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-rw-r--r--include/linux/elevator.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index cc81645..9c5a04f 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -1,6 +1,8 @@
#ifndef _LINUX_ELEVATOR_H
#define _LINUX_ELEVATOR_H
+#include <linux/percpu.h>
+
typedef int (elevator_merge_fn) (request_queue_t *, struct request **,
struct bio *);
@@ -178,4 +180,27 @@ enum {
INIT_LIST_HEAD(&(rq)->donelist); \
} while (0)
+/*
+ * io context count accounting
+ */
+#define elv_ioc_count_mod(name, __val) \
+ do { \
+ preempt_disable(); \
+ __get_cpu_var(name) += (__val); \
+ preempt_enable(); \
+ } while (0)
+
+#define elv_ioc_count_inc(name) elv_ioc_count_mod(name, 1)
+#define elv_ioc_count_dec(name) elv_ioc_count_mod(name, -1)
+
+#define elv_ioc_count_read(name) \
+({ \
+ unsigned long __val = 0; \
+ int __cpu; \
+ smp_wmb(); \
+ for_each_possible_cpu(__cpu) \
+ __val += per_cpu(name, __cpu); \
+ __val; \
+})
+
#endif
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