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rcu: Remove obsolete __rcu_pending() statistics for debugfs
The debugfs interface displayed statistics on RCU-pending checks but this interface has since been removed. This commit therefore removes the no-longer-used rcu_data structure's ->n_rcu_pending, ->n_rp_core_needs_qs, ->n_rp_report_qs, ->n_rp_cb_ready, ->n_rp_cpu_needs_gp, ->n_rp_gp_completed, ->n_rp_gp_started, ->n_rp_nocb_defer_wakeup, and ->n_rp_need_nothing fields along with their updates. If this information proves necessary in the future, the corresponding event traces will be added. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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parent
62df63e048
commit
01c495f72a
2 changed files with 9 additions and 39 deletions
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@ -3354,8 +3354,6 @@ static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
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{
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struct rcu_node *rnp = rdp->mynode;
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rdp->n_rcu_pending++;
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/* Check for CPU stalls, if enabled. */
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check_cpu_stall(rsp, rdp);
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@ -3364,48 +3362,31 @@ static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
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return 0;
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/* Is the RCU core waiting for a quiescent state from this CPU? */
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if (rcu_scheduler_fully_active &&
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rdp->core_needs_qs && rdp->cpu_no_qs.b.norm &&
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rdp->rcu_qs_ctr_snap == __this_cpu_read(rcu_dynticks.rcu_qs_ctr)) {
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rdp->n_rp_core_needs_qs++;
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} else if (rdp->core_needs_qs && !rdp->cpu_no_qs.b.norm) {
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rdp->n_rp_report_qs++;
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if (rdp->core_needs_qs && !rdp->cpu_no_qs.b.norm)
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return 1;
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}
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/* Does this CPU have callbacks ready to invoke? */
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if (rcu_segcblist_ready_cbs(&rdp->cblist)) {
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rdp->n_rp_cb_ready++;
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if (rcu_segcblist_ready_cbs(&rdp->cblist))
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return 1;
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}
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/* Has RCU gone idle with this CPU needing another grace period? */
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if (cpu_needs_another_gp(rsp, rdp)) {
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rdp->n_rp_cpu_needs_gp++;
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if (cpu_needs_another_gp(rsp, rdp))
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return 1;
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}
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/* Has another RCU grace period completed? */
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if (READ_ONCE(rnp->completed) != rdp->completed) { /* outside lock */
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rdp->n_rp_gp_completed++;
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if (READ_ONCE(rnp->completed) != rdp->completed) /* outside lock */
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return 1;
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}
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/* Has a new RCU grace period started? */
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if (READ_ONCE(rnp->gpnum) != rdp->gpnum ||
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unlikely(READ_ONCE(rdp->gpwrap))) { /* outside lock */
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rdp->n_rp_gp_started++;
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unlikely(READ_ONCE(rdp->gpwrap))) /* outside lock */
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return 1;
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}
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/* Does this CPU need a deferred NOCB wakeup? */
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if (rcu_nocb_need_deferred_wakeup(rdp)) {
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rdp->n_rp_nocb_defer_wakeup++;
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if (rcu_nocb_need_deferred_wakeup(rdp))
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return 1;
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}
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/* nothing to do */
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rdp->n_rp_need_nothing++;
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return 0;
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}
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@ -226,18 +226,7 @@ struct rcu_data {
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/* Grace period that needs help */
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/* from cond_resched(). */
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/* 5) __rcu_pending() statistics. */
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unsigned long n_rcu_pending; /* rcu_pending() calls since boot. */
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unsigned long n_rp_core_needs_qs;
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unsigned long n_rp_report_qs;
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unsigned long n_rp_cb_ready;
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unsigned long n_rp_cpu_needs_gp;
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unsigned long n_rp_gp_completed;
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unsigned long n_rp_gp_started;
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unsigned long n_rp_nocb_defer_wakeup;
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unsigned long n_rp_need_nothing;
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/* 6) _rcu_barrier(), OOM callbacks, and expediting. */
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/* 5) _rcu_barrier(), OOM callbacks, and expediting. */
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struct rcu_head barrier_head;
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#ifdef CONFIG_RCU_FAST_NO_HZ
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struct rcu_head oom_head;
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@ -248,7 +237,7 @@ struct rcu_data {
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atomic_long_t exp_workdone3; /* # done by others #3. */
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int exp_dynticks_snap; /* Double-check need for IPI. */
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/* 7) Callback offloading. */
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/* 6) Callback offloading. */
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#ifdef CONFIG_RCU_NOCB_CPU
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struct rcu_head *nocb_head; /* CBs waiting for kthread. */
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struct rcu_head **nocb_tail;
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@ -275,7 +264,7 @@ struct rcu_data {
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/* Leader CPU takes GP-end wakeups. */
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#endif /* #ifdef CONFIG_RCU_NOCB_CPU */
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/* 8) RCU CPU stall data. */
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/* 7) RCU CPU stall data. */
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unsigned int softirq_snap; /* Snapshot of softirq activity. */
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/* ->rcu_iw* fields protected by leaf rcu_node ->lock. */
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struct irq_work rcu_iw; /* Check for non-irq activity. */
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