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Message-Id: <008501c893dc$3206e520$9614af60$@jp.nec.com>
Date: Tue, 1 Apr 2008 18:38:52 +0900
From: "Satoshi UCHIDA" <s-uchida@...jp.nec.com>
To: <linux-kernel@...r.kernel.org>,
<containers@...ts.linux-foundation.org>, <axboe@...nel.dk>,
<menage@...gle.com>
Cc: <s-uchida@...jp.nec.com>, <tom-sugawara@...jp.nec.com>,
<m-takahashi@...jp.nec.com>
Subject: [RFC][patch 8/11][CFQ-cgroup] Control cfq_data per cgroup
This patch expands cfq data to handling multi cfq_data in group.
This control is used rb_tree and the key is used a pointer of cfq_meta_data.
Signed-off-by: Satoshi UCHIDA <uchida@...jp.nec.com>
diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c
index 55090dc..4110ab7 100644
--- a/block/cfq-cgroup.c
+++ b/block/cfq-cgroup.c
@@ -23,6 +23,9 @@ static const int cfq_cgroup_slice_idle = HZ / 125;
struct cfq_cgroup {
struct cgroup_subsys_state css;
unsigned int ioprio;
+
+ struct rb_root sibling_tree;
+ unsigned int siblings;
};
@@ -35,6 +38,8 @@ static inline struct cfq_cgroup *cgroup_to_cfq_cgroup(struct cgroup *cont)
/*
* Add device or cgroup data functions.
*/
+struct cfq_data *__cfq_cgroup_init_queue(struct request_queue *q, void *data);
+
static struct cfq_meta_data *cfq_cgroup_init_meta_data(struct cfq_data *cfqd, struct request_queue *q)
{
struct cfq_meta_data *cfqmd;
@@ -90,16 +95,75 @@ static void cfq_meta_data_sibling_tree_add(struct cfq_meta_data *cfqmd,
cfqmd->siblings++;
cfqd->cfqmd = cfqmd;
}
-
+
+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->cfqmd < __cfqd->cfqmd) {
+ 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 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_cgroup_subsys));
+ cfq_cgroup_sibling_tree_add(cfqc, cfqd);
+ } else {
+ struct cfq_data *__cfqd;
+ __cfqd = __cfq_cgroup_init_queue(CFQ_DRV_UNIQ_DATA(cfqd).queue, cfqd->cfqmd);
+ 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, children){
+ cfq_cgroup_init_cfq_data(cgroup_to_cfq_cgroup(child), cfqd);
+ }
+
+ return cfqc;
+}
+
+
struct cfq_data *__cfq_cgroup_init_queue(struct request_queue *q, void *data)
{
struct cfq_meta_data *cfqmd = (struct cfq_meta_data *)data;
struct cfq_data *cfqd = __cfq_init_cfq_data(q);
+ int root = 0;
if (!cfqd)
return NULL;
RB_CLEAR_NODE(&cfqd->sib_node);
+ RB_CLEAR_NODE(&cfqd->group_node);
if (!cfqmd) {
cfqmd = cfq_cgroup_init_meta_data(cfqd, q);
@@ -107,12 +171,35 @@ struct cfq_data *__cfq_cgroup_init_queue(struct request_queue *q, void *data)
kfree(cfqd);
return NULL;
}
+ root = 1;
}
cfq_meta_data_sibling_tree_add(cfqmd, cfqd);
+ if (root)
+ cfq_cgroup_init_cfq_data(NULL, cfqd);
+
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 != NULL) {
+ 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)
@@ -130,6 +217,11 @@ cfq_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
return ERR_PTR(-ENOMEM);
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;
}
@@ -144,6 +236,12 @@ static void cfq_cgroup_erase_meta_data_siblings(struct cfq_meta_data *cfqmd, str
cfqmd->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_meta_data *cfqmd)
{
struct rb_node *p, *n;
@@ -156,6 +254,7 @@ static void cfq_exit_device_group(struct cfq_meta_data *cfqmd)
cfqd = rb_entry(p, struct cfq_data, sib_node);
cfq_cgroup_erase_meta_data_siblings(cfqmd, cfqd);
+ cfq_cgroup_erase_cgroup_siblings(cfqd->cfqc, cfqd);
__cfq_exit_data(cfqd);
p = n;
@@ -170,8 +269,28 @@ static void __cfq_cgroup_exit_data(struct cfq_data *cfqd)
kfree(cfqmd);
}
+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_meta_data_siblings(cfqd->cfqmd, cfqd);
+ cfq_cgroup_erase_cgroup_siblings(cfqc, cfqd);
+ __cfq_exit_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 c8879a7..93256ce 100644
--- a/include/linux/cfq-iosched.h
+++ b/include/linux/cfq-iosched.h
@@ -94,10 +94,16 @@ struct cfq_data {
struct list_head cic_list;
#ifdef CONFIG_CGROUP_CFQ
+ /* device unique attribute */
struct cfq_meta_data *cfqmd;
/* 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;
+
#else
struct cfq_driver_data cfq_driv_d;
#endif
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 785a01c..6423951 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -356,6 +356,7 @@ 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);
#else /* !CONFIG_CGROUPS */
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e8e8ec4..1ef1de7 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1290,6 +1290,12 @@ static int attach_task_by_pid(struct cgroup *cgrp, char *pidbuf)
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,
--
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