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Message-Id: <20221123012104.3317665-3-joel@joelfernandes.org>
Date: Wed, 23 Nov 2022 01:21:03 +0000
From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
To: linux-kernel@...r.kernel.org
Cc: "Joel Fernandes (Google)" <joel@...lfernandes.org>,
Ben Segall <bsegall@...gle.com>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Davidlohr Bueso <dave@...olabs.net>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Ingo Molnar <mingo@...hat.com>,
Josh Triplett <josh@...htriplett.org>,
Juri Lelli <juri.lelli@...hat.com>,
Mel Gorman <mgorman@...e.de>,
"Paul E. McKenney" <paulmck@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Valentin Schneider <vschneid@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
kernel-team@...roid.com, John Stultz <jstultz@...gle.com>,
Joel Fernandes <joelaf@...gle.com>,
Qais Yousef <qais.yousef@....com>,
Will Deacon <will@...nel.org>,
Waiman Long <longman@...hat.com>,
Boqun Feng <boqun.feng@...il.com>,
"Connor O'Brien" <connoro@...gle.com>
Subject: [PATCH RFC 2/3] locktorture: Allow non-rtmutex lock types to be boosted
Currently RT boosting is only done for rtmutex_lock, however with proxy
execution, we also have the mutex_lock participating in priorities. To
exercise the testing better, add RT boosting to other lock testing types
as well, using a new knob (rt_boost).
Tested with boot parameters:
locktorture.torture_type=mutex_lock
locktorture.onoff_interval=1
locktorture.nwriters_stress=8
locktorture.stutter=0
locktorture.rt_boost=1
locktorture.rt_boost_factor=1
locktorture.nlocks=3
For the rtmutex test, rt_boost is always enabled even if disabling is
requested.
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
kernel/locking/locktorture.c | 91 +++++++++++++++++++-----------------
1 file changed, 48 insertions(+), 43 deletions(-)
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index bc3557677eed..5a388ac96a9b 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -46,6 +46,7 @@ torture_param(int, shutdown_secs, 0, "Shutdown time (j), <= zero to disable.");
torture_param(int, stat_interval, 60,
"Number of seconds between stats printk()s");
torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable");
+torture_param(int, rt_boost, 0, "Perform an rt-boost from the writer, always 1 for rtmutex_lock");
torture_param(int, verbose, 1,
"Enable verbose debugging printk()s");
torture_param(int, nlocks, 1,
@@ -129,15 +130,44 @@ static void torture_lock_busted_write_unlock(int tid __maybe_unused)
/* BUGGY, do not use in real life!!! */
}
-static void torture_boost_dummy(struct torture_random_state *trsp)
+static void torture_rt_boost(struct torture_random_state *trsp)
{
- /* Only rtmutexes care about priority */
+ const unsigned int factor = 50000; /* yes, quite arbitrary */
+
+ if (!rt_boost)
+ return;
+
+ if (!rt_task(current)) {
+ /*
+ * Boost priority once every ~50k operations. When the
+ * task tries to take the lock, the rtmutex it will account
+ * for the new priority, and do any corresponding pi-dance.
+ */
+ if (trsp && !(torture_random(trsp) %
+ (cxt.nrealwriters_stress * factor))) {
+ sched_set_fifo(current);
+ } else /* common case, do nothing */
+ return;
+ } else {
+ /*
+ * The task will remain boosted for another ~500k operations,
+ * then restored back to its original prio, and so forth.
+ *
+ * When @trsp is nil, we want to force-reset the task for
+ * stopping the kthread.
