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cfq-iosched: add hierarchical cfq_group statistics

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Unfortunately, at this point, there's no way to make the existing
statistics hierarchical without creating nasty surprises for the
existing users.  Just create recursive counterpart of the existing
stats.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
Tejun Heo 2013-01-09 08:05:13 -08:00
parent 0b39920b5f
commit 43114018cb
1 changed files with 105 additions and 0 deletions
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105
block/cfq-iosched.c
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@ -1528,6 +1528,32 @@ static void cfq_pd_offline(struct blkcg_gq *blkg)
cfqg_stats_xfer_dead(blkg_to_cfqg(blkg));
}
/* offset delta from cfqg->stats to cfqg->dead_stats */
static const int dead_stats_off_delta = offsetof(struct cfq_group, dead_stats) -
offsetof(struct cfq_group, stats);
/* to be used by recursive prfill, sums live and dead stats recursively */
static u64 cfqg_stat_pd_recursive_sum(struct blkg_policy_data *pd, int off)
{
u64 sum = 0;
sum += blkg_stat_recursive_sum(pd, off);
sum += blkg_stat_recursive_sum(pd, off + dead_stats_off_delta);
return sum;
}
/* to be used by recursive prfill, sums live and dead rwstats recursively */
static struct blkg_rwstat cfqg_rwstat_pd_recursive_sum(struct blkg_policy_data *pd,
int off)
{
struct blkg_rwstat a, b;
a = blkg_rwstat_recursive_sum(pd, off);
b = blkg_rwstat_recursive_sum(pd, off + dead_stats_off_delta);
blkg_rwstat_merge(&a, &b);
return a;
}
static void cfq_pd_reset_stats(struct blkcg_gq *blkg)
{
struct cfq_group *cfqg = blkg_to_cfqg(blkg);
@ -1732,6 +1758,42 @@ static int cfqg_print_rwstat(struct cgroup *cgrp, struct cftype *cft,
return 0;
}
static u64 cfqg_prfill_stat_recursive(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
{
u64 sum = cfqg_stat_pd_recursive_sum(pd, off);
return __blkg_prfill_u64(sf, pd, sum);
}
static u64 cfqg_prfill_rwstat_recursive(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
{
struct blkg_rwstat sum = cfqg_rwstat_pd_recursive_sum(pd, off);
return __blkg_prfill_rwstat(sf, pd, &sum);
}
static int cfqg_print_stat_recursive(struct cgroup *cgrp, struct cftype *cft,
struct seq_file *sf)
{
struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
blkcg_print_blkgs(sf, blkcg, cfqg_prfill_stat_recursive,
&blkcg_policy_cfq, cft->private, false);
return 0;
}
static int cfqg_print_rwstat_recursive(struct cgroup *cgrp, struct cftype *cft,
struct seq_file *sf)
{
struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
blkcg_print_blkgs(sf, blkcg, cfqg_prfill_rwstat_recursive,
&blkcg_policy_cfq, cft->private, true);
return 0;
}
#ifdef CONFIG_DEBUG_BLK_CGROUP
static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
@ -1803,6 +1865,7 @@ static struct cftype cfq_blkcg_files[] = {
.write_u64 = cfq_set_leaf_weight,
},
/* statistics, covers only the tasks in the cfqg */
{
.name = "time",
.private = offsetof(struct cfq_group, stats.time),
@ -1843,6 +1906,48 @@ static struct cftype cfq_blkcg_files[] = {
.private = offsetof(struct cfq_group, stats.queued),
.read_seq_string = cfqg_print_rwstat,
},
/* the same statictics which cover the cfqg and its descendants */
{
.name = "time_recursive",
.private = offsetof(struct cfq_group, stats.time),
.read_seq_string = cfqg_print_stat_recursive,
},
{
.name = "sectors_recursive",
.private = offsetof(struct cfq_group, stats.sectors),
.read_seq_string = cfqg_print_stat_recursive,
},
{
.name = "io_service_bytes_recursive",
.private = offsetof(struct cfq_group, stats.service_bytes),
.read_seq_string = cfqg_print_rwstat_recursive,
},
{
.name = "io_serviced_recursive",
.private = offsetof(struct cfq_group, stats.serviced),
.read_seq_string = cfqg_print_rwstat_recursive,
},
{
.name = "io_service_time_recursive",
.private = offsetof(struct cfq_group, stats.service_time),
.read_seq_string = cfqg_print_rwstat_recursive,
},
{
.name = "io_wait_time_recursive",
.private = offsetof(struct cfq_group, stats.wait_time),
.read_seq_string = cfqg_print_rwstat_recursive,
},
{
.name = "io_merged_recursive",
.private = offsetof(struct cfq_group, stats.merged),
.read_seq_string = cfqg_print_rwstat_recursive,
},
{
.name = "io_queued_recursive",
.private = offsetof(struct cfq_group, stats.queued),
.read_seq_string = cfqg_print_rwstat_recursive,
},
#ifdef CONFIG_DEBUG_BLK_CGROUP
{
.name = "avg_queue_size",