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cgroup: consistently use @cset for struct css_set variables
cgroup.c uses @cg for most struct css_set variables, which in itself could be a bit confusing, but made much worse by the fact that there are places which use @cg for struct cgroup variables. compare_css_sets() epitomizes this confusion - @[old_]cg are struct css_set while @cg[12] are struct cgroup. It's not like the whole deal with cgroup, css_set and cg_cgroup_link isn't already confusing enough. Let's give it some sanity by uniformly using @cset for all struct css_set variables. * s/cg/cset/ for all css_set variables. * s/oldcg/old_cset/ s/oldcgrp/old_cgrp/. The same for the ones prefixed with "new". * s/cg/cgrp/ for cgroup variables in compare_css_sets(). * s/css/cset/ for the cgroup variable in task_cgroup_from_root(). * Whiteline adjustments. This patch is purely cosmetic. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo
parent
3fc3db9a3a
commit
5abb885573
216
kernel/cgroup.c
216
kernel/cgroup.c
@ -376,30 +376,32 @@ static unsigned long css_set_hash(struct cgroup_subsys_state *css[])
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* compiled into their kernel but not actually in use */
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static int use_task_css_set_links __read_mostly;
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static void __put_css_set(struct css_set *cg, int taskexit)
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static void __put_css_set(struct css_set *cset, int taskexit)
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{
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struct cg_cgroup_link *link;
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struct cg_cgroup_link *saved_link;
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/*
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* Ensure that the refcount doesn't hit zero while any readers
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* can see it. Similar to atomic_dec_and_lock(), but for an
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* rwlock
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*/
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if (atomic_add_unless(&cg->refcount, -1, 1))
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if (atomic_add_unless(&cset->refcount, -1, 1))
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return;
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write_lock(&css_set_lock);
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if (!atomic_dec_and_test(&cg->refcount)) {
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if (!atomic_dec_and_test(&cset->refcount)) {
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write_unlock(&css_set_lock);
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return;
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}
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/* This css_set is dead. unlink it and release cgroup refcounts */
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hash_del(&cg->hlist);
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hash_del(&cset->hlist);
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css_set_count--;
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list_for_each_entry_safe(link, saved_link, &cg->cg_links,
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list_for_each_entry_safe(link, saved_link, &cset->cg_links,
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cg_link_list) {
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struct cgroup *cgrp = link->cgrp;
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list_del(&link->cg_link_list);
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list_del(&link->cgrp_link_list);
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@ -421,45 +423,45 @@ static void __put_css_set(struct css_set *cg, int taskexit)
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}
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write_unlock(&css_set_lock);
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kfree_rcu(cg, rcu_head);
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kfree_rcu(cset, rcu_head);
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}
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/*
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* refcounted get/put for css_set objects
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*/
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static inline void get_css_set(struct css_set *cg)
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static inline void get_css_set(struct css_set *cset)
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{
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atomic_inc(&cg->refcount);
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atomic_inc(&cset->refcount);
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}
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static inline void put_css_set(struct css_set *cg)
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static inline void put_css_set(struct css_set *cset)
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{
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__put_css_set(cg, 0);
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__put_css_set(cset, 0);
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}
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static inline void put_css_set_taskexit(struct css_set *cg)
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static inline void put_css_set_taskexit(struct css_set *cset)
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{
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__put_css_set(cg, 1);
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__put_css_set(cset, 1);
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}
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/*
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* compare_css_sets - helper function for find_existing_css_set().
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* @cg: candidate css_set being tested
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* @old_cg: existing css_set for a task
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* @cset: candidate css_set being tested
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* @old_cset: existing css_set for a task
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* @new_cgrp: cgroup that's being entered by the task
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* @template: desired set of css pointers in css_set (pre-calculated)
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*
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* Returns true if "cg" matches "old_cg" except for the hierarchy
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* which "new_cgrp" belongs to, for which it should match "new_cgrp".
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*/
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static bool compare_css_sets(struct css_set *cg,
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struct css_set *old_cg,
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static bool compare_css_sets(struct css_set *cset,
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struct css_set *old_cset,
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struct cgroup *new_cgrp,
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struct cgroup_subsys_state *template[])
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{
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struct list_head *l1, *l2;
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if (memcmp(template, cg->subsys, sizeof(cg->subsys))) {
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if (memcmp(template, cset->subsys, sizeof(cset->subsys))) {
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/* Not all subsystems matched */
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return false;
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}
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@ -473,28 +475,28 @@ static bool compare_css_sets(struct css_set *cg,
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* candidates.
