mirror of
https://gitee.com/bianbu-linux/linux-6.6
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dad6a5eb55
Patch series "mm,huge,rmap: unify and speed up compound mapcounts".
This patch (of 3):
We want to declare one more int in the first tail of a compound page: that
first tail page being valuable property, since every compound page has a
first tail, but perhaps no more than that.
No problem on 64-bit: there is already space for it. No problem with
32-bit THPs: 5.18 commit 5232c63f46 ("mm: Make compound_pincount always
available") kindly cleared the space for it, apparently not realizing that
only 64-bit architectures enable CONFIG_THP_SWAP (whose use of tail
page->private might conflict) - but make sure of that in its Kconfig.
But hugetlb pages use tail page->private of the first tail page for a
subpool pointer, which will conflict; and they also use page->private of
the 2nd, 3rd and 4th tails.
Undo "mm: add private field of first tail to struct page and struct
folio"'s recent addition of private_1 to the folio tail: instead add
hugetlb_subpool, hugetlb_cgroup, hugetlb_cgroup_rsvd, hugetlb_hwpoison to
a second tail page of the folio: THP has long been using several fields of
that tail, so make better use of it for hugetlb too. This is not how a
generic folio should be declared in future, but it is an effective
transitional way to make use of it.
Delete the SUBPAGE_INDEX stuff, but keep __NR_USED_SUBPAGE: now 3.
[hughd@google.com: prefix folio's page_1 and page_2 with double underscore,
give folio's _flags_2 and _head_2 a line documentation each]
Link: https://lkml.kernel.org/r/9e2cb6b-5b58-d3f2-b5ee-5f8a14e8f10@google.com
Link: https://lkml.kernel.org/r/5f52de70-975-e94f-f141-543765736181@google.com
Link: https://lkml.kernel.org/r/3818cc9a-9999-d064-d778-9c94c5911e6@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: James Houghton <jthoughton@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
282 lines
7.1 KiB
C
282 lines
7.1 KiB
C
/*
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* Copyright IBM Corporation, 2012
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#ifndef _LINUX_HUGETLB_CGROUP_H
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#define _LINUX_HUGETLB_CGROUP_H
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#include <linux/mmdebug.h>
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struct hugetlb_cgroup;
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struct resv_map;
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struct file_region;
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#ifdef CONFIG_CGROUP_HUGETLB
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/*
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* Minimum page order trackable by hugetlb cgroup.
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* At least 3 pages are necessary for all the tracking information.
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* The second tail page contains all of the hugetlb-specific fields.
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*/
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#define HUGETLB_CGROUP_MIN_ORDER order_base_2(__NR_USED_SUBPAGE)
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enum hugetlb_memory_event {
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HUGETLB_MAX,
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HUGETLB_NR_MEMORY_EVENTS,
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};
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struct hugetlb_cgroup_per_node {
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/* hugetlb usage in pages over all hstates. */
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unsigned long usage[HUGE_MAX_HSTATE];
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};
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struct hugetlb_cgroup {
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struct cgroup_subsys_state css;
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/*
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* the counter to account for hugepages from hugetlb.
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*/
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struct page_counter hugepage[HUGE_MAX_HSTATE];
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/*
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* the counter to account for hugepage reservations from hugetlb.
