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[PATCH] RCU: add fake writers to rcutorture

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rcutorture currently has one writer and an arbitrary number of readers.  To
better exercise some of the code paths in RCU implementations, add fake
writer threads which call the synchronize function for the RCU variant in a
loop, with a delay between calls to arrange for different numbers of
writers running in parallel.

[[email protected]: cleanup]
Acked-by: Paul McKenney <[email protected]>
Cc: Dipkanar Sarma <[email protected]>
Signed-off-by: Josh Triplett <[email protected]>
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Josh Triplett 2006-10-04 02:17:13 -07:00 • committed by Linus Torvalds
commit b772e1dd4b
2 changed files with 113 additions and 5 deletions
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9
Documentation/RCU/torture.txt
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@ -28,6 +28,15 @@ nreaders This is the number of RCU reading threads supported.
To properly exercise RCU implementations with preemptible
read-side critical sections.
nfakewriters This is the number of RCU fake writer threads to run. Fake
writer threads repeatedly use the synchronous "wait for
current readers" function of the interface selected by
torture_type, with a delay between calls to allow for various
different numbers of writers running in parallel.
nfakewriters defaults to 4, which provides enough parallelism
to trigger special cases caused by multiple writers, such as
the synchronize_srcu() early return optimization.
stat_interval The number of seconds between output of torture
statistics (via printk()). Regardless of the interval,
statistics are printed when the module is unloaded.