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

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