Changeset 0cf813d in mainline for kernel/generic/include

Timestamp:

2012-07-16T15:37:11Z (14 years ago)

Author:

Adam Hraska <adam.hraska+hos@…>

Branches:

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

Children:

1c1da4b

Parents:

057e77f

Message:

rcu: Added new statistics. Changed reclaimers to run callbacks with preemption disabled if too many callbacks are pending in order to avoid exhausting system memory.

Location:

kernel/generic/include

Files:

• compiler/barrier.h (modified) (1 diff)
• synch/rcu.h (modified) (2 diffs)

kernel/generic/include/compiler/barrier.h

@@ -5 +5 @@
 #define compiler_barrier() asm volatile ("" ::: "memory")
 
+/** Forces the compiler to access (ie load/store) the variable only once. */
 #define ACCESS_ONCE(var) (*((volatile typeof(var)*)&(var)))
 

kernel/generic/include/synch/rcu.h

@@ -71 +71 @@
          */
         rcu_item_t *cur_cbs;
+        /** Number of callbacks in cur_cbs. */
+        size_t cur_cbs_cnt;
         /** Callbacks to invoke once the next grace period ends, ie next_cbs_gp. 
          * Accessed by the local reclaimer only.
          */
         rcu_item_t *next_cbs;
+        /** Number of callbacks in next_cbs. */
+        size_t next_cbs_cnt;
         /** New callbacks are place at the end of this list. */
         rcu_item_t *arriving_cbs;
@@ -114 +118 @@
         size_t stat_avg_cbs;
         size_t stat_missed_gps;
+        size_t stat_missed_gp_in_wait;
+        size_t stat_max_slice_cbs;
+        size_t last_arriving_cnt;
 } rcu_cpu_data_t;