linux/mm/hugetlb_cgroup.c
Roman Gushchin f77bd4b14c mm: memcg: don't call propagate_protected_usage() needlessly
Patch series "mm: memcg: page counters optimizations", v3.

This patchset contains 3 independent small optimizations of page counters.


This patch (of 3):

Memory protection (min/low) requires a constant tracking of protected
memory usage.  propagate_protected_usage() is called on each page counters
update and does a number of operations even in cases when the actual
memory protection functionality is not supported (e.g.  hugetlb cgroups or
memcg swap counters).

It's obviously inefficient and leads to a waste of CPU cycles.  It can be
addressed by calling propagate_protected_usage() only for the counters
which do support memory guarantees.  As of now it's only memcg->memory -
the unified memory memcg counter.

Link: https://lkml.kernel.org/r/20240726203110.1577216-2-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-09-01 20:25:50 -07:00

934 lines
24 KiB
C

/*
*
* Copyright IBM Corporation, 2012
* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* Cgroup v2
* Copyright (C) 2019 Red Hat, Inc.
* Author: Giuseppe Scrivano <gscrivan@redhat.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#include <linux/cgroup.h>
#include <linux/page_counter.h>
#include <linux/slab.h>
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
#define MEMFILE_IDX(val) (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
/* Use t->m[0] to encode the offset */
#define MEMFILE_OFFSET(t, m0) (((offsetof(t, m0) << 16) | sizeof_field(t, m0)))
#define MEMFILE_OFFSET0(val) (((val) >> 16) & 0xffff)
#define MEMFILE_FIELD_SIZE(val) ((val) & 0xffff)
#define DFL_TMPL_SIZE ARRAY_SIZE(hugetlb_dfl_tmpl)
#define LEGACY_TMPL_SIZE ARRAY_SIZE(hugetlb_legacy_tmpl)
static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
static struct cftype *dfl_files;
static struct cftype *legacy_files;
static inline struct page_counter *
__hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx,
bool rsvd)
{
if (rsvd)
return &h_cg->rsvd_hugepage[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)
{
return s ? container_of(s, struct hugetlb_cgroup, css) : NULL;
}
static inline
struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task)
{
return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id));
}
static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg)
{
return (h_cg == root_h_cgroup);
}
static inline struct hugetlb_cgroup *
parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg)
{
return hugetlb_cgroup_from_css(h_cg->css.parent);
}
static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
{
struct hstate *h;
for_each_hstate(h) {
if (page_counter_read(
hugetlb_cgroup_counter_from_cgroup(h_cg, hstate_index(h))))
return true;
}
return false;
}
static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
struct hugetlb_cgroup *parent_h_cgroup)
{
int idx;
for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) {
struct page_counter *fault_parent = NULL;
struct page_counter *rsvd_parent = NULL;
unsigned long limit;
int ret;
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, false);
page_counter_init(
hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx),
rsvd_parent, false);
limit = round_down(PAGE_COUNTER_MAX,
pages_per_huge_page(&hstates[idx]));
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);
}
}
static void hugetlb_cgroup_free(struct hugetlb_cgroup *h_cgroup)
{
int node;
for_each_node(node)
kfree(h_cgroup->nodeinfo[node]);
kfree(h_cgroup);
}
static struct cgroup_subsys_state *
hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
{
struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css);
struct hugetlb_cgroup *h_cgroup;
int node;
h_cgroup = kzalloc(struct_size(h_cgroup, nodeinfo, nr_node_ids),
GFP_KERNEL);
if (!h_cgroup)
return ERR_PTR(-ENOMEM);
if (!parent_h_cgroup)
root_h_cgroup = h_cgroup;
/*
* TODO: this routine can waste much memory for nodes which will
* never be onlined. It's better to use memory hotplug callback
* function.
