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Subject[PATCH 6/8] bio-cgroup: Implement the bio-cgroup
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This patch implements the bio cgroup on the memory cgroup.

Based on 2.6.27-rc5-mm1
Signed-off-by: Ryo Tsuruta <ryov@valinux.co.jp>
Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>

diff -Ndupr linux-2.6.27-rc5-mm1.cg1/block/blk-ioc.c linux-2.6.27-rc5-mm1.cg2/block/blk-ioc.c
--- linux-2.6.27-rc5-mm1.cg1/block/blk-ioc.c 2008-08-29 07:52:02.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/block/blk-ioc.c 2008-09-24 16:34:51.000000000 +0900
@@ -84,24 +84,28 @@ void exit_io_context(void)
}
}

+void init_io_context(struct io_context *ioc)
+{
+ atomic_set(&ioc->refcount, 1);
+ atomic_set(&ioc->nr_tasks, 1);
+ spin_lock_init(&ioc->lock);
+ ioc->ioprio_changed = 0;
+ ioc->ioprio = 0;
+ ioc->last_waited = jiffies; /* doesn't matter... */
+ ioc->nr_batch_requests = 0; /* because this is 0 */
+ ioc->aic = NULL;
+ INIT_RADIX_TREE(&ioc->radix_root, GFP_ATOMIC | __GFP_HIGH);
+ INIT_HLIST_HEAD(&ioc->cic_list);
+ ioc->ioc_data = NULL;
+}
+
struct io_context *alloc_io_context(gfp_t gfp_flags, int node)
{
struct io_context *ret;

ret = kmem_cache_alloc_node(iocontext_cachep, gfp_flags, node);
- if (ret) {
- atomic_set(&ret->refcount, 1);
- atomic_set(&ret->nr_tasks, 1);
- spin_lock_init(&ret->lock);
- ret->ioprio_changed = 0;
- ret->ioprio = 0;
- ret->last_waited = jiffies; /* doesn't matter... */
- ret->nr_batch_requests = 0; /* because this is 0 */
- ret->aic = NULL;
- INIT_RADIX_TREE(&ret->radix_root, GFP_ATOMIC | __GFP_HIGH);
- INIT_HLIST_HEAD(&ret->cic_list);
- ret->ioc_data = NULL;
- }
+ if (ret)
+ init_io_context(ret);

