Messages in this thread | | | Date | Thu, 14 Jul 2016 20:25:45 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 0/2] locking/percpu-rwsem: Optimizations/tweaks |
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As reported by John and Dmitry, Android tickles bad behaviour in cgroup_threadgroup_rwsem.
These two patches attempt to address the issue by optimizing the percpu-rwsem slow path and second add a bias knob to the percpu-rwsem that allows disabling the fast path which improves writer latency by getting rid of a synchronize_sched() call.
--- fs/super.c | 3 +- include/linux/percpu-rwsem.h | 96 +++++++++++++++-- kernel/cgroup.c | 2 +- kernel/locking/percpu-rwsem.c | 246 +++++++++++++++++++++++++----------------- 4 files changed, 239 insertions(+), 108 deletions(-)
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