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authorFrederic Weisbecker <[email protected]>2024-05-15 14:53:32 +0200
committerPaul E. McKenney <[email protected]>2024-06-28 06:44:12 -0700
commit677ab23bdf416ec8f3ecaf10d7cc8d0ccb46adab (patch)
tree5cb19cf4715bee07250a4e0c0ffbf376c4ee0a2a /tools/perf/scripts/python/parallel-perf.py
parent55911a9f4287c19bf7ef29aeace14044a6ed88cb (diff)
rcu/exp: Remove redundant full memory barrier at the end of GP
A full memory barrier is necessary at the end of the expedited grace period to order: 1) The grace period completion (pictured by the GP sequence number) with all preceding accesses. This pairs with rcu_seq_end() performed by the concurrent kworker. 2) The grace period completion and subsequent post-GP update side accesses. Pairs again against rcu_seq_end(). This full barrier is already provided by the final sync_exp_work_done() test, making the subsequent explicit one redundant. Remove it and improve comments. Signed-off-by: Frederic Weisbecker <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Reviewed-by: Boqun Feng <[email protected]> Reviewed-by: Neeraj Upadhyay <[email protected]>
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