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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-01-14 16:10:57 -0800
committerIngo Molnar <mingo@elte.hu>2010-01-16 10:25:22 +0100
commit4c54005ca438a8b46dd542b497d4f0dc2ca375e8 (patch)
tree4274fb9dcbd94480b93fecefcf83969db53461ba /Documentation/RCU/torture.txt
parentb6407e863934965cdc66cbc244d811ceeb6f4d77 (diff)
downloadlinux-4c54005ca438a8b46dd542b497d4f0dc2ca375e8.tar.bz2
rcu: 1Q2010 update for RCU documentation
Add expedited functions. Review documentation and update obsolete verbiage. Also fix the advice for the RCU CPU-stall kernel configuration parameter, and document RCU CPU-stall warnings. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <12635142581866-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 9dba3bb90e60..0e50bc2aa1e2 100644
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+++ b/Documentation/RCU/torture.txt
@@ -30,6 +30,18 @@ MODULE PARAMETERS
This module has the following parameters:
+fqs_duration Duration (in microseconds) of artificially induced bursts
+ of force_quiescent_state() invocations. In RCU
+ implementations having force_quiescent_state(), these
+ bursts help force races between forcing a given grace
+ period and that grace period ending on its own.
+
+fqs_holdoff Holdoff time (in microseconds) between consecutive calls
+ to force_quiescent_state() within a burst.
+
+fqs_stutter Wait time (in seconds) between consecutive bursts
+ of calls to force_quiescent_state().
+
irqreaders 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