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rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure

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The rcu_sched_qs_mask variable is yet another isolated per-CPU variable,
so this commit pulls it into the pre-existing rcu_dynticks per-CPU
structure.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2017-01-26 13:45:38 -08:00
parent 88a4976d0e
commit abb06b9948
3 changed files with 14 additions and 8 deletions
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9
Documentation/RCU/Design/Data-Structures/Data-Structures.html
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@@ -1104,6 +1104,7 @@ Its fields are as follows:
1 int dynticks_nesting;
2 int dynticks_nmi_nesting;
3 atomic_t dynticks;
4 int rcu_sched_qs_mask;
</pre>
<p>The <tt>-&gt;dynticks_nesting</tt> field counts the
@@ -1117,11 +1118,17 @@ NMIs are counted by the <tt>-&gt;dynticks_nmi_nesting</tt>
field, except that NMIs that interrupt non-dyntick-idle execution
are not counted.
</p><p>Finally, the <tt>-&gt;dynticks</tt> field counts the corresponding
</p><p>The <tt>-&gt;dynticks</tt> field counts the corresponding
CPU's transitions to and from dyntick-idle mode, so that this counter
has an even value when the CPU is in dyntick-idle mode and an odd
value otherwise.
</p><p>Finally, the <tt>-&gt;rcu_sched_qs_mask</tt> field is used
to record the fact that the RCU core code would really like to
see a quiescent state from the corresponding CPU.
This flag is checked by RCU's context-switch and <tt>cond_resched()</tt>
code, which provide a momentary idle sojourn in response.
<table>
<tr><th>&nbsp;</th></tr>
<tr><th align="left">Quick Quiz:</th></tr>