The patch titled
cgroups: add an owner to the mm_struct
has been added to the -mm tree. Its filename is
cgroups-add-an-owner-to-the-mm_struct.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cgroups: add an owner to the mm_struct
From: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Remove the mem_cgroup member from mm_struct and instead adds an owner.
This approach was suggested by Paul Menage. The advantage of this approach
is that, once the mm->owner is known, using the subsystem id, the cgroup
can be determined. It also allows several control groups that are
virtually grouped by mm_struct, to exist independent of the memory
controller i.e., without adding mem_cgroup's for each controller, to
mm_struct.
A new config option CONFIG_MM_OWNER is added and the memory resource
controller selects this config option.
This patch also adds cgroup callbacks to notify subsystems when mm->owner
changes. The mm_cgroup_changed callback is called with the task_lock() of
the new task held and is called just prior to changing the mm->owner.
I am indebted to Paul Menage for the several reviews of this patchset and
helping me make it lighter and simpler.
This patch was tested on a powerpc box, it was compiled with both the
MM_OWNER config turned on and off.
After the thread group leader exits, it's moved to init_css_state by
cgroup_exit(), thus all future charges from runnings threads would be
redirected to the init_css_set's subsystem.
Signed-off-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: Pavel Emelianov <xemul@xxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Cc: Sudhir Kumar <skumar@xxxxxxxxxxxxxxxxxx>
Cc: YAMAMOTO Takashi <yamamoto@xxxxxxxxxxxxx>
Cc: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>,
Cc: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Reviewed-by: Paul Menage <menage@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/exec.c | 1
include/linux/cgroup.h | 15 ++++++
include/linux/memcontrol.h | 16 +-----
include/linux/mm_types.h | 5 +-
include/linux/sched.h | 13 +++++
init/Kconfig | 7 ++
init/main.c | 1
kernel/cgroup.c | 30 ++++++++++++
kernel/exit.c | 83 +++++++++++++++++++++++++++++++++++
kernel/fork.c | 11 +++-
mm/memcontrol.c | 28 ++---------
11 files changed, 169 insertions(+), 41 deletions(-)
diff -puN fs/exec.c~cgroups-add-an-owner-to-the-mm_struct fs/exec.c
--- a/fs/exec.c~cgroups-add-an-owner-to-the-mm_struct
+++ a/fs/exec.c
@@ -735,6 +735,7 @@ static int exec_mmap(struct mm_struct *m
tsk->active_mm = mm;
activate_mm(active_mm, mm);
task_unlock(tsk);
+ mm_update_next_owner(mm);
arch_pick_mmap_layout(mm);
if (old_mm) {
up_read(&old_mm->mmap_sem);
diff -puN include/linux/cgroup.h~cgroups-add-an-owner-to-the-mm_struct include/linux/cgroup.h
--- a/include/linux/cgroup.h~cgroups-add-an-owner-to-the-mm_struct
+++ a/include/linux/cgroup.h
@@ -305,6 +305,12 @@ struct cgroup_subsys {
struct cgroup *cgrp);
void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);
void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
+ /*
+ * This routine is called with the task_lock of mm->owner held
+ */
+ void (*mm_owner_changed)(struct cgroup_subsys *ss,
+ struct cgroup *old,
+ struct cgroup *new);
int subsys_id;
int active;
int disabled;
@@ -390,4 +396,13 @@ static inline int cgroupstats_build(stru
#endif /* !CONFIG_CGROUPS */
+#ifdef CONFIG_MM_OWNER
+extern void
+cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new);
+#else /* !CONFIG_MM_OWNER */
+static inline void
+cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
+{
+}
+#endif /* CONFIG_MM_OWNER */
#endif /* _LINUX_CGROUP_H */
diff -puN include/linux/memcontrol.h~cgroups-add-an-owner-to-the-mm_struct include/linux/memcontrol.h
--- a/include/linux/memcontrol.h~cgroups-add-an-owner-to-the-mm_struct
