lkml.org 
[lkml]   [2012]   [Mar]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 18/21] blkcg: move blkio_group_conf->weight to cfq
Date
blkio_group_conf->weight is owned by cfq and has no reason to be
defined in blkcg core. Replace it with cfq_group->dev_weight and let
conf setting functions directly set it. If dev_weight is zero, the
cfqg doesn't have device specific weight configured.

Also, rename BLKIO_WEIGHT_* constants to CFQ_WEIGHT_* and rename
blkio_cgroup->weight to blkio_cgroup->cfq_weight. We eventually want
per-policy storage in blkio_cgroup but just mark the ownership of the
field for now.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/blk-cgroup.c | 4 +-
block/blk-cgroup.h | 14 +++++----
block/cfq-iosched.c | 77 +++++++++++++++++++++++---------------------------
3 files changed, 45 insertions(+), 50 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 0b4b765..7688aef 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -30,7 +30,7 @@ static LIST_HEAD(blkio_list);
static DEFINE_MUTEX(all_q_mutex);
static LIST_HEAD(all_q_list);

-struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
+struct blkio_cgroup blkio_root_cgroup = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT };
EXPORT_SYMBOL_GPL(blkio_root_cgroup);

static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES];
@@ -611,7 +611,7 @@ static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup)
if (!blkcg)
return ERR_PTR(-ENOMEM);

- blkcg->weight = BLKIO_WEIGHT_DEFAULT;
+ blkcg->cfq_weight = CFQ_WEIGHT_DEFAULT;
blkcg->id = atomic64_inc_return(&id_seq); /* root is 0, start from 1 */
done:
spin_lock_init(&blkcg->lock);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index e368dd00..386db29 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -29,6 +29,11 @@ enum blkio_policy_id {

#ifdef CONFIG_BLK_CGROUP

+/* CFQ specific, out here for blkcg->cfq_weight */
+#define CFQ_WEIGHT_MIN 10
+#define CFQ_WEIGHT_MAX 1000
+#define CFQ_WEIGHT_DEFAULT 500
+
/* 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)
@@ -46,12 +51,14 @@ enum blkg_rwstat_type {

struct blkio_cgroup {
struct cgroup_subsys_state css;
- unsigned int weight;
spinlock_t lock;
struct hlist_head blkg_list;

/* for policies to test whether associated blkcg has changed */
uint64_t id;
+
+ /* TODO: per-policy storage in blkio_cgroup */
+ unsigned int cfq_weight; /* belongs to cfq */
};

struct blkg_stat {
@@ -65,7 +72,6 @@ struct blkg_rwstat {
};

struct blkio_group_conf {
- unsigned int weight;
u64 iops[2];
u64 bps[2];
};
@@ -355,10 +361,6 @@ static inline void blkg_put(struct blkio_group *blkg) { }

#endif

-#define BLKIO_WEIGHT_MIN 10
-#define BLKIO_WEIGHT_MAX 1000
-#define BLKIO_WEIGHT_DEFAULT 500
-
#ifdef CONFIG_BLK_CGROUP
extern struct blkio_cgroup blkio_root_cgroup;
extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index a1f37df..adab10d 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -224,7 +224,7 @@ struct cfq_group {
u64 vdisktime;
unsigned int weight;
unsigned int new_weight;
- bool needs_update;
+ unsigned int dev_weight;

/* number of cfqq currently on this group */
int nr_cfqq;
@@ -838,7 +838,7 @@ static inline u64 cfq_scale_slice(unsigned long delta, struct cfq_group *cfqg)
{
u64 d = delta << CFQ_SERVICE_SHIFT;

- d = d * BLKIO_WEIGHT_DEFAULT;
+ d = d * CFQ_WEIGHT_DEFAULT;
do_div(d, cfqg->weight);
return d;
}
@@ -1165,9 +1165,9 @@ static void
cfq_update_group_weight(struct cfq_group *cfqg)
{
BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
- if (cfqg->needs_update) {
+ if (cfqg->new_weight) {
cfqg->weight = cfqg->new_weight;
- cfqg->needs_update = false;
+ cfqg->new_weight = 0;
}
}

@@ -1325,21 +1325,12 @@ static void cfq_init_cfqg_base(struct cfq_group *cfqg)
}

#ifdef CONFIG_CFQ_GROUP_IOSCHED
-static void cfq_update_blkio_group_weight(struct blkio_group *blkg,
- unsigned int weight)
-{
- struct cfq_group *cfqg = blkg_to_cfqg(blkg);
-
- cfqg->new_weight = weight;
- cfqg->needs_update = true;
-}
-
static void cfq_init_blkio_group(struct blkio_group *blkg)
{
struct cfq_group *cfqg = blkg_to_cfqg(blkg);

cfq_init_cfqg_base(cfqg);
- cfqg->weight = blkg->blkcg->weight;
+ cfqg->weight = blkg->blkcg->cfq_weight;
}

