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Commit 4c9eefa1 authored by Vivek Goyal's avatar Vivek Goyal Committed by Jens Axboe
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blk-cgroup: Introduce cgroup changes for throttling policy 



o cgroup chagnes for throttle policy.

o Introduces READ and WRITE bytes per second throttling rules.

Signed-off-by: default avatarVivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 062a644d

block/blk-cgroup.c

+138 −7
Original line number Diff line number Diff line
@@ -128,6 +128,27 @@ blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) 
	}

}



static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps,

				int fileid)

{

	struct blkio_policy_type *blkiop;



	list_for_each_entry(blkiop, &blkio_list, list) {



		/* If this policy does not own the blkg, do not send updates */

		if (blkiop->plid != blkg->plid)

			continue;



		if (fileid == BLKIO_THROTL_read_bps_device

		    && blkiop->ops.blkio_update_group_read_bps_fn)

			blkiop->ops.blkio_update_group_read_bps_fn(blkg, bps);



		if (fileid == BLKIO_THROTL_write_bps_device

		    && blkiop->ops.blkio_update_group_write_bps_fn)

			blkiop->ops.blkio_update_group_write_bps_fn(blkg, bps);

	}

}



/*

 * Add to the appropriate stat variable depending on the request type.

 * This should be called with the blkg->stats_lock held.
@@ -612,6 +633,7 @@ static int blkio_policy_parse_and_set(char *buf, 
	unsigned long major, minor, temp;

	int i = 0;

	dev_t dev;

	u64 bps;



	memset(s, 0, sizeof(s));
@@ -667,7 +689,16 @@ static int blkio_policy_parse_and_set(char *buf, 


		newpn->plid = plid;

		newpn->fileid = fileid;

		newpn->weight = temp;

		newpn->val.weight = temp;

		break;

	case BLKIO_POLICY_THROTL:

		ret = strict_strtoull(s[1], 10, &bps);

		if (ret)

			return -EINVAL;



		newpn->plid = plid;

		newpn->fileid = fileid;

		newpn->val.bps = bps;

		break;

	default:

		BUG();
@@ -684,18 +715,45 @@ unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, 
	pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP,

				BLKIO_PROP_weight_device);

	if (pn)

		return pn->weight;

		return pn->val.weight;

	else

		return blkcg->weight;

}

EXPORT_SYMBOL_GPL(blkcg_get_weight);



uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev)

{

	struct blkio_policy_node *pn;



	pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,

				BLKIO_THROTL_read_bps_device);

	if (pn)

		return pn->val.bps;

	else

		return -1;

}



uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev)

{

	struct blkio_policy_node *pn;

	pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,

				BLKIO_THROTL_write_bps_device);

	if (pn)

		return pn->val.bps;

	else

		return -1;

}



/* Checks whether user asked for deleting a policy rule */

static bool blkio_delete_rule_command(struct blkio_policy_node *pn)

{

	switch(pn->plid) {

	case BLKIO_POLICY_PROP:

		if (pn->weight == 0)

		if (pn->val.weight == 0)

			return 1;

		break;

	case BLKIO_POLICY_THROTL:

		if (pn->val.bps == 0)

			return 1;

		break;

	default:
@@ -710,7 +768,10 @@ static void blkio_update_policy_rule(struct blkio_policy_node *oldpn, 
{

	switch(oldpn->plid) {

	case BLKIO_POLICY_PROP:

		oldpn->weight = newpn->weight;

		oldpn->val.weight = newpn->val.weight;

		break;

	case BLKIO_POLICY_THROTL:

		oldpn->val.bps = newpn->val.bps;

		break;

	default:

		BUG();
@@ -725,13 +786,23 @@ static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg, 
		struct blkio_group *blkg, struct blkio_policy_node *pn)

{

	unsigned int weight;

	u64 bps;



	switch(pn->plid) {

	case BLKIO_POLICY_PROP:

		weight = pn->weight ? pn->weight :

		weight = pn->val.weight ? pn->val.weight :

				blkcg->weight;

		blkio_update_group_weight(blkg, weight);

		break;

	case BLKIO_POLICY_THROTL:

		switch(pn->fileid) {

		case BLKIO_THROTL_read_bps_device:

		case BLKIO_THROTL_write_bps_device:

			bps = pn->val.bps ? pn->val.bps : (-1);

			blkio_update_group_bps(blkg, bps, pn->fileid);

			break;

		}

		break;

	default:

		BUG();

	}
@@ -826,7 +897,17 @@ blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn) 
		case BLKIO_POLICY_PROP:

			if (pn->fileid == BLKIO_PROP_weight_device)

				seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev),

					MINOR(pn->dev), pn->weight);

