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authorTejun Heo <tj@kernel.org>2012-04-02 01:38:42 +0400
committerTejun Heo <tj@kernel.org>2012-04-02 01:38:42 +0400
commitd3d32e69fa368e131b25ee68806aa3fd3916cec1 (patch)
treef6413e70f38cffb3b363fa831b5f868d90bb6c80 /block/blk-cgroup.h
parentedcb0722c654947908388df660791abd41e6617c (diff)
downloadlinux-d3d32e69fa368e131b25ee68806aa3fd3916cec1.tar.xz
blkcg: restructure statistics printing
blkcg stats handling is a mess. None of the stats has much to do with blkcg core but they are all implemented in blkcg core. Code sharing is achieved by mixing common code with hard-coded cases for each stat counter. This patch restructures statistics printing such that * Common logic exists as helper functions and specific print functions use the helpers to implement specific cases. * Printing functions serving multiple counters don't require hardcoded switching on specific counters. * Printing uses read_seq_string callback (other methods will be phased out). This change enables further cleanups and relocating stats code to the policy implementation it belongs to. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'block/blk-cgroup.h')
-rw-r--r--block/blk-cgroup.h60
1 files changed, 4 insertions, 56 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 7578df3938b4..7331d7965a5e 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -28,46 +28,10 @@ enum blkio_policy_id {
#ifdef CONFIG_BLK_CGROUP
-enum stat_type {
- /* Number of IOs merged */
- BLKIO_STAT_MERGED,
- /* Total time spent (in ns) between request dispatch to the driver and
- * request completion for IOs doen by this cgroup. This may not be
- * accurate when NCQ is turned on. */
- BLKIO_STAT_SERVICE_TIME,
- /* Total time spent waiting in scheduler queue in ns */
- BLKIO_STAT_WAIT_TIME,
- /* Number of IOs queued up */
- BLKIO_STAT_QUEUED,
-
- /* All the single valued stats go below this */
- BLKIO_STAT_TIME,
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- /* Time not charged to this cgroup */
- BLKIO_STAT_UNACCOUNTED_TIME,
- BLKIO_STAT_AVG_QUEUE_SIZE,
- BLKIO_STAT_IDLE_TIME,
- BLKIO_STAT_EMPTY_TIME,
- BLKIO_STAT_GROUP_WAIT_TIME,
- BLKIO_STAT_DEQUEUE
-#endif
-};
-
-/* Types lower than this live in stat_arr and have subtypes */
-#define BLKIO_STAT_ARR_NR (BLKIO_STAT_QUEUED + 1)
-
-/* Per cpu stats */
-enum stat_type_cpu {
- /* Total bytes transferred */
- BLKIO_STAT_CPU_SERVICE_BYTES,
- /* Total IOs serviced, post merge */
- BLKIO_STAT_CPU_SERVICED,
-
- /* All the single valued stats go below this */
- BLKIO_STAT_CPU_SECTORS,
-};
-
-#define BLKIO_STAT_CPU_ARR_NR (BLKIO_STAT_CPU_SERVICED + 1)
+/* cft->private [un]packing for stat printing */
+#define BLKCG_STAT_PRIV(pol, off) (((unsigned)(pol) << 16) | (off))
+#define BLKCG_STAT_POL(prv) ((unsigned)(prv) >> 16)
+#define BLKCG_STAT_OFF(prv) ((unsigned)(prv) & 0xffff)
enum blkg_rwstat_type {
BLKG_RWSTAT_READ,
@@ -90,20 +54,6 @@ enum blkg_state_flags {
enum blkcg_file_name_prop {
BLKIO_PROP_weight = 1,
BLKIO_PROP_weight_device,
- BLKIO_PROP_io_service_bytes,
- BLKIO_PROP_io_serviced,
- BLKIO_PROP_time,
- BLKIO_PROP_sectors,
- BLKIO_PROP_unaccounted_time,
- BLKIO_PROP_io_service_time,
- BLKIO_PROP_io_wait_time,
- BLKIO_PROP_io_merged,
- BLKIO_PROP_io_queued,
- BLKIO_PROP_avg_queue_size,
- BLKIO_PROP_group_wait_time,
- BLKIO_PROP_idle_time,
- BLKIO_PROP_empty_time,
- BLKIO_PROP_dequeue,
};
/* cgroup files owned by throttle policy */
@@ -112,8 +62,6 @@ enum blkcg_file_name_throtl {
BLKIO_THROTL_write_bps_device,
BLKIO_THROTL_read_iops_device,
BLKIO_THROTL_write_iops_device,
- BLKIO_THROTL_io_service_bytes,
- BLKIO_THROTL_io_serviced,
};
struct blkio_cgroup {