Hello, Neeraj. On Mon, Jan 15, 2018 at 02:08:12PM +0530, Neeraj Upadhyay wrote: > - kworker/0:0 gets chance to run on cpu1; while processing > a work, it goes to sleep. However, it does not decrement > pool->nr_running. This is because WORKER_REBOUND (NOT_ > RUNNING) flag was cleared, when worker entered worker_
Do you mean that because REBOUND was set? > thread(). > > Worker 0 runs on cpu1 > worker_thread() > process_one_work() > wq_worker_sleeping() > if (worker->flags & WORKER_NOT_RUNNING) > return NULL; > if (WARN_ON_ONCE(pool->cpu != raw_smp_processor_id())) > <Does not decrement nr_running> > > - After this, when kworker/0:0 wakes up, this time on its > bounded cpu cpu0, it increments pool->nr_running again. > So, pool->nr_running becomes 2. Why is it suddenly 2? Who made it one on the account of the kworker? Do you see this happening? Or better, is there a (semi) reliable repro for this issue? Thanks. -- tejun
