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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-06-12 15:12:21 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-08-20 11:38:41 -0700
commit2ec1f2d98752293f4831ce7d7bdbc3fc36bdd114 (patch)
treec1dc25a48d0bfac1381879587986578bc5100d0b /Documentation/RCU
parentd2818df168b2c80c7449e47bd349094c308fa323 (diff)
rcu: Increase rcutorture test coverage
Currently, rcutorture has separate torture_types to test synchronous, asynchronous, and expedited grace-period primitives. This has two disadvantages: (1) Three times the number of runs to cover the combinations and (2) Little testing of concurrent combinations of the three options. This commit therefore adds a pair of module parameters that control normal and expedited state, with the default being both types, randomly selected, by the fakewriter processes, thus reducing source-code size and increasing test coverage. In addtion, the writer task switches between asynchronous-normal and expedited grace-period primitives driven by the same pair of module parameters. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'Documentation/RCU')
-rw-r--r--Documentation/RCU/torture.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index d8a502387397..dac02a6219b1 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -42,6 +42,16 @@ fqs_holdoff Holdoff time (in microseconds) between consecutive calls
fqs_stutter Wait time (in seconds) between consecutive bursts
of calls to force_quiescent_state().
+gp_normal Make the fake writers use normal synchronous grace-period
+ primitives.
+
+gp_exp Make the fake writers use expedited synchronous grace-period
+ primitives. If both gp_normal and gp_exp are set, or
+ if neither gp_normal nor gp_exp are set, then randomly
+ choose the primitive so that about 50% are normal and
+ 50% expedited. By default, neither are set, which
+ gives best overall test coverage.
+
irqreader Says to invoke RCU readers from irq level. This is currently
done via timers. Defaults to "1" for variants of RCU that
permit this. (Or, more accurately, variants of RCU that do

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