309381feae
Most of the VM_BUG_ON assertions are performed on a page. Usually, when one of these assertions fails we'll get a BUG_ON with a call stack and the registers. I've recently noticed based on the requests to add a small piece of code that dumps the page to various VM_BUG_ON sites that the page dump is quite useful to people debugging issues in mm. This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what VM_BUG_ON() does, also dumps the page before executing the actual BUG_ON. [akpm@linux-foundation.org: fix up includes] Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
127 lines
3 KiB
C
127 lines
3 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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#include <linux/res_counter.h>
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struct hugetlb_cgroup;
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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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*/
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#define HUGETLB_CGROUP_MIN_ORDER 2
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#ifdef CONFIG_CGROUP_HUGETLB
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static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
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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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return (struct hugetlb_cgroup *)page[2].lru.next;
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}
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static inline
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int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
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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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page[2].lru.next = (void *)h_cg;
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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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if (hugetlb_subsys.disabled)
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return true;
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return false;
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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 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_uncharge_page(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_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 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
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int set_hugetlb_cgroup(struct page *page, 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
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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 void
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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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return;
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}
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static inline void
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hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
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{
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return;
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}
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static inline void
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hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
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struct hugetlb_cgroup *h_cg)
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{
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return;
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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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return;
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}
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#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
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#endif
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