*/
for_each_node(node) {
/* Set node_to_alloc to NUMA_NO_NODE for offline nodes. */
int node_to_alloc =
node_state(node, N_NORMAL_MEMORY) ? node : NUMA_NO_NODE;
h_cgroup->nodeinfo[node] =
kzalloc_node(sizeof(struct hugetlb_cgroup_per_node),
GFP_KERNEL, node_to_alloc);
if (!h_cgroup->nodeinfo[node])
goto fail_alloc_nodeinfo;
}
hugetlb_cgroup_init(h_cgroup, parent_h_cgroup);
return &h_cgroup->css;
fail_alloc_nodeinfo:
hugetlb_cgroup_free(h_cgroup);
return ERR_PTR(-ENOMEM);
}
static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
{
hugetlb_cgroup_free(hugetlb_cgroup_from_css(css));
}
/*
* Should be called with hugetlb_lock held.
* Since we are holding hugetlb_lock, pages cannot get moved from
* active list or uncharged from the cgroup, So no need to get
* page reference and test for page active here. This function
* cannot fail.
*/
static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg,
struct page *page)
{
unsigned int nr_pages;
struct page_counter *counter;
struct hugetlb_cgroup *page_hcg;
struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg);
struct folio *folio = page_folio(page);
page_hcg = hugetlb_cgroup_from_folio(folio);
/*
* We can have pages in active list without any cgroup
* ie, hugepage with less than 3 pages. We can safely
* ignore those pages.
*/
if (!page_hcg || page_hcg != h_cg)
goto out;
nr_pages = compound_nr(page);
if (!parent) {
parent = root_h_cgroup;
/* root has no limit */
page_counter_charge(&parent->hugepage[idx], nr_pages);
}
counter = &h_cg->hugepage[idx];
/* Take the pages off the local counter */
page_counter_cancel(counter, nr_pages);
set_hugetlb_cgroup(folio, parent);
out:
return;
}
/*
* Force the hugetlb cgroup to empty the hugetlb resources by moving them to
* the parent cgroup.
*/
static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
{
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
struct hstate *h;
struct page *page;
do {
for_each_hstate(h) {
spin_lock_irq(&hugetlb_lock);
list_for_each_entry(page, &h->hugepage_activelist, lru)
hugetlb_cgroup_move_parent(hstate_index(h), h_cg, page);
spin_unlock_irq(&hugetlb_lock);
}
cond_resched();
} while (hugetlb_cgroup_have_usage(h_cg));
}
static inline void hugetlb_event(struct hugetlb_cgroup *hugetlb, int idx,
enum hugetlb_memory_event event)
{
atomic_long_inc(&hugetlb->events_local[idx][event]);
cgroup_file_notify(&hugetlb->events_local_file[idx]);
do {
atomic_long_inc(&hugetlb->events[idx][event]);
cgroup_file_notify(&hugetlb->events_file[idx]);
} while ((hugetlb = parent_hugetlb_cgroup(hugetlb)) &&
!hugetlb_cgroup_is_root(hugetlb));
}
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;
struct hugetlb_cgroup *h_cg = NULL;
if (hugetlb_cgroup_disabled())
goto done;
again:
rcu_read_lock();
h_cg = hugetlb_cgroup_from_task(current);
if (!css_tryget(&h_cg->css)) {
rcu_read_unlock();
goto again;
}
rcu_read_unlock();
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 */
static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct folio *folio, bool rsvd)
{
if (hugetlb_cgroup_disabled() || !h_cg)
return;
lockdep_assert_held(&hugetlb_lock);
__set_hugetlb_cgroup(folio, h_cg, rsvd);
if (!rsvd) {
unsigned long usage =
h_cg->nodeinfo[folio_nid(folio)]->usage[idx];
/*
* This write is not atomic due to fetching usage and writing
* to it, but that's fine because we call this with
* hugetlb_lock held anyway.
*/
WRITE_ONCE(h_cg->nodeinfo[folio_nid(folio)]->usage[idx],
usage + nr_pages);
}
}
void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct folio *folio)
{
__hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, folio, false);
}
void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct folio *folio)
{
__hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, folio, true);
}
/*
* Should be called with hugetlb_lock held
*/
static void __hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages,
struct folio *folio, bool rsvd)
{
struct hugetlb_cgroup *h_cg;
if (hugetlb_cgroup_disabled())
return;
lockdep_assert_held(&hugetlb_lock);
h_cg = __hugetlb_cgroup_from_folio(folio, rsvd);
if (unlikely(!h_cg))
return;
__set_hugetlb_cgroup(folio, NULL, rsvd);
page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx,
rsvd),
nr_pages);
if (rsvd)
css_put(&h_cg->css);
else {
unsigned long usage =
h_cg->nodeinfo[folio_nid(folio)]->usage[idx];
/*
* This write is not atomic due to fetching usage and writing
* to it, but that's fine because we call this with
* hugetlb_lock held anyway.
