Hi all, This is version three of the qspinlock patches I posted previously:
v1: https://lkml.org/lkml/2018/4/5/496 v2: https://lkml.org/lkml/2018/4/11/618 Changes since v2 include: * Fixed bisection issues * Fixed x86 PV build * Added patch proposing me as a co-maintainer * Rebased onto -rc2 All feedback welcome, Will --->8 Jason Low (1): locking/mcs: Use smp_cond_load_acquire() in mcs spin loop Waiman Long (1): locking/qspinlock: Add stat tracking for pending vs slowpath Will Deacon (12): barriers: Introduce smp_cond_load_relaxed and atomic_cond_read_relaxed locking/qspinlock: Merge struct __qspinlock into struct qspinlock locking/qspinlock: Bound spinning on pending->locked transition in slowpath locking/qspinlock/x86: Increase _Q_PENDING_LOOPS upper bound locking/qspinlock: Remove unbounded cmpxchg loop from locking slowpath locking/qspinlock: Kill cmpxchg loop when claiming lock from head of queue locking/qspinlock: Use atomic_cond_read_acquire locking/qspinlock: Use smp_cond_load_relaxed to wait for next node locking/qspinlock: Make queued_spin_unlock use smp_store_release locking/qspinlock: Elide back-to-back RELEASE operations with smp_wmb() locking/qspinlock: Use try_cmpxchg instead of cmpxchg when locking MAINTAINERS: Add myself as a co-maintainer for LOCKING PRIMITIVES MAINTAINERS | 1 + arch/x86/include/asm/qspinlock.h | 21 ++- arch/x86/include/asm/qspinlock_paravirt.h | 3 +- include/asm-generic/atomic-long.h | 2 + include/asm-generic/barrier.h | 27 +++- include/asm-generic/qspinlock.h | 2 +- include/asm-generic/qspinlock_types.h | 32 +++- include/linux/atomic.h | 2 + kernel/locking/mcs_spinlock.h | 10 +- kernel/locking/qspinlock.c | 247 ++++++++++++++---------------- kernel/locking/qspinlock_paravirt.h | 44 ++---- kernel/locking/qspinlock_stat.h | 9 +- 12 files changed, 209 insertions(+), 191 deletions(-) -- 2.1.4
