diff options
Diffstat (limited to 'mm/hugetlb_cgroup.c')
| -rw-r--r-- | mm/hugetlb_cgroup.c | 920 |
1 files changed, 920 insertions, 0 deletions
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c new file mode 100644 index 000000000..dedd2edb0 --- /dev/null +++ b/mm/hugetlb_cgroup.c @@ -0,0 +1,920 @@ +/* + * + * 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) + +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, + 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); + page_counter_init( + hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx), + rsvd_parent); + + 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; + /* + * We don't charge any cgroup if the compound page have less + * than 3 pages. + */ + if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) + 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; + + __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; + + if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) + 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 = MEMFILE_ATTR(cft->private); + 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 void __init __hugetlb_cgroup_file_dfl_init(int idx) +{ + char buf[32]; + struct cftype *cft; + struct hstate *h = &hstates[idx]; + + /* format the size */ + mem_fmt(buf, sizeof(buf), huge_page_size(h)); + + /* Add the limit file */ + cft = &h->cgroup_files_dfl[0]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); + cft->seq_show = hugetlb_cgroup_read_u64_max; + cft->write = hugetlb_cgroup_write_dfl; + cft->flags = CFTYPE_NOT_ON_ROOT; + + /* Add the reservation limit file */ + cft = &h->cgroup_files_dfl[1]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); + cft->seq_show = hugetlb_cgroup_read_u64_max; + cft->write = hugetlb_cgroup_write_dfl; + cft->flags = CFTYPE_NOT_ON_ROOT; + + /* Add the current usage file */ + cft = &h->cgroup_files_dfl[2]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.current", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); + cft->seq_show = hugetlb_cgroup_read_u64_max; + cft->flags = CFTYPE_NOT_ON_ROOT; + + /* Add the current reservation usage file */ + cft = &h->cgroup_files_dfl[3]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.current", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); + cft->seq_show = hugetlb_cgroup_read_u64_max; + cft->flags = CFTYPE_NOT_ON_ROOT; + + /* Add the events file */ + cft = &h->cgroup_files_dfl[4]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events", buf); + cft->private = MEMFILE_PRIVATE(idx, 0); + cft->seq_show = hugetlb_events_show; + cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]); + cft->flags = CFTYPE_NOT_ON_ROOT; + + /* Add the events.local file */ + cft = &h->cgroup_files_dfl[5]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events.local", buf); + cft->private = MEMFILE_PRIVATE(idx, 0); + cft->seq_show = hugetlb_events_local_show; + cft->file_offset = offsetof(struct hugetlb_cgroup, + events_local_file[idx]); + cft->flags = CFTYPE_NOT_ON_ROOT; + + /* Add the numa stat file */ + cft = &h->cgroup_files_dfl[6]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf); + cft->private = MEMFILE_PRIVATE(idx, 0); + cft->seq_show = hugetlb_cgroup_read_numa_stat; + cft->flags = CFTYPE_NOT_ON_ROOT; + + /* NULL terminate the last cft */ + cft = &h->cgroup_files_dfl[7]; + memset(cft, 0, sizeof(*cft)); + + WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys, + h->cgroup_files_dfl)); +} + +static void __init __hugetlb_cgroup_file_legacy_init(int idx) +{ + char buf[32]; + struct cftype *cft; + struct hstate *h = &hstates[idx]; + + /* format the size */ + mem_fmt(buf, sizeof(buf), huge_page_size(h)); + + /* Add the limit file */ + cft = &h->cgroup_files_legacy[0]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); + cft->read_u64 = hugetlb_cgroup_read_u64; + cft->write = hugetlb_cgroup_write_legacy; + + /* Add the reservation limit file */ + cft = &h->cgroup_files_legacy[1]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.limit_in_bytes", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); + cft->read_u64 = hugetlb_cgroup_read_u64; + cft->write = hugetlb_cgroup_write_legacy; + + /* Add the usage file */ + cft = &h->cgroup_files_legacy[2]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); + cft->read_u64 = hugetlb_cgroup_read_u64; + + /* Add the reservation usage file */ + cft = &h->cgroup_files_legacy[3]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.usage_in_bytes", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); + cft->read_u64 = hugetlb_cgroup_read_u64; + + /* Add the MAX usage file */ + cft = &h->cgroup_files_legacy[4]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE); + cft->write = hugetlb_cgroup_reset; + cft->read_u64 = hugetlb_cgroup_read_u64; + + /* Add the MAX reservation usage file */ + cft = &h->cgroup_files_legacy[5]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max_usage_in_bytes", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_MAX_USAGE); + cft->write = hugetlb_cgroup_reset; + cft->read_u64 = hugetlb_cgroup_read_u64; + + /* Add the failcntfile */ + cft = &h->cgroup_files_legacy[6]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT); + cft->write = hugetlb_cgroup_reset; + cft->read_u64 = hugetlb_cgroup_read_u64; + + /* Add the reservation failcntfile */ + cft = &h->cgroup_files_legacy[7]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.failcnt", buf); + cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_FAILCNT); + cft->write = hugetlb_cgroup_reset; + cft->read_u64 = hugetlb_cgroup_read_u64; + + /* Add the numa stat file */ + cft = &h->cgroup_files_legacy[8]; + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf); + cft->private = MEMFILE_PRIVATE(idx, 1); + cft->seq_show = hugetlb_cgroup_read_numa_stat; + + /* NULL terminate the last cft */ + cft = &h->cgroup_files_legacy[9]; + memset(cft, 0, sizeof(*cft)); + + WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys, + h->cgroup_files_legacy)); +} + +static void __init __hugetlb_cgroup_file_init(int idx) +{ + __hugetlb_cgroup_file_dfl_init(idx); + __hugetlb_cgroup_file_legacy_init(idx); +} + +void __init hugetlb_cgroup_file_init(void) +{ + struct hstate *h; + + for_each_hstate(h) { + /* + * Add cgroup control files only if the huge page consists + * of more than two normal pages. This is because we use + * page[2].private for storing cgroup details. + */ + if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER) + __hugetlb_cgroup_file_init(hstate_index(h)); + } +} + +/* + * 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, +}; |