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Date: Tue, 8 Jan 2013 13:27:50 -0500
From: Vivek Goyal <vgoyal@...hat.com>
To: Tejun Heo <tj@...nel.org>
Cc: lizefan@...wei.com, axboe@...nel.dk,
containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, ctalbott@...gle.com, rni@...gle.com
Subject: Re: [PATCH 24/24] cfq-iosched: add hierarchical cfq_group statistics
On Fri, Dec 28, 2012 at 12:35:46PM -0800, Tejun Heo wrote:
> 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.
>
No recursive counterparts for stats under DEBUG? Well, I would not
complain. There are too many stats already and if somebody needs
recursive stats for debug stats, let them do it.
Acked-by: Vivek Goyal <vgoyal@...hat.com>
Vivek
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
> block/cfq-iosched.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 105 insertions(+)
>
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index 4d75b79..b66365b 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -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",
> --
> 1.8.0.2
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