return ret;
}
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/include/linux/biocontrol.h linux-2.6.27-rc5-mm1.cg2/include/linux/biocontrol.h
--- linux-2.6.27-rc5-mm1.cg1/include/linux/biocontrol.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/include/linux/biocontrol.h 2008-09-24 16:34:51.000000000 +0900
@@ -0,0 +1,159 @@
+#include <linux/cgroup.h>
+#include <linux/mm.h>
+#include <linux/memcontrol.h>
+
+#ifndef _LINUX_BIOCONTROL_H
+#define _LINUX_BIOCONTROL_H
+
+#ifdef CONFIG_CGROUP_BIO
+
+struct io_context;
+struct block_device;
+
+struct bio_cgroup {
+ struct cgroup_subsys_state css;
+ int id;
+ struct io_context *io_context; /* default io_context */
+/* struct radix_tree_root io_context_root; per device io_context */
+ spinlock_t page_list_lock;
+ struct list_head page_list;
+};
+
+static inline int bio_cgroup_disabled(void)
+{
+ return bio_cgroup_subsys.disabled;
+}
+
+static inline struct bio_cgroup *bio_cgroup_from_task(struct task_struct *p)
+{
+ return container_of(task_subsys_state(p, bio_cgroup_subsys_id),
+ struct bio_cgroup, css);
+}
+
+static inline void __bio_cgroup_add_page(struct page_cgroup *pc)
+{
+ struct bio_cgroup *biog = pc->bio_cgroup;
+ list_add(&pc->blist, &biog->page_list);
+}
+
+static inline void bio_cgroup_add_page(struct page_cgroup *pc)
+{
+ struct bio_cgroup *biog = pc->bio_cgroup;
+ unsigned long flags;
+ spin_lock_irqsave(&biog->page_list_lock, flags);
+ __bio_cgroup_add_page(pc);
+ spin_unlock_irqrestore(&biog->page_list_lock, flags);
+}
+
+static inline void __bio_cgroup_remove_page(struct page_cgroup *pc)
+{
+ list_del_init(&pc->blist);
+}
+
+static inline void bio_cgroup_remove_page(struct page_cgroup *pc)
+{
+ struct bio_cgroup *biog = pc->bio_cgroup;
+ unsigned long flags;
+ spin_lock_irqsave(&biog->page_list_lock, flags);
+ __bio_cgroup_remove_page(pc);
+ spin_unlock_irqrestore(&biog->page_list_lock, flags);
+}
+
+static inline void get_bio_cgroup(struct bio_cgroup *biog)
+{
+ css_get(&biog->css);
+}
+
+static inline void put_bio_cgroup(struct bio_cgroup *biog)
+{
+ css_put(&biog->css);
+}
+
+static inline void set_bio_cgroup(struct page_cgroup *pc,
+ struct bio_cgroup *biog)
+{
+ pc->bio_cgroup = biog;
+}
+
+static inline void clear_bio_cgroup(struct page_cgroup *pc)
+{
+ struct bio_cgroup *biog = pc->bio_cgroup;
+ pc->bio_cgroup = NULL;
+ put_bio_cgroup(biog);
+}
+
+static inline struct bio_cgroup *get_bio_page_cgroup(struct page_cgroup *pc)
+{
+ struct bio_cgroup *biog = pc->bio_cgroup;
+ css_get(&biog->css);
+ return biog;
+}
+
+/* This sould be called in an RCU-protected section. */
+static inline struct bio_cgroup *mm_get_bio_cgroup(struct mm_struct *mm)
+{
+ struct bio_cgroup *biog;
+ biog = bio_cgroup_from_task(rcu_dereference(mm->owner));
+ get_bio_cgroup(biog);
+ return biog;
+}
+
+extern struct io_context *get_bio_cgroup_iocontext(struct bio *bio);
+
+#else /* CONFIG_CGROUP_BIO */
+
+struct bio_cgroup;
+
+static inline int bio_cgroup_disabled(void)
+{
+ return 1;
+}
+
+static inline void bio_cgroup_add_page(struct page_cgroup *pc)
+{
+}
+
+static inline void bio_cgroup_remove_page(struct page_cgroup *pc)
+{
+}
+
+static inline void get_bio_cgroup(struct bio_cgroup *biog)
+{
+}
+
+static inline void put_bio_cgroup(struct bio_cgroup *biog)
+{
+}
+
+static inline void set_bio_cgroup(struct page_cgroup *pc,
+ struct bio_cgroup *biog)
+{
+}
+
+static inline void clear_bio_cgroup(struct page_cgroup *pc)
+{
+}
+
+static inline struct bio_cgroup *get_bio_page_cgroup(struct page_cgroup *pc)
+{
+ return NULL;
+}
+
+static inline struct bio_cgroup *mm_get_bio_cgroup(struct mm_struct *mm)
+{
+ return NULL;
+}
+
+static inline int get_bio_cgroup_id(struct page *page)
+{
+ return 0;
+}
+
+static inline struct io_context *get_bio_cgroup_iocontext(struct bio *bio)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_CGROUP_BIO */
+
+#endif /* _LINUX_BIOCONTROL_H */
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/include/linux/cgroup_subsys.h linux-2.6.27-rc5-mm1.cg2/include/linux/cgroup_subsys.h
--- linux-2.6.27-rc5-mm1.cg1/include/linux/cgroup_subsys.h 2008-09-24 16:23:03.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/include/linux/cgroup_subsys.h 2008-09-24 16:34:51.000000000 +0900
@@ -43,6 +43,12 @@ SUBSYS(mem_cgroup)