					MINOR(pn->dev), pn->val.weight);

			break;

		case BLKIO_POLICY_THROTL:

			if (pn->fileid == BLKIO_THROTL_read_bps_device)

				seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev),

					MINOR(pn->dev), pn->val.bps);

			else if (pn->fileid == BLKIO_THROTL_write_bps_device)

				seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev),

					MINOR(pn->dev), pn->val.bps);

			else

				BUG();

			break;

		default:

			BUG();
@@ -869,6 +950,16 @@ static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, 
			BUG();

		}

		break;

	case BLKIO_POLICY_THROTL:

		switch(name){

		case BLKIO_THROTL_read_bps_device:

		case BLKIO_THROTL_write_bps_device:

			blkio_read_policy_node_files(cft, blkcg, m);

			return 0;

		default:

			BUG();

		}

		break;

	default:

		BUG();

	}
@@ -959,7 +1050,18 @@ static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, 
			BUG();

		}

		break;



	case BLKIO_POLICY_THROTL:

		switch(name){

		case BLKIO_THROTL_io_service_bytes:

			return blkio_read_blkg_stats(blkcg, cft, cb,

						BLKIO_STAT_SERVICE_BYTES, 1);

		case BLKIO_THROTL_io_serviced:

			return blkio_read_blkg_stats(blkcg, cft, cb,

						BLKIO_STAT_SERVICED, 1);

		default:

			BUG();

		}

		break;

	default:

		BUG();

	}
@@ -1052,6 +1154,23 @@ struct cftype blkio_files[] = { 
		.read_u64 = blkiocg_file_read_u64,

		.write_u64 = blkiocg_file_write_u64,

	},

	{

		.name = "throttle.read_bps_device",

		.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,

				BLKIO_THROTL_read_bps_device),

		.read_seq_string = blkiocg_file_read,

		.write_string = blkiocg_file_write,

		.max_write_len = 256,

	},



	{

		.name = "throttle.write_bps_device",

		.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,

				BLKIO_THROTL_write_bps_device),

		.read_seq_string = blkiocg_file_read,

		.write_string = blkiocg_file_write,

		.max_write_len = 256,

	},

	{

		.name = "time",

		.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
@@ -1070,12 +1189,24 @@ struct cftype blkio_files[] = { 
				BLKIO_PROP_io_service_bytes),

		.read_map = blkiocg_file_read_map,

	},

	{

		.name = "throttle.io_service_bytes",

		.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,

				BLKIO_THROTL_io_service_bytes),

		.read_map = blkiocg_file_read_map,

	},

	{

		.name = "io_serviced",

		.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,

				BLKIO_PROP_io_serviced),

		.read_map = blkiocg_file_read_map,

	},

	{

		.name = "throttle.io_serviced",

		.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,

				BLKIO_THROTL_io_serviced),

		.read_map = blkiocg_file_read_map,

	},

	{

		.name = "io_service_time",

		.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,

block/blk-cgroup.h

+29 −1
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 


enum blkio_policy_id {

	BLKIO_POLICY_PROP = 0,		/* Proportional Bandwidth division */

	BLKIO_POLICY_THROTL,		/* Throttling */

};



#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
@@ -88,6 +89,14 @@ enum blkcg_file_name_prop { 
	BLKIO_PROP_dequeue,

};



/* cgroup files owned by throttle policy */

enum blkcg_file_name_throtl {

	BLKIO_THROTL_read_bps_device,

	BLKIO_THROTL_write_bps_device,

	BLKIO_THROTL_io_service_bytes,

	BLKIO_THROTL_io_serviced,

};



struct blkio_cgroup {

	struct cgroup_subsys_state css;

	unsigned int weight;
@@ -146,23 +155,42 @@ struct blkio_group { 
struct blkio_policy_node {

	struct list_head node;

	dev_t dev;

	unsigned int weight;

	/* This node belongs to max bw policy or porportional weight policy */

	enum blkio_policy_id plid;

	/* cgroup file to which this rule belongs to */

	int fileid;



	union {

		unsigned int weight;

		/*

		 * Rate read/write in terms of byptes per second

		 * Whether this rate represents read or write is determined

		 * by file type "fileid".

		 */

		u64 bps;

	} val;

};



extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,

				     dev_t dev);

extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,

				     dev_t dev);

extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,

				     dev_t dev);



typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);

typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,

						unsigned int weight);

typedef void (blkio_update_group_read_bps_fn) (struct blkio_group *blkg,

						u64 read_bps);

typedef void (blkio_update_group_write_bps_fn) (struct blkio_group *blkg,

						u64 write_bps);



struct blkio_policy_ops {

	blkio_unlink_group_fn *blkio_unlink_group_fn;

	blkio_update_group_weight_fn *blkio_update_group_weight_fn;

	blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;

	blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;

};



struct blkio_policy_type {