* [PATCH tip/locking/core 1/3] locking/qspinlock: Use smp_cond_acquire() in pending code
@ 2015-12-10 20:17 Waiman Long
2015-12-10 20:17 ` [PATCH tip/locking/core 2/3] locking/pvqspinlock: Enable slowpath locking count tracking Waiman Long
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Waiman Long @ 2015-12-10 20:17 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar
Cc: linux-kernel, Scott J Norton, Douglas Hatch, Waiman Long
The newly introduced smp_cond_acquire() was used to replace the
slowpath lock acquisition loop. Similarly, the new function can also
be applied to the pending bit locking loop. This patch uses the new
function in that loop.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
---
kernel/locking/qspinlock.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c
index 393d187..ce2f75e 100644
--- a/kernel/locking/qspinlock.c
+++ b/kernel/locking/qspinlock.c
@@ -358,8 +358,7 @@ void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val)
* sequentiality; this is because not all clear_pending_set_locked()
* implementations imply full barriers.
*/
- while ((val = smp_load_acquire(&lock->val.counter)) & _Q_LOCKED_MASK)
- cpu_relax();
+ smp_cond_acquire(!(atomic_read(&lock->val) & _Q_LOCKED_MASK));
/*
* take ownership and clear the pending bit.
@@ -435,7 +434,7 @@ queue:
*
* The PV pv_wait_head_or_lock function, if active, will acquire
* the lock and return a non-zero value. So we have to skip the
- * smp_load_acquire() call. As the next PV queue head hasn't been
+ * smp_cond_acquire() call. As the next PV queue head hasn't been
* designated yet, there is no way for the locked value to become
* _Q_SLOW_VAL. So both the set_locked() and the
* atomic_cmpxchg_relaxed() calls will be safe.
@@ -466,7 +465,7 @@ locked:
break;
}
/*
- * The smp_load_acquire() call above has provided the necessary
+ * The smp_cond_acquire() call above has provided the necessary
* acquire semantics required for locking. At most two
* iterations of this loop may be ran.
*/
--
1.7.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH tip/locking/core 2/3] locking/pvqspinlock: Enable slowpath locking count tracking
2015-12-10 20:17 [PATCH tip/locking/core 1/3] locking/qspinlock: Use smp_cond_acquire() in pending code Waiman Long
@ 2015-12-10 20:17 ` Waiman Long
2016-02-29 11:21 ` [tip:locking/core] " tip-bot for Waiman Long
2015-12-10 20:17 ` [PATCH tip/locking/core 3/3] locking/pvqspinlock: Direct lock stealing count tracking in pv_queued_spin_steal_lock Waiman Long
2016-02-29 11:20 ` [tip:locking/core] locking/qspinlock: Use smp_cond_acquire() in pending code tip-bot for Waiman Long
2 siblings, 1 reply; 6+ messages in thread
From: Waiman Long @ 2015-12-10 20:17 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar
Cc: linux-kernel, Scott J Norton, Douglas Hatch, Waiman Long
This patch enables the tracking of the number of slowpath locking
operations performed. This can be used to compare against the number
of lock stealing operations to see what percentage of locks are stolen
versus acquired via the regular slowpath.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
---
kernel/locking/qspinlock_paravirt.h | 5 +++++
kernel/locking/qspinlock_stat.h | 3 +++
2 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h
index 87bb235..72cec9e 100644
--- a/kernel/locking/qspinlock_paravirt.h
+++ b/kernel/locking/qspinlock_paravirt.h
@@ -398,6 +398,11 @@ pv_wait_head_or_lock(struct qspinlock *lock, struct mcs_spinlock *node)
if (READ_ONCE(pn->state) == vcpu_hashed)
lp = (struct qspinlock **)1;
+ /*
+ * Tracking # of slowpath locking operations
+ */
+ qstat_inc(qstat_pv_lock_slowpath, true);
+
for (;; waitcnt++) {
/*
* Set correct vCPU state to be used by queue node wait-early
diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h
index 640dcec..283a615 100644
--- a/kernel/locking/qspinlock_stat.h
+++ b/kernel/locking/qspinlock_stat.h
@@ -22,6 +22,7 @@
* 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
* pv_wait_again - # of vCPU wait's that happened after a vCPU kick
@@ -45,6 +46,7 @@ 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,
@@ -70,6 +72,7 @@ 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",
--
1.7.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH tip/locking/core 3/3] locking/pvqspinlock: Direct lock stealing count tracking in pv_queued_spin_steal_lock
