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Date: Wed, 12 Nov 2008 17:28:20 +0900
From: "Satoshi UCHIDA" <s-uchida@...jp.nec.com>
To: <linux-kernel@...r.kernel.org>,
<containers@...ts.linux-foundation.org>,
<virtualization@...ts.linux-foundation.org>,
<jens.axboe@...cle.com>, "'Ryo Tsuruta'" <ryov@...inux.co.jp>,
"'Andrea Righi'" <righi.andrea@...il.com>, <ngupta@...gle.com>,
<fernando@....ntt.co.jp>, <vtaras@...nvz.org>
Cc: "'Andrew Morton'" <akpm@...ux-foundation.org>,
"'SUGAWARA Tomoyoshi'" <tom-sugawara@...jp.nec.com>,
<menage@...gle.com>, <balbir@...ux.vnet.ibm.com>
Subject: [PATCH][cfq-cgroups][07/12] Add sibling tree control for group data(cfq_cgroup).
This patch adds a tree control for siblings of group data(cfq_cgroup).
This tree controls cfq data(cfq_data) for same group, and is used mainly
when a new group is registerecd or a existed group is unregistered.
Signed-off-by: Satoshi UCHIDA <s-uchida@...jp.nec.com>
---
block/cfq-cgroup.c | 126 +++++++++++++++++++++++++++++++++++++++++++
include/linux/cfq-iosched.h | 5 ++
include/linux/cgroup.h | 1 +
kernel/cgroup.c | 5 ++
4 files changed, 137 insertions(+), 0 deletions(-)
diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c
index ce35af2..25da08e 100644
--- a/block/cfq-cgroup.c
+++ b/block/cfq-cgroup.c
@@ -22,8 +22,12 @@ static struct cfq_ops cfq_cgroup_op;
struct cfq_cgroup {
struct cgroup_subsys_state css;
unsigned int ioprio;
+
+ struct rb_root sibling_tree;
+ unsigned int siblings;
};
+
static inline struct cfq_cgroup *cgroup_to_cfq_cgroup(struct cgroup *cont)
{
return container_of(cgroup_subsys_state(cont, cfq_subsys_id),
@@ -77,6 +81,68 @@ static void cfq_driver_sibling_tree_add(struct cfq_driver_data *cfqdd,
cfqd->cfqdd = cfqdd;
}
+static void cfq_cgroup_sibling_tree_add(struct cfq_cgroup *cfqc,
+ struct cfq_data *cfqd)
+{
+ struct rb_node **p;
+ struct rb_node *parent = NULL;
+
+ BUG_ON(!RB_EMPTY_NODE(&cfqd->group_node));
+
+ p = &cfqc->sibling_tree.rb_node;
+
+ while (*p) {
+ struct cfq_data *__cfqd;
+ struct rb_node **n;
+
+ parent = *p;
+ __cfqd = rb_entry(parent, struct cfq_data, group_node);
+
+ if (cfqd->cfqdd < __cfqd->cfqdd)
+ n = &(*p)->rb_left;
+ else
+ n = &(*p)->rb_right;
+ p = n;
+ }
+
+ rb_link_node(&cfqd->group_node, parent, p);
+ rb_insert_color(&cfqd->group_node, &cfqc->sibling_tree);
+ cfqc->siblings++;
+ cfqd->cfqc = cfqc;
+}
+
+static struct cfq_data *
+__cfq_cgroup_init_queue(struct request_queue *, struct cfq_driver_data *);
+
+static void *cfq_cgroup_init_cfq_data(struct cfq_cgroup *cfqc,
+ struct cfq_data *cfqd)
+{
+ struct cgroup *child;
+
+ /* setting cfq_data for cfq_cgroup */
+ if (!cfqc) {
+ cfqc = cgroup_to_cfq_cgroup(get_root_subsys(&cfq_subsys));
+ cfq_cgroup_sibling_tree_add(cfqc, cfqd);
+ } else {
+ struct cfq_data *__cfqd;
+ __cfqd = __cfq_cgroup_init_queue(cfqd->cfqdd->queue,
+ cfqd->cfqdd);
+ if (!__cfqd)
+ return NULL;
+ cfq_cgroup_sibling_tree_add(cfqc, __cfqd);
+ }
+
+ /* check and create cfq_data for children */
+ if (cfqc->css.cgroup)
+ list_for_each_entry(child, &cfqc->css.cgroup->children,
+ sibling){
+ cfq_cgroup_init_cfq_data(cgroup_to_cfq_cgroup(child),
+ cfqd);
+ }
+
+ return cfqc;
+}
+
static struct cfq_data *
__cfq_cgroup_init_queue(struct request_queue *q, struct cfq_driver_data *cfqdd)
{
@@ -86,9 +152,13 @@ __cfq_cgroup_init_queue(struct request_queue *q, struct cfq_driver_data *cfqdd)
return NULL;
RB_CLEAR_NODE(&cfqd->sib_node);
+ RB_CLEAR_NODE(&cfqd->group_node);
cfq_driver_sibling_tree_add(cfqd->cfqdd, cfqd);
+ if (!cfqdd)