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*/
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l1 = &cg->cg_links;
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l2 = &old_cg->cg_links;
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l1 = &cset->cg_links;
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l2 = &old_cset->cg_links;
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while (1) {
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struct cg_cgroup_link *cgl1, *cgl2;
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struct cgroup *cg1, *cg2;
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struct cgroup *cgrp1, *cgrp2;
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l1 = l1->next;
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l2 = l2->next;
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/* See if we reached the end - both lists are equal length. */
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if (l1 == &cg->cg_links) {
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BUG_ON(l2 != &old_cg->cg_links);
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if (l1 == &cset->cg_links) {
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BUG_ON(l2 != &old_cset->cg_links);
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break;
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} else {
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BUG_ON(l2 == &old_cg->cg_links);
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BUG_ON(l2 == &old_cset->cg_links);
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}
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/* Locate the cgroups associated with these links. */
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cgl1 = list_entry(l1, struct cg_cgroup_link, cg_link_list);
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cgl2 = list_entry(l2, struct cg_cgroup_link, cg_link_list);
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cg1 = cgl1->cgrp;
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cg2 = cgl2->cgrp;
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cgrp1 = cgl1->cgrp;
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cgrp2 = cgl2->cgrp;
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/* Hierarchies should be linked in the same order. */
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BUG_ON(cg1->root != cg2->root);
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BUG_ON(cgrp1->root != cgrp2->root);
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/*
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* If this hierarchy is the hierarchy of the cgroup
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@ -503,11 +505,11 @@ static bool compare_css_sets(struct css_set *cg,
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* hierarchy, then this css_set should point to the
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* same cgroup as the old css_set.
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*/
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if (cg1->root == new_cgrp->root) {
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if (cg1 != new_cgrp)
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if (cgrp1->root == new_cgrp->root) {
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if (cgrp1 != new_cgrp)
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return false;
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} else {
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if (cg1 != cg2)
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if (cgrp1 != cgrp2)
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return false;
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}
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}
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@ -527,14 +529,13 @@ static bool compare_css_sets(struct css_set *cg,
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* template: location in which to build the desired set of subsystem
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* state objects for the new cgroup group
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*/
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static struct css_set *find_existing_css_set(
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struct css_set *oldcg,
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struct cgroup *cgrp,
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struct cgroup_subsys_state *template[])
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static struct css_set *find_existing_css_set(struct css_set *old_cset,
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struct cgroup *cgrp,
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struct cgroup_subsys_state *template[])
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{
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int i;
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struct cgroupfs_root *root = cgrp->root;
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struct css_set *cg;
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struct css_set *cset;
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unsigned long key;
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/*
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@ -551,17 +552,17 @@ static struct css_set *find_existing_css_set(
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} else {
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/* Subsystem is not in this hierarchy, so we
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* don't want to change the subsystem state */
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template[i] = oldcg->subsys[i];
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template[i] = old_cset->subsys[i];
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}
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}
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key = css_set_hash(template);
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hash_for_each_possible(css_set_table, cg, hlist, key) {
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if (!compare_css_sets(cg, oldcg, cgrp, template))
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hash_for_each_possible(css_set_table, cset, hlist, key) {
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if (!compare_css_sets(cset, old_cset, cgrp, template))
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continue;
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/* This css_set matches what we need */
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return cg;
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return cset;
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}
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/* No existing cgroup group matched */
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@ -603,18 +604,18 @@ static int allocate_cg_links(int count, struct list_head *tmp)
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/**
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* link_css_set - a helper function to link a css_set to a cgroup
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* @tmp_cg_links: cg_cgroup_link objects allocated by allocate_cg_links()
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* @cg: the css_set to be linked
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* @cset: the css_set to be linked
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* @cgrp: the destination cgroup
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*/
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static void link_css_set(struct list_head *tmp_cg_links,
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struct css_set *cg, struct cgroup *cgrp)
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struct css_set *cset, struct cgroup *cgrp)
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{
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struct cg_cgroup_link *link;
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BUG_ON(list_empty(tmp_cg_links));
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link = list_first_entry(tmp_cg_links, struct cg_cgroup_link,
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cgrp_link_list);
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link->cg = cg;
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link->cg = cset;
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link->cgrp = cgrp;
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atomic_inc(&cgrp->count);
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list_move(&link->cgrp_link_list, &cgrp->css_sets);
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@ -622,7 +623,7 @@ static void link_css_set(struct list_head *tmp_cg_links,
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* Always add links to the tail of the list so that the list
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* is sorted by order of hierarchy creation
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*/
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list_add_tail(&link->cg_link_list, &cg->cg_links);
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list_add_tail(&link->cg_link_list, &cset->cg_links);
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}
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/*
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@ -632,10 +633,10 @@ static void link_css_set(struct list_head *tmp_cg_links,
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* substituted into the appropriate hierarchy. Must be called with
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* cgroup_mutex held
