path: root/block
diff options
authorLinus Torvalds <>2015-11-05 14:51:32 -0800
committerLinus Torvalds <>2015-11-05 14:51:32 -0800
commit69234acee54407962a20bedf90ef9c96326994b5 (patch)
tree5e979b1a489d866691c2c65ac3f46b4f29feef68 /block
parent11eaaadb3ea376c6c194491c2e9bddd647f9d253 (diff)
parentd57456753787ab158f906f1f8eb58d54a2ccd9f4 (diff)
Merge branch 'for-4.4' of git://
Pull cgroup updates from Tejun Heo: "The cgroup core saw several significant updates this cycle: - percpu_rwsem for threadgroup locking is reinstated. This was temporarily dropped due to down_write latency issues. Oleg's rework of percpu_rwsem which is scheduled to be merged in this merge window resolves the issue. - On the v2 hierarchy, when controllers are enabled and disabled, all operations are atomic and can fail and revert cleanly. This allows ->can_attach() failure which is necessary for cpu RT slices. - Tasks now stay associated with the original cgroups after exit until released. This allows tracking resources held by zombies (e.g. pids) and makes it easy to find out where zombies came from on the v2 hierarchy. The pids controller was broken before these changes as zombies escaped the limits; unfortunately, updating this behavior required too many invasive changes and I don't think it's a good idea to backport them, so the pids controller on 4.3, the first version which included the pids controller, will stay broken at least until I'm sure about the cgroup core changes. - Optimization of a couple common tests using static_key" * 'for-4.4' of git:// (38 commits) cgroup: fix race condition around termination check in css_task_iter_next() blkcg: don't create "io.stat" on the root cgroup cgroup: drop cgroup__DEVEL__legacy_files_on_dfl cgroup: replace error handling in cgroup_init() with WARN_ON()s cgroup: add cgroup_subsys->free() method and use it to fix pids controller cgroup: keep zombies associated with their original cgroups cgroup: make css_set_rwsem a spinlock and rename it to css_set_lock cgroup: don't hold css_set_rwsem across css task iteration cgroup: reorganize css_task_iter functions cgroup: factor out css_set_move_task() cgroup: keep css_set and task lists in chronological order cgroup: make cgroup_destroy_locked() test cgroup_is_populated() cgroup: make css_sets pin the associated cgroups cgroup: relocate cgroup_[try]get/put() cgroup: move check_for_release() invocation cgroup: replace cgroup_has_tasks() with cgroup_is_populated() cgroup: make cgroup->nr_populated count the number of populated css_sets cgroup: remove an unused parameter from cgroup_task_migrate() cgroup: fix too early usage of static_branch_disable() cgroup: make cgroup_update_dfl_csses() migrate all target processes atomically ...
Diffstat (limited to 'block')
3 files changed, 4 insertions, 3 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 55512dd62633..5bcdfc10c23a 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -899,6 +899,7 @@ static int blkcg_print_stat(struct seq_file *sf, void *v)
struct cftype blkcg_files[] = {
.name = "stat",
+ .flags = CFTYPE_NOT_ON_ROOT,
.seq_show = blkcg_print_stat,
{ } /* terminate */
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index c75a2636dd40..2149a1ddbacf 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -369,7 +369,7 @@ static void throtl_pd_init(struct blkg_policy_data *pd)
* regardless of the position of the group in the hierarchy.
sq->parent_sq = &td->service_queue;
- if (cgroup_on_dfl(blkg->blkcg->css.cgroup) && blkg->parent)
+ if (cgroup_subsys_on_dfl(io_cgrp_subsys) && blkg->parent)
sq->parent_sq = &blkg_to_tg(blkg->parent)->service_queue;
tg->td = td;
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 04de88463a98..1f9093e901da 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1581,7 +1581,7 @@ static struct blkcg_policy_data *cfq_cpd_alloc(gfp_t gfp)
static void cfq_cpd_init(struct blkcg_policy_data *cpd)
struct cfq_group_data *cgd = cpd_to_cfqgd(cpd);
- unsigned int weight = cgroup_on_dfl(blkcg_root.css.cgroup) ?
+ unsigned int weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ?
if (cpd_to_blkcg(cpd) == &blkcg_root)
@@ -1599,7 +1599,7 @@ static void cfq_cpd_free(struct blkcg_policy_data *cpd)
static void cfq_cpd_bind(struct blkcg_policy_data *cpd)
struct blkcg *blkcg = cpd_to_blkcg(cpd);
- bool on_dfl = cgroup_on_dfl(blkcg_root.css.cgroup);
+ bool on_dfl = cgroup_subsys_on_dfl(io_cgrp_subsys);
unsigned int weight = on_dfl ? CGROUP_WEIGHT_DFL : CFQ_WEIGHT_LEGACY_DFL;
if (blkcg == &blkcg_root)