2009-12-04 01:59:42 +08:00
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#ifndef _BLK_CGROUP_H
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#define _BLK_CGROUP_H
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/*
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* Common Block IO controller cgroup interface
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*
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* Based on ideas and code from CFQ, CFS and BFQ:
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* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
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*
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* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
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* Paolo Valente <paolo.valente@unimore.it>
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*
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* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
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* Nauman Rafique <nauman@google.com>
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*/
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#include <linux/cgroup.h>
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2011-05-20 03:38:29 +08:00
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#include <linux/u64_stats_sync.h>
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2009-12-04 01:59:42 +08:00
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2010-09-16 05:06:33 +08:00
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enum blkio_policy_id {
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BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
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2010-09-16 05:06:34 +08:00
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BLKIO_POLICY_THROTL, /* Throttling */
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2012-03-06 05:15:04 +08:00
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BLKIO_NR_POLICIES,
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2010-09-16 05:06:33 +08:00
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};
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2010-10-02 03:16:41 +08:00
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/* Max limits for throttle policy */
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#define THROTL_IOPS_MAX UINT_MAX
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2012-03-06 05:14:54 +08:00
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#ifdef CONFIG_BLK_CGROUP
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2009-12-04 04:06:43 +08:00
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2010-04-09 14:31:19 +08:00
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enum stat_type {
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/* Total time spent (in ns) between request dispatch to the driver and
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* request completion for IOs doen by this cgroup. This may not be
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* accurate when NCQ is turned on. */
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BLKIO_STAT_SERVICE_TIME = 0,
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/* Total time spent waiting in scheduler queue in ns */
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BLKIO_STAT_WAIT_TIME,
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2010-04-09 12:15:10 +08:00
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/* Number of IOs queued up */
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BLKIO_STAT_QUEUED,
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2010-04-09 14:31:19 +08:00
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/* All the single valued stats go below this */
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BLKIO_STAT_TIME,
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2011-05-20 03:38:20 +08:00
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#ifdef CONFIG_DEBUG_BLK_CGROUP
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2011-03-12 23:54:00 +08:00
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/* Time not charged to this cgroup */
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BLKIO_STAT_UNACCOUNTED_TIME,
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2010-04-09 12:15:10 +08:00
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BLKIO_STAT_AVG_QUEUE_SIZE,
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2010-04-09 12:15:35 +08:00
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BLKIO_STAT_IDLE_TIME,
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BLKIO_STAT_EMPTY_TIME,
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BLKIO_STAT_GROUP_WAIT_TIME,
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2010-04-09 14:31:19 +08:00
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BLKIO_STAT_DEQUEUE
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#endif
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};
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2011-05-20 03:38:28 +08:00
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/* Per cpu stats */
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enum stat_type_cpu {
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BLKIO_STAT_CPU_SECTORS,
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/* Total bytes transferred */
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BLKIO_STAT_CPU_SERVICE_BYTES,
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/* Total IOs serviced, post merge */
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BLKIO_STAT_CPU_SERVICED,
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2011-05-23 16:02:19 +08:00
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/* Number of IOs merged */
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BLKIO_STAT_CPU_MERGED,
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2011-05-20 03:38:28 +08:00
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BLKIO_STAT_CPU_NR
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};
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2010-04-09 14:31:19 +08:00
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enum stat_sub_type {
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BLKIO_STAT_READ = 0,
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BLKIO_STAT_WRITE,
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BLKIO_STAT_SYNC,
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BLKIO_STAT_ASYNC,
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BLKIO_STAT_TOTAL
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2010-04-02 06:01:24 +08:00
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};
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2010-04-09 12:15:35 +08:00
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/* blkg state flags */
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enum blkg_state_flags {
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BLKG_waiting = 0,
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BLKG_idling,
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BLKG_empty,
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};
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2010-09-16 05:06:33 +08:00
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/* cgroup files owned by proportional weight policy */
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enum blkcg_file_name_prop {
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BLKIO_PROP_weight = 1,
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BLKIO_PROP_weight_device,
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BLKIO_PROP_io_service_bytes,
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BLKIO_PROP_io_serviced,
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BLKIO_PROP_time,
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BLKIO_PROP_sectors,
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2011-03-12 23:54:00 +08:00
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BLKIO_PROP_unaccounted_time,
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2010-09-16 05:06:33 +08:00
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BLKIO_PROP_io_service_time,
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BLKIO_PROP_io_wait_time,
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BLKIO_PROP_io_merged,
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BLKIO_PROP_io_queued,
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BLKIO_PROP_avg_queue_size,
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BLKIO_PROP_group_wait_time,
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BLKIO_PROP_idle_time,
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BLKIO_PROP_empty_time,
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BLKIO_PROP_dequeue,
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};
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2010-09-16 05:06:34 +08:00
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/* cgroup files owned by throttle policy */
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enum blkcg_file_name_throtl {
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BLKIO_THROTL_read_bps_device,
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BLKIO_THROTL_write_bps_device,
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2010-09-16 05:06:36 +08:00
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BLKIO_THROTL_read_iops_device,
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BLKIO_THROTL_write_iops_device,
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2010-09-16 05:06:34 +08:00
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BLKIO_THROTL_io_service_bytes,
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BLKIO_THROTL_io_serviced,
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};
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2009-12-04 01:59:42 +08:00
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struct blkio_cgroup {
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struct cgroup_subsys_state css;
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unsigned int weight;
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spinlock_t lock;
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struct hlist_head blkg_list;
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};
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2010-04-02 06:01:24 +08:00
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struct blkio_group_stats {
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/* total disk time and nr sectors dispatched by this group */
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uint64_t time;
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2010-04-09 12:15:10 +08:00
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uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
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2010-04-02 06:01:24 +08:00
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#ifdef CONFIG_DEBUG_BLK_CGROUP
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2011-05-20 03:38:20 +08:00
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/* Time not charged to this cgroup */
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uint64_t unaccounted_time;
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2010-04-09 12:15:10 +08:00
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/* Sum of number of IOs queued across all samples */
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uint64_t avg_queue_size_sum;
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/* Count of samples taken for average */
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uint64_t avg_queue_size_samples;
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2010-04-02 06:01:24 +08:00
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/* How many times this group has been removed from service tree */
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unsigned long dequeue;
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2010-04-09 12:15:35 +08:00
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/* Total time spent waiting for it to be assigned a timeslice. */
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uint64_t group_wait_time;
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uint64_t start_group_wait_time;
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/* Time spent idling for this blkio_group */
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uint64_t idle_time;
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uint64_t start_idle_time;
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/*
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* Total time when we have requests queued and do not contain the
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* current active queue.
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*/
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uint64_t empty_time;
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uint64_t start_empty_time;
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uint16_t flags;
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2010-04-02 06:01:24 +08:00
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#endif
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};
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2011-05-20 03:38:28 +08:00
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/* Per cpu blkio group stats */
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struct blkio_group_stats_cpu {
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uint64_t sectors;
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uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
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2011-05-20 03:38:29 +08:00
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struct u64_stats_sync syncp;
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2011-05-20 03:38:28 +08:00
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};
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2012-03-06 05:15:07 +08:00
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struct blkio_group_conf {
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unsigned int weight;
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unsigned int iops[2];
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u64 bps[2];
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};
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2012-03-06 05:15:14 +08:00
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/* per-blkg per-policy data */
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struct blkg_policy_data {
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/* the blkg this per-policy data belongs to */
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struct blkio_group *blkg;
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/* pol->pdata_size bytes of private data used by policy impl */
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char pdata[] __aligned(__alignof__(unsigned long long));
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};
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2009-12-04 01:59:42 +08:00
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struct blkio_group {
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2012-03-06 05:15:03 +08:00
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/* Pointer to the associated request_queue, RCU protected */
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struct request_queue __rcu *q;
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2009-12-04 01:59:42 +08:00
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struct hlist_node blkcg_node;
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2012-03-06 05:15:11 +08:00
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struct blkio_cgroup *blkcg;
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2009-12-04 01:59:48 +08:00
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/* Store cgroup path */
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char path[128];
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2010-09-16 05:06:33 +08:00
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/* policy which owns this blk group */
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enum blkio_policy_id plid;
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2009-12-04 01:59:49 +08:00
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2012-03-06 05:15:07 +08:00
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/* Configuration */
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struct blkio_group_conf conf;
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2010-04-02 06:01:24 +08:00
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/* Need to serialize the stats in the case of reset/update */
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spinlock_t stats_lock;
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struct blkio_group_stats stats;
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2011-05-20 03:38:28 +08:00
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/* Per cpu stats pointer */
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struct blkio_group_stats_cpu __percpu *stats_cpu;
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2012-03-06 05:15:14 +08:00
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struct blkg_policy_data *pd;
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2009-12-04 01:59:42 +08:00
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};
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2012-03-06 05:15:14 +08:00
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typedef void (blkio_init_group_fn)(struct blkio_group *blkg);
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2012-03-06 05:15:06 +08:00
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typedef void (blkio_link_group_fn)(struct request_queue *q,
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struct blkio_group *blkg);
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2012-03-06 05:15:03 +08:00
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typedef void (blkio_unlink_group_fn)(struct request_queue *q,
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struct blkio_group *blkg);
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2012-03-06 05:15:00 +08:00
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typedef bool (blkio_clear_queue_fn)(struct request_queue *q);
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2012-03-06 05:15:03 +08:00
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typedef void (blkio_update_group_weight_fn)(struct request_queue *q,
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2010-10-01 20:49:49 +08:00
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struct blkio_group *blkg, unsigned int weight);
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2012-03-06 05:15:03 +08:00
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typedef void (blkio_update_group_read_bps_fn)(struct request_queue *q,
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2010-10-01 20:49:49 +08:00
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struct blkio_group *blkg, u64 read_bps);
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2012-03-06 05:15:03 +08:00
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typedef void (blkio_update_group_write_bps_fn)(struct request_queue *q,
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2010-10-01 20:49:49 +08:00
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struct blkio_group *blkg, u64 write_bps);
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2012-03-06 05:15:03 +08:00
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typedef void (blkio_update_group_read_iops_fn)(struct request_queue *q,
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2010-10-01 20:49:49 +08:00
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struct blkio_group *blkg, unsigned int read_iops);
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2012-03-06 05:15:03 +08:00
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typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q,
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2010-10-01 20:49:49 +08:00
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struct blkio_group *blkg, unsigned int write_iops);
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2009-12-04 23:36:42 +08:00
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struct blkio_policy_ops {
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2012-03-06 05:15:14 +08:00
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blkio_init_group_fn *blkio_init_group_fn;
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2012-03-06 05:15:06 +08:00
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blkio_link_group_fn *blkio_link_group_fn;
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2009-12-04 23:36:42 +08:00
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blkio_unlink_group_fn *blkio_unlink_group_fn;
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2012-03-06 05:15:00 +08:00
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blkio_clear_queue_fn *blkio_clear_queue_fn;
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2009-12-04 23:36:42 +08:00
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blkio_update_group_weight_fn *blkio_update_group_weight_fn;
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2010-09-16 05:06:34 +08:00
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blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
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blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
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2010-09-16 05:06:36 +08:00
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blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
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blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
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2009-12-04 23:36:42 +08:00
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};
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struct blkio_policy_type {
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struct list_head list;
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struct blkio_policy_ops ops;
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2010-09-16 05:06:33 +08:00
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enum blkio_policy_id plid;
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2012-03-06 05:15:14 +08:00
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size_t pdata_size; /* policy specific private data size */
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2009-12-04 23:36:42 +08:00
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};
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2012-03-06 05:15:12 +08:00
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extern int blkcg_init_queue(struct request_queue *q);
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extern void blkcg_drain_queue(struct request_queue *q);
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extern void blkcg_exit_queue(struct request_queue *q);
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2009-12-04 23:36:42 +08:00
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/* Blkio controller policy registration */
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extern void blkio_policy_register(struct blkio_policy_type *);
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extern void blkio_policy_unregister(struct blkio_policy_type *);
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2012-03-06 05:15:00 +08:00
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extern void blkg_destroy_all(struct request_queue *q);
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2009-12-04 23:36:42 +08:00
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2012-03-06 05:15:14 +08:00
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/**
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* blkg_to_pdata - get policy private data
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* @blkg: blkg of interest
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* @pol: policy of interest
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*
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* Return pointer to private data associated with the @blkg-@pol pair.