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*/
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static struct css_set *find_css_set(
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struct css_set *oldcg, struct cgroup *cgrp)
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static struct css_set *find_css_set(struct css_set *old_cset,
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struct cgroup *cgrp)
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{
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struct css_set *res;
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struct css_set *cset;
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struct cgroup_subsys_state *template[CGROUP_SUBSYS_COUNT];
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struct list_head tmp_cg_links;
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@ -646,40 +647,40 @@ static struct css_set *find_css_set(
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/* First see if we already have a cgroup group that matches
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* the desired set */
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read_lock(&css_set_lock);
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res = find_existing_css_set(oldcg, cgrp, template);
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if (res)
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get_css_set(res);
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cset = find_existing_css_set(old_cset, cgrp, template);
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if (cset)
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get_css_set(cset);
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read_unlock(&css_set_lock);
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if (res)
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return res;
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if (cset)
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return cset;
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res = kmalloc(sizeof(*res), GFP_KERNEL);
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if (!res)
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cset = kmalloc(sizeof(*cset), GFP_KERNEL);
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if (!cset)
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return NULL;
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/* Allocate all the cg_cgroup_link objects that we'll need */
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if (allocate_cg_links(root_count, &tmp_cg_links) < 0) {
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kfree(res);
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kfree(cset);
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return NULL;
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}
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atomic_set(&res->refcount, 1);
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INIT_LIST_HEAD(&res->cg_links);
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INIT_LIST_HEAD(&res->tasks);
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INIT_HLIST_NODE(&res->hlist);
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atomic_set(&cset->refcount, 1);
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INIT_LIST_HEAD(&cset->cg_links);
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INIT_LIST_HEAD(&cset->tasks);
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INIT_HLIST_NODE(&cset->hlist);
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/* Copy the set of subsystem state objects generated in
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* find_existing_css_set() */
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memcpy(res->subsys, template, sizeof(res->subsys));
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memcpy(cset->subsys, template, sizeof(cset->subsys));
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write_lock(&css_set_lock);
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/* Add reference counts and links from the new css_set. */
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list_for_each_entry(link, &oldcg->cg_links, cg_link_list) {
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list_for_each_entry(link, &old_cset->cg_links, cg_link_list) {
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struct cgroup *c = link->cgrp;
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if (c->root == cgrp->root)
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c = cgrp;
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link_css_set(&tmp_cg_links, res, c);
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link_css_set(&tmp_cg_links, cset, c);
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}
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BUG_ON(!list_empty(&tmp_cg_links));
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@ -687,12 +688,12 @@ static struct css_set *find_css_set(
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css_set_count++;
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/* Add this cgroup group to the hash table */
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key = css_set_hash(res->subsys);
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hash_add(css_set_table, &res->hlist, key);
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key = css_set_hash(cset->subsys);
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hash_add(css_set_table, &cset->hlist, key);
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write_unlock(&css_set_lock);
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return res;
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return cset;
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}
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/*
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@ -702,7 +703,7 @@ static struct css_set *find_css_set(
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static struct cgroup *task_cgroup_from_root(struct task_struct *task,
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struct cgroupfs_root *root)
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{
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struct css_set *css;
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struct css_set *cset;
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struct cgroup *res = NULL;
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BUG_ON(!mutex_is_locked(&cgroup_mutex));
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@ -712,12 +713,12 @@ static struct cgroup *task_cgroup_from_root(struct task_struct *task,
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* task can't change groups, so the only thing that can happen
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* is that it exits and its css is set back to init_css_set.
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*/
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css = task->cgroups;
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if (css == &init_css_set) {
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cset = task->cgroups;
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if (cset == &init_css_set) {
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res = &root->top_cgroup;
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} else {
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struct cg_cgroup_link *link;
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list_for_each_entry(link, &css->cg_links, cg_link_list) {
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list_for_each_entry(link, &cset->cg_links, cg_link_list) {
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struct cgroup *c = link->cgrp;
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if (c->root == root) {
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res = c;
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@ -1608,7 +1609,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
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struct cgroupfs_root *existing_root;
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const struct cred *cred;
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int i;
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struct css_set *cg;
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struct css_set *cset;
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BUG_ON(sb->s_root != NULL);
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@ -1666,8 +1667,8 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
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/* Link the top cgroup in this hierarchy into all
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* the css_set objects */
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write_lock(&css_set_lock);
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hash_for_each(css_set_table, i, cg, hlist)
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link_css_set(&tmp_cg_links, cg, root_cgrp);
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hash_for_each(css_set_table, i, cset, hlist)
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link_css_set(&tmp_cg_links, cset, root_cgrp);
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write_unlock(&css_set_lock);
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free_cg_links(&tmp_cg_links);
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@ -1944,10 +1945,11 @@ EXPORT_SYMBOL_GPL(cgroup_taskset_size);
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*
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* Must be called with cgroup_mutex and threadgroup locked.