+++ a/include/linux/memcontrol.h
@@ -27,9 +27,6 @@ struct mm_struct;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-extern void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p);
-extern void mm_free_cgroup(struct mm_struct *mm);
-
#define page_reset_bad_cgroup(page) ((page)->page_cgroup = 0)
extern struct page_cgroup *page_get_page_cgroup(struct page *page);
@@ -48,8 +45,10 @@ extern unsigned long mem_cgroup_isolate_
extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
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);
+
#define mm_match_cgroup(mm, cgroup) \
- ((cgroup) == rcu_dereference((mm)->mem_cgroup))
+ ((cgroup) == mem_cgroup_from_task((mm)->owner))
extern int mem_cgroup_prepare_migration(struct page *page);
extern void mem_cgroup_end_migration(struct page *page);
@@ -73,15 +72,6 @@ extern long mem_cgroup_calc_reclaim_inac
struct zone *zone, int priority);
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
-static inline void mm_init_cgroup(struct mm_struct *mm,
- struct task_struct *p)
-{
-}
-
-static inline void mm_free_cgroup(struct mm_struct *mm)
-{
-}
-
static inline void page_reset_bad_cgroup(struct page *page)
{
}
diff -puN include/linux/mm_types.h~cgroups-add-an-owner-to-the-mm_struct include/linux/mm_types.h
--- a/include/linux/mm_types.h~cgroups-add-an-owner-to-the-mm_struct
+++ a/include/linux/mm_types.h
@@ -225,8 +225,9 @@ struct mm_struct {
/* aio bits */
rwlock_t ioctx_list_lock; /* aio lock */
struct kioctx *ioctx_list;
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
- struct mem_cgroup *mem_cgroup;
+#ifdef CONFIG_MM_OWNER
+ struct task_struct *owner; /* The thread group leader that */
+ /* owns the mm_struct. */
#endif
};
diff -puN include/linux/sched.h~cgroups-add-an-owner-to-the-mm_struct include/linux/sched.h
--- a/include/linux/sched.h~cgroups-add-an-owner-to-the-mm_struct
+++ a/include/linux/sched.h
@@ -2165,6 +2165,19 @@ static inline void migration_init(void)
#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
+#ifdef CONFIG_MM_OWNER
+extern void mm_update_next_owner(struct mm_struct *mm);
+extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
+#else
+static inline void mm_update_next_owner(struct mm_struct *mm)
+{
+}
+
+static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
+{
+}
+#endif /* CONFIG_MM_OWNER */
+
#endif /* __KERNEL__ */
#endif
diff -puN init/Kconfig~cgroups-add-an-owner-to-the-mm_struct init/Kconfig
--- a/init/Kconfig~cgroups-add-an-owner-to-the-mm_struct
+++ a/init/Kconfig
@@ -371,9 +371,13 @@ config RESOURCE_COUNTERS
infrastructure that works with cgroups
depends on CGROUPS
+config MM_OWNER
+ bool
+
config CGROUP_MEM_RES_CTLR
bool "Memory Resource Controller for Control Groups"
depends on CGROUPS && RESOURCE_COUNTERS
+ select MM_OWNER
help
Provides a memory resource controller that manages both page cache and
RSS memory.
@@ -386,6 +390,9 @@ config CGROUP_MEM_RES_CTLR
Only enable when you're ok with these trade offs and really
sure you need the memory resource controller.
+ This config option also selects MM_OWNER config option, which
+ could in turn add some fork/exit overhead.
+
config SYSFS_DEPRECATED
bool
diff -puN init/main.c~cgroups-add-an-owner-to-the-mm_struct init/main.c
--- a/init/main.c~cgroups-add-an-owner-to-the-mm_struct
+++ a/init/main.c
@@ -557,6 +557,7 @@ asmlinkage void __init start_kernel(void
printk(KERN_NOTICE);
printk(linux_banner);
setup_arch(&command_line);
+ mm_init_owner(&init_mm, &init_task);
setup_command_line(command_line);
unwind_setup();
setup_per_cpu_areas();
diff -puN kernel/cgroup.c~cgroups-add-an-owner-to-the-mm_struct kernel/cgroup.c
--- a/kernel/cgroup.c~cgroups-add-an-owner-to-the-mm_struct
+++ a/kernel/cgroup.c
@@ -119,6 +119,7 @@ static int root_count;
* be called.
