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blkcg: make blkg->pd an array and move configuration and stats into it 

To prepare for unifying blkgs for different policies, make blkg->pd an
array with BLKIO_NR_POLICIES elements and move blkg->conf, ->stats,
and ->stats_cpu into blkg_policy_data.

This patch doesn't introduce any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2012-03-05 13:15:16 -08:00 committed by Jens Axboe
parent 1adaf3dde3
commit 549d3aa872
2 changed files with 102 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

150
block/blk-cgroup.c
View File

@ -184,12 +184,14 @@ static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync)
static void blkio_set_start_group_wait_time(struct blkio_group *blkg,
struct blkio_group *curr_blkg)
{
if (blkio_blkg_waiting(&blkg->stats))
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
if (blkio_blkg_waiting(&pd->stats))
return;
if (blkg == curr_blkg)
return;
blkg->stats.start_group_wait_time = sched_clock();
blkio_mark_blkg_waiting(&blkg->stats);
pd->stats.start_group_wait_time = sched_clock();
blkio_mark_blkg_waiting(&pd->stats);
}
/* This should be called with the blkg->stats_lock held. */
@ -222,24 +224,26 @@ static void blkio_end_empty_time(struct blkio_group_stats *stats)
void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
unsigned long flags;
spin_lock_irqsave(&blkg->stats_lock, flags);
BUG_ON(blkio_blkg_idling(&blkg->stats));
blkg->stats.start_idle_time = sched_clock();
blkio_mark_blkg_idling(&blkg->stats);
BUG_ON(blkio_blkg_idling(&pd->stats));
pd->stats.start_idle_time = sched_clock();
blkio_mark_blkg_idling(&pd->stats);
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats);
void blkiocg_update_idle_time_stats(struct blkio_group *blkg)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
unsigned long flags;
unsigned long long now;
struct blkio_group_stats *stats;
spin_lock_irqsave(&blkg->stats_lock, flags);
stats = &blkg->stats;
stats = &pd->stats;
if (blkio_blkg_idling(stats)) {
now = sched_clock();
if (time_after64(now, stats->start_idle_time))
@ -252,11 +256,12 @@ EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats);
void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
unsigned long flags;
struct blkio_group_stats *stats;
spin_lock_irqsave(&blkg->stats_lock, flags);
stats = &blkg->stats;
stats = &pd->stats;
stats->avg_queue_size_sum +=
stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] +
stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE];
@ -268,11 +273,12 @@ EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats);
void blkiocg_set_start_empty_time(struct blkio_group *blkg)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
unsigned long flags;
struct blkio_group_stats *stats;
spin_lock_irqsave(&blkg->stats_lock, flags);
stats = &blkg->stats;
stats = &pd->stats;
if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] ||
stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) {
@ -299,7 +305,9 @@ EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time);
void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
unsigned long dequeue)
{
blkg->stats.dequeue += dequeue;
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
pd->stats.dequeue += dequeue;
}
EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats);
#else
@ -312,12 +320,13 @@ void blkiocg_update_io_add_stats(struct blkio_group *blkg,
struct blkio_group *curr_blkg, bool direction,
bool sync)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
unsigned long flags;
spin_lock_irqsave(&blkg->stats_lock, flags);
blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction,
blkio_add_stat(pd->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction,
sync);
blkio_end_empty_time(&blkg->stats);
blkio_end_empty_time(&pd->stats);
blkio_set_start_group_wait_time(blkg, curr_blkg);
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
@ -326,10 +335,11 @@ EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats);
void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
bool direction, bool sync)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
unsigned long flags;
spin_lock_irqsave(&blkg->stats_lock, flags);
blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED],
