block: use nanosecond resolution for iostat

[uclinux-h8/linux.git] / include / linux / genhd.h

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 5786442..25c08c6 100644 (file)
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -83,10 +83,10 @@ struct partition {
 } __attribute__((packed));
 
 struct disk_stats {
+       u64 nsecs[NR_STAT_GROUPS];
        unsigned long sectors[NR_STAT_GROUPS];
        unsigned long ios[NR_STAT_GROUPS];
        unsigned long merges[NR_STAT_GROUPS];
-       unsigned long ticks[NR_STAT_GROUPS];
        unsigned long io_ticks;
        unsigned long time_in_queue;
 };
@@ -354,6 +354,9 @@ static inline void free_part_stats(struct hd_struct *part)
 
 #endif /* CONFIG_SMP */
 
+#define part_stat_read_msecs(part, which)                              \
+       div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC)
+
 #define part_stat_read_accum(part, field)                              \
        (part_stat_read(part, field[STAT_READ]) +                       \
         part_stat_read(part, field[STAT_WRITE]) +                      \