+ cfq_cgroup_init_cfq_data(NULL, cfqd);
+
return cfqd;
}
@@ -101,6 +171,28 @@ static void *cfq_cgroup_init_queue(struct request_queue *q)
return cfqd;
}
+static void *cfq_cgroup_init_cgroup(struct cfq_cgroup *cfqc,
+ struct cgroup *parent)
+{
+ struct rb_node *p;
+ if (parent) {
+ struct cfq_cgroup *cfqc_p = cgroup_to_cfq_cgroup(parent);
+
+ p = rb_first(&cfqc_p->sibling_tree);
+ while (p) {
+ struct cfq_data *__cfqd;
+ __cfqd = rb_entry(p, struct cfq_data, group_node);
+
+ cfq_cgroup_init_cfq_data(cfqc, __cfqd);
+
+ p = rb_next(p);
+ }
+ }
+
+ return cfqc;
+}
+
+
static struct cgroup_subsys_state *
cfq_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
{
@@ -118,6 +210,12 @@ cfq_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
cfqc->ioprio = 3;
+ cfqc->sibling_tree = RB_ROOT;
+ cfqc->siblings = 0;
+
+ if (!cfq_cgroup_init_cgroup(cfqc, cont->parent))
+ return ERR_PTR(-ENOMEM);
+
return &cfqc->css;
}
@@ -132,6 +230,13 @@ static void cfq_cgroup_erase_driver_siblings(struct cfq_driver_data *cfqdd,
cfqdd->siblings--;
}
+static void cfq_cgroup_erase_cgroup_siblings(struct cfq_cgroup *cfqc,
+ struct cfq_data *cfqd)
+{
+ rb_erase(&cfqd->group_node, &cfqc->sibling_tree);
+ cfqc->siblings--;
+}
+
static void cfq_exit_device_group(struct cfq_driver_data *cfqdd)
{
struct rb_node *p, *n;
@@ -144,6 +249,7 @@ static void cfq_exit_device_group(struct cfq_driver_data *cfqdd)
cfqd = rb_entry(p, struct cfq_data, sib_node);
cfq_cgroup_erase_driver_siblings(cfqdd, cfqd);
+ cfq_cgroup_erase_cgroup_siblings(cfqd->cfqc, cfqd);
cfq_free_cfq_data(cfqd);
p = n;
@@ -159,8 +265,28 @@ static void cfq_cgroup_exit_queue(elevator_t *e)
kfree(cfqdd);
}
+static void cfq_exit_cgroup(struct cfq_cgroup *cfqc)
+{
+ struct rb_node *p, *n;
+ struct cfq_data *cfqd;
+
+ p = rb_first(&cfqc->sibling_tree);
+
+ while (p) {
+ n = rb_next(p);
+ cfqd = rb_entry(p, struct cfq_data, group_node);
+
+ cfq_cgroup_erase_driver_siblings(cfqd->cfqdd, cfqd);
+ cfq_cgroup_erase_cgroup_siblings(cfqc, cfqd);
+ cfq_free_cfq_data(cfqd);
+
+ p = n;
+ }
+}
+
static void cfq_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
{
+ cfq_exit_cgroup(cgroup_to_cfq_cgroup(cont));
kfree(cgroup_to_cfq_cgroup(cont));
}
diff --git a/include/linux/cfq-iosched.h b/include/linux/cfq-iosched.h
index 22d1aed..382fc0a 100644
--- a/include/linux/cfq-iosched.h
+++ b/include/linux/cfq-iosched.h
@@ -93,6 +93,11 @@ struct cfq_data {
#ifdef CONFIG_IOSCHED_CFQ_CGROUP
/* sibling_tree member for cfq_meta_data */
struct rb_node sib_node;
+
+ /* cfq_cgroup attribute */
+ struct cfq_cgroup *cfqc;
+ /* group_tree member for cfq_cgroup */
+ struct rb_node group_node;
#endif
};
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 8b00f66..4bfd815 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -402,6 +402,7 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task(struct cgroup *, struct task_struct *);
+struct cgroup *get_root_subsys(struct cgroup_subsys *css);
void cgroup_mm_owner_callbacks(struct task_struct *old,
struct task_struct *new);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 35eebd5..71bb335 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1316,6 +1316,11 @@ static int cgroup_tasks_write(struct cgroup *cgrp, struct cftype *cft, u64 pid)
return ret;
}
+struct cgroup *get_root_subsys(struct cgroup_subsys *css)
+{
+ return &css->root->top_cgroup;
+}
+
/* The various types of files and directories in a cgroup file system */
enum cgroup_filetype {
FILE_ROOT,
--
1.5.6.5
--
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