[v4,2/9] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations
diff mbox series

Message ID 20190910233146.206080-3-almasrymina@google.com
State New
Headers show
Series
  • hugetlb_cgroup: Add hugetlb_cgroup reservation limits
Related show

Commit Message

Mina Almasry Sept. 10, 2019, 11:31 p.m. UTC
Augements hugetlb_cgroup_charge_cgroup to be able to charge hugetlb
usage or hugetlb reservation counter.

Adds a new interface to uncharge a hugetlb_cgroup counter via
hugetlb_cgroup_uncharge_counter.

Integrates the counter with hugetlb_cgroup, via hugetlb_cgroup_init,
hugetlb_cgroup_have_usage, and hugetlb_cgroup_css_offline.

Signed-off-by: Mina Almasry <almasrymina@google.com>
---
 include/linux/hugetlb_cgroup.h | 13 ++++--
 mm/hugetlb.c                   |  6 ++-
 mm/hugetlb_cgroup.c            | 82 +++++++++++++++++++++++++++-------
 3 files changed, 80 insertions(+), 21 deletions(-)

--
2.23.0.162.g0b9fbb3734-goog

Comments

shuah Sept. 17, 2019, 1:29 a.m. UTC | #1
On 9/10/19 5:31 PM, Mina Almasry wrote:
> Augements hugetlb_cgroup_charge_cgroup to be able to charge hugetlb
> usage or hugetlb reservation counter.
> 

Augments?

> Adds a new interface to uncharge a hugetlb_cgroup counter via
> hugetlb_cgroup_uncharge_counter.
> 
> Integrates the counter with hugetlb_cgroup, via hugetlb_cgroup_init,
> hugetlb_cgroup_have_usage, and hugetlb_cgroup_css_offline.
> 
> Signed-off-by: Mina Almasry <almasrymina@google.com>
> ---
>   include/linux/hugetlb_cgroup.h | 13 ++++--
>   mm/hugetlb.c                   |  6 ++-
>   mm/hugetlb_cgroup.c            | 82 +++++++++++++++++++++++++++-------
>   3 files changed, 80 insertions(+), 21 deletions(-)
> 
> diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
> index 063962f6dfc6a..c467715dd8fb8 100644
> --- a/include/linux/hugetlb_cgroup.h
> +++ b/include/linux/hugetlb_cgroup.h
> @@ -52,14 +52,19 @@ static inline bool hugetlb_cgroup_disabled(void)
>   }
> 
>   extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
> -					struct hugetlb_cgroup **ptr);
> +					struct hugetlb_cgroup **ptr,
> +					bool reserved);
>   extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
>   					 struct hugetlb_cgroup *h_cg,
>   					 struct page *page);
>   extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
>   					 struct page *page);
>   extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
> -					   struct hugetlb_cgroup *h_cg);
> +					   struct hugetlb_cgroup *h_cg,
> +					   bool reserved);
> +extern void hugetlb_cgroup_uncharge_counter(struct page_counter *p,
> +					    unsigned long nr_pages);
> +
>   extern void hugetlb_cgroup_file_init(void) __init;
>   extern void hugetlb_cgroup_migrate(struct page *oldhpage,
>   				   struct page *newhpage);
> @@ -83,7 +88,7 @@ static inline bool hugetlb_cgroup_disabled(void)
> 
>   static inline int
>   hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
> -			     struct hugetlb_cgroup **ptr)
> +			     struct hugetlb_cgroup **ptr, bool reserved)
Please line the arguments.

>   {
>   	return 0;
>   }
> @@ -102,7 +107,7 @@ hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
> 
>   static inline void
>   hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
> -			       struct hugetlb_cgroup *h_cg)
> +			       struct hugetlb_cgroup *h_cg, bool reserved)

Same here.

>   {
>   }
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 6d7296dd11b83..e975f55aede94 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -2078,7 +2078,8 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
>   			gbl_chg = 1;
>   	}
> 
> -	ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg);
> +	ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg,
> +					   false);
>   	if (ret)
>   		goto out_subpool_put;
> 
> @@ -2126,7 +2127,8 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
>   	return page;
> 
>   out_uncharge_cgroup:
> -	hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg);
> +	hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg,
> +			false);

Please be consistent with indentation. Line this up like you did above.

>   out_subpool_put:
>   	if (map_chg || avoid_reserve)
>   		hugepage_subpool_put_pages(spool, 1);
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> index 51a72624bd1ff..2ab36a98d834e 100644
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -38,8 +38,8 @@ struct hugetlb_cgroup {
>   static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
> 
>   static inline
> -struct page_counter *hugetlb_cgroup_get_counter(struct hugetlb_cgroup *h_cg, int idx,
> -				 bool reserved)
> +struct page_counter *hugetlb_cgroup_get_counter(struct hugetlb_cgroup *h_cg,
> +						int idx, bool reserved)

Same here.

