search for: unlock_wait

...rent places in the two endianness > system. > > We override some arch_spin_XXX as powerpc has io_sync stuff which makes > sure the io operations are protected by the lock correctly. > > There is another special case, see commit > 2c610022711 ("locking/qspinlock: Fix spin_unlock_wait() some more") > > Signed-off-by: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com> > --- > arch/powerpc/include/asm/qspinlock.h | 66 +++++++++++++++++++++++++++++++ > arch/powerpc/include/asm/spinlock.h | 31 +++++++++------ > arch/powerpc/include/asm/spinlock...

...rent places in the two endianness > system. > > We override some arch_spin_XXX as powerpc has io_sync stuff which makes > sure the io operations are protected by the lock correctly. > > There is another special case, see commit > 2c610022711 ("locking/qspinlock: Fix spin_unlock_wait() some more") > > Signed-off-by: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com> > --- > arch/powerpc/include/asm/qspinlock.h | 66 +++++++++++++++++++++++++++++++ > arch/powerpc/include/asm/spinlock.h | 31 +++++++++------ > arch/powerpc/include/asm/spinlock...

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v8 -> v9: mv qspinlocm config entry to

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v8 -> v9: mv qspinlocm config entry to

...ts_equal() (Oleg) - head > tail situation can lead to false contended check (Oleg) - smp_mb__after_atomic() added after slowptha_enter (Oleg) Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

...ts_equal() (Oleg) - head > tail situation can lead to false contended check (Oleg) - smp_mb__after_atomic() added after slowptha_enter (Oleg) Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

...ion problem ?? Changes since V4: - one more usage of tickets_equal() (Oleg) - head > tail situation can lead to false contended check (Oleg) Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

...ion problem ?? Changes since V4: - one more usage of tickets_equal() (Oleg) - head > tail situation can lead to false contended check (Oleg) Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

..., 55 deletions(-) potential TODO: * The whole patch be splitted into, 1. move slowpath flag 2. fix memory corruption in completion problem ?? Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

..., 55 deletions(-) potential TODO: * The whole patch be splitted into, 1. move slowpath flag 2. fix memory corruption in completion problem ?? Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

...ts_equal() (Oleg) - head > tail situation can lead to false contended check (Oleg) - smp_mb__after_atomic() added after slowptha_enter (Oleg) Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

...ts_equal() (Oleg) - head > tail situation can lead to false contended check (Oleg) - smp_mb__after_atomic() added after slowptha_enter (Oleg) Changes since V3: - Detailed changelog (PeterZ) - Replace ACCESS_ONCE with READ_ONCE (oleg) - Add xen changes (Oleg) - Correct break logic in unlock_wait() (Oleg) Changes since V2: - Move the slowpath flag to head, this enables xadd usage in unlock code and inturn we can get rid of read/write after unlock (Oleg) - usage of ticket_equals (Oleg) Changes since V1: - Add missing TICKET_LOCK_INC before unlock kick (fixes hang in overcommit:...

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v7 -> v8: add one patch to drop a function call

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v7 -> v8: add one patch to drop a function call