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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
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...@@ -357,7 +357,7 @@ parts, starting in this section with the various phases of ...@@ -357,7 +357,7 @@ parts, starting in this section with the various phases of
grace-period initialization. grace-period initialization.
<p>The first ordering-related grace-period initialization action is to <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: grace-period-number counter, as shown below:
</p><p><img src="TreeRCU-gp-init-1.svg" alt="TreeRCU-gp-init-1.svg" width="75%"> </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). ...@@ -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> <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 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. <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%"> </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 ...@@ -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 to notice that a new grace period has started, as described in the next
section. section.
But because the grace-period kthread started the grace period at the But because the grace-period kthread started the grace period at the
root (with the increment of the <tt>rcu_state</tt> structure's root (with the advancing of the <tt>rcu_state</tt> structure's
<tt>-&gt;gpnum</tt> field) before setting each leaf <tt>rcu_node</tt> <tt>-&gt;gp_seq</tt> field) before setting each leaf <tt>rcu_node</tt>
structure's <tt>-&gt;gpnum</tt> field, each CPU's observation of 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 the start of the grace period will happen after the actual start
of the grace period. of the grace period.
...@@ -466,7 +466,7 @@ section that the grace period must wait on. ...@@ -466,7 +466,7 @@ section that the grace period must wait on.
<tr><td> <tr><td>
But a RCU read-side critical section might have started But a RCU read-side critical section might have started
after the beginning of the grace period 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? the grace period wait on such a critical section?
</td></tr> </td></tr>
<tr><th align="left">Answer:</th></tr> <tr><th align="left">Answer:</th></tr>
...@@ -609,10 +609,8 @@ states outstanding from other CPUs. ...@@ -609,10 +609,8 @@ states outstanding from other CPUs.
<h4><a name="Grace-Period Cleanup">Grace-Period Cleanup</a></h4> <h4><a name="Grace-Period Cleanup">Grace-Period Cleanup</a></h4>
<p>Grace-period cleanup first scans the <tt>rcu_node</tt> tree <p>Grace-period cleanup first scans the <tt>rcu_node</tt> tree
breadth-first setting all the <tt>-&gt;completed</tt> fields equal breadth-first advancing all the <tt>-&gt;gp_seq</tt> fields, then it
to the number of the newly completed grace period, then it sets advances the <tt>rcu_state</tt> structure's <tt>-&gt;gp_seq</tt> field.
the <tt>rcu_state</tt> structure's <tt>-&gt;completed</tt> field,
again to the number of the newly completed grace period.
The ordering effects are shown below: The ordering effects are shown below:
</p><p><img src="TreeRCU-gp-cleanup.svg" alt="TreeRCU-gp-cleanup.svg" width="75%"> </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. ...@@ -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 CPU has reported its quiescent state, but it may be some
milliseconds before RCU becomes aware of this. milliseconds before RCU becomes aware of this.
The latest reasonable candidate is once the <tt>rcu_state</tt> 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 but it is quite possible that some CPUs have already completed
phase two of their updates by that time. phase two of their updates by that time.
In short, if you are going to work with RCU, you need to 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. ...@@ -647,7 +645,7 @@ grace-period cleanup is complete, the next grace period can begin.
<h4><a name="Callback Invocation">Callback Invocation</a></h4> <h4><a name="Callback Invocation">Callback Invocation</a></h4>
<p>Once a given CPU's leaf <tt>rcu_node</tt> structure's <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 invoking its RCU callbacks that were waiting for this grace period
to end. to end.
These callbacks are identified by <tt>rcu_advance_cbs()</tt>, These callbacks are identified by <tt>rcu_advance_cbs()</tt>,
......
Documentation/RCU/Design/Memory-Ordering/TreeRCU-gp-cleanup.svg
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