>   {
>   	if (reserved)
>   		return  &h_cg->reserved_hugepage[idx];
> @@ -74,8 +74,12 @@ static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
>   	int idx;
> 
>   	for (idx = 0; idx < hugetlb_max_hstate; idx++) {
> -		if (page_counter_read(&h_cg->hugepage[idx]))
> +		if (page_counter_read(hugetlb_cgroup_get_counter(h_cg, idx,
> +						true)) ||
> +		    page_counter_read(hugetlb_cgroup_get_counter(h_cg, idx,
> +				    false))) {
>   			return true;
> +		}
>   	}
>   	return false;
>   }
> @@ -86,18 +90,30 @@ static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
>   	int idx;
> 
>   	for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) {
> -		struct page_counter *counter = &h_cgroup->hugepage[idx];
>   		struct page_counter *parent = NULL;
> +		struct page_counter *reserved_parent = NULL;
>   		unsigned long limit;
>   		int ret;
> 
> -		if (parent_h_cgroup)
> -			parent = &parent_h_cgroup->hugepage[idx];
> -		page_counter_init(counter, parent);
> +		if (parent_h_cgroup) {
> +			parent = hugetlb_cgroup_get_counter(
> +					parent_h_cgroup, idx, false);
> +			reserved_parent = hugetlb_cgroup_get_counter(
> +					parent_h_cgroup, idx, true);
> +		}
> +		page_counter_init(hugetlb_cgroup_get_counter(
> +					h_cgroup, idx, false), parent);
> +		page_counter_init(hugetlb_cgroup_get_counter(
> +					h_cgroup, idx, true),
> +				  reserved_parent);
> 
>   		limit = round_down(PAGE_COUNTER_MAX,
>   				   1 << huge_page_order(&hstates[idx]));
> -		ret = page_counter_set_max(counter, limit);
> +
> +		ret = page_counter_set_max(hugetlb_cgroup_get_counter(
> +					h_cgroup, idx, false), limit);
> +		ret = page_counter_set_max(hugetlb_cgroup_get_counter(
> +					h_cgroup, idx, true), limit);
>   		VM_BUG_ON(ret);
>   	}
>   }
> @@ -127,6 +143,26 @@ static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
>   	kfree(h_cgroup);
>   }
> 
> +static void hugetlb_cgroup_move_parent_reservation(int idx,
> +						   struct hugetlb_cgroup *h_cg)
> +{
> +	struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg);
> +
> +	/* Move the reservation counters. */
> +	if (!parent_hugetlb_cgroup(h_cg)) {
> +		parent = root_h_cgroup;
> +		/* root has no limit */
> +		page_counter_charge(
> +				&root_h_cgroup->reserved_hugepage[idx],
> +				page_counter_read(hugetlb_cgroup_get_counter(
> +						h_cg, idx, true)));
> +	}
> +
> +	/* Take the pages off the local counter */
> +	page_counter_cancel(hugetlb_cgroup_get_counter(h_cg, idx, true),
> +			    page_counter_read(hugetlb_cgroup_get_counter(h_cg,
> +					    idx, true)));
> +}
> 
>   /*
>    * Should be called with hugetlb_lock held.
> @@ -181,6 +217,7 @@ static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
>   	do {
>   		for_each_hstate(h) {
>   			spin_lock(&hugetlb_lock);
> +			hugetlb_cgroup_move_parent_reservation(idx, h_cg);
>   			list_for_each_entry(page, &h->hugepage_activelist, lru)
>   				hugetlb_cgroup_move_parent(idx, h_cg, page);
> 
> @@ -192,7 +229,7 @@ static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
>   }
> 
>   int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
> -				 struct hugetlb_cgroup **ptr)
> +				 struct hugetlb_cgroup **ptr, bool reserved)
>   {
>   	int ret = 0;
>   	struct page_counter *counter;
> @@ -215,8 +252,11 @@ int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
>   	}
>   	rcu_read_unlock();
> 
> -	if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter))
> +	if (!page_counter_try_charge(hugetlb_cgroup_get_counter(h_cg, idx,
> +								reserved),
> +				     nr_pages, &counter)) {
>   		ret = -ENOMEM;
> +	}
>   	css_put(&h_cg->css);
>   done:
>   	*ptr = h_cg;
> @@ -250,12 +290,14 @@ void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
>   	if (unlikely(!h_cg))
>   		return;
>   	set_hugetlb_cgroup(page, NULL);
> -	page_counter_uncharge(&h_cg->hugepage[idx], nr_pages);
> +	page_counter_uncharge(hugetlb_cgroup_get_counter(h_cg, idx, false),
> +			nr_pages);
> +
>   	return;
>   }
> 
>   void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
> -				    struct hugetlb_cgroup *h_cg)
> +				    struct hugetlb_cgroup *h_cg, bool reserved)
>   {
>   	if (hugetlb_cgroup_disabled() || !h_cg)
>   		return;
> @@ -263,8 +305,17 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
>   	if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
>   		return;
> 
> -	page_counter_uncharge(&h_cg->hugepage[idx], nr_pages);
> -	return;
> +	page_counter_uncharge(hugetlb_cgroup_get_counter(h_cg, idx, reserved),
> +			nr_pages);
> +}
> +
> +void hugetlb_cgroup_uncharge_counter(struct page_counter *p,
> +				     unsigned long nr_pages)
> +{
> +	if (hugetlb_cgroup_disabled() || !p)
> +		return;
> +
> +	page_counter_uncharge(p, nr_pages);
>   }
> 
>   static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
> @@ -326,7 +377,8 @@ static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
>   		/* Fall through. */
>   	case HUGETLB_RES_LIMIT:
>   		mutex_lock(&hugetlb_limit_mutex);
> -		ret = page_counter_set_max(hugetlb_cgroup_get_counter(h_cg, idx, reserved),
> +		ret = page_counter_set_max(hugetlb_cgroup_get_counter(h_cg, idx,
> +								      reserved),
>   					   nr_pages);
>   		mutex_unlock(&hugetlb_limit_mutex);
>   		break;
> --
> 2.23.0.162.g0b9fbb3734-goog
> 

