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-rw-r--r--Documentation/RCU/00-INDEX2
-rw-r--r--Documentation/RCU/stallwarn.txt23
2 files changed, 14 insertions, 11 deletions
diff --git a/Documentation/RCU/00-INDEX b/Documentation/RCU/00-INDEX
index 71b6f500ddb9..1d7a885761f5 100644
--- a/Documentation/RCU/00-INDEX
+++ b/Documentation/RCU/00-INDEX
@@ -21,7 +21,7 @@ rcu.txt
RTFP.txt
- List of RCU papers (bibliography) going back to 1980.
stallwarn.txt
- - RCU CPU stall warnings (CONFIG_RCU_CPU_STALL_DETECTOR)
+ - RCU CPU stall warnings (module parameter rcu_cpu_stall_suppress)
torture.txt
- RCU Torture Test Operation (CONFIG_RCU_TORTURE_TEST)
trace.txt
diff --git a/Documentation/RCU/stallwarn.txt b/Documentation/RCU/stallwarn.txt
index 862c08ef1fde..4e959208f736 100644
--- a/Documentation/RCU/stallwarn.txt
+++ b/Documentation/RCU/stallwarn.txt
@@ -1,22 +1,25 @@
Using RCU's CPU Stall Detector
-The CONFIG_RCU_CPU_STALL_DETECTOR kernel config parameter enables
-RCU's CPU stall detector, which detects conditions that unduly delay
-RCU grace periods. The stall detector's idea of what constitutes
-"unduly delayed" is controlled by a set of C preprocessor macros:
+The rcu_cpu_stall_suppress module parameter enables RCU's CPU stall
+detector, which detects conditions that unduly delay RCU grace periods.
+This module parameter enables CPU stall detection by default, but
+may be overridden via boot-time parameter or at runtime via sysfs.
+The stall detector's idea of what constitutes "unduly delayed" is
+controlled by a set of kernel configuration variables and cpp macros:
-RCU_SECONDS_TILL_STALL_CHECK
+CONFIG_RCU_CPU_STALL_TIMEOUT
- This macro defines the period of time that RCU will wait from
- the beginning of a grace period until it issues an RCU CPU
- stall warning. This time period is normally ten seconds.
+ This kernel configuration parameter defines the period of time
+ that RCU will wait from the beginning of a grace period until it
+ issues an RCU CPU stall warning. This time period is normally
+ ten seconds.
RCU_SECONDS_TILL_STALL_RECHECK
This macro defines the period of time that RCU will wait after
issuing a stall warning until it issues another stall warning
- for the same stall. This time period is normally set to thirty
- seconds.
+ for the same stall. This time period is normally set to three
+ times the check interval plus thirty seconds.
RCU_STALL_RAT_DELAY