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cgroup: reorder css_set fields 

Reorder css_set fields so that they're roughly in the order of how hot
they are.  The rough order is

1. the actual csses
2. reference counter and the default cgroup pointer.
3. task lists and iterations
4. fields used during merge including css_set lookup
5. the rest

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Acked-by: Zefan Li <lizefan@huawei.com>
hifive-unleashed-5.1
Tejun Heo 2016-12-27 14:49:05 -05:00
parent 2fae986343
commit 5f617ebbdf
2 changed files with 36 additions and 33 deletions
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56
include/linux/cgroup-defs.h
View File

@ -148,14 +148,18 @@ struct cgroup_subsys_state {
* set for a task.
*/
struct css_set {
/* Reference count */
/*
* Set of subsystem states, one for each subsystem. This array is
* immutable after creation apart from the init_css_set during
* subsystem registration (at boot time).
*/
struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
/* reference count */
atomic_t refcount;
/*
* List running through all cgroup groups in the same hash
* slot. Protected by css_set_lock
*/
struct hlist_node hlist;
/* the default cgroup associated with this css_set */
struct cgroup *dfl_cgrp;
/*
* Lists running through all tasks using this cgroup group.
@ -167,22 +171,30 @@ struct css_set {
struct list_head tasks;
struct list_head mg_tasks;
/* all css_task_iters currently walking this cset */
struct list_head task_iters;
/*
* On the default hierarhcy, ->subsys[ssid] may point to a css
* attached to an ancestor instead of the cgroup this css_set is
* associated with. The following node is anchored at
* ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
* iterate through all css's attached to a given cgroup.
*/
struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
/*
* List running through all cgroup groups in the same hash
* slot. Protected by css_set_lock
*/
struct hlist_node hlist;
/*
* List of cgrp_cset_links pointing at cgroups referenced from this
* css_set. Protected by css_set_lock.
*/
struct list_head cgrp_links;
/* the default cgroup associated with this css_set */
struct cgroup *dfl_cgrp;
/*
* Set of subsystem states, one for each subsystem. This array is
* immutable after creation apart from the init_css_set during
* subsystem registration (at boot time).
*/
struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
/*
* List of csets participating in the on-going migration either as
* source or destination. Protected by cgroup_mutex.
@ -201,18 +213,6 @@ struct css_set {
struct cgroup *mg_dst_cgrp;
struct css_set *mg_dst_cset;
/*
* On the default hierarhcy, ->subsys[ssid] may point to a css
* attached to an ancestor instead of the cgroup this css_set is
* associated with. The following node is anchored at
* ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
* iterate through all css's attached to a given cgroup.
*/
struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
/* all css_task_iters currently walking this cset */
struct list_head task_iters;
/* dead and being drained, ignore for migration */
bool dead;

13
kernel/cgroup.c
View File

@ -647,12 +647,12 @@ struct cgrp_cset_link {
*/
struct css_set init_css_set = {
.refcount = ATOMIC_INIT(1),
.cgrp_links = LIST_HEAD_INIT(init_css_set.cgrp_links),
.tasks = LIST_HEAD_INIT(init_css_set.tasks),
.mg_tasks = LIST_HEAD_INIT(init_css_set.mg_tasks),
.task_iters = LIST_HEAD_INIT(init_css_set.task_iters),
.cgrp_links = LIST_HEAD_INIT(init_css_set.cgrp_links),
.mg_preload_node = LIST_HEAD_INIT(init_css_set.mg_preload_node),
.mg_node = LIST_HEAD_INIT(init_css_set.mg_node),
.task_iters = LIST_HEAD_INIT(init_css_set.task_iters),
};
static int css_set_count = 1; /* 1 for init_css_set */
@ -1095,13 +1095,13 @@ static struct css_set *find_css_set(struct css_set *old_cset,
}
atomic_set(&cset->refcount, 1);
INIT_LIST_HEAD(&cset->cgrp_links);
INIT_LIST_HEAD(&cset->tasks);
INIT_LIST_HEAD(&cset->mg_tasks);
INIT_LIST_HEAD(&cset->mg_preload_node);
INIT_LIST_HEAD(&cset->mg_node);
INIT_LIST_HEAD(&cset->task_iters);
INIT_HLIST_NODE(&cset->hlist);
INIT_LIST_HEAD(&cset->cgrp_links);
INIT_LIST_HEAD(&cset->mg_preload_node);
INIT_LIST_HEAD(&cset->mg_node);
/* Copy the set of subsystem state objects generated in
* find_existing_css_set() */
@ -4384,6 +4384,9 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
struct task_struct *task;
int ret;
if (cgroup_on_dfl(to))
return -EINVAL;
if (!cgroup_may_migrate_to(to))
return -EBUSY;