*/
WRITE_ONCE(h_cg->nodeinfo[folio_nid(folio)]->usage[idx],
usage - nr_pages);
}
}
void hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages,
struct folio *folio)
{
__hugetlb_cgroup_uncharge_folio(idx, nr_pages, folio, false);
}
void hugetlb_cgroup_uncharge_folio_rsvd(int idx, unsigned long nr_pages,
struct folio *folio)
{
__hugetlb_cgroup_uncharge_folio(idx, nr_pages, folio, 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;
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 resv_map *resv, unsigned long start,
unsigned long end)
{
if (hugetlb_cgroup_disabled() || !resv || !resv->reservation_counter ||
!resv->css)
return;
page_counter_uncharge(resv->reservation_counter,
(end - start) * resv->pages_per_hpage);
css_put(resv->css);
}
void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
struct file_region *rg,
unsigned long nr_pages,
bool region_del)
{
if (hugetlb_cgroup_disabled() || !resv || !rg || !nr_pages)
return;
if (rg->reservation_counter && resv->pages_per_hpage &&
!resv->reservation_counter) {
page_counter_uncharge(rg->reservation_counter,
nr_pages * resv->pages_per_hpage);
/*
* Only do css_put(rg->css) when we delete the entire region
* because one file_region must hold exactly one css reference.
*/
if (region_del)
css_put(rg->css);
}
}
enum {
RES_USAGE,
RES_RSVD_USAGE,
RES_LIMIT,
RES_RSVD_LIMIT,
RES_MAX_USAGE,
RES_RSVD_MAX_USAGE,
RES_FAILCNT,
RES_RSVD_FAILCNT,
};
static int hugetlb_cgroup_read_numa_stat(struct seq_file *seq, void *dummy)
{
int nid;
struct cftype *cft = seq_cft(seq);
int idx = MEMFILE_IDX(cft->private);
bool legacy = !cgroup_subsys_on_dfl(hugetlb_cgrp_subsys);
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
struct cgroup_subsys_state *css;
unsigned long usage;
if (legacy) {
/* Add up usage across all nodes for the non-hierarchical total. */
usage = 0;
for_each_node_state(nid, N_MEMORY)
usage += READ_ONCE(h_cg->nodeinfo[nid]->usage[idx]);
seq_printf(seq, "total=%lu", usage * PAGE_SIZE);
/* Simply print the per-node usage for the non-hierarchical total. */
for_each_node_state(nid, N_MEMORY)
seq_printf(seq, " N%d=%lu", nid,
READ_ONCE(h_cg->nodeinfo[nid]->usage[idx]) *
PAGE_SIZE);
seq_putc(seq, '\n');
}
/*
* The hierarchical total is pretty much the value recorded by the
* counter, so use that.
*/
seq_printf(seq, "%stotal=%lu", legacy ? "hierarchical_" : "",
page_counter_read(&h_cg->hugepage[idx]) * PAGE_SIZE);
/*
* For each node, transverse the css tree to obtain the hierarchical
* node usage.
