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kernel/include/linux/hugetlb_cgroup.h
Frank van der Linden 59838b2566 mm, hugetlb: remove HUGETLB_CGROUP_MIN_ORDER 
Originally, hugetlb_cgroup was the only hugetlb user of tail page
structure fields.  So, the code defined and checked against
HUGETLB_CGROUP_MIN_ORDER to make sure pages weren't too small to use.

However, by now, tail page #2 is used to store hugetlb hwpoison and
subpool information as well.  In other words, without that tail page
hugetlb doesn't work.

Acknowledge this fact by getting rid of HUGETLB_CGROUP_MIN_ORDER and
checks against it.  Instead, just check for the minimum viable page order
at hstate creation time.

Link: https://lkml.kernel.org/r/20231004153248.3842997-1-fvdl@google.com
Signed-off-by: Frank van der Linden <fvdl@google.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-10-18 14:34:17 -07:00

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/*
* Copyright IBM Corporation, 2012
* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.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.
*
*/
#ifndef _LINUX_HUGETLB_CGROUP_H
#define _LINUX_HUGETLB_CGROUP_H
#include <linux/mmdebug.h>
struct hugetlb_cgroup;
struct resv_map;
struct file_region;
#ifdef CONFIG_CGROUP_HUGETLB
enum hugetlb_memory_event {
HUGETLB_MAX,
HUGETLB_NR_MEMORY_EVENTS,
};
struct hugetlb_cgroup_per_node {
/* hugetlb usage in pages over all hstates. */
unsigned long usage[HUGE_MAX_HSTATE];
};
struct hugetlb_cgroup {
struct cgroup_subsys_state css;
/*
* the counter to account for hugepages from hugetlb.
*/
struct page_counter hugepage[HUGE_MAX_HSTATE];
/*
* the counter to account for hugepage reservations from hugetlb.
*/
struct page_counter rsvd_hugepage[HUGE_MAX_HSTATE];
atomic_long_t events[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
atomic_long_t events_local[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
/* Handle for "hugetlb.events" */
struct cgroup_file events_file[HUGE_MAX_HSTATE];
/* Handle for "hugetlb.events.local" */
struct cgroup_file events_local_file[HUGE_MAX_HSTATE];
struct hugetlb_cgroup_per_node *nodeinfo[];
};
static inline struct hugetlb_cgroup *
__hugetlb_cgroup_from_folio(struct folio *folio, bool rsvd)
{
VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
if (rsvd)
return folio->_hugetlb_cgroup_rsvd;
else
return folio->_hugetlb_cgroup;
}
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_folio(struct folio *folio)
{
return __hugetlb_cgroup_from_folio(folio, false);
}
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_folio_rsvd(struct folio *folio)
{
return __hugetlb_cgroup_from_folio(folio, true);
}
static inline void __set_hugetlb_cgroup(struct folio *folio,
struct hugetlb_cgroup *h_cg, bool rsvd)
{
VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
if (rsvd)
folio->_hugetlb_cgroup_rsvd = h_cg;
else
folio->_hugetlb_cgroup = h_cg;
}
static inline void set_hugetlb_cgroup(struct folio *folio,
struct hugetlb_cgroup *h_cg)
{
__set_hugetlb_cgroup(folio, h_cg, false);
}
static inline void set_hugetlb_cgroup_rsvd(struct folio *folio,
struct hugetlb_cgroup *h_cg)
{
__set_hugetlb_cgroup(folio, h_cg, true);
}
static inline bool hugetlb_cgroup_disabled(void)
{
return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
}
static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
{
css_put(&h_cg->css);
}
static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
struct resv_map *resv_map)
{
if (resv_map->css)
css_get(resv_map->css);
}
static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
struct resv_map *resv_map)
{
if (resv_map->css)
css_put(resv_map->css);
}
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 folio *folio);
extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct folio *folio);
extern void hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages,
struct folio *folio);
extern void hugetlb_cgroup_uncharge_folio_rsvd(int idx, unsigned long nr_pages,
struct folio *folio);
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 resv_map *resv,
unsigned long start,
unsigned long end);
extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
struct file_region *rg,
unsigned long nr_pages,
bool region_del);
extern void hugetlb_cgroup_file_init(void) __init;
extern void hugetlb_cgroup_migrate(struct folio *old_folio,
struct folio *new_folio);
#else
static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
struct file_region *rg,
unsigned long nr_pages,
bool region_del)
{
}
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_folio(struct folio *folio)
{
return NULL;
}
static inline struct hugetlb_cgroup *
hugetlb_cgroup_from_folio_rsvd(struct folio *folio)
{
return NULL;
}
static inline void set_hugetlb_cgroup(struct folio *folio,
struct hugetlb_cgroup *h_cg)
{
}
static inline void set_hugetlb_cgroup_rsvd(struct folio *folio,
struct hugetlb_cgroup *h_cg)
{
}
static inline bool hugetlb_cgroup_disabled(void)
{
return true;
}
static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
{
}
static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
struct resv_map *resv_map)
{
}
static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
struct resv_map *resv_map)
{
}
static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup **ptr)
{
return 0;
}
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 folio *folio)
{
}
static inline void
hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct folio *folio)
{
}
static inline void hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages,
struct folio *folio)
{
}
static inline void hugetlb_cgroup_uncharge_folio_rsvd(int idx,
unsigned long nr_pages,
struct folio *folio)
{
}
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_rsvd(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg)
{
}
static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
unsigned long start,
unsigned long end)
{
}
static inline void hugetlb_cgroup_file_init(void)
{
}
static inline void hugetlb_cgroup_migrate(struct folio *old_folio,
struct folio *new_folio)
{
}
#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
#endif
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