Changeset 5b03a72 in mainline for kernel/generic/include/synch/rcu_types.h

Timestamp:

2012-07-29T17:53:48Z (12 years ago)

Author:

Adam Hraska <adam.hraska+hos@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

f0fcb04

Parents:

8e3ed06

Message:

rcu: Switched from using THREAD→nesting_cnt to CPU→nesting_cnt as the main nesting count variable. RCU no longer has to mess with pointers to the corrent nesting_cnt (and gets rid of one level of indirection when accessing the nesting count in reader sections).

File:

• kernel/generic/include/synch/rcu_types.h (modified) (2 diffs)

kernel/generic/include/synch/rcu_types.h

@@ -61 +61 @@
         rcu_gp_t last_seen_gp;
         
-        /** Pointer to the currently used nesting count (THREAD's or CPU's). */
-        size_t *pnesting_cnt;
-        /** Temporary nesting count if THREAD is NULL, eg in scheduler(). */
-        size_t tmp_nesting_cnt;
+        /** The number of times an RCU reader section is nested on this cpu. 
+         * 
+         * If positive, it is definitely executing reader code. If zero, 
+         * the thread might already be executing reader code thanks to
+         * cpu instruction reordering.
+         */
+        size_t nesting_cnt;
 
         /** Callbacks to invoke once the current grace period ends, ie cur_cbs_gp.
@@ -128 +131 @@
 /** RCU related per-thread data. */
 typedef struct rcu_thread_data {
-        /** The number of times an RCU reader section is nested. 
-         * 
-         * If positive, it is definitely executing reader code. If zero, 
-         * the thread might already be executing reader code thanks to
-         * cpu instruction reordering.
+        /** 
+         * Nesting count of the thread's RCU read sections when the thread 
+         * is not running.
          */
         size_t nesting_cnt;