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![Mina Almasry](/assets/img/avatar_default.png)
For shared mappings, the pointer to the hugetlb_cgroup to uncharge lives in the resv_map entries, in file_region->reservation_counter. After a call to region_chg, we charge the approprate hugetlb_cgroup, and if successful, we pass on the hugetlb_cgroup info to a follow up region_add call. When a file_region entry is added to the resv_map via region_add, we put the pointer to that cgroup in file_region->reservation_counter. If charging doesn't succeed, we report the error to the caller, so that the kernel fails the reservation. On region_del, which is when the hugetlb memory is unreserved, we also uncharge the file_region->reservation_counter. [akpm@linux-foundation.org: forward declare struct file_region] Signed-off-by: Mina Almasry <almasrymina@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: Greg Thelen <gthelen@google.com> Cc: Mike Kravetz <mike.kravetz@oracle.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/20200211213128.73302-5-almasrymina@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
252 lines
6.4 KiB
C
252 lines
6.4 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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/*
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* Minimum page order trackable by hugetlb cgroup.
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* At least 4 pages are necessary for all the tracking information.
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* The second tail page (hpage[2]) is the fault usage cgroup.
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* The third tail page (hpage[3]) is the reservation usage cgroup.
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*/
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#define HUGETLB_CGROUP_MIN_ORDER 2
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#ifdef CONFIG_CGROUP_HUGETLB
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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 {
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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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};
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static inline struct hugetlb_cgroup *
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__hugetlb_cgroup_from_page(struct page *page, bool rsvd)
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{
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VM_BUG_ON_PAGE(!PageHuge(page), page);
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if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
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return NULL;
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if (rsvd)
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return (struct hugetlb_cgroup *)page[3].private;
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else
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return (struct hugetlb_cgroup *)page[2].private;
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}
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static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
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{
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return __hugetlb_cgroup_from_page(page, false);
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}
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static inline struct hugetlb_cgroup *
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hugetlb_cgroup_from_page_rsvd(struct page *page)
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{
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return __hugetlb_cgroup_from_page(page, true);
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}
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static inline int __set_hugetlb_cgroup(struct page *page,
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struct hugetlb_cgroup *h_cg, bool rsvd)
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{
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VM_BUG_ON_PAGE(!PageHuge(page), page);
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if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
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return -1;
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if (rsvd)
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page[3].private = (unsigned long)h_cg;
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else
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page[2].private = (unsigned long)h_cg;
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return 0;
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}
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static inline int set_hugetlb_cgroup(struct page *page,
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struct hugetlb_cgroup *h_cg)
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{
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return __set_hugetlb_cgroup(page, h_cg, false);
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}
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static inline int set_hugetlb_cgroup_rsvd(struct page *page,
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struct hugetlb_cgroup *h_cg)
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{
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return __set_hugetlb_cgroup(page, 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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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_page(int idx, unsigned long nr_pages,
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struct page *page);
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extern void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
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struct page *page);
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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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extern void hugetlb_cgroup_file_init(void) __init;
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extern void hugetlb_cgroup_migrate(struct page *oldhpage,
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struct page *newhpage);
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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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{
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}
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static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
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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_page_resv(struct page *page)
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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_page_rsvd(struct page *page)
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{
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return NULL;
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}
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static inline int set_hugetlb_cgroup(struct page *page,
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struct hugetlb_cgroup *h_cg)
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{
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return 0;
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}
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static inline int set_hugetlb_cgroup_rsvd(struct page *page,
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struct hugetlb_cgroup *h_cg)
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{
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return 0;
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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 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_page(int idx, unsigned long nr_pages,
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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_page_rsvd(int idx,
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unsigned long nr_pages,
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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_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 page *oldhpage,
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struct page *newhpage)
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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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