Commit-ID: d62df57370a5215fbf1b088d2ee51fa5d69bd0c3
Gitweb: https://git.kernel.org/tip/d62df57370a5215fbf1b088d2ee51fa5d69bd0c3
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 10 Jan 2018 13:10:49 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 20 Feb 2018 16:10:29 -0800
rcu: Remove obsolete force-quiescent-state 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_state structure's ->n_force_qs_lh and ->n_force_qs_ngp
fields along with their updates. (Though the ->n_force_qs_ngp field
was actually not used at all, embarrassingly enough.)
If this information proves necessary in the future, the corresponding
event traces will be added.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 5 +----
kernel/rcu/tree.h | 4 ----
2 files changed, 1 insertion(+), 8 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 99d59be761d1..86fc087c7777 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2844,10 +2844,8 @@ static void force_quiescent_state(struct rcu_state *rsp)
!raw_spin_trylock(&rnp->fqslock);
if (rnp_old != NULL)
raw_spin_unlock(&rnp_old->fqslock);
- if (ret) {
- rsp->n_force_qs_lh++;
+ if (ret)
return;
- }
rnp_old = rnp;
}
/* rnp_old == rcu_get_root(rsp), rnp == NULL. */
@@ -2856,7 +2854,6 @@ static void force_quiescent_state(struct rcu_state *rsp)
raw_spin_lock_irqsave_rcu_node(rnp_old, flags);
raw_spin_unlock(&rnp_old->fqslock);
if (READ_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) {
- rsp->n_force_qs_lh++;
raw_spin_unlock_irqrestore_rcu_node(rnp_old, flags);
return; /* Someone beat us to it. */
}
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index d29bab8dea28..2edd56397b00 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -355,10 +355,6 @@ struct rcu_state {
/* kthreads, if configured. */
unsigned long n_force_qs; /* Number of calls to */
/* force_quiescent_state(). */
- unsigned long n_force_qs_lh; /* ~Number of calls leaving */
- /* due to lock unavailable. */
- unsigned long n_force_qs_ngp; /* Number of calls leaving */
- /* due to no GP active. */
unsigned long gp_start; /* Time at which GP started, */
/* but in jiffies. */
unsigned long gp_activity; /* Time of last GP kthread */
--
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