*/
static int need_forkexit_callback;
+static int need_mm_owner_callback __read_mostly;
/* convenient tests for these bits */
inline int cgroup_is_removed(const struct cgroup *cgrp)
@@ -2493,6 +2494,7 @@ static void __init cgroup_init_subsys(st
init_css_set.subsys[ss->subsys_id] = dummytop->subsys[ss->subsys_id];
need_forkexit_callback |= ss->fork || ss->exit;
+ need_mm_owner_callback |= !!ss->mm_owner_changed;
/* At system boot, before all subsystems have been
* registered, no tasks have been forked, so we don't
@@ -2743,6 +2745,34 @@ void cgroup_fork_callbacks(struct task_s
}
}
+#ifdef CONFIG_MM_OWNER
+/**
+ * cgroup_mm_owner_callbacks - run callbacks when the mm->owner changes
+ * @p: the new owner
+ *
+ * Called on every change to mm->owner. mm_init_owner() does not
+ * invoke this routine, since it assigns the mm->owner the first time
+ * and does not change it.
+ */
+void cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
+{
+ struct cgroup *oldcgrp, *newcgrp;
+
+ if (need_mm_owner_callback) {
+ int i;
+ for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
+ struct cgroup_subsys *ss = subsys[i];
+ oldcgrp = task_cgroup(old, ss->subsys_id);
+ newcgrp = task_cgroup(new, ss->subsys_id);
+ if (oldcgrp == newcgrp)
+ continue;
+ if (ss->mm_owner_changed)
+ ss->mm_owner_changed(ss, oldcgrp, newcgrp);
+ }
+ }
+}
+#endif /* CONFIG_MM_OWNER */
+
/**
* cgroup_post_fork - called on a new task after adding it to the task list
* @child: the task in question
diff -puN kernel/exit.c~cgroups-add-an-owner-to-the-mm_struct kernel/exit.c
--- a/kernel/exit.c~cgroups-add-an-owner-to-the-mm_struct
+++ a/kernel/exit.c
@@ -574,6 +574,88 @@ void exit_fs(struct task_struct *tsk)
EXPORT_SYMBOL_GPL(exit_fs);
+#ifdef CONFIG_MM_OWNER
+/*
+ * Task p is exiting and it owned mm, lets find a new owner for it
+ */
+static inline int
+mm_need_new_owner(struct mm_struct *mm, struct task_struct *p)
+{
+ /*
+ * If there are other users of the mm and the owner (us) is exiting
+ * we need to find a new owner to take on the responsibility.
+ */
+ if (!mm)
+ return 0;
+ if (atomic_read(&mm->mm_users) <= 1)
+ return 0;
+ if (mm->owner != p)
+ return 0;
+ return 1;
+}
+
+void mm_update_next_owner(struct mm_struct *mm)
+{
+ struct task_struct *c, *g, *p = current;
+
+retry:
+ if (!mm_need_new_owner(mm, p))
+ return;
+
+ read_lock(&tasklist_lock);
+ /*
+ * Search in the children
+ */
+ list_for_each_entry(c, &p->children, sibling) {
+ if (c->mm == mm)
+ goto assign_new_owner;
+ }
+
+ /*
+ * Search in the siblings
+ */
+ list_for_each_entry(c, &p->parent->children, sibling) {
+ if (c->mm == mm)
+ goto assign_new_owner;
+ }
+
+ /*
+ * Search through everything else. We should not get
+ * here often
+ */
+ do_each_thread(g, c) {
+ if (c->mm == mm)
+ goto assign_new_owner;
+ } while_each_thread(g, c);
+
+ read_unlock(&tasklist_lock);
+ return;
+
+assign_new_owner:
+ BUG_ON(c == p);
+ get_task_struct(c);
+ /*
+ * The task_lock protects c->mm from changing.
+ * We always want mm->owner->mm == mm
+ */
+ task_lock(c);
+ /*
+ * Delay read_unlock() till we have the task_lock()
+ * to ensure that c does not slip away underneath us
+ */
+ read_unlock(&tasklist_lock);
+ if (c->mm != mm) {
+ task_unlock(c);
+ put_task_struct(c);
+ goto retry;
+ }
+ cgroup_mm_owner_callbacks(mm->owner, c);
+ mm->owner = c;
+ task_unlock(c);
+ put_task_struct(c);
+}
+#endif /* CONFIG_MM_OWNER */
+
/*
* Turn us into a lazy TLB process if we
* aren't already..