blkio_check_and_dec_stat(pd->stats.stat_arr[BLKIO_STAT_QUEUED],
direction, sync);
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
@ -338,12 +348,13 @@ EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats);
void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time,
unsigned long unaccounted_time)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
unsigned long flags;
spin_lock_irqsave(&blkg->stats_lock, flags);
blkg->stats.time += time;
pd->stats.time += time;
#ifdef CONFIG_DEBUG_BLK_CGROUP
blkg->stats.unaccounted_time += unaccounted_time;
pd->stats.unaccounted_time += unaccounted_time;
#endif
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
@ -356,6 +367,7 @@ EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used);
void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
uint64_t bytes, bool direction, bool sync)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
struct blkio_group_stats_cpu *stats_cpu;
unsigned long flags;
@ -366,7 +378,7 @@ void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
*/
local_irq_save(flags);
stats_cpu = this_cpu_ptr(blkg->stats_cpu);
stats_cpu = this_cpu_ptr(pd->stats_cpu);
u64_stats_update_begin(&stats_cpu->syncp);
stats_cpu->sectors += bytes >> 9;
@ -382,12 +394,13 @@ EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats);
void blkiocg_update_completion_stats(struct blkio_group *blkg,
uint64_t start_time, uint64_t io_start_time, bool direction, bool sync)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
struct blkio_group_stats *stats;
unsigned long flags;
unsigned long long now = sched_clock();
spin_lock_irqsave(&blkg->stats_lock, flags);
stats = &blkg->stats;
stats = &pd->stats;
if (time_after64(now, io_start_time))
blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME],
now - io_start_time, direction, sync);
@ -402,6 +415,7 @@ EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats);
void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
bool sync)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
struct blkio_group_stats_cpu *stats_cpu;
unsigned long flags;
@ -412,7 +426,7 @@ void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
*/
local_irq_save(flags);
stats_cpu = this_cpu_ptr(blkg->stats_cpu);
stats_cpu = this_cpu_ptr(pd->stats_cpu);
u64_stats_update_begin(&stats_cpu->syncp);
blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_MERGED], 1,
@ -430,11 +444,17 @@ EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats);
*/
static void blkg_free(struct blkio_group *blkg)
{
if (blkg) {
free_percpu(blkg->stats_cpu);
kfree(blkg->pd);
kfree(blkg);
struct blkg_policy_data *pd;
if (!blkg)
return;
pd = blkg->pd[blkg->plid];
if (pd) {
free_percpu(pd->stats_cpu);
kfree(pd);
}
kfree(blkg);
}
/**
@ -453,6 +473,7 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
struct blkio_policy_type *pol)
{
struct blkio_group *blkg;
struct blkg_policy_data *pd;
/* alloc and init base part */
blkg = kzalloc_node(sizeof(*blkg), GFP_ATOMIC, q->node);
@ -466,23 +487,26 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
blkg->refcnt = 1;
cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
/* alloc per-policy data */
blkg->pd = kzalloc_node(sizeof(*blkg->pd) + pol->pdata_size, GFP_ATOMIC,
q->node);
if (!blkg->pd) {
/* alloc per-policy data and attach it to blkg */
pd = kzalloc_node(sizeof(*pd) + pol->pdata_size, GFP_ATOMIC,
q->node);
if (!pd) {
blkg_free(blkg);
return NULL;
}
blkg->pd[pol->plid] = pd;
pd->blkg = blkg;
/* broken, read comment in the callsite */
blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
if (!blkg->stats_cpu) {
pd->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
if (!pd->stats_cpu) {
blkg_free(blkg);
return NULL;
}
/* attach pd to blkg and invoke per-policy init */
blkg->pd->blkg = blkg;
/* invoke per-policy init */
pol->ops.blkio_init_group_fn(blkg);
return blkg;
}
@ -659,6 +683,7 @@ EXPORT_SYMBOL_GPL(__blkg_release);
static void blkio_reset_stats_cpu(struct blkio_group *blkg)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
struct blkio_group_stats_cpu *stats_cpu;
int i, j, k;
/*
@ -673,7 +698,7 @@ static void blkio_reset_stats_cpu(struct blkio_group *blkg)
* unless this becomes a real issue.