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*/
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static inline void *blkg_to_pdata(struct blkio_group *blkg,
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struct blkio_policy_type *pol)
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{
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return blkg ? blkg->pd->pdata : NULL;
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}
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/**
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* pdata_to_blkg - get blkg associated with policy private data
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* @pdata: policy private data of interest
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* @pol: policy @pdata is for
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*
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* @pdata is policy private data for @pol. Determine the blkg it's
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* associated with.
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*/
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static inline struct blkio_group *pdata_to_blkg(void *pdata,
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struct blkio_policy_type *pol)
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{
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if (pdata) {
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struct blkg_policy_data *pd =
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container_of(pdata, struct blkg_policy_data, pdata);
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return pd->blkg;
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}
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return NULL;
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}
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2010-04-27 01:27:56 +08:00
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static inline char *blkg_path(struct blkio_group *blkg)
|
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|
|
|
{
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|
return blkg->path;
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}
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2009-12-04 04:06:43 +08:00
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|
#else
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struct blkio_group {
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};
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2009-12-04 23:36:42 +08:00
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struct blkio_policy_type {
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};
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2012-03-06 05:15:12 +08:00
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static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
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static inline void blkcg_drain_queue(struct request_queue *q) { }
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static inline void blkcg_exit_queue(struct request_queue *q) { }
|
2009-12-04 23:36:42 +08:00
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static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
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static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
|
2012-03-06 05:15:00 +08:00
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static inline void blkg_destroy_all(struct request_queue *q) { }
|
2009-12-04 23:36:42 +08:00
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|
2012-03-06 05:15:14 +08:00
|
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static inline void *blkg_to_pdata(struct blkio_group *blkg,
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struct blkio_policy_type *pol) { return NULL; }
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|
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|
static inline struct blkio_group *pdata_to_blkg(void *pdata,
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|
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struct blkio_policy_type *pol) { return NULL; }
|
2010-04-27 01:27:56 +08:00
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|
static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
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|
2009-12-04 04:06:43 +08:00
|
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|
#endif
|
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|
2011-03-09 02:45:00 +08:00
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|
#define BLKIO_WEIGHT_MIN 10
|
2009-12-04 01:59:42 +08:00
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|
#define BLKIO_WEIGHT_MAX 1000
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|
#define BLKIO_WEIGHT_DEFAULT 500
|
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|
2009-12-04 01:59:48 +08:00
|
|
|
#ifdef CONFIG_DEBUG_BLK_CGROUP
|
2010-04-14 01:59:17 +08:00
|
|
|
void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
|
2010-04-02 06:01:41 +08:00
|
|
|
