rcu: document TINY_RCU and TINY_PREEMPT_RCU tracing.

Add the required verbiage to Documentation/RCU/trace.txt.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 124 insertions, 8 deletions

diff --git a/Documentation/RCU/trace.txt b/Documentation/RCU/trace.txt
index a851118775d8..ff6d3f10c82f 100644
--- a/Documentation/RCU/trace.txt
+++ b/Documentation/RCU/trace.txt
@@ -1,18 +1,22 @@
 CONFIG_RCU_TRACE debugfs Files and Formats
 
 
-The rcutree implementation of RCU provides debugfs trace output that
-summarizes counters and state.  This information is useful for debugging
-RCU itself, and can sometimes also help to debug abuses of RCU.
-The following sections describe the debugfs files and formats.
+The rcutree and rcutiny implementations of RCU provide debugfs trace
+output that summarizes counters and state.  This information is useful for
+debugging RCU itself, and can sometimes also help to debug abuses of RCU.
+The following sections describe the debugfs files and formats, first
+for rcutree and next for rcutiny.
 
 
-Hierarchical RCU debugfs Files and Formats
+CONFIG_TREE_RCU and CONFIG_TREE_PREEMPT_RCU debugfs Files and Formats
 
-This implementation of RCU provides three debugfs files under the
+These implementations of RCU provides five debugfs files under the
 top-level directory RCU: rcu/rcudata (which displays fields in struct
-rcu_data), rcu/rcugp (which displays grace-period counters), and
-rcu/rcuhier (which displays the struct rcu_node hierarchy).
+rcu_data), rcu/rcudata.csv (which is a .csv spreadsheet version of
+rcu/rcudata), rcu/rcugp (which displays grace-period counters),
+rcu/rcuhier (which displays the struct rcu_node hierarchy), and
+rcu/rcu_pending (which displays counts of the reasons that the
+rcu_pending() function decided that there was core RCU work to do).
 
 The output of "cat rcu/rcudata" looks as follows:
 
@@ -326,3 +330,115 @@ o	"nn" is the number of times that this CPU needed nothing.  Alert
         readers will note that the rcu "nn" number for a given CPU very
         closely matches the rcu_bh "np" number for that same CPU.  This
         is due to short-circuit evaluation in rcu_pending().
+
+
+CONFIG_TINY_RCU and CONFIG_TINY_PREEMPT_RCU debugfs Files and Formats
+
+These implementations of RCU provides a single debugfs file under the
+top-level directory RCU, namely rcu/rcudata, which displays fields in
+rcu_bh_ctrlblk, rcu_sched_ctrlblk and, for CONFIG_TINY_PREEMPT_RCU,
+rcu_preempt_ctrlblk.
+
+The output of "cat rcu/rcudata" is as follows:
+
+rcu_preempt: qlen=24 gp=1097669 g197/p197/c197 tasks=...
+             ttb=. btg=no ntb=184 neb=0 nnb=183 j=01f7 bt=0274
+             normal balk: nt=1097669 gt=0 bt=371 b=0 ny=25073378 nos=0
+             exp balk: bt=0 nos=0
+rcu_sched: qlen: 0
+rcu_bh: qlen: 0
+
+This is split into rcu_preempt, rcu_sched, and rcu_bh sections, with the
+rcu_preempt section appearing only in CONFIG_TINY_PREEMPT_RCU builds.
+The last three lines of the rcu_preempt section appear only in
+CONFIG_RCU_BOOST kernel builds.  The fields are as follows:
+
+o       "qlen" is the number of RCU callbacks currently waiting either
+        for an RCU grace period or waiting to be invoked.  This is the
+        only field present for rcu_sched and rcu_bh, due to the
+        short-circuiting of grace period in those two cases.
+
+o       "gp" is the number of grace periods that have completed.
+
+o       "g197/p197/c197" displays the grace-period state, with the
+        "g" number being the number of grace periods that have started
+        (mod 256), the "p" number being the number of grace periods
+        that the CPU has responded to (also mod 256), and the "c"
+        number being the number of grace periods that have completed
+        (once again mode 256).
+
+        Why have both "gp" and "g"?  Because the data flowing into
+        "gp" is only present in a CONFIG_RCU_TRACE kernel.
+
+o       "tasks" is a set of bits.  The first bit is "T" if there are
+        currently tasks that have recently blocked within an RCU
+        read-side critical section, the second bit is "N" if any of the
+        aforementioned tasks are blocking the current RCU grace period,
+        and the third bit is "E" if any of the aforementioned tasks are
+        blocking the current expedited grace period.  Each bit is "."
+        if the corresponding condition does not hold.
+
+o       "ttb" is a single bit.  It is "B" if any of the blocked tasks
+        need to be priority boosted and "." otherwise.
+
+o       "btg" indicates whether boosting has been carried out during
+        the current grace period, with "exp" indicating that boosting
+        is in progress for an expedited grace period, "no" indicating
+        that boosting has not yet started for a normal grace period,
+        "begun" indicating that boosting has bebug for a normal grace
+        period, and "done" indicating that boosting has completed for
+        a normal grace period.
+
+o       "ntb" is the total number of tasks subjected to RCU priority boosting
+        periods since boot.
+
+o       "neb" is the number of expedited grace periods that have had
+        to resort to RCU priority boosting since boot.
+
+o       "nnb" is the number of normal grace periods that have had
+        to resort to RCU priority boosting since boot.
+
+o       "j" is the low-order 12 bits of the jiffies counter in hexadecimal.
+
+o       "bt" is the low-order 12 bits of the value that the jiffies counter
+        will have at the next time that boosting is scheduled to begin.
+
+o       In the line beginning with "normal balk", the fields are as follows:
+
+        o       "nt" is the number of times that the system balked from
+                boosting because there were no blocked tasks to boost.
+                Note that the system will balk from boosting even if the
+                grace period is overdue when the currently running task
+                is looping within an RCU read-side critical section.
+                There is no point in boosting in this case, because
+                boosting a running task won't make it run any faster.
+
+        o       "gt" is the number of times that the system balked
+                from boosting because, although there were blocked tasks,
+                none of them were preventing the current grace period
+                from completing.
+
+        o       "bt" is the number of times that the system balked
+                from boosting because boosting was already in progress.
+
+        o       "b" is the number of times that the system balked from
+                boosting because boosting had already completed for
+                the grace period in question.
+
+        o       "ny" is the number of times that the system balked from
+                boosting because it was not yet time to start boosting
+                the grace period in question.
+
+        o       "nos" is the number of times that the system balked from
+                boosting for inexplicable ("not otherwise specified")
+                reasons.  This can actually happen due to races involving
+                increments of the jiffies counter.
+
+o       In the line beginning with "exp balk", the fields are as follows:
+
+        o       "bt" is the number of times that the system balked from
+                boosting because there were no blocked tasks to boost.
+
+        o       "nos" is the number of times that the system balked from
+                 boosting for inexplicable ("not otherwise specified")
+                 reasons.