@@ -613,6 +695,7 @@ static void exit_mm(struct task_struct *
/* We don't want this task to be frozen prematurely */
clear_freeze_flag(tsk);
task_unlock(tsk);
+ mm_update_next_owner(mm);
mmput(mm);
}
diff -puN kernel/fork.c~cgroups-add-an-owner-to-the-mm_struct kernel/fork.c
--- a/kernel/fork.c~cgroups-add-an-owner-to-the-mm_struct
+++ a/kernel/fork.c
@@ -358,14 +358,13 @@ static struct mm_struct * mm_init(struct
mm->ioctx_list = NULL;
mm->free_area_cache = TASK_UNMAPPED_BASE;
mm->cached_hole_size = ~0UL;
- mm_init_cgroup(mm, p);
+ mm_init_owner(mm, p);
if (likely(!mm_alloc_pgd(mm))) {
mm->def_flags = 0;
return mm;
}
- mm_free_cgroup(mm);
free_mm(mm);
return NULL;
}
@@ -415,7 +414,6 @@ void mmput(struct mm_struct *mm)
spin_unlock(&mmlist_lock);
}
put_swap_token(mm);
- mm_free_cgroup(mm);
mmdrop(mm);
}
}
@@ -993,6 +991,13 @@ static void rt_mutex_init_task(struct ta
#endif
}
+#ifdef CONFIG_MM_OWNER
+void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
+{
+ mm->owner = p;
+}
+#endif /* CONFIG_MM_OWNER */
+
/*
* This creates a new process as a copy of the old one,
* but does not actually start it yet.
diff -puN mm/memcontrol.c~cgroups-add-an-owner-to-the-mm_struct mm/memcontrol.c
--- a/mm/memcontrol.c~cgroups-add-an-owner-to-the-mm_struct
+++ a/mm/memcontrol.c
@@ -236,26 +236,12 @@ static struct mem_cgroup *mem_cgroup_fro
css);
}
-static struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
+struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
{
return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
struct mem_cgroup, css);
}
-void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p)
-{
- struct mem_cgroup *mem;
-
- mem = mem_cgroup_from_task(p);
- css_get(&mem->css);
- mm->mem_cgroup = mem;
-}
-
-void mm_free_cgroup(struct mm_struct *mm)
-{
- css_put(&mm->mem_cgroup->css);
-}
-
static inline int page_cgroup_locked(struct page *page)
{
return bit_spin_is_locked(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
@@ -476,6 +462,7 @@ unsigned long mem_cgroup_isolate_pages(u
int zid = zone_idx(z);
struct mem_cgroup_per_zone *mz;
+ BUG_ON(!mem_cont);
mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
if (active)
src = &mz->active_list;
@@ -574,7 +561,7 @@ retry:
mm = &init_mm;
rcu_read_lock();
- mem = rcu_dereference(mm->mem_cgroup);
+ mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
/*
* For every charge from the cgroup, increment reference count
*/
@@ -985,10 +972,9 @@ mem_cgroup_create(struct cgroup_subsys *
struct mem_cgroup *mem;
int node;
- if (unlikely((cont->parent) == NULL)) {
+ if (unlikely((cont->parent) == NULL))
mem = &init_mem_cgroup;
- init_mm.mem_cgroup = mem;
- } else
+ else
mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
if (mem == NULL)
@@ -1067,10 +1053,6 @@ static void mem_cgroup_move_task(struct
if (!thread_group_leader(p))
goto out;
- css_get(&mem->css);
- rcu_assign_pointer(mm->mem_cgroup, mem);
- css_put(&old_mem->css);
-
out:
mmput(mm);
}
_
Patches currently in -mm which might be from balbir@xxxxxxxxxxxxxxxxxx are
memcg-fix-oops-in-oom-handling.patch
git-sched.patch
oom_kill-remove-unused-parameter-in-badness.patch
cgroups-use-a-hash-table-for-css_set-finding.patch
cgroups-simplify-init_subsys.patch
cgroups-remove-the-css_set-linked-list.patch
cgroups-add-an-owner-to-the-mm_struct.patch
memcgroup-add-the-max_usage-member-on-the-res_counter.patch
add-a-document-describing-the-resource-counter-abstraction-v2.patch
add-a-document-describing-the-resource-counter-abstraction-v2-fix.patch
memcgroup-move-memory-controller-allocations-to-their-own-slabs.patch
memcgroup-make-the-memory-controller-more-desktop-responsive.patch
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