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cgroup: s/child_subsys_mask/subtree_ss_mask/

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For consistency with cgroup->subtree_control.

* cgroup->child_subsys_mask -> cgroup->subtree_ss_mask
* cgroup_calc_child_subsys_mask() -> cgroup_calc_subtree_ss_mask()
* cgroup_refresh_child_subsys_mask() -> cgroup_refresh_subtree_ss_mask()

No functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
This commit is contained in:
Tejun Heo 2016-02-22 22:25:46 -05:00
parent 5eb385cc5a
commit 8699b7762a
2 changed files with 29 additions and 30 deletions
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11
include/linux/cgroup-defs.h
View File

@ -253,13 +253,12 @@ struct cgroup {
/*
* The bitmask of subsystems enabled on the child cgroups.
* ->subtree_control is the one configured through
* "cgroup.subtree_control" while ->child_subsys_mask is the
* effective one which may have more subsystems enabled.
* Controller knobs are made available iff it's enabled in
* ->subtree_control.
* "cgroup.subtree_control" while ->child_ss_mask is the effective
* one which may have more subsystems enabled. Controller knobs
* are made available iff it's enabled in ->subtree_control.
*/
unsigned int subtree_control;
unsigned int child_subsys_mask;
unsigned long subtree_control;
unsigned long subtree_ss_mask;
/* Private pointers for each registered subsystem */
struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT];

