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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-01-10 13:10:49 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-02-20 16:10:29 -0800 |
| commit | d62df57370a5215fbf1b088d2ee51fa5d69bd0c3 (patch) | |
| tree | eb82cd3110367c69a8ae4edf58febe1891c91e56 /kernel/rcu | |
| parent | 01c495f72a3b5a210e5689deba1ef33c82e8aa30 (diff) | |
| download | linux-d62df57370a5215fbf1b088d2ee51fa5d69bd0c3.tar.gz linux-d62df57370a5215fbf1b088d2ee51fa5d69bd0c3.tar.xz | |
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@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 5 | ||||
| -rw-r--r-- | kernel/rcu/tree.h | 4 |
2 files changed, 1 insertions, 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 */ |