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Sasha Levin31c9afa2014-10-09 15:28:37 -07001/*
2 * mm/debug.c
3 *
4 * mm/ specific debug routines.
5 *
6 */
7
Sasha Levin82742a32014-10-09 15:28:34 -07008#include <linux/kernel.h>
9#include <linux/mm.h>
Steven Rostedt (Red Hat)af658dc2015-04-29 14:36:05 -040010#include <linux/trace_events.h>
Sasha Levin82742a32014-10-09 15:28:34 -070011#include <linux/memcontrol.h>
12
13static const struct trace_print_flags pageflag_names[] = {
14 {1UL << PG_locked, "locked" },
15 {1UL << PG_error, "error" },
16 {1UL << PG_referenced, "referenced" },
17 {1UL << PG_uptodate, "uptodate" },
18 {1UL << PG_dirty, "dirty" },
19 {1UL << PG_lru, "lru" },
20 {1UL << PG_active, "active" },
21 {1UL << PG_slab, "slab" },
22 {1UL << PG_owner_priv_1, "owner_priv_1" },
23 {1UL << PG_arch_1, "arch_1" },
24 {1UL << PG_reserved, "reserved" },
25 {1UL << PG_private, "private" },
26 {1UL << PG_private_2, "private_2" },
27 {1UL << PG_writeback, "writeback" },
Sasha Levin82742a32014-10-09 15:28:34 -070028 {1UL << PG_head, "head" },
Sasha Levin82742a32014-10-09 15:28:34 -070029 {1UL << PG_swapcache, "swapcache" },
30 {1UL << PG_mappedtodisk, "mappedtodisk" },
31 {1UL << PG_reclaim, "reclaim" },
32 {1UL << PG_swapbacked, "swapbacked" },
33 {1UL << PG_unevictable, "unevictable" },
34#ifdef CONFIG_MMU
35 {1UL << PG_mlocked, "mlocked" },
36#endif
37#ifdef CONFIG_ARCH_USES_PG_UNCACHED
38 {1UL << PG_uncached, "uncached" },
39#endif
40#ifdef CONFIG_MEMORY_FAILURE
41 {1UL << PG_hwpoison, "hwpoison" },
42#endif
Vladimir Davydov33c3fc72015-09-09 15:35:45 -070043#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
44 {1UL << PG_young, "young" },
45 {1UL << PG_idle, "idle" },
46#endif
Sasha Levin82742a32014-10-09 15:28:34 -070047};
48
49static void dump_flags(unsigned long flags,
50 const struct trace_print_flags *names, int count)
51{
52 const char *delim = "";
53 unsigned long mask;
54 int i;
55
Andrew Morton7a82ca02014-10-09 15:28:41 -070056 pr_emerg("flags: %#lx(", flags);
Sasha Levin82742a32014-10-09 15:28:34 -070057
58 /* remove zone id */
59 flags &= (1UL << NR_PAGEFLAGS) - 1;
60
61 for (i = 0; i < count && flags; i++) {
62
63 mask = names[i].mask;
64 if ((flags & mask) != mask)
65 continue;
66
67 flags &= ~mask;
Andrew Morton7a82ca02014-10-09 15:28:41 -070068 pr_cont("%s%s", delim, names[i].name);
Sasha Levin82742a32014-10-09 15:28:34 -070069 delim = "|";
70 }
71
72 /* check for left over flags */
73 if (flags)
Andrew Morton7a82ca02014-10-09 15:28:41 -070074 pr_cont("%s%#lx", delim, flags);
Sasha Levin82742a32014-10-09 15:28:34 -070075
Andrew Morton7a82ca02014-10-09 15:28:41 -070076 pr_cont(")\n");
Sasha Levin82742a32014-10-09 15:28:34 -070077}
78
79void dump_page_badflags(struct page *page, const char *reason,
80 unsigned long badflags)
81{
Andrew Morton7a82ca02014-10-09 15:28:41 -070082 pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
83 page, atomic_read(&page->_count), page_mapcount(page),
84 page->mapping, page->index);
Sasha Levin82742a32014-10-09 15:28:34 -070085 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
86 dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
87 if (reason)
88 pr_alert("page dumped because: %s\n", reason);
89 if (page->flags & badflags) {
90 pr_alert("bad because of flags:\n");
91 dump_flags(page->flags & badflags,
92 pageflag_names, ARRAY_SIZE(pageflag_names));
93 }
Johannes Weiner9edad6e2014-12-10 15:44:58 -080094#ifdef CONFIG_MEMCG
95 if (page->mem_cgroup)
96 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
97#endif
Sasha Levin82742a32014-10-09 15:28:34 -070098}
99
100void dump_page(struct page *page, const char *reason)
101{
102 dump_page_badflags(page, reason, 0);
103}
104EXPORT_SYMBOL(dump_page);
105
106#ifdef CONFIG_DEBUG_VM
107
