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hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations

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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.

Signed-off-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/20200211213128.73302-2-almasrymina@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mina Almasry 2020-04-01 21:11:15 -07:00 committed by Linus Torvalds
parent cdc2fcfea7
commit 1adc4d419a
3 changed files with 251 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

111
include/linux/hugetlb_cgroup.h
View File

@ -20,32 +20,64 @@
struct hugetlb_cgroup;
/*
* Minimum page order trackable by hugetlb cgroup.
* At least 3 pages are necessary for all the tracking information.
* At least 4 pages are necessary for all the tracking information.
* The second tail page (hpage[2]) is the fault usage cgroup.
* The third tail page (hpage[3]) is the reservation usage cgroup.
*/
#define HUGETLB_CGROUP_MIN_ORDER 2
#ifdef CONFIG_CGROUP_HUGETLB
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
static inline struct hugetlb_cgroup *
__hugetlb_cgroup_from_page(struct page *page, bool rsvd)
{
VM_BUG_ON_PAGE(!PageHuge(page), page);
if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
return NULL;
if (rsvd)
return (struct hugetlb_cgroup *)page[3].private;
else
return (struct hugetlb_cgroup *)page[2].private;
}
static inline
int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
return __hugetlb_cgroup_from_page(page, false);
}
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_page_rsvd(struct page *page)
{
return __hugetlb_cgroup_from_page(page, true);
}
static inline int __set_hugetlb_cgroup(struct page *page,
struct hugetlb_cgroup *h_cg, bool rsvd)
{
VM_BUG_ON_PAGE(!PageHuge(page), page);
if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
return -1;
if (rsvd)
page[3].private = (unsigned long)h_cg;
else
page[2].private = (unsigned long)h_cg;
return 0;
}
static inline int set_hugetlb_cgroup(struct page *page,
struct hugetlb_cgroup *h_cg)
{
return __set_hugetlb_cgroup(page, h_cg, false);
}
static inline int set_hugetlb_cgroup_rsvd(struct page *page,
struct hugetlb_cgroup *h_cg)
{
return __set_hugetlb_cgroup(page, h_cg, true);
}
static inline bool hugetlb_cgroup_disabled(void)
{
return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
@ -53,13 +85,27 @@ static inline bool hugetlb_cgroup_disabled(void)
extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr);
extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr);
extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page);
extern void hugetlb_cgroup_commit_charge_rsvd(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_page_rsvd(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_cgroup_rsvd(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,
struct cgroup_subsys_state *css);
extern void hugetlb_cgroup_file_init(void) __init;
extern void hugetlb_cgroup_migrate(struct page *oldhpage,
struct page *newhpage);
@ -70,8 +116,26 @@ static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
return NULL;
}
static inline
int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_page_resv(struct page *page)
{
return NULL;
}
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_page_rsvd(struct page *page)
{
return NULL;
}
static inline int set_hugetlb_cgroup(struct page *page,
struct hugetlb_cgroup *h_cg)
{
return 0;
}
static inline int set_hugetlb_cgroup_rsvd(struct page *page,
struct hugetlb_cgroup *h_cg)
{
return 0;
}
@ -81,27 +145,50 @@ static inline bool hugetlb_cgroup_disabled(void)
return true;
}
static inline int
hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
{
return 0;
}
static inline void
hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
{
return 0;
}
static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
{
}
static inline void
hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
{
}
static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page)
{
}
static inline void hugetlb_cgroup_uncharge_page_rsvd(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)
{
}
static inline void
hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
}

2
mm/hugetlb.c
View File

@ -1072,6 +1072,7 @@ static void update_and_free_page(struct hstate *h, struct page *page)
1 << PG_writeback);
}
VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page);
VM_BUG_ON_PAGE(hugetlb_cgroup_from_page_rsvd(page), page);
set_compound_page_dtor(page, NULL_COMPOUND_DTOR);
set_page_refcounted(page);
if (hstate_is_gigantic(h)) {
@ -1257,6 +1258,7 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
spin_lock(&hugetlb_lock);
set_hugetlb_cgroup(page, NULL);
set_hugetlb_cgroup_rsvd(page, NULL);
h->nr_huge_pages++;
h->nr_huge_pages_node[nid]++;
spin_unlock(&hugetlb_lock);

