From: "Connor O'Brien" <connoro@google.com>
To: linux-kernel@vger.kernel.org
Cc: kernel-team@android.com, John Stultz <jstultz@google.com>,
Joel Fernandes <joelaf@google.com>,
Qais Yousef <qais.yousef@arm.com>, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Valentin Schneider <vschneid@redhat.com>,
Will Deacon <will@kernel.org>, Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>,
"Paul E . McKenney" <paulmck@kernel.org>,
"Connor O'Brien" <connoro@google.com>
Subject: [RFC PATCH 06/11] kernel/locking: Expose mutex_owner()
Date: Mon, 3 Oct 2022 21:44:56 +0000 [thread overview]
Message-ID: <20221003214501.2050087-7-connoro@google.com> (raw)
In-Reply-To: <20221003214501.2050087-1-connoro@google.com>
From: Juri Lelli <juri.lelli@redhat.com>
Implementing proxy execution requires that scheduler code be able to
identify the current owner of a mutex. Expose a new helper
mutex_owner() for this purpose.
Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
[Removed the EXPORT_SYMBOL]
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Connor O'Brien <connoro@google.com>
---
include/linux/mutex.h | 2 ++
kernel/locking/mutex.c | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 8f226d460f51..ebdc59cb0bf6 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -118,6 +118,8 @@ do { \
extern void __mutex_init(struct mutex *lock, const char *name,
struct lock_class_key *key);
+extern struct task_struct *mutex_owner(struct mutex *lock);
+
/**
* mutex_is_locked - is the mutex locked
* @lock: the mutex to be queried
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index f39e9ee3c4d0..325fc9db5004 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -81,6 +81,11 @@ static inline struct task_struct *__mutex_owner(struct mutex *lock)
return (struct task_struct *)(atomic_long_read(&lock->owner) & ~MUTEX_FLAGS);
}
+struct task_struct *mutex_owner(struct mutex *lock)
+{
+ return __mutex_owner(lock);
+}
+
static inline struct task_struct *__owner_task(unsigned long owner)
{
return (struct task_struct *)(owner & ~MUTEX_FLAGS);
--
2.38.0.rc1.362.ged0d419d3c-goog
next prev parent reply other threads:[~2022-10-03 21:45 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-03 21:44 [RFC PATCH 00/11] Reviving the Proxy Execution Series Connor O'Brien
2022-10-03 21:44 ` [RFC PATCH 01/11] locking/ww_mutex: Remove wakeups from under mutex::wait_lock Connor O'Brien
2022-10-04 16:01 ` Waiman Long
2022-10-12 23:54 ` Joel Fernandes
2022-10-20 18:43 ` Connor O'Brien
2022-10-03 21:44 ` [RFC PATCH 02/11] locking/mutex: Rework task_struct::blocked_on Connor O'Brien
2022-10-03 21:44 ` [RFC PATCH 03/11] kernel/locking: Add p->blocked_on wrapper Connor O'Brien
2022-10-03 21:44 ` [RFC PATCH 04/11] locking/mutex: make mutex::wait_lock irq safe Connor O'Brien
2022-10-13 4:30 ` Joel Fernandes
2022-10-03 21:44 ` [RFC PATCH 05/11] sched: Split scheduler execution context Connor O'Brien
2022-10-14 17:01 ` Joel Fernandes
2022-10-19 17:17 ` Valentin Schneider
2022-10-20 18:43 ` Connor O'Brien
2022-10-03 21:44 ` Connor O'Brien [this message]
2022-10-03 21:44 ` [RFC PATCH 07/11] sched: Add proxy execution Connor O'Brien
2022-10-12 1:54 ` Joel Fernandes
2022-10-12 9:46 ` Juri Lelli
2022-10-14 17:07 ` Joel Fernandes
2022-10-15 13:53 ` Peter Zijlstra
2022-10-16 20:48 ` Steven Rostedt
2022-10-17 4:03 ` Joel Fernandes
2022-10-17 7:26 ` Peter Zijlstra
2022-10-24 22:33 ` Qais Yousef
2022-10-25 11:19 ` Joel Fernandes
2022-10-25 22:10 ` Qais Yousef
2022-10-15 15:28 ` Peter Zijlstra
2022-10-15 15:08 ` Peter Zijlstra
2022-10-15 15:10 ` Peter Zijlstra
2022-10-15 15:47 ` Peter Zijlstra
2022-10-24 10:13 ` Dietmar Eggemann
2022-10-29 3:31 ` Joel Fernandes
2022-10-31 16:39 ` Dietmar Eggemann
2022-10-31 18:00 ` Joel Fernandes
2022-11-04 17:09 ` Dietmar Eggemann
2022-11-21 0:22 ` Joel Fernandes
2022-11-21 1:49 ` Joel Fernandes
2022-11-21 3:59 ` Joel Fernandes
2022-11-22 18:45 ` Joel Fernandes
2023-01-09 8:51 ` Chen Yu
2022-10-03 21:44 ` [RFC PATCH 08/11] sched: Fixup task CPUs for potential proxies Connor O'Brien
2022-10-03 21:44 ` [RFC PATCH 09/11] sched/rt: Fix proxy/current (push,pull)ability Connor O'Brien
2022-10-10 11:40 ` Valentin Schneider
2022-10-14 22:32 ` Connor O'Brien
2022-10-19 17:05 ` Valentin Schneider
2022-10-20 13:30 ` Juri Lelli
2022-10-20 16:14 ` Valentin Schneider
2022-10-21 2:22 ` Connor O'Brien
2022-10-03 21:45 ` [RFC PATCH 10/11] torture: support randomized shuffling for proxy exec testing Connor O'Brien
2022-11-12 16:54 ` Joel Fernandes
2022-11-14 20:44 ` Connor O'Brien
2022-11-15 16:02 ` Joel Fernandes
2022-10-03 21:45 ` [RFC PATCH 11/11] locktorture: support nested mutexes Connor O'Brien
2022-10-06 9:59 ` [RFC PATCH 00/11] Reviving the Proxy Execution Series Juri Lelli
2022-10-06 10:07 ` Peter Zijlstra
2022-10-06 12:14 ` Juri Lelli
2022-10-15 15:44 ` Peter Zijlstra
2022-10-17 2:23 ` Joel Fernandes
2022-10-19 11:43 ` Qais Yousef
2022-10-19 12:23 ` Joel Fernandes
2022-10-19 13:41 ` Juri Lelli
2022-10-19 13:51 ` Joel Fernandes
2022-10-19 19:30 ` Qais Yousef
2022-10-20 8:51 ` Joel Fernandes
2022-10-17 3:25 ` Chengming Zhou
2022-10-17 3:56 ` Joel Fernandes
2022-10-17 4:26 ` Chengming Zhou
2022-10-17 12:27 ` Joel Fernandes
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