Messages in this thread Patch in this message | | | Date | Sat, 19 Aug 2023 06:08:43 +0000 | Subject | [PATCH v5 09/19] locking/mutex: Switch to mutex handoffs for CONFIG_PROXY_EXEC | From | John Stultz <> |
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From: Peter Zijlstra <peterz@infradead.org>
Just the very earliest framework logic to provide the config option and switch to using mutex handoffs.
Cc: Joel Fernandes <joelaf@google.com> Cc: Qais Yousef <qyousef@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Valentin Schneider <vschneid@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ben Segall <bsegall@google.com> Cc: Zimuzo Ezeozue <zezeozue@google.com> Cc: Youssef Esmat <youssefesmat@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: Will Deacon <will@kernel.org> Cc: Waiman Long <longman@redhat.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: "Paul E . McKenney" <paulmck@kernel.org> Cc: kernel-team@android.com Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> [rebased, added comments and changelog] Signed-off-by: Juri Lelli <juri.lelli@redhat.com> [Fixed rebase conflicts] [squashed sched: Ensure blocked_on is always guarded by blocked_lock] Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> [fix rebase conflicts, various fixes & tweaks commented inline] [squashed sched: Use rq->curr vs rq->proxy checks] Signed-off-by: Connor O'Brien <connoro@google.com> [jstultz: Split out only the very basic initial framework for proxy logic from a larger patch.] Signed-off-by: John Stultz <jstultz@google.com> --- v5: Split out from core proxy patch --- kernel/Kconfig.locks | 2 +- kernel/locking/mutex.c | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks index 4198f0273ecd..791c98f1d329 100644 --- a/kernel/Kconfig.locks +++ b/kernel/Kconfig.locks @@ -226,7 +226,7 @@ config ARCH_SUPPORTS_ATOMIC_RMW config MUTEX_SPIN_ON_OWNER def_bool y - depends on SMP && ARCH_SUPPORTS_ATOMIC_RMW + depends on SMP && ARCH_SUPPORTS_ATOMIC_RMW && !PROXY_EXEC config RWSEM_SPIN_ON_OWNER def_bool y diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 687009eca2d1..5125bbab4119 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -913,6 +913,10 @@ static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigne mutex_release(&lock->dep_map, ip); +#ifdef CONFIG_PROXY_EXEC + /* Always force HANDOFF for Proxy Exec for now. Revisit. */ + owner = MUTEX_FLAG_HANDOFF; +#else /* CONFIG_PROXY_EXEC */ /* * Release the lock before (potentially) taking the spinlock such that * other contenders can get on with things ASAP. @@ -935,6 +939,7 @@ static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigne return; } } +#endif /* CONFIG_PROXY_EXEC */ raw_spin_lock_irqsave(&lock->wait_lock, flags); debug_mutex_unlock(lock); -- 2.42.0.rc1.204.g551eb34607-goog
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