rcu: Introduce grace-period sequence numbers

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This commit adds grace-period sequence numbers (->gp_seq) to the
rcu_state, rcu_node, and rcu_data structures, and updates them.
It also checks for consistency between rsp->gpnum and rsp->gp_seq.
These ->gp_seq counters will eventually replace the existing ->gpnum
and ->completed counters, allowing a single memory access to determine
whether or not a grace period is in progress and if so, which one.
This in turn will enable changes that will reduce ->lock contention on
the leaf rcu_node structures.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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This commit is contained in:

Paul E. McKenney 2018-04-26 11:52:09 -07:00

parent 609af1cdf0

commit de30ad512a

2 changed files with 18 additions and 1 deletions

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16

kernel/rcu/tree.c

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3

kernel/rcu/tree.h

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