Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Peter Zijlstra cfafcd117d futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock() ... By changing futex_lock_pi() to use rt_mutex_*_proxy_lock() all wait_list modifications are done under both hb->lock and wait_lock. This closes the obvious interleave pattern between futex_lock_pi() and futex_unlock_pi(), but not entirely so. See below: Before: futex_lock_pi() futex_unlock_pi() unlock hb->lock lock hb->lock unlock hb->lock lock rt_mutex->wait_lock unlock rt_mutex_wait_lock -EAGAIN lock rt_mutex->wait_lock list_add unlock rt_mutex->wait_lock schedule() lock rt_mutex->wait_lock list_del unlock rt_mutex->wait_lock <idem> -EAGAIN lock hb->lock After: futex_lock_pi() futex_unlock_pi() lock hb->lock lock rt_mutex->wait_lock list_add unlock rt_mutex->wait_lock unlock hb->lock schedule() lock hb->lock unlock hb->lock lock hb->lock lock rt_mutex->wait_lock list_del unlock rt_mutex->wait_lock lock rt_mutex->wait_lock unlock rt_mutex_wait_lock -EAGAIN unlock hb->lock It does however solve the earlier starvation/live-lock scenario which got introduced with the -EAGAIN since unlike the before scenario; where the -EAGAIN happens while futex_unlock_pi() doesn't hold any locks; in the after scenario it happens while futex_unlock_pi() actually holds a lock, and then it is serialized on that lock. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: juri.lelli@arm.com Cc: bigeasy@linutronix.de Cc: xlpang@redhat.com Cc: rostedt@goodmis.org Cc: mathieu.desnoyers@efficios.com Cc: jdesfossez@efficios.com Cc: dvhart@infradead.org Cc: bristot@redhat.com Link: http://lkml.kernel.org/r/20170322104152.062785528@infradead.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2017-03-23 19:10:09 +01:00
..
lockdep.c	locking/lockdep: Handle statically initialized PER_CPU locks properly	2017-03-16 09:57:08 +01:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
locktorture.c	sched/headers: Prepare for the removal of <linux/rtmutex.h> from <linux/sched.h>	2017-03-02 08:42:32 +01:00
Makefile
mcs_spinlock.h
mutex-debug.c
mutex-debug.h
mutex.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>	2017-03-02 08:42:34 +01:00
mutex.h
osq_lock.c
percpu-rwsem.c
qrwlock.c
qspinlock.c
qspinlock_paravirt.h
qspinlock_stat.h	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>	2017-03-02 08:42:27 +01:00
rtmutex-debug.c	futex: Remove rt_mutex_deadlock_account_*()	2017-03-23 19:10:07 +01:00
rtmutex-debug.h	futex: Remove rt_mutex_deadlock_account_*()	2017-03-23 19:10:07 +01:00
rtmutex.c	futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock()	2017-03-23 19:10:09 +01:00
rtmutex.h	futex: Remove rt_mutex_deadlock_account_*()	2017-03-23 19:10:07 +01:00
rtmutex_common.h	futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock()	2017-03-23 19:10:09 +01:00
rwsem-spinlock.c	locking/rwsem: Fix down_write_killable() for CONFIG_RWSEM_GENERIC_SPINLOCK=y	2017-03-16 09:28:30 +01:00
rwsem-xadd.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>	2017-03-02 08:42:34 +01:00
rwsem.c	locking/lockdep: Add new check to lock_downgrade()	2017-03-16 09:57:07 +01:00
rwsem.h
semaphore.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>	2017-03-02 08:42:34 +01:00
spinlock.c
spinlock_debug.c
test-ww_mutex.c	locking/ww_mutex: Improve test to cover acquire context changes	2017-03-16 09:57:09 +01:00