/* */

+#ifdef CONFIG_CGROUP_BIO
+SUBSYS(bio_cgroup)
+#endif
+
+/* */
+
#ifdef CONFIG_CGROUP_DEVICE
SUBSYS(devices)
#endif
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/include/linux/iocontext.h linux-2.6.27-rc5-mm1.cg2/include/linux/iocontext.h
--- linux-2.6.27-rc5-mm1.cg1/include/linux/iocontext.h 2008-08-29 07:52:02.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/include/linux/iocontext.h 2008-09-24 16:34:51.000000000 +0900
@@ -83,6 +83,8 @@ struct io_context {
struct radix_tree_root radix_root;
struct hlist_head cic_list;
void *ioc_data;
+
+ int id; /* cgroup ID */
};

static inline struct io_context *ioc_task_link(struct io_context *ioc)
@@ -104,6 +106,7 @@ int put_io_context(struct io_context *io
void exit_io_context(void);
struct io_context *get_io_context(gfp_t gfp_flags, int node);
struct io_context *alloc_io_context(gfp_t gfp_flags, int node);
+void init_io_context(struct io_context *ioc);
void copy_io_context(struct io_context **pdst, struct io_context **psrc);
#else
static inline void exit_io_context(void)
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/include/linux/memcontrol.h linux-2.6.27-rc5-mm1.cg2/include/linux/memcontrol.h
--- linux-2.6.27-rc5-mm1.cg1/include/linux/memcontrol.h 2008-09-24 16:34:48.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/include/linux/memcontrol.h 2008-09-24 16:34:51.000000000 +0900
@@ -54,6 +54,10 @@ struct page_cgroup {
struct list_head lru; /* per cgroup LRU list */
struct mem_cgroup *mem_cgroup;
#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+#ifdef CONFIG_CGROUP_BIO
+ struct list_head blist; /* for bio_cgroup page list */
+ struct bio_cgroup *bio_cgroup;
+#endif
struct page *page;
int flags;
};
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/init/Kconfig linux-2.6.27-rc5-mm1.cg2/init/Kconfig
--- linux-2.6.27-rc5-mm1.cg1/init/Kconfig 2008-09-24 16:34:48.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/init/Kconfig 2008-09-24 16:34:51.000000000 +0900
@@ -425,9 +425,20 @@ config CGROUP_MEMRLIMIT_CTLR
memory RSS and Page Cache control. Virtual address space control
is provided by this controller.

+config CGROUP_BIO
+ bool "Block I/O cgroup subsystem"
+ depends on CGROUPS
+ select MM_OWNER
+ help
+ Provides a Resource Controller which enables to track the onwner
+ of every Block I/O.
+ The information this subsystem provides can be used from any
+ kind of module such as dm-ioband device mapper modules or
+ the cfq-scheduler.
+
config CGROUP_PAGE
def_bool y
- depends on CGROUP_MEM_RES_CTLR
+ depends on CGROUP_MEM_RES_CTLR || CGROUP_BIO