*/
for_each_possible_cpu(i) {
stats_cpu = per_cpu_ptr(blkg->stats_cpu, i);
stats_cpu = per_cpu_ptr(pd->stats_cpu, i);
stats_cpu->sectors = 0;
for(j = 0; j < BLKIO_STAT_CPU_NR; j++)
for (k = 0; k < BLKIO_STAT_TOTAL; k++)
@ -698,8 +723,10 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
blkcg = cgroup_to_blkio_cgroup(cgroup);
spin_lock_irq(&blkcg->lock);
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
spin_lock(&blkg->stats_lock);
stats = &blkg->stats;
stats = &pd->stats;
#ifdef CONFIG_DEBUG_BLK_CGROUP
idling = blkio_blkg_idling(stats);
waiting = blkio_blkg_waiting(stats);
@ -779,13 +806,14 @@ static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val,
static uint64_t blkio_read_stat_cpu(struct blkio_group *blkg,
enum stat_type_cpu type, enum stat_sub_type sub_type)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
int cpu;
struct blkio_group_stats_cpu *stats_cpu;
u64 val = 0, tval;
for_each_possible_cpu(cpu) {
unsigned int start;
stats_cpu = per_cpu_ptr(blkg->stats_cpu, cpu);
stats_cpu = per_cpu_ptr(pd->stats_cpu, cpu);
do {
start = u64_stats_fetch_begin(&stats_cpu->syncp);
@ -837,20 +865,21 @@ static uint64_t blkio_get_stat(struct blkio_group *blkg,
struct cgroup_map_cb *cb, const char *dname,
enum stat_type type)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
uint64_t disk_total;
char key_str[MAX_KEY_LEN];
enum stat_sub_type sub_type;
if (type == BLKIO_STAT_TIME)
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
blkg->stats.time, cb, dname);
pd->stats.time, cb, dname);
#ifdef CONFIG_DEBUG_BLK_CGROUP
if (type == BLKIO_STAT_UNACCOUNTED_TIME)
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
blkg->stats.unaccounted_time, cb, dname);
pd->stats.unaccounted_time, cb, dname);
if (type == BLKIO_STAT_AVG_QUEUE_SIZE) {
uint64_t sum = blkg->stats.avg_queue_size_sum;
uint64_t samples = blkg->stats.avg_queue_size_samples;
uint64_t sum = pd->stats.avg_queue_size_sum;
uint64_t samples = pd->stats.avg_queue_size_samples;
if (samples)
do_div(sum, samples);
else
@ -860,26 +889,26 @@ static uint64_t blkio_get_stat(struct blkio_group *blkg,
}
if (type == BLKIO_STAT_GROUP_WAIT_TIME)
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
blkg->stats.group_wait_time, cb, dname);
pd->stats.group_wait_time, cb, dname);
if (type == BLKIO_STAT_IDLE_TIME)
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
blkg->stats.idle_time, cb, dname);
pd->stats.idle_time, cb, dname);
if (type == BLKIO_STAT_EMPTY_TIME)
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
blkg->stats.empty_time, cb, dname);
pd->stats.empty_time, cb, dname);
if (type == BLKIO_STAT_DEQUEUE)
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
blkg->stats.dequeue, cb, dname);
pd->stats.dequeue, cb, dname);
#endif
for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL;
sub_type++) {
blkio_get_key_name(sub_type, dname, key_str, MAX_KEY_LEN,
false);
cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]);
cb->fill(cb, key_str, pd->stats.stat_arr[type][sub_type]);
}
disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] +
blkg->stats.stat_arr[type][BLKIO_STAT_WRITE];
disk_total = pd->stats.stat_arr[type][BLKIO_STAT_READ] +
pd->stats.stat_arr[type][BLKIO_STAT_WRITE];
blkio_get_key_name(BLKIO_STAT_TOTAL, dname, key_str, MAX_KEY_LEN,
false);
cb->fill(cb, key_str, disk_total);
@ -891,6 +920,7 @@ static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid,
{
struct gendisk *disk = NULL;
struct blkio_group *blkg = NULL;
struct blkg_policy_data *pd;
char *s[4], *p, *major_s = NULL, *minor_s = NULL;
unsigned long major, minor;
int i = 0, ret = -EINVAL;
@ -950,35 +980,37 @@ static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid,
goto out_unlock;
}
pd = blkg->pd[plid];
switch (plid) {