166
mm/hugetlb_cgroup.c
View File

@ -61,7 +61,7 @@ struct hugetlb_cgroup {
static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
static inline struct page_counter *
hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx,
__hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx,
bool rsvd)
{
if (rsvd)
@ -69,6 +69,18 @@ hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx,
return &h_cg->hugepage[idx];
}
static inline struct page_counter *
hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx)
{
return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, false);
}
static inline struct page_counter *
hugetlb_cgroup_counter_from_cgroup_rsvd(struct hugetlb_cgroup *h_cg, int idx)
{
return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, true);
}
static inline
struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
{
@ -97,9 +109,13 @@ 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_counter_from_cgroup(h_cg, idx)) ||
page_counter_read(hugetlb_cgroup_counter_from_cgroup_rsvd(
h_cg, idx))) {
return true;
}
}
return false;
}
@ -109,18 +125,34 @@ 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 *fault_parent = NULL;
struct page_counter *rsvd_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) {
fault_parent = hugetlb_cgroup_counter_from_cgroup(
parent_h_cgroup, idx);
rsvd_parent = hugetlb_cgroup_counter_from_cgroup_rsvd(
parent_h_cgroup, idx);
}
page_counter_init(hugetlb_cgroup_counter_from_cgroup(h_cgroup,
idx),
fault_parent);
page_counter_init(
hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx),
rsvd_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_counter_from_cgroup(h_cgroup, idx),
limit);
VM_BUG_ON(ret);
ret = page_counter_set_max(
hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx),
limit);
VM_BUG_ON(ret);
}
}
@ -150,7 +182,6 @@ static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
kfree(h_cgroup);
}
/*
* Should be called with hugetlb_lock held.
* Since we are holding hugetlb_lock, pages cannot get moved from
@ -227,8 +258,9 @@ static inline void hugetlb_event(struct hugetlb_cgroup *hugetlb, int idx,
!hugetlb_cgroup_is_root(hugetlb));
}
int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
static int __hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr,
bool rsvd)
{
int ret = 0;
struct page_counter *counter;
@ -251,50 +283,103 @@ again:
}
rcu_read_unlock();
if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages,
&counter)) {
if (!page_counter_try_charge(
__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd),
nr_pages, &counter)) {
ret = -ENOMEM;
hugetlb_event(h_cg, idx, HUGETLB_MAX);
css_put(&h_cg->css);
goto done;
}
/* Reservations take a reference to the css because they do not get
* reparented.
*/
if (!rsvd)
css_put(&h_cg->css);
done:
*ptr = h_cg;
return ret;
}
int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
{
return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, false);
}
int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
{
return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, true);
}
/* Should be called with hugetlb_lock held */
void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
struct page *page, bool rsvd)
{
if (hugetlb_cgroup_disabled() || !h_cg)
return;
set_hugetlb_cgroup(page, h_cg);
__set_hugetlb_cgroup(page, h_cg, rsvd);
return;
}
void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
{
__hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, false);
}
void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
{
__hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, true);
}
/*
* Should be called with hugetlb_lock held
*/
void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page)
static void __hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page, bool rsvd)
{
struct hugetlb_cgroup *h_cg;
if (hugetlb_cgroup_disabled())
return;
lockdep_assert_held(&hugetlb_lock);
h_cg = hugetlb_cgroup_from_page(page);
h_cg = __hugetlb_cgroup_from_page(page, rsvd);
if (unlikely(!h_cg))
return;
set_hugetlb_cgroup(page, NULL);
page_counter_uncharge(&h_cg->hugepage[idx], nr_pages);
__set_hugetlb_cgroup(page, NULL, rsvd);
page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx,
rsvd),
nr_pages);
if (rsvd)
css_put(&h_cg->css);
return;
}
void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page)
{
__hugetlb_cgroup_uncharge_page(idx, nr_pages, page, false);
}
void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
struct page *page)
{
__hugetlb_cgroup_uncharge_page(idx, nr_pages, page, true);
}
static void __hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
bool rsvd)
{
if (hugetlb_cgroup_disabled() || !h_cg)
return;
@ -302,8 +387,35 @@ 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(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx,
rsvd),
nr_pages);
if (rsvd)
css_put(&h_cg->css);
}
void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
__hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, false);
}
void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
__hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, true);
}
void hugetlb_cgroup_uncharge_counter(struct page_counter *p,
unsigned long nr_pages,
struct cgroup_subsys_state *css)
{
if (hugetlb_cgroup_disabled() || !p || !css)
return;
page_counter_uncharge(p, nr_pages);
css_put(css);
}
enum {
@ -418,7 +530,7 @@ static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
case RES_LIMIT:
mutex_lock(&hugetlb_limit_mutex);
ret = page_counter_set_max(
hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd),
__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd),
nr_pages);
mutex_unlock(&hugetlb_limit_mutex);
break;
@ -674,6 +786,7 @@ void __init hugetlb_cgroup_file_init(void)
void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
{
struct hugetlb_cgroup *h_cg;
struct hugetlb_cgroup *h_cg_rsvd;
struct hstate *h = page_hstate(oldhpage);
if (hugetlb_cgroup_disabled())
@ -682,10 +795,11 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage);
spin_lock(&hugetlb_lock);
h_cg = hugetlb_cgroup_from_page(oldhpage);
h_cg_rsvd = hugetlb_cgroup_from_page_rsvd(oldhpage);
set_hugetlb_cgroup(oldhpage, NULL);
/* move the h_cg details to new cgroup */
set_hugetlb_cgroup(newhpage, h_cg);
set_hugetlb_cgroup_rsvd(newhpage, h_cg_rsvd);
list_move(&newhpage->lru, &h->hugepage_activelist);
spin_unlock(&hugetlb_lock);
return;