void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
|
2009-12-04 01:59:49 +08:00
|
|
|
unsigned long dequeue);
|
2010-04-09 12:15:35 +08:00
|
|
|
void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
|
|
|
|
|
void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
|
2010-04-27 01:25:11 +08:00
|
|
|
void blkiocg_set_start_empty_time(struct blkio_group *blkg);
|
2010-04-09 12:15:35 +08:00
|
|
|
|
|
|
|
|
#define BLKG_FLAG_FNS(name) \
|
|
|
|
|
static inline void blkio_mark_blkg_##name( \
|
|
|
|
|
struct blkio_group_stats *stats) \
|
|
|
|
|
{ \
|
|
|
|
|
stats->flags |= (1 << BLKG_##name); \
|
|
|
|
|
} \
|
|
|
|
|
static inline void blkio_clear_blkg_##name( \
|
|
|
|
|
struct blkio_group_stats *stats) \
|
|
|
|
|
{ \
|
|
|
|
|
stats->flags &= ~(1 << BLKG_##name); \
|
|
|
|
|
} \
|
|
|
|
|
static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
|
|
|
|
|
{ \
|
|
|
|
|
return (stats->flags & (1 << BLKG_##name)) != 0; \
|
|
|
|
|
} \
|
|
|
|
|
|
|
|
|
|
BLKG_FLAG_FNS(waiting)
|
|
|
|
|
BLKG_FLAG_FNS(idling)
|
|
|
|
|
BLKG_FLAG_FNS(empty)
|
|
|
|
|
#undef BLKG_FLAG_FNS
|
2009-12-04 01:59:48 +08:00
|
|
|
#else
|
2010-04-14 01:59:17 +08:00
|
|
|
static inline void blkiocg_update_avg_queue_size_stats(
|
2010-04-09 12:15:10 +08:00
|
|
|
struct blkio_group *blkg) {}
|
2010-04-02 06:01:41 +08:00
|
|
|
static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
|
|
|
|
|
unsigned long dequeue) {}
|
2010-04-09 12:15:35 +08:00
|
|
|
static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
|
|
|
|
|
{}
|
|
|
|
|
static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
|
2010-04-27 01:25:11 +08:00
|
|
|
static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
|
2009-12-04 01:59:48 +08:00
|
|
|
#endif
|
|
|
|
|
|
2012-03-06 05:14:54 +08:00
|
|
|
#ifdef CONFIG_BLK_CGROUP
|
2009-12-04 01:59:42 +08:00
|
|
|
extern struct blkio_cgroup blkio_root_cgroup;
|
|
|
|
|
extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
|
2011-05-16 21:24:08 +08:00
|
|
|
extern struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk);
|
2009-12-04 01:59:42 +08:00
|
|
|
extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
|
2012-03-06 05:15:06 +08:00
|
|
|
extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
|
|
|
|
|
struct request_queue *q,
|
|
|
|
|
enum blkio_policy_id plid);
|
|
|
|
|
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
|
|
|
|
|
struct request_queue *q,
|
|
|
|
|
enum blkio_policy_id plid,
|
|
|
|
|
bool for_root);
|
2010-04-02 06:01:24 +08:00
|
|
|
void blkiocg_update_timeslice_used(struct blkio_group *blkg,
|
2011-03-12 23:54:00 +08:00
|
|
|
unsigned long time,
|
|
|
|
|
unsigned long unaccounted_time);
|
2010-04-09 14:31:19 +08:00
|
|
|
void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
|
|
|
|
|
bool direction, bool sync);
|
|
|
|
|
void blkiocg_update_completion_stats(struct blkio_group *blkg,
|
|
|
|
|
uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
|
2010-04-09 12:14:23 +08:00
|
|
|
void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
|
|
|
|
|
bool sync);
|
2010-04-14 01:59:17 +08:00
|
|
|
void blkiocg_update_io_add_stats(struct blkio_group *blkg,
|
2010-04-09 12:15:10 +08:00
|
|
|
struct blkio_group *curr_blkg, bool direction, bool sync);
|
2010-04-14 01:59:17 +08:00
|
|
|
void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
|
2010-04-09 12:15:10 +08:00
|
|
|
bool direction, bool sync);
|
2009-12-04 01:59:42 +08:00
|
|
|
#else
|
2009-12-04 04:06:43 +08:00
|
|
|
struct cgroup;
|
2009-12-04 01:59:42 +08:00
|
|
|
static inline struct blkio_cgroup *
|
|
|
|
|
cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
|
2011-05-16 21:24:08 +08:00
|
|
|
static inline struct blkio_cgroup *
|
|
|
|
|
task_blkio_cgroup(struct task_struct *tsk) { return NULL; }
|
2009-12-04 01:59:42 +08:00
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
|
blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
|
|
|
|
|
|
2012-03-06 05:15:06 +08:00
|
|
|
static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
|
|
|
|
|
void *key) { return NULL; }
|
2010-04-02 06:01:24 +08:00
|
|
|
static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
|
2011-03-12 23:54:00 +08:00
|
|
|
unsigned long time,
|
|
|
|
|
unsigned long unaccounted_time)
|
|
|
|
|
{}
|
2010-04-09 14:31:19 +08:00
|
|
|
static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
|
|
|
|
|
uint64_t bytes, bool direction, bool sync) {}
|
|
|
|
|
static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
|
|
|
|
|
uint64_t start_time, uint64_t io_start_time, bool direction,
|
|
|
|
|
bool sync) {}
|
2010-04-09 12:14:23 +08:00
|
|
|
static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
|
|
|
|
|
bool direction, bool sync) {}
|
2010-04-14 01:59:17 +08:00
|
|
|
static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
|
2010-04-09 12:15:10 +08:00
|
|
|
struct blkio_group *curr_blkg, bool direction, bool sync) {}
|
2010-04-14 01:59:17 +08:00
|
|
|
static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
|
2010-04-09 12:15:10 +08:00
|
|
|
bool direction, bool sync) {}
|
2009-12-04 01:59:42 +08:00
|
|
|
#endif
|
|
|
|
|
#endif /* _BLK_CGROUP_H */
|