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*/
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struct page_counter rsvd_hugepage[HUGE_MAX_HSTATE];
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atomic_long_t events[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
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atomic_long_t events_local[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
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/* Handle for "hugetlb.events" */
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struct cgroup_file events_file[HUGE_MAX_HSTATE];
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/* Handle for "hugetlb.events.local" */
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struct cgroup_file events_local_file[HUGE_MAX_HSTATE];
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struct hugetlb_cgroup_per_node *nodeinfo[];
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};
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static inline struct hugetlb_cgroup *
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__hugetlb_cgroup_from_folio(struct folio *folio, bool rsvd)
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{
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VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
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if (folio_order(folio) < HUGETLB_CGROUP_MIN_ORDER)
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return NULL;
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if (rsvd)
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return folio->_hugetlb_cgroup_rsvd;
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else
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return folio->_hugetlb_cgroup;
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}
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static inline struct hugetlb_cgroup *hugetlb_cgroup_from_folio(struct folio *folio)
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{
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return __hugetlb_cgroup_from_folio(folio, false);
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}
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static inline struct hugetlb_cgroup *
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hugetlb_cgroup_from_folio_rsvd(struct folio *folio)
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{
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return __hugetlb_cgroup_from_folio(folio, true);
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}
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static inline void __set_hugetlb_cgroup(struct folio *folio,
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struct hugetlb_cgroup *h_cg, bool rsvd)
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{
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VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
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if (folio_order(folio) < HUGETLB_CGROUP_MIN_ORDER)
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return;
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if (rsvd)
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folio->_hugetlb_cgroup_rsvd = h_cg;
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else
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folio->_hugetlb_cgroup = h_cg;
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}
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static inline void set_hugetlb_cgroup(struct folio *folio,
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struct hugetlb_cgroup *h_cg)
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{
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__set_hugetlb_cgroup(folio, h_cg, false);
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}
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static inline void set_hugetlb_cgroup_rsvd(struct folio *folio,
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struct hugetlb_cgroup *h_cg)
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{
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__set_hugetlb_cgroup(folio, h_cg, true);
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}
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static inline bool hugetlb_cgroup_disabled(void)
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{
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return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
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}
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static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
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{
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css_put(&h_cg->css);
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}
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static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
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struct resv_map *resv_map)
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{
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if (resv_map->css)
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css_get(resv_map->css);
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}
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static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
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struct resv_map *resv_map)
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{
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if (resv_map->css)
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css_put(resv_map->css);
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}
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extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup **ptr);
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extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup **ptr);
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extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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struct page *page);
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extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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struct page *page);
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extern void hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages,
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struct folio *folio);
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extern void hugetlb_cgroup_uncharge_folio_rsvd(int idx, unsigned long nr_pages,
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struct folio *folio);
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extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg);
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extern void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg);
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extern void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
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unsigned long start,
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unsigned long end);
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extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
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struct file_region *rg,
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unsigned long nr_pages,
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bool region_del);
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extern void hugetlb_cgroup_file_init(void) __init;
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extern void hugetlb_cgroup_migrate(struct folio *old_folio,
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struct folio *new_folio);
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#else
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static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
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struct file_region *rg,
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unsigned long nr_pages,
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bool region_del)
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{
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}
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static inline struct hugetlb_cgroup *hugetlb_cgroup_from_folio(struct folio *folio)
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{
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return NULL;
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}
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static inline struct hugetlb_cgroup *
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hugetlb_cgroup_from_folio_rsvd(struct folio *folio)
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{
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return NULL;
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}
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static inline void set_hugetlb_cgroup(struct folio *folio,
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struct hugetlb_cgroup *h_cg)
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{
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}
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static inline void set_hugetlb_cgroup_rsvd(struct folio *folio,
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struct hugetlb_cgroup *h_cg)
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{
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}
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static inline bool hugetlb_cgroup_disabled(void)
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{
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return true;
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}
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static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
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{
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}
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static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
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struct resv_map *resv_map)
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{
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}
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static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
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struct resv_map *resv_map)
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{
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}
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static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup **ptr)
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{
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return 0;
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}
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static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
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unsigned long nr_pages,
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struct hugetlb_cgroup **ptr)
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{
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return 0;
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}
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static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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struct page *page)
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{
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}
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static inline void
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hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg,
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struct page *page)
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{
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}
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static inline void hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages,
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struct folio *folio)
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{
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}
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static inline void hugetlb_cgroup_uncharge_folio_rsvd(int idx,
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unsigned long nr_pages,
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struct folio *folio)
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{
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}
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static inline void hugetlb_cgroup_uncharge_cgroup(int idx,
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unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg)
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{
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}
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static inline void
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hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg)
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{
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}
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static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
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unsigned long start,
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unsigned long end)
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{
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}
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static inline void hugetlb_cgroup_file_init(void)
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{
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}
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static inline void hugetlb_cgroup_migrate(struct folio *old_folio,
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struct folio *new_folio)
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{
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}
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#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
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#endif
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