*/
for_each_node_state(nid, N_MEMORY) {
usage = 0;
rcu_read_lock();
css_for_each_descendant_pre(css, &h_cg->css) {
usage += READ_ONCE(hugetlb_cgroup_from_css(css)
->nodeinfo[nid]
->usage[idx]);
}
rcu_read_unlock();
seq_printf(seq, " N%d=%lu", nid, usage * PAGE_SIZE);
}
seq_putc(seq, '\n');
return 0;
}
static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
struct cftype *cft)
{
struct page_counter *counter;
struct page_counter *rsvd_counter;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)];
rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(cft->private)];
switch (MEMFILE_ATTR(cft->private)) {
case RES_USAGE:
return (u64)page_counter_read(counter) * PAGE_SIZE;
case RES_RSVD_USAGE:
return (u64)page_counter_read(rsvd_counter) * PAGE_SIZE;
case RES_LIMIT:
return (u64)counter->max * PAGE_SIZE;
case RES_RSVD_LIMIT:
return (u64)rsvd_counter->max * PAGE_SIZE;
case RES_MAX_USAGE:
return (u64)counter->watermark * PAGE_SIZE;
case RES_RSVD_MAX_USAGE:
return (u64)rsvd_counter->watermark * PAGE_SIZE;
case RES_FAILCNT:
return counter->failcnt;
case RES_RSVD_FAILCNT:
return rsvd_counter->failcnt;
default:
BUG();
}
}
static int hugetlb_cgroup_read_u64_max(struct seq_file *seq, void *v)
{
int idx;
u64 val;
struct cftype *cft = seq_cft(seq);
unsigned long limit;
struct page_counter *counter;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
idx = MEMFILE_IDX(cft->private);
counter = &h_cg->hugepage[idx];
limit = round_down(PAGE_COUNTER_MAX,
pages_per_huge_page(&hstates[idx]));
switch (MEMFILE_ATTR(cft->private)) {
case RES_RSVD_USAGE:
counter = &h_cg->rsvd_hugepage[idx];
fallthrough;
case RES_USAGE:
val = (u64)page_counter_read(counter);
seq_printf(seq, "%llu\n", val * PAGE_SIZE);
break;
case RES_RSVD_LIMIT:
counter = &h_cg->rsvd_hugepage[idx];
fallthrough;
case RES_LIMIT:
val = (u64)counter->max;
if (val == limit)
seq_puts(seq, "max\n");
else
seq_printf(seq, "%llu\n", val * PAGE_SIZE);
break;
default:
BUG();
}
return 0;
}
static DEFINE_MUTEX(hugetlb_limit_mutex);
static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off,
const char *max)
{
int ret, idx;
unsigned long nr_pages;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
bool rsvd = false;
if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */
return -EINVAL;
buf = strstrip(buf);
ret = page_counter_memparse(buf, max, &nr_pages);
if (ret)
return ret;
idx = MEMFILE_IDX(of_cft(of)->private);
nr_pages = round_down(nr_pages, pages_per_huge_page(&hstates[idx]));
switch (MEMFILE_ATTR(of_cft(of)->private)) {
case RES_RSVD_LIMIT:
rsvd = true;
fallthrough;
case RES_LIMIT:
mutex_lock(&hugetlb_limit_mutex);
ret = page_counter_set_max(
__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd),
nr_pages);
mutex_unlock(&hugetlb_limit_mutex);
break;
default:
ret = -EINVAL;
break;
}
return ret ?: nbytes;
}
static ssize_t hugetlb_cgroup_write_legacy(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
return hugetlb_cgroup_write(of, buf, nbytes, off, "-1");
}
static ssize_t hugetlb_cgroup_write_dfl(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
return hugetlb_cgroup_write(of, buf, nbytes, off, "max");
}
static ssize_t hugetlb_cgroup_reset(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
int ret = 0;
struct page_counter *counter, *rsvd_counter;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)];
rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(of_cft(of)->private)];
switch (MEMFILE_ATTR(of_cft(of)->private)) {
case RES_MAX_USAGE:
page_counter_reset_watermark(counter);
break;
case RES_RSVD_MAX_USAGE:
page_counter_reset_watermark(rsvd_counter);
break;
case RES_FAILCNT:
counter->failcnt = 0;
break;
case RES_RSVD_FAILCNT:
rsvd_counter->failcnt = 0;
break;
default:
ret = -EINVAL;
break;
}
return ret ?: nbytes;
}
static char *mem_fmt(char *buf, int size, unsigned long hsize)
{
if (hsize >= SZ_1G)
snprintf(buf, size, "%luGB", hsize / SZ_1G);
else if (hsize >= SZ_1M)
snprintf(buf, size, "%luMB", hsize / SZ_1M);
else
snprintf(buf, size, "%luKB", hsize / SZ_1K);
return buf;
}
static int __hugetlb_events_show(struct seq_file *seq, bool local)
{
int idx;
long max;
struct cftype *cft = seq_cft(seq);
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
idx = MEMFILE_IDX(cft->private);
if (local)
max = atomic_long_read(&h_cg->events_local[idx][HUGETLB_MAX]);
else
max = atomic_long_read(&h_cg->events[idx][HUGETLB_MAX]);
seq_printf(seq, "max %lu\n", max);
return 0;
}
static int hugetlb_events_show(struct seq_file *seq, void *v)
{
return __hugetlb_events_show(seq, false);
}
static int hugetlb_events_local_show(struct seq_file *seq, void *v)
{
return __hugetlb_events_show(seq, true);
}
static struct cftype hugetlb_dfl_tmpl[] = {
{
.name = "max",
.private = RES_LIMIT,
.seq_show = hugetlb_cgroup_read_u64_max,
.write = hugetlb_cgroup_write_dfl,
.flags = CFTYPE_NOT_ON_ROOT,
},
{
.name = "rsvd.max",
.private = RES_RSVD_LIMIT,
.seq_show = hugetlb_cgroup_read_u64_max,
.write = hugetlb_cgroup_write_dfl,
.flags = CFTYPE_NOT_ON_ROOT,
},
{
.name = "current",
.private = RES_USAGE,
.seq_show = hugetlb_cgroup_read_u64_max,
.flags = CFTYPE_NOT_ON_ROOT,
},
{
.name = "rsvd.current",
.private = RES_RSVD_USAGE,
.seq_show = hugetlb_cgroup_read_u64_max,
.flags = CFTYPE_NOT_ON_ROOT,
},
{
.name = "events",
.seq_show = hugetlb_events_show,
.file_offset = MEMFILE_OFFSET(struct hugetlb_cgroup, events_file[0]),
.flags = CFTYPE_NOT_ON_ROOT,
},
{
.name = "events.local",
.seq_show = hugetlb_events_local_show,
.file_offset = MEMFILE_OFFSET(struct hugetlb_cgroup, events_local_file[0]),
.flags = CFTYPE_NOT_ON_ROOT,
},
{
.name = "numa_stat",
.seq_show = hugetlb_cgroup_read_numa_stat,
.flags = CFTYPE_NOT_ON_ROOT,
},
/* don't need terminator here */
};
static struct cftype hugetlb_legacy_tmpl[] = {
{
.name = "limit_in_bytes",
.private = RES_LIMIT,
.read_u64 = hugetlb_cgroup_read_u64,
.write = hugetlb_cgroup_write_legacy,
},
{
.name = "rsvd.limit_in_bytes",
.private = RES_RSVD_LIMIT,
.read_u64 = hugetlb_cgroup_read_u64,
.write = hugetlb_cgroup_write_legacy,
},
{
.name = "usage_in_bytes",
.private = RES_USAGE,
.read_u64 = hugetlb_cgroup_read_u64,
},
{
.name = "rsvd.usage_in_bytes",
.private = RES_RSVD_USAGE,
.read_u64 = hugetlb_cgroup_read_u64,
},
{
.name = "max_usage_in_bytes",
.private = RES_MAX_USAGE,
.write = hugetlb_cgroup_reset,
.read_u64 = hugetlb_cgroup_read_u64,
},
{
.name = "rsvd.max_usage_in_bytes",
.private = RES_RSVD_MAX_USAGE,
.write = hugetlb_cgroup_reset,
.read_u64 = hugetlb_cgroup_read_u64,
},
{
.name = "failcnt",
.private = RES_FAILCNT,
.write = hugetlb_cgroup_reset,
.read_u64 = hugetlb_cgroup_read_u64,
},
{
.name = "rsvd.failcnt",
