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author | Tejun Heo <tj@kernel.org> | 2012-04-01 21:38:44 (GMT) |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2012-04-01 21:38:44 (GMT) |
commit | 41b38b6d540f951c49315d8573e6f6195a6e736d (patch) | |
tree | e667cec0bba6e7678810ff0087c96547a21a45c7 /block | |
parent | 629ed0b10209ffc4e1d439e5508d52d5e3a090b8 (diff) | |
download | linux-fsl-qoriq-41b38b6d540f951c49315d8573e6f6195a6e736d.tar.xz |
blkcg: cfq doesn't need per-cpu dispatch stats
blkio_group_stats_cpu is used to count dispatch stats using per-cpu
counters. This is used by both blk-throtl and cfq-iosched but the
sharing is rather silly.
* cfq-iosched doesn't need per-cpu dispatch stats. cfq always updates
those stats while holding queue_lock.
* blk-throtl needs per-cpu dispatch stats but only service_bytes and
serviced. It doesn't make use of sectors.
This patch makes cfq add and use global stats for service_bytes,
serviced and sectors, removes per-cpu sectors counter and moves
per-cpu stat printing code to blk-throttle.c.
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'block')
-rw-r--r-- | block/blk-cgroup.c | 63 | ||||
-rw-r--r-- | block/blk-cgroup.h | 12 | ||||
-rw-r--r-- | block/blk-throttle.c | 31 | ||||
-rw-r--r-- | block/cfq-iosched.c | 37 |
4 files changed, 48 insertions, 95 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 821a0a3..19ee29f 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -390,7 +390,6 @@ static void blkio_reset_stats_cpu(struct blkio_group *blkg, int plid) blkg_rwstat_reset(&sc->service_bytes); blkg_rwstat_reset(&sc->serviced); - blkg_stat_reset(&sc->sectors); } } @@ -417,6 +416,8 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) struct blkio_group_stats *stats = &pd->stats; /* queued stats shouldn't be cleared */ + blkg_rwstat_reset(&stats->service_bytes); + blkg_rwstat_reset(&stats->serviced); blkg_rwstat_reset(&stats->merged); blkg_rwstat_reset(&stats->service_time); blkg_rwstat_reset(&stats->wait_time); @@ -577,66 +578,6 @@ int blkcg_print_rwstat(struct cgroup *cgrp, struct cftype *cft, } EXPORT_SYMBOL_GPL(blkcg_print_rwstat); -static u64 blkg_prfill_cpu_stat(struct seq_file *sf, - struct blkg_policy_data *pd, int off) -{ - u64 v = 0; - int cpu; - - for_each_possible_cpu(cpu) { - struct blkio_group_stats_cpu *sc = - per_cpu_ptr(pd->stats_cpu, cpu); - - v += blkg_stat_read((void *)sc + off); - } - - return __blkg_prfill_u64(sf, pd, v); -} - -static u64 blkg_prfill_cpu_rwstat(struct seq_file *sf, - struct blkg_policy_data *pd, int off) -{ - struct blkg_rwstat rwstat = { }, tmp; - int i, cpu; - - for_each_possible_cpu(cpu) { - struct blkio_group_stats_cpu *sc = - per_cpu_ptr(pd->stats_cpu, cpu); - - tmp = blkg_rwstat_read((void *)sc + off); - for (i = 0; i < BLKG_RWSTAT_NR; i++) - rwstat.cnt[i] += tmp.cnt[i]; - } - - return __blkg_prfill_rwstat(sf, pd, &rwstat); -} - -/* print per-cpu blkg_stat specified by BLKCG_STAT_PRIV() */ -int blkcg_print_cpu_stat(struct cgroup *cgrp, struct cftype *cft, - struct seq_file *sf) -{ - struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); - - blkcg_print_blkgs(sf, blkcg, blkg_prfill_cpu_stat, - BLKCG_STAT_POL(cft->private), - BLKCG_STAT_OFF(cft->private), false); - return 0; -} -EXPORT_SYMBOL_GPL(blkcg_print_cpu_stat); - -/* print per-cpu blkg_rwstat specified by BLKCG_STAT_PRIV() */ -int blkcg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft, - struct seq_file *sf) -{ - struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); - - blkcg_print_blkgs(sf, blkcg, blkg_prfill_cpu_rwstat, - BLKCG_STAT_POL(cft->private), - BLKCG_STAT_OFF(cft->private), true); - return 0; -} -EXPORT_SYMBOL_GPL(blkcg_print_cpu_rwstat); - /** * blkg_conf_prep - parse and prepare for per-blkg config update * @blkcg: target block cgroup diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 0b0a176..c82de47 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -65,6 +65,10 @@ struct blkg_rwstat { }; struct blkio_group_stats { + /* total bytes transferred */ + struct blkg_rwstat service_bytes; + /* total IOs serviced, post merge */ + struct blkg_rwstat serviced; /* number of ios merged */ struct blkg_rwstat merged; /* total time spent on device in ns, may not be accurate w/ queueing */ @@ -73,6 +77,8 @@ struct blkio_group_stats { struct blkg_rwstat wait_time; /* number of IOs queued up */ struct blkg_rwstat queued; + /* total sectors transferred */ + struct blkg_stat