Preempt-RCU: update RCU Documentation.

This patch updates the RCU documentation to reflect preemptible RCU as
well as recent publications.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Reviewed-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 6 deletions

diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 25a3c3f7d378..2967a65269d8 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -46,12 +46,13 @@ stat_interval	The number of seconds between output of torture
 
 shuffle_interval
                 The number of seconds to keep the test threads affinitied
-                to a particular subset of the CPUs.  Used in conjunction
-                with test_no_idle_hz.
+                to a particular subset of the CPUs, defaults to 5 seconds.
+                Used in conjunction with test_no_idle_hz.
 
 test_no_idle_hz Whether or not to test the ability of RCU to operate in
                 a kernel that disables the scheduling-clock interrupt to
                 idle CPUs.  Boolean parameter, "1" to test, "0" otherwise.
+                Defaults to omitting this test.
 
 torture_type    The type of RCU to test: "rcu" for the rcu_read_lock() API,
                 "rcu_sync" for rcu_read_lock() with synchronous reclamation,
@@ -82,8 +83,6 @@ be evident.  ;-)
 
 The entries are as follows:
 
-o       "ggp": The number of counter flips (or batches) since boot.
-
 o       "rtc": The hexadecimal address of the structure currently visible
         to readers.
 
@@ -117,8 +116,8 @@ o	"Reader Pipe": Histogram of "ages" of structures seen by readers.
 o       "Reader Batch": Another histogram of "ages" of structures seen
         by readers, but in terms of counter flips (or batches) rather
         than in terms of grace periods.  The legal number of non-zero
-        entries is again two.  The reason for this separate view is
-        that it is easier to get the third entry to show up in the
+        entries is again two.  The reason for this separate view is that
+        it is sometimes easier to get the third entry to show up in the
         "Reader Batch" list than in the "Reader Pipe" list.
 
 o       "Free-Block Circulation": Shows the number of torture structures