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Commit 869cc745 authored by Paul E. McKenney's avatar Paul E. McKenney
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doc: Update memory-ordering documentation for ->gp-seq 

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent b1e1f21f
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Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.html
View file @ 869cc745
......@@ -357,7 +357,7 @@ parts, starting in this section with the various phases of
grace-period initialization.
<p>The first ordering-related grace-period initialization action is to
increment the <tt>rcu_state</tt> structure's <tt>-&gt;gpnum</tt>
advance the <tt>rcu_state</tt> structure's <tt>-&gt;gp_seq</tt>
grace-period-number counter, as shown below:
</p><p><img src="TreeRCU-gp-init-1.svg" alt="TreeRCU-gp-init-1.svg" width="75%">
......@@ -388,7 +388,7 @@ its last CPU and if the next <tt>rcu_node</tt> structure has no online CPUs).
<p>The final <tt>rcu_gp_init()</tt> pass through the <tt>rcu_node</tt>
tree traverses breadth-first, setting each <tt>rcu_node</tt> structure's
<tt>-&gt;gpnum</tt> field to the newly incremented value from the
<tt>-&gt;gp_seq</tt> field to the newly advanced value from the
<tt>rcu_state</tt> structure, as shown in the following diagram.
</p><p><img src="TreeRCU-gp-init-3.svg" alt="TreeRCU-gp-init-1.svg" width="75%">
......@@ -398,9 +398,9 @@ tree traverses breadth-first, setting each <tt>rcu_node</tt> structure's
to notice that a new grace period has started, as described in the next
section.
But because the grace-period kthread started the grace period at the
root (with the increment of the <tt>rcu_state</tt> structure's
<tt>-&gt;gpnum</tt> field) before setting each leaf <tt>rcu_node</tt>
structure's <tt>-&gt;gpnum</tt> field, each CPU's observation of
root (with the advancing of the <tt>rcu_state</tt> structure's
<tt>-&gt;gp_seq</tt> field) before setting each leaf <tt>rcu_node</tt>
structure's <tt>-&gt;gp_seq</tt> field, each CPU's observation of
the start of the grace period will happen after the actual start
of the grace period.
......@@ -466,7 +466,7 @@ section that the grace period must wait on.
<tr><td>
But a RCU read-side critical section might have started
after the beginning of the grace period
(the <tt>-&gt;gpnum++</tt> from earlier), so why should
(the advancing of <tt>-&gt;gp_seq</tt> from earlier), so why should
the grace period wait on such a critical section?
</td></tr>
<tr><th align="left">Answer:</th></tr>
......@@ -609,10 +609,8 @@ states outstanding from other CPUs.
<h4><a name="Grace-Period Cleanup">Grace-Period Cleanup</a></h4>
<p>Grace-period cleanup first scans the <tt>rcu_node</tt> tree
breadth-first setting all the <tt>-&gt;completed</tt> fields equal
to the number of the newly completed grace period, then it sets
the <tt>rcu_state</tt> structure's <tt>-&gt;completed</tt> field,
again to the number of the newly completed grace period.
breadth-first advancing all the <tt>-&gt;gp_seq</tt> fields, then it
advances the <tt>rcu_state</tt> structure's <tt>-&gt;gp_seq</tt> field.
The ordering effects are shown below:
</p><p><img src="TreeRCU-gp-cleanup.svg" alt="TreeRCU-gp-cleanup.svg" width="75%">
......@@ -634,7 +632,7 @@ grace-period cleanup is complete, the next grace period can begin.
CPU has reported its quiescent state, but it may be some
milliseconds before RCU becomes aware of this.
The latest reasonable candidate is once the <tt>rcu_state</tt>
structure's <tt>-&gt;completed</tt> field has been updated,
structure's <tt>-&gt;gp_seq</tt> field has been updated,
but it is quite possible that some CPUs have already completed
phase two of their updates by that time.
In short, if you are going to work with RCU, you need to
......@@ -647,7 +645,7 @@ grace-period cleanup is complete, the next grace period can begin.
<h4><a name="Callback Invocation">Callback Invocation</a></h4>
<p>Once a given CPU's leaf <tt>rcu_node</tt> structure's
<tt>-&gt;completed</tt> field has been updated, that CPU can begin
<tt>-&gt;gp_seq</tt> field has been updated, that CPU can begin
invoking its RCU callbacks that were waiting for this grace period
to end.
These callbacks are identified by <tt>rcu_advance_cbs()</tt>,
......
Documentation/RCU/Design/Memory-Ordering/TreeRCU-gp-cleanup.svg
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