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Message-Id: <20190826233240.11524-3-almasrymina@google.com>
Date: Mon, 26 Aug 2019 16:32:36 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: mike.kravetz@...cle.com
Cc: shuah@...nel.org, almasrymina@...gle.com, rientjes@...gle.com,
shakeelb@...gle.com, gthelen@...gle.com, akpm@...ux-foundation.org,
khalid.aziz@...cle.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
cgroups@...r.kernel.org, aneesh.kumar@...ux.vnet.ibm.com,
mkoutny@...e.com
Subject: [PATCH v3 2/6] hugetlb_cgroup: add interface for charge/uncharge
hugetlb reservations
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.
---
include/linux/hugetlb_cgroup.h | 8 +++-
mm/hugetlb.c | 3 +-
mm/hugetlb_cgroup.c | 80 ++++++++++++++++++++++++++++------
3 files changed, 74 insertions(+), 17 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 6d7296dd11b83..242cfeb7cc3e1 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 51a72624bd1ff..bd9b58474be51 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;
@@ -250,7 +290,9 @@ 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;
}
@@ -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, 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);
}
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;
--
2.23.0.187.g17f5b7556c-goog
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