forked from luck/tmp_suning_uos_patched
df457f845e
We've found that we still get good, useful isolation at weights this low. I'd like to adjust the minimum so that any other changes can take these values into account. Signed-off-by: Justin TerAvest <teravest@google.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
336 lines
10 KiB
C
336 lines
10 KiB
C
#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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enum blkio_policy_id {
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BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
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BLKIO_POLICY_THROTL, /* Throttling */
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};
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/* Max limits for throttle policy */
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#define THROTL_IOPS_MAX UINT_MAX
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#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
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#ifndef CONFIG_BLK_CGROUP
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/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
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extern struct cgroup_subsys blkio_subsys;
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#define blkio_subsys_id blkio_subsys.subsys_id
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#endif
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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 bytes transferred */
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BLKIO_STAT_SERVICE_BYTES,
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/* Total IOs serviced, post merge */
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BLKIO_STAT_SERVICED,
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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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/* Number of IOs merged */
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BLKIO_STAT_MERGED,
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/* Number of IOs queued up */
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BLKIO_STAT_QUEUED,
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/* All the single valued stats go below this */
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BLKIO_STAT_TIME,
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BLKIO_STAT_SECTORS,
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#ifdef CONFIG_DEBUG_BLK_CGROUP
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BLKIO_STAT_AVG_QUEUE_SIZE,
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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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BLKIO_STAT_DEQUEUE
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#endif
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};
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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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};
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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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/* 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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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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/* 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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BLKIO_THROTL_read_iops_device,
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BLKIO_THROTL_write_iops_device,
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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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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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struct list_head policy_list; /* list of blkio_policy_node */
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};
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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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uint64_t sectors;
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uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
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#ifdef CONFIG_DEBUG_BLK_CGROUP
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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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/* How many times this group has been removed from service tree */
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unsigned long dequeue;
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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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#endif
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};
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struct blkio_group {
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/* An rcu protected unique identifier for the group */
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void *key;
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struct hlist_node blkcg_node;
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unsigned short blkcg_id;
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/* Store cgroup path */
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char path[128];
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/* The device MKDEV(major, minor), this group has been created for */
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dev_t dev;
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/* policy which owns this blk group */
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enum blkio_policy_id plid;
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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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};
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struct blkio_policy_node {
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struct list_head node;
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dev_t dev;
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/* This node belongs to max bw policy or porportional weight policy */
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enum blkio_policy_id plid;
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/* cgroup file to which this rule belongs to */
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int fileid;
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union {
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unsigned int weight;
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/*
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* Rate read/write in terms of byptes per second
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* Whether this rate represents read or write is determined
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* by file type "fileid".
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*/
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u64 bps;
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unsigned int iops;
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} val;
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};
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extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
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dev_t dev);
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extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
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dev_t dev);
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extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
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dev_t dev);
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extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
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dev_t dev);
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extern unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg,
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dev_t dev);
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typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
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typedef void (blkio_update_group_weight_fn) (void *key,
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struct blkio_group *blkg, unsigned int weight);
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typedef void (blkio_update_group_read_bps_fn) (void * key,
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struct blkio_group *blkg, u64 read_bps);
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typedef void (blkio_update_group_write_bps_fn) (void *key,
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struct blkio_group *blkg, u64 write_bps);
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typedef void (blkio_update_group_read_iops_fn) (void *key,
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struct blkio_group *blkg, unsigned int read_iops);
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typedef void (blkio_update_group_write_iops_fn) (void *key,
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struct blkio_group *blkg, unsigned int write_iops);
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struct blkio_policy_ops {
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blkio_unlink_group_fn *blkio_unlink_group_fn;
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blkio_update_group_weight_fn *blkio_update_group_weight_fn;
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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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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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};
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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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enum blkio_policy_id plid;
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};
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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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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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#else
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struct blkio_group {
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};
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struct blkio_policy_type {
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};
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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) { }
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static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
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#endif
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#define BLKIO_WEIGHT_MIN 10
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#define BLKIO_WEIGHT_MAX 1000
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#define BLKIO_WEIGHT_DEFAULT 500
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#ifdef CONFIG_DEBUG_BLK_CGROUP
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void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
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void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
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unsigned long dequeue);
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void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
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void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
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void blkiocg_set_start_empty_time(struct blkio_group *blkg);
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#define BLKG_FLAG_FNS(name) \
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static inline void blkio_mark_blkg_##name( \
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struct blkio_group_stats *stats) \
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{ \
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stats->flags |= (1 << BLKG_##name); \
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} \
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static inline void blkio_clear_blkg_##name( \
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struct blkio_group_stats *stats) \
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{ \
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stats->flags &= ~(1 << BLKG_##name); \
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} \
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static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
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{ \
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return (stats->flags & (1 << BLKG_##name)) != 0; \
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} \
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BLKG_FLAG_FNS(waiting)
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BLKG_FLAG_FNS(idling)
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BLKG_FLAG_FNS(empty)
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#undef BLKG_FLAG_FNS
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#else
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static inline void blkiocg_update_avg_queue_size_stats(
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struct blkio_group *blkg) {}
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static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
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unsigned long dequeue) {}
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static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
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{}
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static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
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static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
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#endif
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#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
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extern struct blkio_cgroup blkio_root_cgroup;
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extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
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extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
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struct blkio_group *blkg, void *key, dev_t dev,
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enum blkio_policy_id plid);
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extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
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extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
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void *key);
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void blkiocg_update_timeslice_used(struct blkio_group *blkg,
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unsigned long time);
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void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
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bool direction, bool sync);
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void blkiocg_update_completion_stats(struct blkio_group *blkg,
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uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
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void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
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bool sync);
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void blkiocg_update_io_add_stats(struct blkio_group *blkg,
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struct blkio_group *curr_blkg, bool direction, bool sync);
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void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
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bool direction, bool sync);
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#else
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struct cgroup;
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static inline struct blkio_cgroup *
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cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
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static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
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struct blkio_group *blkg, void *key, dev_t dev,
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enum blkio_policy_id plid) {}
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static inline int
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blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
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static inline struct blkio_group *
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blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
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static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
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unsigned long time) {}
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static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
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uint64_t bytes, bool direction, bool sync) {}
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static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
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uint64_t start_time, uint64_t io_start_time, bool direction,
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bool sync) {}
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static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
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bool direction, bool sync) {}
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static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
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struct blkio_group *curr_blkg, bool direction, bool sync) {}
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static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
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bool direction, bool sync) {}
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#endif
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#endif /* _BLK_CGROUP_H */
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