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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-01-26 13:45:38 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-04-18 11:38:17 -0700 |
| commit | abb06b99484a9f5af05c7147c289faf835f68e8e (patch) | |
| tree | ff5a96680bf5e7049ab9a8ee9c687fc88ca59eef /Documentation/RCU | |
| parent | 88a4976d0e37c0797ff3e6579a5f91cb7dced90d (diff) | |
| download | lwn-abb06b99484a9f5af05c7147c289faf835f68e8e.tar.gz lwn-abb06b99484a9f5af05c7147c289faf835f68e8e.zip | |
rcu: Pull rcu_sched_qs_mask into rcu_dynticks structure
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>
Diffstat (limited to 'Documentation/RCU')
| -rw-r--r-- | Documentation/RCU/Design/Data-Structures/Data-Structures.html | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/RCU/Design/Data-Structures/Data-Structures.html b/Documentation/RCU/Design/Data-Structures/Data-Structures.html index d583c653a703..bf7f266e8888 100644 --- a/Documentation/RCU/Design/Data-Structures/Data-Structures.html +++ b/Documentation/RCU/Design/Data-Structures/Data-Structures.html @@ -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>->dynticks_nesting</tt> field counts the @@ -1117,11 +1118,17 @@ NMIs are counted by the <tt>->dynticks_nmi_nesting</tt> field, except that NMIs that interrupt non-dyntick-idle execution are not counted. -</p><p>Finally, the <tt>->dynticks</tt> field counts the corresponding +</p><p>The <tt>->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>->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> </th></tr> <tr><th align="left">Quick Quiz:</th></tr> |