config SYSFS_DEPRECATED
bool
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/mm/biocontrol.c linux-2.6.27-rc5-mm1.cg2/mm/biocontrol.c
--- linux-2.6.27-rc5-mm1.cg1/mm/biocontrol.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/mm/biocontrol.c 2008-09-24 16:34:51.000000000 +0900
@@ -0,0 +1,219 @@
+/* biocontrol.c - Block I/O Controller
+ *
+ * Copyright IBM Corporation, 2007
+ * Author Balbir Singh <balbir@linux.vnet.ibm.com>
+ *
+ * Copyright 2007 OpenVZ SWsoft Inc
+ * Author: Pavel Emelianov <xemul@openvz.org>
+ *
+ * Copyright VA Linux Systems Japan, 2008
+ * Author Hirokazu Takahashi <taka@valinux.co.jp>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/cgroup.h>
+#include <linux/mm.h>
+#include <linux/blkdev.h>
+#include <linux/smp.h>
+#include <linux/bit_spinlock.h>
+#include <linux/idr.h>
+#include <linux/err.h>
+#include <linux/biocontrol.h>
+
+/* return corresponding bio_cgroup object of a cgroup */
+static inline struct bio_cgroup *cgroup_bio(struct cgroup *cgrp)
+{
+ return container_of(cgroup_subsys_state(cgrp, bio_cgroup_subsys_id),
+ struct bio_cgroup, css);
+}
+
+static struct idr bio_cgroup_id;
+static DEFINE_SPINLOCK(bio_cgroup_idr_lock);
+
+static struct cgroup_subsys_state *
+bio_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
+{
+ struct bio_cgroup *biog;
+ struct io_context *ioc;
+ int error;
+
+ if (!cgrp->parent) {
+ static struct bio_cgroup default_bio_cgroup;
+ static struct io_context default_bio_io_context;
+
+ biog = &default_bio_cgroup;
+ ioc = &default_bio_io_context;
+ init_io_context(ioc);
+
+ idr_init(&bio_cgroup_id);
+ biog->id = 0;
+
+ page_cgroup_init();
+ } else {
+ biog = kzalloc(sizeof(*biog), GFP_KERNEL);
+ ioc = alloc_io_context(GFP_KERNEL, -1);
+ if (!ioc || !biog) {
+ error = -ENOMEM;
+ goto out;
+ }
+retry:
+ if (unlikely(!idr_pre_get(&bio_cgroup_id, GFP_KERNEL))) {
+ error = -EAGAIN;
+ goto out;
+ }
+ spin_lock_irq(&bio_cgroup_idr_lock);
+ error = idr_get_new_above(&bio_cgroup_id,
+ (void *)biog, 1, &biog->id);
+ spin_unlock_irq(&bio_cgroup_idr_lock);
+ if (error == -EAGAIN)
+ goto retry;
+ else if (error)
+ goto out;
+ }
+
+ ioc->id = biog->id;
+ biog->io_context = ioc;
+
+ INIT_LIST_HEAD(&biog->page_list);
+ spin_lock_init(&biog->page_list_lock);
+
+ /* Bind the cgroup to bio_cgroup object we just created */
+ biog->css.cgroup = cgrp;
+
+ return &biog->css;
+out:
+ if (ioc)
+ put_io_context(ioc);
+ kfree(biog);
+ return ERR_PTR(error);
+}
+
+#define FORCE_UNCHARGE_BATCH (128)
+static void bio_cgroup_force_empty(struct bio_cgroup *biog)
+{
+ struct page_cgroup *pc;
+ struct page *page;
+ int count = FORCE_UNCHARGE_BATCH;
+ struct list_head *list = &biog->page_list;
+ unsigned long flags;
+
+ spin_lock_irqsave(&biog->page_list_lock, flags);
+ while (!list_empty(list)) {
+ pc = list_entry(list->prev, struct page_cgroup, blist);
+ page = pc->page;
+ get_page(page);
+ spin_unlock_irqrestore(&biog->page_list_lock, flags);
+ mem_cgroup_uncharge_page(page);
+ put_page(page);
+ if (--count <= 0) {
+ count = FORCE_UNCHARGE_BATCH;
+ cond_resched();
+ }
+ spin_lock_irqsave(&biog->page_list_lock, flags);
+ }
+ spin_unlock_irqrestore(&biog->page_list_lock, flags);
+ return;
+}
+
+static void bio_cgroup_pre_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cgrp)
+{
+ struct bio_cgroup *biog = cgroup_bio(cgrp);
+ bio_cgroup_force_empty(biog);
+}
+
+static void bio_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