2015-12-10 20:17 [PATCH tip/locking/core 1/3] locking/qspinlock: Use smp_cond_acquire() in pending code Waiman Long
2015-12-10 20:17 ` [PATCH tip/locking/core 2/3] locking/pvqspinlock: Enable slowpath locking count tracking Waiman Long
@ 2015-12-10 20:17 ` Waiman Long
2016-02-29 11:20 ` [tip:locking/core] locking/pvqspinlock: Move lock stealing count tracking code into pv_queued_spin_steal_lock() tip-bot for Waiman Long
2016-02-29 11:20 ` [tip:locking/core] locking/qspinlock: Use smp_cond_acquire() in pending code tip-bot for Waiman Long
2 siblings, 1 reply; 6+ messages in thread
From: Waiman Long @ 2015-12-10 20:17 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar
Cc: linux-kernel, Scott J Norton, Douglas Hatch, Waiman Long
This patch moves the lock stealing count tracking code into
pv_queued_spin_steal_lock instead of via a jacket function simplifying
the code.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
---
kernel/locking/qspinlock_paravirt.h | 16 +++++++++-------
kernel/locking/qspinlock_stat.h | 13 -------------
2 files changed, 9 insertions(+), 20 deletions(-)
diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h
index 72cec9e..21ede57 100644
--- a/kernel/locking/qspinlock_paravirt.h
+++ b/kernel/locking/qspinlock_paravirt.h
@@ -55,6 +55,11 @@ struct pv_node {
};
/*
+ * Include queued spinlock statistics code
+ */
+#include "qspinlock_stat.h"
+
+/*
* By replacing the regular queued_spin_trylock() with the function below,
* it will be called once when a lock waiter enter the PV slowpath before
* being queued. By allowing one lock stealing attempt here when the pending
@@ -65,9 +70,11 @@ struct pv_node {
static inline bool pv_queued_spin_steal_lock(struct qspinlock *lock)
{
struct __qspinlock *l = (void *)lock;
+ int ret = !(atomic_read(&lock->val) & _Q_LOCKED_PENDING_MASK) &&
+ (cmpxchg(&l->locked, 0, _Q_LOCKED_VAL) == 0);
- return !(atomic_read(&lock->val) & _Q_LOCKED_PENDING_MASK) &&
- (cmpxchg(&l->locked, 0, _Q_LOCKED_VAL) == 0);
+ qstat_inc(qstat_pv_lock_stealing, ret);
+ return ret;
}
/*
@@ -138,11 +145,6 @@ static __always_inline int trylock_clear_pending(struct qspinlock *lock)
#endif /* _Q_PENDING_BITS == 8 */
/*
- * Include queued spinlock statistics code
- */
-#include "qspinlock_stat.h"
-
-/*
* Lock and MCS node addresses hash table for fast lookup
*
* Hashing is done on a per-cacheline basis to minimize the need to access
diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h
index 283a615..eb2a2c9 100644
--- a/kernel/locking/qspinlock_stat.h
+++ b/kernel/locking/qspinlock_stat.h
@@ -282,19 +282,6 @@ static inline void __pv_wait(u8 *ptr, u8 val)
#define pv_kick(c) __pv_kick(c)
#define pv_wait(p, v) __pv_wait(p, v)
-/*
- * PV unfair trylock count tracking function
- */
-static inline int qstat_spin_steal_lock(struct qspinlock *lock)
-{
- int ret = pv_queued_spin_steal_lock(lock);
-
- qstat_inc(qstat_pv_lock_stealing, ret);
- return ret;
-}
-#undef queued_spin_trylock
-#define queued_spin_trylock(l) qstat_spin_steal_lock(l)
-
#else /* CONFIG_QUEUED_LOCK_STAT */
static inline void qstat_inc(enum qlock_stats stat, bool cond) { }
--
1.7.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [tip:locking/core] locking/pvqspinlock: Move lock stealing count tracking code into pv_queued_spin_steal_lock()
2015-12-10 20:17 ` [PATCH tip/locking/core 3/3] locking/pvqspinlock: Direct lock stealing count tracking in pv_queued_spin_steal_lock Waiman Long
@ 2016-02-29 11:20 ` tip-bot for Waiman Long
0 siblings, 0 replies; 6+ messages in thread
From: tip-bot for Waiman Long @ 2016-02-29 11:20 UTC (permalink / raw)
To: linux-tip-commits
Cc: akpm, paulmck, hpa, peterz, scott.norton, mingo, torvalds, tglx,
linux-kernel, doug.hatch, Waiman.Long
Commit-ID: eaff0e7003cca6c2748b67ead2d4b1a8ad858fc7
Gitweb: http://git.kernel.org/tip/eaff0e7003cca6c2748b67ead2d4b1a8ad858fc7
Author: Waiman Long <Waiman.Long@hpe.com>
AuthorDate: Thu, 10 Dec 2015 15:17:46 -0500
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 29 Feb 2016 10:02:41 +0100
locking/pvqspinlock: Move lock stealing count tracking code into pv_queued_spin_steal_lock()
This patch moves the lock stealing count tracking code into
pv_queued_spin_steal_lock() instead of via a jacket function simplifying