thanks,
-- Shuah

Patch
diff mbox series

diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
index 063962f6dfc6a..c467715dd8fb8 100644
--- a/include/linux/hugetlb_cgroup.h
+++ b/include/linux/hugetlb_cgroup.h
@@ -52,14 +52,19 @@  static inline bool hugetlb_cgroup_disabled(void)
 }

 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
-					struct hugetlb_cgroup **ptr);
+					struct hugetlb_cgroup **ptr,
+					bool reserved);
 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 					 struct hugetlb_cgroup *h_cg,
 					 struct page *page);
 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 					 struct page *page);
 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
-					   struct hugetlb_cgroup *h_cg);
+					   struct hugetlb_cgroup *h_cg,
+					   bool reserved);
+extern void hugetlb_cgroup_uncharge_counter(struct page_counter *p,
+					    unsigned long nr_pages);
+
 extern void hugetlb_cgroup_file_init(void) __init;
 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
 				   struct page *newhpage);
@@ -83,7 +88,7 @@  static inline bool hugetlb_cgroup_disabled(void)

 static inline int
 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
-			     struct hugetlb_cgroup **ptr)
+			     struct hugetlb_cgroup **ptr, bool reserved)
 {
 	return 0;
 }
@@ -102,7 +107,7 @@  hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)

 static inline void
 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
-			       struct hugetlb_cgroup *h_cg)
+			       struct hugetlb_cgroup *h_cg, bool reserved)
 {
 }

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6d7296dd11b83..e975f55aede94 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2078,7 +2078,8 @@  struct page *alloc_huge_page(struct vm_area_struct *vma,
 			gbl_chg = 1;
 	}

-	ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg);
+	ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg,
+					   false);
 	if (ret)
 		goto out_subpool_put;

@@ -2126,7 +2127,8 @@  struct page *alloc_huge_page(struct vm_area_struct *vma,
 	return page;

 out_uncharge_cgroup:
-	hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg);
+	hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg,
+			false);
 out_subpool_put:
 	if (map_chg || avoid_reserve)
 		hugepage_subpool_put_pages(spool, 1);
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 51a72624bd1ff..2ab36a98d834e 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -38,8 +38,8 @@  struct hugetlb_cgroup {
 static struct hugetlb_cgroup *root_h_cgroup __read_mostly;

 static inline
-struct page_counter *hugetlb_cgroup_get_counter(struct hugetlb_cgroup *h_cg, int idx,
-				 bool reserved)
+struct page_counter *hugetlb_cgroup_get_counter(struct hugetlb_cgroup *h_cg,
+						int idx, bool reserved)
 {
 	if (reserved)
 		return  &h_cg->reserved_hugepage[idx];
@@ -74,8 +74,12 @@  static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
 	int idx;

 	for (idx = 0; idx < hugetlb_max_hstate; idx++) {
-		if (page_counter_read(&h_cg->hugepage[idx]))
+		if (page_counter_read(hugetlb_cgroup_get_counter(h_cg, idx,
+						true)) ||
+		    page_counter_read(hugetlb_cgroup_get_counter(h_cg, idx,
+				    false))) {
 			return true;
+		}
 	}
 	return false;
 }
@@ -86,18 +90,30 @@  static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
 	int idx;

 	for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) {
-		struct page_counter *counter = &h_cgroup->hugepage[idx];
 		struct page_counter *parent = NULL;
+		struct page_counter *reserved_parent = NULL;
 		unsigned long limit;
 		int ret;

