[PATCH 0/3] sched, timer: Improve scalability of itimers

Jason Low
2015-04-14T23:10:09Z

This patchset improves the scalability of itimers, thread_group_cputimer
and addresses a performance issue we found while running a database
workload where more than 30% of total time is spent in the kernel
trying to acquire the thread_group_cputimer spinlock.

While we're modifying sched and timer, patch 1 also updates all existing
usages of ACCESS_ONCE with the new READ_ONCE and WRITE_ONCE APIs in
those areas.