Re: [PATCH v4 16/20] TP-futex: Group readers together in wait queue

2016-12-29 Thread kbuild test robot
Hi Waiman, [auto build test ERROR on linus/master] [also build test ERROR on v4.10-rc1 next-20161224] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Waiman-Long/futex-Introducing-throughput-opti

Re: [PATCH v4 16/20] TP-futex: Group readers together in wait queue

2016-12-29 Thread kbuild test robot
Hi Waiman, [auto build test ERROR on linus/master] [also build test ERROR on v4.10-rc1 next-20161224] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Waiman-Long/futex-Introducing-throughput-opti

[PATCH v4 16/20] TP-futex: Group readers together in wait queue

2016-12-29 Thread Waiman Long
All the TP futex lock waiters are serialized in the kernel using a kernel mutex which acts like a wait queue. The order at which the waiters popped out from the wait queue will affect performance when exclusive (writer) and shared (reader) lock waiters are mixed in the queue. The worst case scenari