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[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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[PATCH 0/2] locking/percpu-rwsem: Optimizations/tweaks Peter Zijlstra <peterz@infradead.org> - 2016-07-14 20:40 +0200

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