path: root/mm/debug.c (plain)
blob: dc7ad1f0a3f90e736c9839b184d21f4414e3ee8b

1	/*
2	* mm/debug.c
3	*
4	* mm/ specific debug routines.
5	*
6	*/
7
8	#include <linux/kernel.h>
9	#include <linux/mm.h>
10	#include <linux/trace_events.h>
11	#include <linux/memcontrol.h>
12	#include <trace/events/mmflags.h>
13	#include <linux/migrate.h>
14	#include <linux/page_owner.h>
15
16	#include "internal.h"
17
18	char *migrate_reason_names[MR_TYPES] = {
19	"compaction",
20	"memory_failure",
21	"memory_hotplug",
22	"syscall_or_cpuset",
23	"mempolicy_mbind",
24	"numa_misplaced",
25	"cma",
26	};
27
28	const struct trace_print_flags pageflag_names[] = {
29	__def_pageflag_names,
30	{0, NULL}
31	};
32
33	const struct trace_print_flags gfpflag_names[] = {
34	__def_gfpflag_names,
35	{0, NULL}
36	};
37
38	const struct trace_print_flags vmaflag_names[] = {
39	__def_vmaflag_names,
40	{0, NULL}
41	};
42
43	void __dump_page(struct page *page, const char *reason)
44	{
45	/*
46	* Avoid VM_BUG_ON() in page_mapcount().
47	* page->_mapcount space in struct page is used by sl[aou]b pages to
48	* encode own info.
49	*/
50	int mapcount = PageSlab(page) ? 0 : page_mapcount(page);
51
52	pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
53	page, page_ref_count(page), mapcount,
54	page->mapping, page_to_pgoff(page));
55	if (PageCompound(page))
56	pr_cont(" compound_mapcount: %d", compound_mapcount(page));
57	pr_cont("\n");
58	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
59
60	pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
61
62	if (reason)
63	pr_alert("page dumped because: %s\n", reason);
64
65	#ifdef CONFIG_MEMCG
66	if (page->mem_cgroup)
67	pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup);
68	#endif
69	}
70
71	void dump_page(struct page *page, const char *reason)
72	{
73	__dump_page(page, reason);
74	dump_page_owner(page);
75	}
76	EXPORT_SYMBOL(dump_page);
77
78	#ifdef CONFIG_DEBUG_VM
79
80	void dump_vma(const struct vm_area_struct *vma)
81	{
82	pr_emerg("vma %px start %px end %px\n"
83	"next %px prev %px mm %px\n"
84	"prot %lx anon_vma %px vm_ops %px\n"
85	"pgoff %lx file %px private_data %px\n"
86	"flags: %#lx(%pGv)\n",
87	vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
88	vma->vm_prev, vma->vm_mm,
89	(unsigned long)pgprot_val(vma->vm_page_prot),
90	vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
91	vma->vm_file, vma->vm_private_data,
92	vma->vm_flags, &vma->vm_flags);
93	}
94	EXPORT_SYMBOL(dump_vma);
95
96	void dump_mm(const struct mm_struct *mm)
97	{
98	pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
99	#ifdef CONFIG_MMU
100	"get_unmapped_area %px\n"
101	#endif
102	"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
103	"pgd %px mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
104	"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
105	"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
106	"start_code %lx end_code %lx start_data %lx end_data %lx\n"
107	"start_brk %lx brk %lx start_stack %lx\n"
108	"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
109	"binfmt %px flags %lx core_state %px\n"
110	#ifdef CONFIG_AIO
111	"ioctx_table %px\n"
112	#endif
113	#ifdef CONFIG_MEMCG
114	"owner %px "
115	#endif
116	"exe_file %px\n"
117	#ifdef CONFIG_MMU_NOTIFIER
118	"mmu_notifier_mm %px\n"
119	#endif
120	#ifdef CONFIG_NUMA_BALANCING
121	"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
122	#endif
123	#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
124	"tlb_flush_pending %d\n"
125	#endif
126	"def_flags: %#lx(%pGv)\n",
127
128	mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
129	#ifdef CONFIG_MMU
130	mm->get_unmapped_area,
131	#endif
132	mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
133	mm->pgd, atomic_read(&mm->mm_users),
134	atomic_read(&mm->mm_count),
135	atomic_long_read((atomic_long_t *)&mm->nr_ptes),
136	mm_nr_pmds((struct mm_struct *)mm),
137	mm->map_count,
138	mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
139	mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
140	mm->start_code, mm->end_code, mm->start_data, mm->end_data,
141	mm->start_brk, mm->brk, mm->start_stack,
142	mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
143	mm->binfmt, mm->flags, mm->core_state,
144	#ifdef CONFIG_AIO
145	mm->ioctx_table,
146	#endif
147	#ifdef CONFIG_MEMCG
148	mm->owner,
149	#endif
150	mm->exe_file,
151	#ifdef CONFIG_MMU_NOTIFIER
152	mm->mmu_notifier_mm,
153	#endif
154	#ifdef CONFIG_NUMA_BALANCING
155	mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
156	#endif
157	#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
158	mm->tlb_flush_pending,
159	#endif
160	mm->def_flags, &mm->def_flags
161	);
162	}
163
164	#endif /* CONFIG_DEBUG_VM */
165