Augments 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.
---
include/linux/hugetlb_cgroup.h | 8 +++--
mm/hugetlb.c | 3 +-
mm/hugetlb_cgroup.c | 63 ++++++++++++++++++++++++++++------
3 files changed, 61 insertions(+), 13 deletions(-)
diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
index 063962f6dfc6a..0725f809cd2d9 100644
--- a/include/linux/hugetlb_cgroup.h
+++ b/include/linux/hugetlb_cgroup.h
@@ -52,7 +52,8 @@ 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);
@@ -60,6 +61,9 @@ 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);
+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 +87,7 @@ 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;
}
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ede7e7f5d1ab2..c153bef42e729 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;
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 708103663988a..119176a0b2ec5 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -74,8 +74,10 @@ 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(get_counter(h_cg, idx, true)) ||
+ page_counter_read(get_counter(h_cg, idx, false))) {
return true;
+ }
}
return false;
}
@@ -86,18 +88,27 @@ 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 = get_counter(parent_h_cgroup, idx, false);
+ reserved_parent = get_counter(parent_h_cgroup, idx,
+ true);
+ }
+ page_counter_init(get_counter(h_cgroup, idx, false), parent);
+ page_counter_init(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(get_counter(
+ h_cgroup, idx, false), limit);
+ ret = page_counter_set_max(get_counter(
+ h_cgroup, idx, true), limit);
VM_BUG_ON(ret);
}
}
@@ -127,6 +138,25 @@ 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(get_counter(h_cg, idx,
+ true)));
+ }
+
+ /* Take the pages off the local counter */
+ page_counter_cancel(get_counter(h_cg, idx, true),
+ page_counter_read(get_counter(h_cg, idx, true)));
+}
/*
* Should be called with hugetlb_lock held.
@@ -181,6 +211,7 @@ 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 +223,7 @@ 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 +246,10 @@ 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(get_counter(h_cg, idx, reserved),
+ nr_pages, &counter)) {
ret = -ENOMEM;
+ }
css_put(&h_cg->css);
done:
*ptr = h_cg;
@@ -250,7 +283,8 @@ 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(get_counter(h_cg, idx, false), nr_pages);
+
return;
}
@@ -263,7 +297,16 @@ 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);
+ page_counter_uncharge(get_counter(h_cg, idx, false), 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);
return;
}
--
2.23.0.rc1.153.gdeed80330f-goog