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*/
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static void cgroup_task_migrate(struct cgroup *oldcgrp,
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struct task_struct *tsk, struct css_set *newcg)
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static void cgroup_task_migrate(struct cgroup *old_cgrp,
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struct task_struct *tsk,
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struct css_set *new_cset)
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{
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struct css_set *oldcg;
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struct css_set *old_cset;
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/*
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* We are synchronized through threadgroup_lock() against PF_EXITING
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@ -1955,25 +1957,25 @@ static void cgroup_task_migrate(struct cgroup *oldcgrp,
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* css_set to init_css_set and dropping the old one.
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*/
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WARN_ON_ONCE(tsk->flags & PF_EXITING);
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oldcg = tsk->cgroups;
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old_cset = tsk->cgroups;
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task_lock(tsk);
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rcu_assign_pointer(tsk->cgroups, newcg);
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rcu_assign_pointer(tsk->cgroups, new_cset);
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task_unlock(tsk);
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/* Update the css_set linked lists if we're using them */
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write_lock(&css_set_lock);
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if (!list_empty(&tsk->cg_list))
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list_move(&tsk->cg_list, &newcg->tasks);
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list_move(&tsk->cg_list, &new_cset->tasks);
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write_unlock(&css_set_lock);
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/*
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* We just gained a reference on oldcg by taking it from the task. As
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* trading it for newcg is protected by cgroup_mutex, we're safe to drop
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* it here; it will be freed under RCU.
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* We just gained a reference on old_cset by taking it from the
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* task. As trading it for new_cset is protected by cgroup_mutex,
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* we're safe to drop it here; it will be freed under RCU.
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*/
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set_bit(CGRP_RELEASABLE, &oldcgrp->flags);
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put_css_set(oldcg);
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set_bit(CGRP_RELEASABLE, &old_cgrp->flags);
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put_css_set(old_cset);
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}
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/**
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@ -2925,7 +2927,7 @@ static void cgroup_advance_iter(struct cgroup *cgrp,
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{
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struct list_head *l = it->cg_link;
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struct cg_cgroup_link *link;
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struct css_set *cg;
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struct css_set *cset;
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|
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/* Advance to the next non-empty css_set */
|
||||
do {
|
||||
@ -2935,10 +2937,10 @@ static void cgroup_advance_iter(struct cgroup *cgrp,
|
||||
return;
|
||||
}
|
||||
link = list_entry(l, struct cg_cgroup_link, cgrp_link_list);
|
||||
cg = link->cg;
|
||||
} while (list_empty(&cg->tasks));
|
||||
cset = link->cg;
|
||||
} while (list_empty(&cset->tasks));
|
||||
it->cg_link = l;
|
||||
it->task = cg->tasks.next;
|
||||
it->task = cset->tasks.next;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -4516,7 +4518,7 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
|
||||
struct cgroup_subsys_state *css;
|
||||
int i, ret;
|
||||
struct hlist_node *tmp;
|
||||
struct css_set *cg;
|
||||
struct css_set *cset;
|
||||
unsigned long key;
|
||||
|
||||
/* check name and function validity */
|
||||
@ -4583,17 +4585,17 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
|
||||
* this is all done under the css_set_lock.