+{
+ struct bio_cgroup *biog = cgroup_bio(cgrp);
+
+ put_io_context(biog->io_context);
+
+ spin_lock_irq(&bio_cgroup_idr_lock);
+ idr_remove(&bio_cgroup_id, biog->id);
+ spin_unlock_irq(&bio_cgroup_idr_lock);
+
+ kfree(biog);
+}
+
+struct bio_cgroup *find_bio_cgroup(int id)
+{
+ struct bio_cgroup *biog;
+ spin_lock_irq(&bio_cgroup_idr_lock);
+ biog = (struct bio_cgroup *)
+ idr_find(&bio_cgroup_id, id);
+ spin_unlock_irq(&bio_cgroup_idr_lock);
+ get_bio_cgroup(biog);
+ return biog;
+}
+
+struct io_context *get_bio_cgroup_iocontext(struct bio *bio)
+{
+ struct io_context *ioc;
+ struct page_cgroup *pc;
+ struct bio_cgroup *biog;
+ struct page *page = bio_iovec_idx(bio, 0)->bv_page;
+
+ lock_page_cgroup(page);
+ pc = page_get_page_cgroup(page);
+ if (pc)
+ biog = pc->bio_cgroup;
+ else
+ biog = bio_cgroup_from_task(rcu_dereference(init_mm.owner));
+ ioc = biog->io_context; /* default io_context for this cgroup */
+ atomic_inc(&ioc->refcount);
+ unlock_page_cgroup(page);
+ return ioc;
+}
+EXPORT_SYMBOL(get_bio_cgroup_iocontext);
+
+static u64 bio_id_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct bio_cgroup *biog = cgroup_bio(cgrp);
+
+ return (u64) biog->id;
+}
+
+
+static struct cftype bio_files[] = {
+ {
+ .name = "id",
+ .read_u64 = bio_id_read,
+ },
+};
+
+static int bio_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
+{
+ if (bio_cgroup_disabled())
+ return 0;
+ return cgroup_add_files(cont, ss, bio_files, ARRAY_SIZE(bio_files));
+}
+
+static void bio_cgroup_move_task(struct cgroup_subsys *ss,
+ struct cgroup *cont,
+ struct cgroup *old_cont,
+ struct task_struct *p)
+{
+ /* do nothing */
+}
+
+
+struct cgroup_subsys bio_cgroup_subsys = {
+ .name = "bio",
+ .subsys_id = bio_cgroup_subsys_id,
+ .create = bio_cgroup_create,
+ .destroy = bio_cgroup_destroy,
+ .pre_destroy = bio_cgroup_pre_destroy,
+ .populate = bio_cgroup_populate,
+ .attach = bio_cgroup_move_task,
+ .early_init = 0,
+};
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/mm/Makefile linux-2.6.27-rc5-mm1.cg2/mm/Makefile
--- linux-2.6.27-rc5-mm1.cg1/mm/Makefile 2008-09-24 16:34:48.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/mm/Makefile 2008-09-24 16:34:51.000000000 +0900
@@ -35,5 +35,6 @@ obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_SMP) += allocpercpu.o
obj-$(CONFIG_QUICKLIST) += quicklist.o
obj-$(CONFIG_CGROUP_PAGE) += memcontrol.o
+obj-$(CONFIG_CGROUP_BIO) += biocontrol.o
obj-$(CONFIG_CGROUP_MEMRLIMIT_CTLR) += memrlimitcgroup.o
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
diff -Ndupr linux-2.6.27-rc5-mm1.cg1/mm/memcontrol.c linux-2.6.27-rc5-mm1.cg2/mm/memcontrol.c
--- linux-2.6.27-rc5-mm1.cg1/mm/memcontrol.c 2008-09-24 16:34:48.000000000 +0900
+++ linux-2.6.27-rc5-mm1.cg2/mm/memcontrol.c 2008-09-24 16:34:51.000000000 +0900
@@ -20,6 +20,7 @@
#include <linux/res_counter.h>
#include <linux/memcontrol.h>
#include <linux/cgroup.h>
+#include <linux/biocontrol.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/page-flags.h>
@@ -1021,11 +1022,12 @@ struct page_cgroup *page_get_page_cgroup
* < 0 if the cgroup is over its limit
*/
static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
- gfp_t gfp_mask, enum charge_type ctype,
- struct mem_cgroup *memcg)
+ gfp_t gfp_mask, enum charge_type ctype,
+ struct mem_cgroup *memcg, struct bio_cgroup *biocg)
{
struct page_cgroup *pc;
struct mem_cgroup *mem;
+ struct bio_cgroup *biog;

