diff options
Diffstat (limited to 'kernel/locking')
| -rw-r--r-- | kernel/locking/qspinlock.c | 14 | ||||
| -rw-r--r-- | kernel/locking/qspinlock_paravirt.h | 7 | ||||
| -rw-r--r-- | kernel/locking/qspinlock_stat.h | 9 |
3 files changed, 18 insertions, 12 deletions
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 46813185957b..bfaeb05123ff 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -12,11 +12,11 @@ * GNU General Public License for more details. * * (C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P. - * (C) Copyright 2013-2014 Red Hat, Inc. + * (C) Copyright 2013-2014,2018 Red Hat, Inc. * (C) Copyright 2015 Intel Corp. * (C) Copyright 2015 Hewlett-Packard Enterprise Development LP * - * Authors: Waiman Long <waiman.long@hpe.com> + * Authors: Waiman Long <longman@redhat.com> * Peter Zijlstra <peterz@infradead.org> */ @@ -33,6 +33,11 @@ #include <asm/qspinlock.h> /* + * Include queued spinlock statistics code + */ +#include "qspinlock_stat.h" + +/* * The basic principle of a queue-based spinlock can best be understood * by studying a classic queue-based spinlock implementation called the * MCS lock. The paper below provides a good description for this kind @@ -295,7 +300,7 @@ void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val) BUILD_BUG_ON(CONFIG_NR_CPUS >= (1U << _Q_TAIL_CPU_BITS)); if (pv_enabled()) - goto queue; + goto pv_queue; if (virt_spin_lock(lock)) return; @@ -348,6 +353,7 @@ void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val) * *,1,0 -> *,0,1 */ clear_pending_set_locked(lock); + qstat_inc(qstat_lock_pending, true); return; } @@ -363,6 +369,8 @@ void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val) * queuing. */ queue: + qstat_inc(qstat_lock_slowpath, true); +pv_queue: node = this_cpu_ptr(&mcs_nodes[0]); idx = node->count++; tail = encode_tail(smp_processor_id(), idx); diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h index 2dbad2f25480..25730b2ac022 100644 --- a/kernel/locking/qspinlock_paravirt.h +++ b/kernel/locking/qspinlock_paravirt.h @@ -56,11 +56,6 @@ struct pv_node { }; /* - * Include queued spinlock statistics code - */ -#include "qspinlock_stat.h" - -/* * Hybrid PV queued/unfair lock * * By replacing the regular queued_spin_trylock() with the function below, @@ -428,7 +423,7 @@ pv_wait_head_or_lock(struct qspinlock *lock, struct mcs_spinlock *node) /* * Tracking # of slowpath locking operations */ - qstat_inc(qstat_pv_lock_slowpath, true); + qstat_inc(qstat_lock_slowpath, true); for (;; waitcnt++) { /* diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h index 4a30ef63c607..6bd78c0740fc 100644 --- a/kernel/locking/qspinlock_stat.h +++ b/kernel/locking/qspinlock_stat.h @@ -22,13 +22,14 @@ * pv_kick_wake - # of vCPU kicks used for computing pv_latency_wake * pv_latency_kick - average latency (ns) of vCPU kick operation * pv_latency_wake - average latency (ns) from vCPU kick to wakeup - * pv_lock_slowpath - # of locking operations via the slowpath * pv_lock_stealing - # of lock stealing operations * pv_spurious_wakeup - # of spurious wakeups in non-head vCPUs * pv_wait_again - # of wait's after a queue head vCPU kick * pv_wait_early - # of early vCPU wait's * pv_wait_head - # of vCPU wait's at the queue head * pv_wait_node - # of vCPU wait's at a non-head queue node + * lock_pending - # of locking operations via pending code + * lock_slowpath - # of locking operations via MCS lock queue * * Writing to the "reset_counters" file will reset all the above counter * values. @@ -46,13 +47,14 @@ enum qlock_stats { qstat_pv_kick_wake, qstat_pv_latency_kick, qstat_pv_latency_wake, - qstat_pv_lock_slowpath, qstat_pv_lock_stealing, qstat_pv_spurious_wakeup, qstat_pv_wait_again, qstat_pv_wait_early, qstat_pv_wait_head, qstat_pv_wait_node, + qstat_lock_pending, + qstat_lock_slowpath, qstat_num, /* Total number of statistical counters */ qstat_reset_cnts = qstat_num, }; @@ -73,12 +75,13 @@ static const char * const qstat_names[qstat_num + 1] = { [qstat_pv_spurious_wakeup] = "pv_spurious_wakeup", [qstat_pv_latency_kick] = "pv_latency_kick", [qstat_pv_latency_wake] = "pv_latency_wake", - [qstat_pv_lock_slowpath] = "pv_lock_slowpath", [qstat_pv_lock_stealing] = "pv_lock_stealing", [qstat_pv_wait_again] = "pv_wait_again", [qstat_pv_wait_early] = "pv_wait_early", [qstat_pv_wait_head] = "pv_wait_head", [qstat_pv_wait_node] = "pv_wait_node", + [qstat_lock_pending] = "lock_pending", + [qstat_lock_slowpath] = "lock_slowpath", [qstat_reset_cnts] = "reset_counters", }; |