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Subject[PATCH 4/7] enables bio-cgroup in io-throttle, have to mount together
This patch enables bio-cgroup in io-throttle, but you have to mount them together.

Signed-of-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
---
block/blk-io-throttle.c | 7 +++++--
include/linux/biotrack.h | 2 ++
include/linux/memcontrol.h | 3 ---
init/Kconfig | 2 +-
mm/biotrack.c | 35 +++++++++++++++++++++++++++++++++++
mm/memcontrol.c | 30 ------------------------------
6 files changed, 43 insertions(+), 36 deletions(-)

diff --git a/block/blk-io-throttle.c b/block/blk-io-throttle.c
index bb27587..e6a0a03 100644
--- a/block/blk-io-throttle.c
+++ b/block/blk-io-throttle.c
@@ -22,7 +22,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/res_counter.h>
-#include <linux/memcontrol.h>
+#include <linux/biotrack.h>
#include <linux/slab.h>
#include <linux/gfp.h>
#include <linux/err.h>
@@ -649,7 +649,10 @@ static struct iothrottle *get_iothrottle_from_page(struct page *page)
if (!cgrp)
return NULL;
iot = cgroup_to_iothrottle(cgrp);
- css_get(&iot->css);
+ if (iot)
+ css_get(&iot->css);
+ else
+ return NULL;
put_cgroup_from_page(page);

return iot;
diff --git a/include/linux/biotrack.h b/include/linux/biotrack.h
index d352abd..371d263 100644
--- a/include/linux/biotrack.h
+++ b/include/linux/biotrack.h
@@ -21,6 +21,8 @@ static inline void __init_bio_page_cgroup(struct page_cgroup *pc)
{
pc->bio_cgroup_id = 0;
}
+extern struct cgroup *get_cgroup_from_page(struct page *page);
+extern void put_cgroup_from_page(struct page *page);

static inline int bio_cgroup_disabled(void)
{
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 009e5e4..a7e3dc2 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -49,9 +49,6 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);

extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);

-extern struct cgroup *get_cgroup_from_page(struct page *page);
-extern void put_cgroup_from_page(struct page *page);
-
#define mm_match_cgroup(mm, cgroup) \
((cgroup) == mem_cgroup_from_task((mm)->owner))

diff --git a/init/Kconfig b/init/Kconfig
index 06649c5..4082e8e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -315,7 +315,7 @@ config CGROUP_DEVICE

config CGROUP_IO_THROTTLE
bool "Enable cgroup I/O throttling (EXPERIMENTAL)"
- depends on CGROUPS && CGROUP_MEM_RES_CTLR && RESOURCE_COUNTERS && EXPERIMENTAL
+ depends on CGROUPS && CGROUP_BIO && RESOURCE_COUNTERS && EXPERIMENTAL
help
This allows to limit the maximum I/O bandwidth for specific
cgroup(s).
diff --git a/mm/biotrack.c b/mm/biotrack.c
index 1af5910..ba6b45b 100644
--- a/mm/biotrack.c
+++ b/mm/biotrack.c
@@ -213,6 +213,41 @@ static struct bio_cgroup *find_bio_cgroup(int id)
return biog;
}

+struct cgroup *get_cgroup_from_page(struct page *page)
+{
+ struct page_cgroup *pc;
+ struct bio_cgroup *biog;
+ struct cgroup *cgrp = NULL;
+
+ pc = lookup_page_cgroup(page);
+ if (pc) {
+ lock_page_cgroup(pc);
+ biog = find_bio_cgroup(pc->bio_cgroup_id);
+ if (biog) {
+ css_get(&biog->css);
+ cgrp = biog->css.cgroup;
+ }
+ unlock_page_cgroup(pc);
+ }
+
+ return cgrp;
+}
+
+void put_cgroup_from_page(struct page *page)
+{
+ struct bio_cgroup *biog;
+ struct page_cgroup *pc;
+
+ pc = lookup_page_cgroup(page);
+ if (pc) {
+ lock_page_cgroup(pc);
+ biog = find_bio_cgroup(pc->bio_cgroup_id);
+ if (biog)
+ css_put(&biog->css);
+ unlock_page_cgroup(pc);
+ }
+}
+
/* Determine the bio-cgroup id of a given bio. */
int get_bio_cgroup_id(struct bio *bio)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 097278c..95048fe 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -241,36 +241,6 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
struct mem_cgroup, css);
}

-struct cgroup *get_cgroup_from_page(struct page *page)
-{
- struct page_cgroup *pc;
- struct cgroup *cgrp = NULL;
-
- pc = lookup_page_cgroup(page);
- if (pc) {
- lock_page_cgroup(pc);
- if(pc->mem_cgroup) {
- css_get(&pc->mem_cgroup->css);
- cgrp = pc->mem_cgroup->css.cgroup;
- }
- unlock_page_cgroup(pc);
- }
-
- return cgrp;
-}
-
-void put_cgroup_from_page(struct page *page)
-{
- struct page_cgroup *pc;
-
- pc = lookup_page_cgroup(page);
- if (pc) {
- lock_page_cgroup(pc);
- css_put(&pc->mem_cgroup->css);
- unlock_page_cgroup(pc);
- }
-}
-
static void __mem_cgroup_remove_list(struct mem_cgroup_per_zone *mz,
struct page_cgroup *pc)
{
-- 1.5.4.rc3


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