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-rw-r--r--Documentation/locking/locktorture.txt16
1 files changed, 12 insertions, 4 deletions
diff --git a/Documentation/locking/locktorture.txt b/Documentation/locking/locktorture.txt
index f2a905b27862..7a72621b924f 100644
--- a/Documentation/locking/locktorture.txt
+++ b/Documentation/locking/locktorture.txt
@@ -29,6 +29,11 @@ nwriters_stress Number of kernel threads that will stress exclusive lock
ownership (writers). The default value is twice the number
of online CPUs.
+nreaders_stress Number of kernel threads that will stress shared lock
+ ownership (readers). The default is the same amount of writer
+ locks. If the user did not specify nwriters_stress, then
+ both readers and writers be the amount of online CPUs.
+
torture_type Type of lock to torture. By default, only spinlocks will
be tortured. This module can torture the following locks,
with string values as follows:
@@ -97,15 +102,18 @@ STATISTICS
Statistics are printed in the following format:
spin_lock-torture: Writes: Total: 93746064 Max/Min: 0/0 Fail: 0
- (A) (B) (C) (D)
+ (A) (B) (C) (D) (E)
(A): Lock type that is being tortured -- torture_type parameter.
-(B): Number of times the lock was acquired.
+(B): Number of writer lock acquisitions. If dealing with a read/write primitive
+ a second "Reads" statistics line is printed.
+
+(C): Number of times the lock was acquired.
-(C): Min and max number of times threads failed to acquire the lock.
+(D): Min and max number of times threads failed to acquire the lock.
-(D): true/false values if there were errors acquiring the lock. This should
+(E): true/false values if there were errors acquiring the lock. This should
-only- be positive if there is a bug in the locking primitive's
implementation. Otherwise a lock should never fail (i.e., spin_lock()).
Of course, the same applies for (C), above. A dummy example of this is