+ */
+ if (!trsp || !(torture_random(trsp) %
+ (cxt.nrealwriters_stress * factor * 2))) {
+ sched_set_normal(current, 0);
+ } else /* common case, do nothing */
+ return;
+ }
}
static struct lock_torture_ops lock_busted_ops = {
.writelock = torture_lock_busted_write_lock,
.write_delay = torture_lock_busted_write_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_lock_busted_write_unlock,
.readlock = NULL,
.read_delay = NULL,
@@ -181,7 +211,7 @@ __releases(torture_spinlock)
static struct lock_torture_ops spin_lock_ops = {
.writelock = torture_spin_lock_write_lock,
.write_delay = torture_spin_lock_write_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_spin_lock_write_unlock,
.readlock = NULL,
.read_delay = NULL,
@@ -208,7 +238,7 @@ __releases(torture_spinlock)
static struct lock_torture_ops spin_lock_irq_ops = {
.writelock = torture_spin_lock_write_lock_irq,
.write_delay = torture_spin_lock_write_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_lock_spin_write_unlock_irq,
.readlock = NULL,
.read_delay = NULL,
@@ -277,7 +307,7 @@ __releases(torture_rwlock)
static struct lock_torture_ops rw_lock_ops = {
.writelock = torture_rwlock_write_lock,
.write_delay = torture_rwlock_write_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_rwlock_write_unlock,
.readlock = torture_rwlock_read_lock,
.read_delay = torture_rwlock_read_delay,
@@ -320,7 +350,7 @@ __releases(torture_rwlock)
static struct lock_torture_ops rw_lock_irq_ops = {
.writelock = torture_rwlock_write_lock_irq,
.write_delay = torture_rwlock_write_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_rwlock_write_unlock_irq,
.readlock = torture_rwlock_read_lock_irq,
.read_delay = torture_rwlock_read_delay,
@@ -362,7 +392,7 @@ __releases(torture_mutex)
static struct lock_torture_ops mutex_lock_ops = {
.writelock = torture_mutex_lock,
.write_delay = torture_mutex_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_mutex_unlock,
.readlock = NULL,
.read_delay = NULL,
@@ -460,7 +490,7 @@ static struct lock_torture_ops ww_mutex_lock_ops = {
.exit = torture_ww_mutex_exit,
.writelock = torture_ww_mutex_lock,
.write_delay = torture_mutex_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_ww_mutex_unlock,
.readlock = NULL,
.read_delay = NULL,
@@ -471,6 +501,11 @@ static struct lock_torture_ops ww_mutex_lock_ops = {
#ifdef CONFIG_RT_MUTEXES
static DEFINE_RT_MUTEX(torture_rtmutex);
+static void torture_rtmutex_init(void)
+{
+ rt_boost = 1;
+}
+
static int torture_rtmutex_lock(int tid __maybe_unused)
__acquires(torture_rtmutex)
{
@@ -478,37 +513,6 @@ __acquires(torture_rtmutex)
return 0;
}
-static void torture_rtmutex_boost(struct torture_random_state *trsp)
-{
- const unsigned int factor = 50000; /* yes, quite arbitrary */
-
- if (!rt_task(current)) {
- /*
- * Boost priority once every ~50k operations. When the
- * task tries to take the lock, the rtmutex it will account
- * for the new priority, and do any corresponding pi-dance.
- */
- if (trsp && !(torture_random(trsp) %
- (cxt.nrealwriters_stress * factor))) {
- sched_set_fifo(current);
- } else /* common case, do nothing */
- return;
- } else {
- /*
- * The task will remain boosted for another ~500k operations,
- * then restored back to its original prio, and so forth.
- *
- * When @trsp is nil, we want to force-reset the task for
- * stopping the kthread.
- */
- if (!trsp || !(torture_random(trsp) %
- (cxt.nrealwriters_stress * factor * 2))) {
- sched_set_normal(current, 0);
- } else /* common case, do nothing */
- return;
- }
-}
-
static void torture_rtmutex_delay(struct torture_random_state *trsp)
{
const unsigned long shortdelay_us = 2;
@@ -535,9 +539,10 @@ __releases(torture_rtmutex)
}
static struct lock_torture_ops rtmutex_lock_ops = {
+ .init = torture_rtmutex_init,
.writelock = torture_rtmutex_lock,
.write_delay = torture_rtmutex_delay,
- .task_boost = torture_rtmutex_boost,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_rtmutex_unlock,
.readlock = NULL,
.read_delay = NULL,
@@ -604,7 +609,7 @@ __releases(torture_rwsem)
static struct lock_torture_ops rwsem_lock_ops = {
.writelock = torture_rwsem_down_write,
.write_delay = torture_rwsem_write_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_rwsem_up_write,
.readlock = torture_rwsem_down_read,
.read_delay = torture_rwsem_read_delay,
@@ -656,7 +661,7 @@ static struct lock_torture_ops percpu_rwsem_lock_ops = {
.exit = torture_percpu_rwsem_exit,
.writelock = torture_percpu_rwsem_down_write,
.write_delay = torture_rwsem_write_delay,
- .task_boost = torture_boost_dummy,
+ .task_boost = torture_rt_boost,
.writeunlock = torture_percpu_rwsem_up_write,
.readlock = torture_percpu_rwsem_down_read,
.read_delay = torture_rwsem_read_delay,
--
2.38.1.584.g0f3c55d4c2-goog
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