sectors; /* total disk time and nr sectors dispatched by this group */ struct blkg_stat time; #ifdef CONFIG_DEBUG_BLK_CGROUP @@ -104,8 +110,6 @@ struct blkio_group_stats_cpu { struct blkg_rwstat service_bytes; /* total IOs serviced, post merge */ struct blkg_rwstat serviced; - /* total sectors transferred */ - struct blkg_stat sectors; }; struct blkio_group_conf { @@ -183,10 +187,6 @@ int blkcg_print_stat(struct cgroup *cgrp, struct cftype *cft, struct seq_file *sf); int blkcg_print_rwstat(struct cgroup *cgrp, struct cftype *cft, struct seq_file *sf); -int blkcg_print_cpu_stat(struct cgroup *cgrp, struct cftype *cft, - struct seq_file *sf); -int blkcg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft, - struct seq_file *sf); struct blkg_conf_ctx { struct gendisk *disk; diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 5d647ed..cb259bc 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -582,7 +582,6 @@ static void throtl_update_dispatch_stats(struct blkio_group *blkg, u64 bytes, stats_cpu = this_cpu_ptr(pd->stats_cpu); - blkg_stat_add(&stats_cpu->sectors, bytes >> 9); blkg_rwstat_add(&stats_cpu->serviced, rw, 1); blkg_rwstat_add(&stats_cpu->service_bytes, rw, bytes); @@ -843,6 +842,36 @@ static void throtl_update_blkio_group_common(struct throtl_data *td, throtl_schedule_delayed_work(td, 0); } +static u64 blkg_prfill_cpu_rwstat(struct seq_file *sf, + struct blkg_policy_data *pd, int off) +{ + struct blkg_rwstat rwstat = { }, tmp; + int i, cpu; + + for_each_possible_cpu(cpu) { + struct blkio_group_stats_cpu *sc = + per_cpu_ptr(pd->stats_cpu, cpu); + + tmp = blkg_rwstat_read((void *)sc + off); + for (i = 0; i < BLKG_RWSTAT_NR; i++) + rwstat.cnt[i] += tmp.cnt[i]; + } + + return __blkg_prfill_rwstat(sf, pd, &rwstat); +} + +/* print per-cpu blkg_rwstat specified by BLKCG_STAT_PRIV() */ +static int blkcg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft, + struct seq_file *sf) +{ + struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); + + blkcg_print_blkgs(sf, blkcg, blkg_prfill_cpu_rwstat, + BLKCG_STAT_POL(cft->private), + BLKCG_STAT_OFF(cft->private), true); + return 0; +} + static u64 blkg_prfill_conf_u64(struct seq_file *sf, struct blkg_policy_data *pd, int off) { diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 4991380..effd894 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -624,29 +624,12 @@ static inline void cfq_blkiocg_update_dispatch_stats(struct blkio_group *blkg, struct blkio_policy_type *pol, uint64_t bytes, bool direction, bool sync) { + struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; int rw = (direction ? REQ_WRITE : 0) | (sync ? REQ_SYNC : 0); - struct blkg_policy_data *pd = blkg->pd[pol->plid]; - struct blkio_group_stats_cpu *stats_cpu; - unsigned long flags; - /* If per cpu stats are not allocated yet, don't do any accounting. */ - if (pd->stats_cpu == NULL) - return; - - /* - * Disabling interrupts to provide mutual exclusion between two - * writes on same cpu. It probably is not needed for 64bit. Not - * optimizing that case yet. - */ - local_irq_save(flags); - - stats_cpu = this_cpu_ptr(pd->stats_cpu); - - blkg_stat_add(&stats_cpu->sectors, bytes >> 9); - blkg_rwstat_add(&stats_cpu->serviced, rw, 1); - blkg_rwstat_add(&stats_cpu->service_bytes, rw, bytes); - - local_irq_restore(flags); + blkg_stat_add(&stats->sectors, bytes >> 9); + blkg_rwstat_add(&stats->serviced, rw, 1); + blkg_rwstat_add(&stats->service_bytes, rw, bytes); } static inline void cfq_blkiocg_update_completion_stats(struct blkio_group *blkg, @@ -1520,20 +1503,20 @@ static struct cftype cfq_blkcg_files[] = { { .name = "sectors", .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, - offsetof(struct blkio_group_stats_cpu, sectors)), - .read_seq_string = blkcg_print_cpu_stat, + offsetof(struct blkio_group_stats, sectors)), + .read_seq_string = blkcg_print_stat, }, { .name = "io_service_bytes", .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, - offsetof(struct blkio_group_stats_cpu, service_bytes)), - .read_seq_string = blkcg_print_cpu_rwstat, + offsetof(struct blkio_group_stats, service_bytes)), + .read_seq_string = blkcg_print_rwstat, }, { .name = "io_serviced", .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, - offsetof(struct blkio_group_stats_cpu, serviced)), - .read_seq_string = blkcg_print_cpu_rwstat, + offsetof(struct blkio_group_stats, serviced)), + .read_seq_string = blkcg_print_rwstat, }, { .name = "io_service_time", |