case BLKIO_POLICY_PROP:
if ((temp < BLKIO_WEIGHT_MIN && temp > 0) ||
temp > BLKIO_WEIGHT_MAX)
goto out_unlock;
blkg->conf.weight = temp;
pd->conf.weight = temp;
blkio_update_group_weight(blkg, temp ?: blkcg->weight);
break;
case BLKIO_POLICY_THROTL:
switch(fileid) {
case BLKIO_THROTL_read_bps_device:
blkg->conf.bps[READ] = temp;
pd->conf.bps[READ] = temp;
blkio_update_group_bps(blkg, temp ?: -1, fileid);
break;
case BLKIO_THROTL_write_bps_device:
blkg->conf.bps[WRITE] = temp;
pd->conf.bps[WRITE] = temp;
blkio_update_group_bps(blkg, temp ?: -1, fileid);
break;
case BLKIO_THROTL_read_iops_device:
if (temp > THROTL_IOPS_MAX)
goto out_unlock;
blkg->conf.iops[READ] = temp;
pd->conf.iops[READ] = temp;
blkio_update_group_iops(blkg, temp ?: -1, fileid);
break;
case BLKIO_THROTL_write_iops_device:
if (temp > THROTL_IOPS_MAX)
goto out_unlock;
blkg->conf.iops[WRITE] = temp;
pd->conf.iops[WRITE] = temp;
blkio_update_group_iops(blkg, temp ?: -1, fileid);
break;
}
@ -1034,6 +1066,7 @@ static const char *blkg_dev_name(struct blkio_group *blkg)
static void blkio_print_group_conf(struct cftype *cft, struct blkio_group *blkg,
struct seq_file *m)
{
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
const char *dname = blkg_dev_name(blkg);
int fileid = BLKIOFILE_ATTR(cft->private);
int rw = WRITE;
@ -1043,25 +1076,25 @@ static void blkio_print_group_conf(struct cftype *cft, struct blkio_group *blkg,
switch (blkg->plid) {
case BLKIO_POLICY_PROP:
if (blkg->conf.weight)
if (pd->conf.weight)
seq_printf(m, "%s\t%u\n",
dname, blkg->conf.weight);
dname, pd->conf.weight);
break;
case BLKIO_POLICY_THROTL:
switch (fileid) {
case BLKIO_THROTL_read_bps_device:
rw = READ;
case BLKIO_THROTL_write_bps_device:
if (blkg->conf.bps[rw])
if (pd->conf.bps[rw])
seq_printf(m, "%s\t%llu\n",
dname, blkg->conf.bps[rw]);
dname, pd->conf.bps[rw]);
break;
case BLKIO_THROTL_read_iops_device:
rw = READ;
case BLKIO_THROTL_write_iops_device:
if (blkg->conf.iops[rw])
if (pd->conf.iops[rw])
seq_printf(m, "%s\t%u\n",
dname, blkg->conf.iops[rw]);
dname, pd->conf.iops[rw]);
break;
}
break;
@ -1243,9 +1276,12 @@ static int blkio_weight_write(struct blkio_cgroup *blkcg, int plid, u64 val)
spin_lock_irq(&blkcg->lock);
blkcg->weight = (unsigned int)val;
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
if (blkg->plid == plid && !blkg->conf.weight)
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
struct blkg_policy_data *pd = blkg->pd[blkg->plid];
if (blkg->plid == plid && !pd->conf.weight)
blkio_update_group_weight(blkg, blkcg->weight);
}
spin_unlock_irq(&blkcg->lock);
spin_unlock(&blkio_list_lock);

18
block/blk-cgroup.h
View File

@ -164,6 +164,13 @@ struct blkg_policy_data {
/* the blkg this per-policy data belongs to */
struct blkio_group *blkg;
/* Configuration */
struct blkio_group_conf conf;
struct blkio_group_stats stats;
/* Per cpu stats pointer */
struct blkio_group_stats_cpu __percpu *stats_cpu;
/* pol->pdata_size bytes of private data used by policy impl */
char pdata[] __aligned(__alignof__(unsigned long long));
};
@ -180,16 +187,9 @@ struct blkio_group {
/* reference count */
int refcnt;
/* Configuration */
struct blkio_group_conf conf;
/* Need to serialize the stats in the case of reset/update */
spinlock_t stats_lock;
struct blkio_group_stats stats;
/* Per cpu stats pointer */
struct blkio_group_stats_cpu __percpu *stats_cpu;
struct blkg_policy_data *pd;
struct blkg_policy_data *pd[BLKIO_NR_POLICIES];
struct rcu_head rcu_head;
};
@ -249,7 +249,7 @@ extern void blkg_destroy_all(struct request_queue *q);
static inline void *blkg_to_pdata(struct blkio_group *blkg,
struct blkio_policy_type *pol)
{
return blkg ? blkg->pd->pdata : NULL;
return blkg ? blkg->pd[pol->plid]->pdata : NULL;
}
/**