pc = kmem_cache_alloc(page_cgroup_cache, gfp_mask);
if (unlikely(pc == NULL))
@@ -1037,18 +1039,15 @@ static int mem_cgroup_charge_common(stru
* thread group leader migrates. It's possible that mm is not
* set, if so charge the init_mm (happens for pagecache usage).
*/
- if (likely(!memcg)) {
- rcu_read_lock();
- mem = mm_get_mem_cgroup(mm);
- rcu_read_unlock();
- } else {
- mem = memcg;
- get_mem_cgroup(mem);
- }
+ rcu_read_lock();
+ mem = memcg ? memcg : mm_get_mem_cgroup(mm);
+ biog = biocg ? biocg : mm_get_bio_cgroup(mm);
+ rcu_read_unlock();

if (mem_cgroup_try_to_allocate(mem, gfp_mask) < 0)
goto out;
set_mem_cgroup(pc, mem);
+ set_bio_cgroup(pc, biog);
pc->page = page;
/*
* If a page is accounted as a page cache, insert to inactive list.
@@ -1067,18 +1066,21 @@ static int mem_cgroup_charge_common(stru
if (unlikely(page_get_page_cgroup(page))) {
unlock_page_cgroup(page);
clear_mem_cgroup(pc);
+ clear_bio_cgroup(pc);
kmem_cache_free(page_cgroup_cache, pc);
goto done;
}
page_assign_page_cgroup(page, pc);

mem_cgroup_add_page(pc);
+ bio_cgroup_add_page(pc);

unlock_page_cgroup(page);
done:
return 0;
out:
put_mem_cgroup(mem);
+ put_bio_cgroup(biog);
kmem_cache_free(page_cgroup_cache, pc);
err:
return -ENOMEM;
@@ -1101,7 +1103,7 @@ int mem_cgroup_charge(struct page *page,
if (unlikely(!mm))
mm = &init_mm;
return mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL);
+ MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL, NULL);
}

int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
@@ -1137,7 +1139,7 @@ int mem_cgroup_cache_charge(struct page
mm = &init_mm;

return mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_CACHE, NULL);
+ MEM_CGROUP_CHARGE_TYPE_CACHE, NULL, NULL);
}

/*
@@ -1148,7 +1150,7 @@ __mem_cgroup_uncharge_common(struct page
{
struct page_cgroup *pc;

- if (mem_cgroup_disabled())
+ if (mem_cgroup_disabled() && bio_cgroup_disabled())
return;

/*
@@ -1167,11 +1169,13 @@ __mem_cgroup_uncharge_common(struct page
goto unlock;

mem_cgroup_remove_page(pc);
+ bio_cgroup_remove_page(pc);

page_assign_page_cgroup(page, NULL);
unlock_page_cgroup(page);

clear_mem_cgroup(pc);
+ clear_bio_cgroup(pc);

kmem_cache_free(page_cgroup_cache, pc);
return;
@@ -1197,24 +1201,29 @@ int mem_cgroup_prepare_migration(struct
{
struct page_cgroup *pc;
struct mem_cgroup *mem = NULL;
+ struct bio_cgroup *biog = NULL;
enum charge_type ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED;
int ret = 0;

- if (mem_cgroup_disabled())
+ if (mem_cgroup_disabled() && bio_cgroup_disabled())
return 0;

lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
if (pc) {
mem = get_mem_page_cgroup(pc);
+ biog = get_bio_page_cgroup(pc);
if (pc->flags & PAGE_CGROUP_FLAG_CACHE)
ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
}
unlock_page_cgroup(page);
- if (mem) {
+ if (pc) {
ret = mem_cgroup_charge_common(newpage, NULL, GFP_KERNEL,
- ctype, mem);
- put_mem_cgroup(mem);
+ ctype, mem, biog);
+ if (mem)
+ put_mem_cgroup(mem);
+ if (biog)
+ put_bio_cgroup(biog);
}
return ret;
}

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  Last update: 2008-09-24 12:17    [from the cache]
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