From abb06b99484a9f5af05c7147c289faf835f68e8e Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 26 Jan 2017 13:45:38 -0800 Subject: 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 --- Documentation/RCU/Design/Data-Structures/Data-Structures.html | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'Documentation/RCU') 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;

The ->dynticks_nesting field counts the @@ -1117,11 +1118,17 @@ NMIs are counted by the ->dynticks_nmi_nesting field, except that NMIs that interrupt non-dyntick-idle execution are not counted. -

Finally, the ->dynticks field counts the corresponding +

The ->dynticks 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. +

Finally, the ->rcu_sched_qs_mask 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 cond_resched() +code, which provide a momentary idle sojourn in response. + -- cgit v1.2.3
 
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