_pending returns
@ -1448,9 +1448,9 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
#endif /* #else #ifdef CONFIG_SMP */
/*
* This does the RCU processing work from softirq context for the
* specified rcu_state and rcu_data structures. This may be called
* only from the CPU to whom the rdp belongs.
* This does the RCU core processing work for the specified rcu_state
* and rcu_data structures. This may be called only from the CPU to
* whom the rdp belongs.
*/
static void
__rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
@ -1487,7 +1487,7 @@ __rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
}
/*
* Do softirq processing for the current CPU.
* Do RCU core processing for the current CPU.
*/
static void rcu_process_callbacks(struct softirq_action *unused)
{
@ -1503,10 +1503,11 @@ static void rcu_process_callbacks(struct softirq_action *unused)
}
/*
* Wake up the current CPU's kthread. This replaces raise_softirq()
* in earlier versions of RCU. Note that because we are running on
* the current CPU with interrupts disabled, the rcu_cpu_kthread_task
* cannot disappear out from under us.
* Schedule RCU callback invocation. If the specified type of RCU
* does not support RCU priority boosting, just do a direct call,
* otherwise wake up the per-CPU kernel kthread. Note that because we
* are running on the current CPU with interrupts disabled, the
* rcu_cpu_kthread_task cannot disappear out from under us.
*/
static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
{

3
kernel/rcutree_plugin.h
View File

@ -1478,7 +1478,8 @@ static int rcu_cpu_kthread_should_stop(int cpu)
/*
* Per-CPU kernel thread that invokes RCU callbacks. This replaces the
* earlier RCU softirq.
* RCU softirq used in flavors and configurations of RCU that do not
* support RCU priority boosting.
*/
static int rcu_cpu_kthread(void *arg)
{