the code.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Douglas Hatch <doug.hatch@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Scott J Norton <scott.norton@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1449778666-13593-3-git-send-email-Waiman.Long@hpe.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/qspinlock_paravirt.h | 16 +++++++++-------
kernel/locking/qspinlock_stat.h | 13 -------------
2 files changed, 9 insertions(+), 20 deletions(-)
diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h
index 87bb235..78f04a2 100644
--- a/kernel/locking/qspinlock_paravirt.h
+++ b/kernel/locking/qspinlock_paravirt.h
@@ -55,6 +55,11 @@ struct pv_node {
};
/*
+ * Include queued spinlock statistics code
+ */
+#include "qspinlock_stat.h"
+
+/*
* By replacing the regular queued_spin_trylock() with the function below,
* it will be called once when a lock waiter enter the PV slowpath before
* being queued. By allowing one lock stealing attempt here when the pending
@@ -65,9 +70,11 @@ struct pv_node {
static inline bool pv_queued_spin_steal_lock(struct qspinlock *lock)
{
struct __qspinlock *l = (void *)lock;
+ int ret = !(atomic_read(&lock->val) & _Q_LOCKED_PENDING_MASK) &&
+ (cmpxchg(&l->locked, 0, _Q_LOCKED_VAL) == 0);
- return !(atomic_read(&lock->val) & _Q_LOCKED_PENDING_MASK) &&
- (cmpxchg(&l->locked, 0, _Q_LOCKED_VAL) == 0);
+ qstat_inc(qstat_pv_lock_stealing, ret);
+ return ret;
}
/*
@@ -138,11 +145,6 @@ static __always_inline int trylock_clear_pending(struct qspinlock *lock)
#endif /* _Q_PENDING_BITS == 8 */
/*
- * Include queued spinlock statistics code
- */
-#include "qspinlock_stat.h"
-
-/*
* Lock and MCS node addresses hash table for fast lookup
*
* Hashing is done on a per-cacheline basis to minimize the need to access
diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h
index 640dcec..869988d 100644
--- a/kernel/locking/qspinlock_stat.h
+++ b/kernel/locking/qspinlock_stat.h
@@ -279,19 +279,6 @@ static inline void __pv_wait(u8 *ptr, u8 val)
#define pv_kick(c) __pv_kick(c)
#define pv_wait(p, v) __pv_wait(p, v)
-/*
- * PV unfair trylock count tracking function
- */
-static inline int qstat_spin_steal_lock(struct qspinlock *lock)
-{
- int ret = pv_queued_spin_steal_lock(lock);
-
- qstat_inc(qstat_pv_lock_stealing, ret);
- return ret;
-}
-#undef queued_spin_trylock
-#define queued_spin_trylock(l) qstat_spin_steal_lock(l)
-
#else /* CONFIG_QUEUED_LOCK_STAT */
static inline void qstat_inc(enum qlock_stats stat, bool cond) { }
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [tip:locking/core] locking/qspinlock: Use smp_cond_acquire() in pending code
2015-12-10 20:17 [PATCH tip/locking/core 1/3] locking/qspinlock: Use smp_cond_acquire() in pending code Waiman Long
2015-12-10 20:17 ` [PATCH tip/locking/core 2/3] locking/pvqspinlock: Enable slowpath locking count tracking Waiman Long
2015-12-10 20:17 ` [PATCH tip/locking/core 3/3] locking/pvqspinlock: Direct lock stealing count tracking in pv_queued_spin_steal_lock Waiman Long
@ 2016-02-29 11:20 ` tip-bot for Waiman Long
2 siblings, 0 replies; 6+ messages in thread
From: tip-bot for Waiman Long @ 2016-02-29 11:20 UTC (permalink / raw)
To: linux-tip-commits
Cc: scott.norton, akpm, hpa, torvalds, peterz, doug.hatch,
Waiman.Long, paulmck, linux-kernel, mingo, tglx
Commit-ID: cb037fdad6772df2d49fe61c97d7c0d8265bc918
Gitweb: http://git.kernel.org/tip/cb037fdad6772df2d49fe61c97d7c0d8265bc918
Author: Waiman Long <Waiman.Long@hpe.com>
AuthorDate: Thu, 10 Dec 2015 15:17:44 -0500
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 29 Feb 2016 10:02:42 +0100
locking/qspinlock: Use smp_cond_acquire() in pending code
The newly introduced smp_cond_acquire() was used to replace the
slowpath lock acquisition loop. Similarly, the new function can also
be applied to the pending bit locking loop. This patch uses the new
function in that loop.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Douglas Hatch <doug.hatch@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Scott J Norton <scott.norton@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1449778666-13593-1-git-send-email-Waiman.Long@hpe.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/qspinlock.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c
index 393d187..ce2f75e 100644
--- a/kernel/locking/qspinlock.c
+++ b/kernel/locking/qspinlock.c
@@ -358,8 +358,7 @@ void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val)
* sequentiality; this is because not all clear_pending_set_locked()
* implementations imply full barriers.