48
kernel/cgroup.c
View File

@ -391,10 +391,10 @@ static struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgrp,
/*
* This function is used while updating css associations and thus
* can't test the csses directly. Use ->child_subsys_mask.
* can't test the csses directly. Use ->subtree_ss_mask.
*/
while (cgroup_parent(cgrp) &&
!(cgroup_parent(cgrp)->child_subsys_mask & (1 << ss->id)))
!(cgroup_parent(cgrp)->subtree_ss_mask & (1 << ss->id)))
cgrp = cgroup_parent(cgrp);
return cgroup_css(cgrp, ss);
@ -1256,7 +1256,7 @@ static umode_t cgroup_file_mode(const struct cftype *cft)
}
/**
* cgroup_calc_child_subsys_mask - calculate child_subsys_mask
* cgroup_calc_subtree_ss_mask - calculate subtree_ss_mask
* @cgrp: the target cgroup
* @subtree_control: the new subtree_control mask to consider
*
@ -1268,8 +1268,8 @@ static umode_t cgroup_file_mode(const struct cftype *cft)
* @subtree_control is to be applied to @cgrp. The returned mask is always
* a superset of @subtree_control and follows the usual hierarchy rules.
*/
static unsigned long cgroup_calc_child_subsys_mask(struct cgroup *cgrp,
unsigned long subtree_control)
static unsigned long cgroup_calc_subtree_ss_mask(struct cgroup *cgrp,
unsigned long subtree_control)
{
struct cgroup *parent = cgroup_parent(cgrp);
unsigned long cur_ss_mask = subtree_control;
@ -1293,7 +1293,7 @@ static unsigned long cgroup_calc_child_subsys_mask(struct cgroup *cgrp,
* to non-default hierarchies.
*/
if (parent)
new_ss_mask &= parent->child_subsys_mask;
new_ss_mask &= parent->subtree_ss_mask;
else
new_ss_mask &= cgrp->root->subsys_mask;
@ -1306,16 +1306,16 @@ static unsigned long cgroup_calc_child_subsys_mask(struct cgroup *cgrp,
}
/**
* cgroup_refresh_child_subsys_mask - update child_subsys_mask
* cgroup_refresh_subtree_ss_mask - update subtree_ss_mask
* @cgrp: the target cgroup
*
* Update @cgrp->child_subsys_mask according to the current
* @cgrp->subtree_control using cgroup_calc_child_subsys_mask().
* Update @cgrp->subtree_ss_mask according to the current
* @cgrp->subtree_control using cgroup_calc_subtree_ss_mask().
*/
static void cgroup_refresh_child_subsys_mask(struct cgroup *cgrp)
static void cgroup_refresh_subtree_ss_mask(struct cgroup *cgrp)
{
cgrp->child_subsys_mask =
cgroup_calc_child_subsys_mask(cgrp, cgrp->subtree_control);
cgrp->subtree_ss_mask =
cgroup_calc_subtree_ss_mask(cgrp, cgrp->subtree_control);
}
/**
@ -1542,7 +1542,7 @@ static int rebind_subsystems(struct cgroup_root *dst_root,
src_root->subsys_mask &= ~(1 << ssid);
scgrp->subtree_control &= ~(1 << ssid);
cgroup_refresh_child_subsys_mask(scgrp);
cgroup_refresh_subtree_ss_mask(scgrp);
/* default hierarchy doesn't enable controllers by default */
dst_root->subsys_mask |= 1 << ssid;
@ -1550,7 +1550,7 @@ static int rebind_subsystems(struct cgroup_root *dst_root,
static_branch_enable(cgroup_subsys_on_dfl_key[ssid]);
} else {
dcgrp->subtree_control |= 1 << ssid;
cgroup_refresh_child_subsys_mask(dcgrp);
cgroup_refresh_subtree_ss_mask(dcgrp);
static_branch_disable(cgroup_subsys_on_dfl_key[ssid]);
}
@ -2523,11 +2523,11 @@ static int cgroup_migrate_prepare_dst(struct cgroup *dst_cgrp,
lockdep_assert_held(&cgroup_mutex);
/*
* Except for the root, child_subsys_mask must be zero for a cgroup
* Except for the root, subtree_ss_mask must be zero for a cgroup
* with tasks so that child cgroups don't compete against tasks.
*/
if (dst_cgrp && cgroup_on_dfl(dst_cgrp) && cgroup_parent(dst_cgrp) &&
dst_cgrp->child_subsys_mask)
dst_cgrp->subtree_ss_mask)
return -EBUSY;
/* look up the dst cset for each src cset and link it to src */
@ -2880,7 +2880,7 @@ static int cgroup_subtree_control_show(struct seq_file *seq, void *v)
* cgroup_update_dfl_csses - update css assoc of a subtree in default hierarchy
* @cgrp: root of the subtree to update csses for
*
* @cgrp's child_subsys_mask has changed and its subtree's (self excluded)
* @cgrp's subtree_ss_mask has changed and its subtree's (self excluded)
* css associations need to be updated accordingly. This function looks up
* all css_sets which are attached to the subtree, creates the matching
* updated css_sets and migrates the tasks to the new ones.
@ -2902,7 +2902,7 @@ static int cgroup_update_dfl_csses(struct cgroup *cgrp)
css_for_each_descendant_pre(css, cgroup_css(cgrp, NULL)) {
struct cgrp_cset_link *link;
/* self is not affected by child_subsys_mask change */
/* self is not affected by subtree_ss_mask change */
if (css->cgroup == cgrp)
continue;
@ -3034,9 +3034,9 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
* depending on subsystem dependencies.
*/
old_sc = cgrp->subtree_control;
old_ss = cgrp->child_subsys_mask;
old_ss = cgrp->subtree_ss_mask;
new_sc = (old_sc | enable) & ~disable;
new_ss = cgroup_calc_child_subsys_mask(cgrp, new_sc);
new_ss = cgroup_calc_subtree_ss_mask(cgrp, new_sc);
css_enable = ~old_ss & new_ss;
css_disable = old_ss & ~new_ss;
@ -3069,7 +3069,7 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
}
cgrp->subtree_control = new_sc;
cgrp->child_subsys_mask = new_ss;
cgrp->subtree_ss_mask = new_ss;
/*
* Create new csses or make the existing ones visible. A css is
@ -3135,7 +3135,7 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
err_undo_css:
cgrp->subtree_control = old_sc;
cgrp->child_subsys_mask = old_ss;
cgrp->subtree_ss_mask = old_ss;
for_each_subsys(ss, ssid) {
if (!(enable & (1 << ssid)))
@ -4969,7 +4969,7 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
/* let's create and online css's */
for_each_subsys(ss, ssid) {
if (parent->child_subsys_mask & (1 << ssid)) {
if (parent->subtree_ss_mask & (1 << ssid)) {
ret = create_css(cgrp, ss,
parent->subtree_control & (1 << ssid));
if (ret)
@ -4983,7 +4983,7 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
*/
if (!cgroup_on_dfl(cgrp)) {
cgrp->subtree_control = parent->subtree_control;
cgroup_refresh_child_subsys_mask(cgrp);
cgroup_refresh_subtree_ss_mask(cgrp);
}
kernfs_activate(kn);