|
||||
*/
|
||||
write_lock(&css_set_lock);
|
||||
hash_for_each_safe(css_set_table, i, tmp, cg, hlist) {
|
||||
hash_for_each_safe(css_set_table, i, tmp, cset, hlist) {
|
||||
/* skip entries that we already rehashed */
|
||||
if (cg->subsys[ss->subsys_id])
|
||||
if (cset->subsys[ss->subsys_id])
|
||||
continue;
|
||||
/* remove existing entry */
|
||||
hash_del(&cg->hlist);
|
||||
hash_del(&cset->hlist);
|
||||
/* set new value */
|
||||
cg->subsys[ss->subsys_id] = css;
|
||||
cset->subsys[ss->subsys_id] = css;
|
||||
/* recompute hash and restore entry */
|
||||
key = css_set_hash(cg->subsys);
|
||||
hash_add(css_set_table, &cg->hlist, key);
|
||||
key = css_set_hash(cset->subsys);
|
||||
hash_add(css_set_table, &cset->hlist, key);
|
||||
}
|
||||
write_unlock(&css_set_lock);
|
||||
|
||||
@ -4653,13 +4655,13 @@ void cgroup_unload_subsys(struct cgroup_subsys *ss)
|
||||
*/
|
||||
write_lock(&css_set_lock);
|
||||
list_for_each_entry(link, &dummytop->css_sets, cgrp_link_list) {
|
||||
struct css_set *cg = link->cg;
|
||||
struct css_set *cset = link->cg;
|
||||
unsigned long key;
|
||||
|
||||
hash_del(&cg->hlist);
|
||||
cg->subsys[ss->subsys_id] = NULL;
|
||||
key = css_set_hash(cg->subsys);
|
||||
hash_add(css_set_table, &cg->hlist, key);
|
||||
hash_del(&cset->hlist);
|
||||
cset->subsys[ss->subsys_id] = NULL;
|
||||
key = css_set_hash(cset->subsys);
|
||||
hash_add(css_set_table, &cset->hlist, key);
|
||||
}
|
||||
write_unlock(&css_set_lock);
|
||||
|
||||
@ -5006,7 +5008,7 @@ void cgroup_post_fork(struct task_struct *child)
|
||||
*/
|
||||
void cgroup_exit(struct task_struct *tsk, int run_callbacks)
|
||||
{
|
||||
struct css_set *cg;
|
||||
struct css_set *cset;
|
||||
int i;
|
||||
|
||||
/*
|
||||
@ -5023,7 +5025,7 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
|
||||
|
||||
/* Reassign the task to the init_css_set. */
|
||||
task_lock(tsk);
|
||||
cg = tsk->cgroups;
|
||||
cset = tsk->cgroups;
|
||||
tsk->cgroups = &init_css_set;
|
||||
|
||||
if (run_callbacks && need_forkexit_callback) {
|
||||
@ -5036,7 +5038,7 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
|
||||
|
||||
if (ss->exit) {
|
||||
struct cgroup *old_cgrp =
|
||||
rcu_dereference_raw(cg->subsys[i])->cgroup;
|
||||
rcu_dereference_raw(cset->subsys[i])->cgroup;
|
||||
struct cgroup *cgrp = task_cgroup(tsk, i);
|
||||
ss->exit(cgrp, old_cgrp, tsk);
|
||||
}
|
||||
@ -5044,7 +5046,7 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
|
||||
}
|
||||
task_unlock(tsk);
|
||||
|
||||
put_css_set_taskexit(cg);
|
||||
put_css_set_taskexit(cset);
|
||||
}
|
||||
|
||||
static void check_for_release(struct cgroup *cgrp)
|
||||
@ -5453,12 +5455,12 @@ static int current_css_set_cg_links_read(struct cgroup *cont,
|
||||
struct seq_file *seq)
|
||||
{
|
||||
struct cg_cgroup_link *link;
|
||||
struct css_set *cg;
|
||||
struct css_set *cset;
|
||||
|
||||
read_lock(&css_set_lock);
|
||||
rcu_read_lock();
|
||||
cg = rcu_dereference(current->cgroups);
|
||||
list_for_each_entry(link, &cg->cg_links, cg_link_list) {
|
||||
cset = rcu_dereference(current->cgroups);
|
||||
list_for_each_entry(link, &cset->cg_links, cg_link_list) {
|
||||
struct cgroup *c = link->cgrp;
|
||||
const char *name;
|
||||
|
||||
@ -5483,11 +5485,11 @@ static int cgroup_css_links_read(struct cgroup *cont,
|
||||
|
||||
read_lock(&css_set_lock);
|
||||
list_for_each_entry(link, &cont->css_sets, cgrp_link_list) {
|
||||
struct css_set *cg = link->cg;
|
||||
struct css_set *cset = link->cg;
|
||||
struct task_struct *task;
|
||||
int count = 0;
|
||||
seq_printf(seq, "css_set %p\n", cg);
|
||||
list_for_each_entry(task, &cg->tasks, cg_list) {
|
||||
seq_printf(seq, "css_set %p\n", cset);
|
||||
list_for_each_entry(task, &cset->tasks, cg_list) {
|
||||
if (count++ > MAX_TASKS_SHOWN_PER_CSS) {
|
||||
seq_puts(seq, " ...\n");
|
||||
break;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user