/*
@@ -1377,36 +1368,38 @@ static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg)
cfqg_get(cfqg);
}

-static u64 blkg_prfill_weight_device(struct seq_file *sf,
+static u64 cfqg_prfill_weight_device(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
{
- if (!pd->conf.weight)
+ struct cfq_group *cfqg = (void *)pd->pdata;
+
+ if (!cfqg->dev_weight)
return 0;
- return __blkg_prfill_u64(sf, pd, pd->conf.weight);
+ return __blkg_prfill_u64(sf, pd, cfqg->dev_weight);
}

-static int blkcg_print_weight_device(struct cgroup *cgrp, struct cftype *cft,
- struct seq_file *sf)
+static int cfqg_print_weight_device(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
blkcg_print_blkgs(sf, cgroup_to_blkio_cgroup(cgrp),
- blkg_prfill_weight_device, BLKIO_POLICY_PROP, 0,
+ cfqg_prfill_weight_device, BLKIO_POLICY_PROP, 0,
false);
return 0;
}

-static int blkcg_print_weight(struct cgroup *cgrp, struct cftype *cft,
- struct seq_file *sf)
+static int cfq_print_weight(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
- seq_printf(sf, "%u\n", cgroup_to_blkio_cgroup(cgrp)->weight);
+ seq_printf(sf, "%u\n", cgroup_to_blkio_cgroup(cgrp)->cfq_weight);
return 0;
}

-static int blkcg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
- const char *buf)
+static int cfqg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
+ const char *buf)
{
struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
- struct blkg_policy_data *pd;
struct blkg_conf_ctx ctx;
+ struct cfq_group *cfqg;
int ret;

ret = blkg_conf_prep(blkcg, buf, &ctx);
@@ -1414,11 +1407,11 @@ static int blkcg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
return ret;

ret = -EINVAL;
- pd = ctx.blkg->pd[BLKIO_POLICY_PROP];
- if (pd && (!ctx.v || (ctx.v >= BLKIO_WEIGHT_MIN &&
- ctx.v <= BLKIO_WEIGHT_MAX))) {
- pd->conf.weight = ctx.v;
- cfq_update_blkio_group_weight(ctx.blkg, ctx.v ?: blkcg->weight);
+ cfqg = blkg_to_cfqg(ctx.blkg);
+ if (cfqg && (!ctx.v || (ctx.v >= CFQ_WEIGHT_MIN &&
+ ctx.v <= CFQ_WEIGHT_MAX))) {
+ cfqg->dev_weight = ctx.v;
+ cfqg->new_weight = cfqg->dev_weight ?: blkcg->cfq_weight;
ret = 0;
}

@@ -1426,23 +1419,23 @@ static int blkcg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
return ret;
}

-static int blkcg_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val)
+static int cfq_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val)
{
struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
struct blkio_group *blkg;
struct hlist_node *n;

- if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX)
+ if (val < CFQ_WEIGHT_MIN || val > CFQ_WEIGHT_MAX)
return -EINVAL;

spin_lock_irq(&blkcg->lock);
- blkcg->weight = (unsigned int)val;
+ blkcg->cfq_weight = (unsigned int)val;

hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
- struct blkg_policy_data *pd = blkg->pd[BLKIO_POLICY_PROP];
+ struct cfq_group *cfqg = blkg_to_cfqg(blkg);

- if (pd && !pd->conf.weight)
- cfq_update_blkio_group_weight(blkg, blkcg->weight);
+ if (cfqg && !cfqg->dev_weight)
+ cfqg->new_weight = blkcg->cfq_weight;
}

spin_unlock_irq(&blkcg->lock);
@@ -1480,14 +1473,14 @@ static int cfqg_print_avg_queue_size(struct cgroup *cgrp, struct cftype *cft,
static struct cftype cfq_blkcg_files[] = {
{
.name = "weight_device",
- .read_seq_string = blkcg_print_weight_device,
- .write_string = blkcg_set_weight_device,
+ .read_seq_string = cfqg_print_weight_device,
+ .write_string = cfqg_set_weight_device,
.max_write_len = 256,
},
{
.name = "weight",
- .read_seq_string = blkcg_print_weight,
- .write_u64 = blkcg_set_weight,
+ .read_seq_string = cfq_print_weight,
+ .write_u64 = cfq_set_weight,
},
{
.name = "time",
@@ -3983,7 +3976,7 @@ static int cfq_init_queue(struct request_queue *q)
return -ENOMEM;
}

- cfqd->root_group->weight = 2*BLKIO_WEIGHT_DEFAULT;
+ cfqd->root_group->weight = 2 * CFQ_WEIGHT_DEFAULT;

/*
* Not strictly needed (since RB_ROOT just clears the node and we
--
1.7.7.3


\
 
 \ /
  Last update: 2012-03-29 00:57    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean