rcu: Simplify quiescent-state detection

Browse source

The current quiescent-state detection algorithm is needlessly
complex.  It records the grace-period number corresponding to
the quiescent state at the time of the quiescent state, which
works, but it seems better to simply erase any record of previous
quiescent states at the time that the CPU notices the new grace
period.  This has the further advantage of removing another piece
of RCU for which lockless reasoning is required.

Therefore, this commit makes this change.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

...

This commit is contained in:

Paul E. McKenney 2012-08-21 15:00:05 -07:00 • committed by Paul E. McKenney

parent 1943c89de7

commit d7d6a11e86

4 changed files with 16 additions and 27 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

27

kernel/rcutree.c

View file

2

kernel/rcutree.h

View file

2

kernel/rcutree_plugin.h

View file

12

kernel/rcutree_trace.c

View file