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authorJosh Triplett <josht@us.ibm.com>2006-10-04 05:17:13 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 10:55:31 -0400
commitb772e1dd4b1e60a7a160f7bd4ea08e28394ceb54 (patch)
treeb462e17329ba1730178d35cccd1ce5cb928cc101 /Documentation/RCU
parent75cfef32f26d03f5d0a0833572d52f94ad858a36 (diff)
[PATCH] RCU: add fake writers to rcutorture
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. [bunk@stusta.de: cleanup] Acked-by: Paul McKenney <paulmck@us.ibm.com> Cc: Dipkanar Sarma <dipankar@in.ibm.com> Signed-off-by: Josh Triplett <josh@freedesktop.org> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/RCU')
-rw-r--r--Documentation/RCU/torture.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 2174badd31e0..2180ef93accc 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -28,6 +28,15 @@ nreaders This is the number of RCU reading threads supported.
28 To properly exercise RCU implementations with preemptible 28 To properly exercise RCU implementations with preemptible
29 read-side critical sections. 29 read-side critical sections.
30 30
31nfakewriters This is the number of RCU fake writer threads to run. Fake
32 writer threads repeatedly use the synchronous "wait for
33 current readers" function of the interface selected by
34 torture_type, with a delay between calls to allow for various
35 different numbers of writers running in parallel.
36 nfakewriters defaults to 4, which provides enough parallelism
37 to trigger special cases caused by multiple writers, such as
38 the synchronize_srcu() early return optimization.
39
31stat_interval The number of seconds between output of torture 40stat_interval The number of seconds between output of torture
32 statistics (via printk()). Regardless of the interval, 41 statistics (via printk()). Regardless of the interval,
33 statistics are printed when the module is unloaded. 42 statistics are printed when the module is unloaded.