.private = RES_RSVD_FAILCNT,
.write = hugetlb_cgroup_reset,
.read_u64 = hugetlb_cgroup_read_u64,
},
{
.name = "numa_stat",
.seq_show = hugetlb_cgroup_read_numa_stat,
},
/* don't need terminator here */
};
static void __init
hugetlb_cgroup_cfttypes_init(struct hstate *h, struct cftype *cft,
struct cftype *tmpl, int tmpl_size)
{
char buf[32];
int i, idx = hstate_index(h);
/* format the size */
mem_fmt(buf, sizeof(buf), huge_page_size(h));
for (i = 0; i < tmpl_size; cft++, tmpl++, i++) {
*cft = *tmpl;
/* rebuild the name */
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.%s", buf, tmpl->name);
/* rebuild the private */
cft->private = MEMFILE_PRIVATE(idx, tmpl->private);
/* rebuild the file_offset */
if (tmpl->file_offset) {
unsigned int offset = tmpl->file_offset;
cft->file_offset = MEMFILE_OFFSET0(offset) +
MEMFILE_FIELD_SIZE(offset) * idx;
}
lockdep_register_key(&cft->lockdep_key);
}
}
static void __init __hugetlb_cgroup_file_dfl_init(struct hstate *h)
{
int idx = hstate_index(h);
hugetlb_cgroup_cfttypes_init(h, dfl_files + idx * DFL_TMPL_SIZE,
hugetlb_dfl_tmpl, DFL_TMPL_SIZE);
}
static void __init __hugetlb_cgroup_file_legacy_init(struct hstate *h)
{
int idx = hstate_index(h);
hugetlb_cgroup_cfttypes_init(h, legacy_files + idx * LEGACY_TMPL_SIZE,
hugetlb_legacy_tmpl, LEGACY_TMPL_SIZE);
}
static void __init __hugetlb_cgroup_file_init(struct hstate *h)
{
__hugetlb_cgroup_file_dfl_init(h);
__hugetlb_cgroup_file_legacy_init(h);
}
static void __init __hugetlb_cgroup_file_pre_init(void)
{
int cft_count;
cft_count = hugetlb_max_hstate * DFL_TMPL_SIZE + 1; /* add terminator */
dfl_files = kcalloc(cft_count, sizeof(struct cftype), GFP_KERNEL);
BUG_ON(!dfl_files);
cft_count = hugetlb_max_hstate * LEGACY_TMPL_SIZE + 1; /* add terminator */
legacy_files = kcalloc(cft_count, sizeof(struct cftype), GFP_KERNEL);
BUG_ON(!legacy_files);
}
static void __init __hugetlb_cgroup_file_post_init(void)
{
WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys,
dfl_files));
WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
legacy_files));
}
void __init hugetlb_cgroup_file_init(void)
{
struct hstate *h;
__hugetlb_cgroup_file_pre_init();
for_each_hstate(h)
__hugetlb_cgroup_file_init(h);
__hugetlb_cgroup_file_post_init();
}
/*
* hugetlb_lock will make sure a parallel cgroup rmdir won't happen
* when we migrate hugepages
*/
void hugetlb_cgroup_migrate(struct folio *old_folio, struct folio *new_folio)
{
struct hugetlb_cgroup *h_cg;
struct hugetlb_cgroup *h_cg_rsvd;
struct hstate *h = folio_hstate(old_folio);
if (hugetlb_cgroup_disabled())
return;
spin_lock_irq(&hugetlb_lock);
h_cg = hugetlb_cgroup_from_folio(old_folio);
h_cg_rsvd = hugetlb_cgroup_from_folio_rsvd(old_folio);
set_hugetlb_cgroup(old_folio, NULL);
set_hugetlb_cgroup_rsvd(old_folio, NULL);
/* move the h_cg details to new cgroup */
set_hugetlb_cgroup(new_folio, h_cg);
set_hugetlb_cgroup_rsvd(new_folio, h_cg_rsvd);
list_move(&new_folio->lru, &h->hugepage_activelist);
spin_unlock_irq(&hugetlb_lock);
return;
}
static struct cftype hugetlb_files[] = {
{} /* terminate */
};
struct cgroup_subsys hugetlb_cgrp_subsys = {
.css_alloc = hugetlb_cgroup_css_alloc,
.css_offline = hugetlb_cgroup_css_offline,
.css_free = hugetlb_cgroup_css_free,
.dfl_cftypes = hugetlb_files,
.legacy_cftypes = hugetlb_files,
};