1 files changed, 34 insertions, 0 deletions
diff --git a/libbcache/clock_types.h b/libbcache/clock_types.h
new file mode 100644
index 00000000..4a02f467
--- /dev/null
+++ b/libbcache/clock_types.h
@@ -0,0 +1,34 @@
+#ifndef _BCACHE_CLOCK_TYPES_H
+#define _BCACHE_CLOCK_TYPES_H
+
+#include "util.h"
+
+#define NR_IO_TIMERS		8
+
+/*
+ * Clocks/timers in units of sectors of IO:
+ *
+ * Note - they use percpu batching, so they're only approximate.
+ */
+
+struct io_timer;
+typedef void (*io_timer_fn)(struct io_timer *);
+
+struct io_timer {
+	io_timer_fn		fn;
+	unsigned long		expire;
+};
+
+/* Amount to buffer up on a percpu counter */
+#define IO_CLOCK_PCPU_SECTORS	128
+
+struct io_clock {
+	atomic_long_t		now;
+	u16 __percpu		*pcpu_buf;
+
+	spinlock_t		timer_lock;
+	DECLARE_HEAP(struct io_timer *, timers);
+};
+
+#endif /* _BCACHE_CLOCK_TYPES_H */
+