-		if (parent_h_cgroup)
-			parent = &parent_h_cgroup->hugepage[idx];
-		page_counter_init(counter, parent);
+		if (parent_h_cgroup) {
+			parent = hugetlb_cgroup_get_counter(
+					parent_h_cgroup, idx, false);
+			reserved_parent = hugetlb_cgroup_get_counter(
+					parent_h_cgroup, idx, true);
+		}
+		page_counter_init(hugetlb_cgroup_get_counter(
+					h_cgroup, idx, false), parent);
+		page_counter_init(hugetlb_cgroup_get_counter(
+					h_cgroup, idx, true),
+				  reserved_parent);

 		limit = round_down(PAGE_COUNTER_MAX,
 				   1 << huge_page_order(&hstates[idx]));
-		ret = page_counter_set_max(counter, limit);
+
+		ret = page_counter_set_max(hugetlb_cgroup_get_counter(
+					h_cgroup, idx, false), limit);
+		ret = page_counter_set_max(hugetlb_cgroup_get_counter(
+					h_cgroup, idx, true), limit);
 		VM_BUG_ON(ret);
 	}
 }
@@ -127,6 +143,26 @@  static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
 	kfree(h_cgroup);
 }

+static void hugetlb_cgroup_move_parent_reservation(int idx,
+						   struct hugetlb_cgroup *h_cg)
+{
+	struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg);
+
+	/* Move the reservation counters. */
+	if (!parent_hugetlb_cgroup(h_cg)) {
+		parent = root_h_cgroup;
+		/* root has no limit */
+		page_counter_charge(
+				&root_h_cgroup->reserved_hugepage[idx],
+				page_counter_read(hugetlb_cgroup_get_counter(
+						h_cg, idx, true)));
+	}
+
+	/* Take the pages off the local counter */
+	page_counter_cancel(hugetlb_cgroup_get_counter(h_cg, idx, true),
+			    page_counter_read(hugetlb_cgroup_get_counter(h_cg,
+					    idx, true)));
+}

 /*
  * Should be called with hugetlb_lock held.
@@ -181,6 +217,7 @@  static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
 	do {
 		for_each_hstate(h) {
 			spin_lock(&hugetlb_lock);
+			hugetlb_cgroup_move_parent_reservation(idx, h_cg);
 			list_for_each_entry(page, &h->hugepage_activelist, lru)
 				hugetlb_cgroup_move_parent(idx, h_cg, page);

@@ -192,7 +229,7 @@  static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
 }

 int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
-				 struct hugetlb_cgroup **ptr)
+				 struct hugetlb_cgroup **ptr, bool reserved)
 {
 	int ret = 0;
 	struct page_counter *counter;
@@ -215,8 +252,11 @@  int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 	}
 	rcu_read_unlock();

-	if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter))
+	if (!page_counter_try_charge(hugetlb_cgroup_get_counter(h_cg, idx,
+								reserved),
+				     nr_pages, &counter)) {
 		ret = -ENOMEM;
+	}
 	css_put(&h_cg->css);
 done:
 	*ptr = h_cg;
@@ -250,12 +290,14 @@  void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 	if (unlikely(!h_cg))
 		return;
 	set_hugetlb_cgroup(page, NULL);
-	page_counter_uncharge(&h_cg->hugepage[idx], nr_pages);
+	page_counter_uncharge(hugetlb_cgroup_get_counter(h_cg, idx, false),
+			nr_pages);
+
 	return;
 }

 void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
-				    struct hugetlb_cgroup *h_cg)
+				    struct hugetlb_cgroup *h_cg, bool reserved)
 {
 	if (hugetlb_cgroup_disabled() || !h_cg)
 		return;
@@ -263,8 +305,17 @@  void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 	if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
 		return;

-	page_counter_uncharge(&h_cg->hugepage[idx], nr_pages);
-	return;
+	page_counter_uncharge(hugetlb_cgroup_get_counter(h_cg, idx, reserved),
+			nr_pages);
+}
+
+void hugetlb_cgroup_uncharge_counter(struct page_counter *p,
+				     unsigned long nr_pages)
+{
+	if (hugetlb_cgroup_disabled() || !p)
+		return;
+
+	page_counter_uncharge(p, nr_pages);
 }

 static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
@@ -326,7 +377,8 @@  static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
 		/* Fall through. */
 	case HUGETLB_RES_LIMIT:
 		mutex_lock(&hugetlb_limit_mutex);
-		ret = page_counter_set_max(hugetlb_cgroup_get_counter(h_cg, idx, reserved),
+		ret = page_counter_set_max(hugetlb_cgroup_get_counter(h_cg, idx,
+								      reserved),
 					   nr_pages);
 		mutex_unlock(&hugetlb_limit_mutex);
 		break;