*/
- while ((val = smp_load_acquire(&lock->val.counter)) & _Q_LOCKED_MASK)
- cpu_relax();
+ smp_cond_acquire(!(atomic_read(&lock->val) & _Q_LOCKED_MASK));
/*
* take ownership and clear the pending bit.
@@ -435,7 +434,7 @@ queue:
*
* The PV pv_wait_head_or_lock function, if active, will acquire
* the lock and return a non-zero value. So we have to skip the
- * smp_load_acquire() call. As the next PV queue head hasn't been
+ * smp_cond_acquire() call. As the next PV queue head hasn't been
* designated yet, there is no way for the locked value to become
* _Q_SLOW_VAL. So both the set_locked() and the
* atomic_cmpxchg_relaxed() calls will be safe.
@@ -466,7 +465,7 @@ locked:
break;
}
/*
- * The smp_load_acquire() call above has provided the necessary
+ * The smp_cond_acquire() call above has provided the necessary
* acquire semantics required for locking. At most two
* iterations of this loop may be ran.
*/
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [tip:locking/core] locking/pvqspinlock: Enable slowpath locking count tracking
2015-12-10 20:17 ` [PATCH tip/locking/core 2/3] locking/pvqspinlock: Enable slowpath locking count tracking Waiman Long
@ 2016-02-29 11:21 ` tip-bot for Waiman Long
0 siblings, 0 replies; 6+ messages in thread
From: tip-bot for Waiman Long @ 2016-02-29 11:21 UTC (permalink / raw)
To: linux-tip-commits
Cc: akpm, scott.norton, Waiman.Long, paulmck, hpa, tglx, mingo,
linux-kernel, doug.hatch, torvalds, peterz
Commit-ID: 32d62510f949d3c8e83b9b3b844a84446611661b
Gitweb: http://git.kernel.org/tip/32d62510f949d3c8e83b9b3b844a84446611661b
Author: Waiman Long <Waiman.Long@hpe.com>
AuthorDate: Thu, 10 Dec 2015 15:17:45 -0500
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 29 Feb 2016 10:02:42 +0100
locking/pvqspinlock: Enable slowpath locking count tracking
This patch enables the tracking of the number of slowpath locking
operations performed. This can be used to compare against the number
of lock stealing operations to see what percentage of locks are stolen
versus acquired via the regular slowpath.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Douglas Hatch <doug.hatch@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Scott J Norton <scott.norton@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1449778666-13593-2-git-send-email-Waiman.Long@hpe.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/qspinlock_paravirt.h | 5 +++++
kernel/locking/qspinlock_stat.h | 3 +++
2 files changed, 8 insertions(+)
diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h
index 78f04a2..21ede57 100644
--- a/kernel/locking/qspinlock_paravirt.h
+++ b/kernel/locking/qspinlock_paravirt.h
@@ -400,6 +400,11 @@ pv_wait_head_or_lock(struct qspinlock *lock, struct mcs_spinlock *node)
if (READ_ONCE(pn->state) == vcpu_hashed)
lp = (struct qspinlock **)1;
+ /*
+ * Tracking # of slowpath locking operations
+ */
+ qstat_inc(qstat_pv_lock_slowpath, true);
+
for (;; waitcnt++) {
/*
* Set correct vCPU state to be used by queue node wait-early
diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h
index 869988d..eb2a2c9 100644
--- a/kernel/locking/qspinlock_stat.h
+++ b/kernel/locking/qspinlock_stat.h
@@ -22,6 +22,7 @@
* 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
* pv_wait_again - # of vCPU wait's that happened after a vCPU kick
@@ -45,6 +46,7 @@ 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,
@@ -70,6 +72,7 @@ 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",
^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2016-02-29 11:22 UTC | newest]
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2015-12-10 20:17 [PATCH tip/locking/core 1/3] locking/qspinlock: Use smp_cond_acquire() in pending code Waiman Long
2015-12-10 20:17 ` [PATCH tip/locking/core 2/3] locking/pvqspinlock: Enable slowpath locking count tracking Waiman Long
2016-02-29 11:21 ` [tip:locking/core] " tip-bot for Waiman Long
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2016-02-29 11:20 ` [tip:locking/core] locking/pvqspinlock: Move lock stealing count tracking code into pv_queued_spin_steal_lock() tip-bot for Waiman Long
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