108static const struct trace_print_flags vmaflags_names[] = {
109 {VM_READ, "read" },
110 {VM_WRITE, "write" },
111 {VM_EXEC, "exec" },
112 {VM_SHARED, "shared" },
113 {VM_MAYREAD, "mayread" },
114 {VM_MAYWRITE, "maywrite" },
115 {VM_MAYEXEC, "mayexec" },
116 {VM_MAYSHARE, "mayshare" },
117 {VM_GROWSDOWN, "growsdown" },
118 {VM_PFNMAP, "pfnmap" },
119 {VM_DENYWRITE, "denywrite" },
Eric B Munsonde60f5f2015-11-05 18:51:36 -0800120 {VM_LOCKONFAULT, "lockonfault" },
Sasha Levin82742a32014-10-09 15:28:34 -0700121 {VM_LOCKED, "locked" },
122 {VM_IO, "io" },
123 {VM_SEQ_READ, "seqread" },
124 {VM_RAND_READ, "randread" },
125 {VM_DONTCOPY, "dontcopy" },
126 {VM_DONTEXPAND, "dontexpand" },
127 {VM_ACCOUNT, "account" },
128 {VM_NORESERVE, "noreserve" },
129 {VM_HUGETLB, "hugetlb" },
Sasha Levin82742a32014-10-09 15:28:34 -0700130#if defined(CONFIG_X86)
131 {VM_PAT, "pat" },
132#elif defined(CONFIG_PPC)
133 {VM_SAO, "sao" },
134#elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64)
135 {VM_GROWSUP, "growsup" },
136#elif !defined(CONFIG_MMU)
137 {VM_MAPPED_COPY, "mappedcopy" },
138#else
139 {VM_ARCH_1, "arch_1" },
140#endif
141 {VM_DONTDUMP, "dontdump" },
142#ifdef CONFIG_MEM_SOFT_DIRTY
143 {VM_SOFTDIRTY, "softdirty" },
144#endif
145 {VM_MIXEDMAP, "mixedmap" },
146 {VM_HUGEPAGE, "hugepage" },
147 {VM_NOHUGEPAGE, "nohugepage" },
148 {VM_MERGEABLE, "mergeable" },
149};
150
151void dump_vma(const struct vm_area_struct *vma)
152{
Andrew Morton7a82ca02014-10-09 15:28:41 -0700153 pr_emerg("vma %p start %p end %p\n"
Sasha Levin82742a32014-10-09 15:28:34 -0700154 "next %p prev %p mm %p\n"
155 "prot %lx anon_vma %p vm_ops %p\n"
156 "pgoff %lx file %p private_data %p\n",
157 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
158 vma->vm_prev, vma->vm_mm,
159 (unsigned long)pgprot_val(vma->vm_page_prot),
160 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
161 vma->vm_file, vma->vm_private_data);
162 dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
163}
164EXPORT_SYMBOL(dump_vma);
165
Sasha Levin31c9afa2014-10-09 15:28:37 -0700166void dump_mm(const struct mm_struct *mm)
167{
Andrew Morton7a82ca02014-10-09 15:28:41 -0700168 pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700169#ifdef CONFIG_MMU
170 "get_unmapped_area %p\n"
171#endif
172 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
Kirill A. Shutemovdc6c9a32015-02-11 15:26:50 -0800173 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700174 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
Konstantin Khlebnikov84638332016-01-14 15:22:07 -0800175 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700176 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
177 "start_brk %lx brk %lx start_stack %lx\n"
178 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
179 "binfmt %p flags %lx core_state %p\n"
180#ifdef CONFIG_AIO
181 "ioctx_table %p\n"
182#endif
183#ifdef CONFIG_MEMCG
184 "owner %p "
185#endif
186 "exe_file %p\n"
187#ifdef CONFIG_MMU_NOTIFIER
188 "mmu_notifier_mm %p\n"
189#endif
190#ifdef CONFIG_NUMA_BALANCING
191 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
192#endif
193#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
194 "tlb_flush_pending %d\n"
195#endif
196 "%s", /* This is here to hold the comma */
197
198 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
199#ifdef CONFIG_MMU
200 mm->get_unmapped_area,
201#endif
202 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
203 mm->pgd, atomic_read(&mm->mm_users),
204 atomic_read(&mm->mm_count),
205 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
Kirill A. Shutemovdc6c9a32015-02-11 15:26:50 -0800206 mm_nr_pmds((struct mm_struct *)mm),
Sasha Levin31c9afa2014-10-09 15:28:37 -0700207 mm->map_count,
208 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
Konstantin Khlebnikov84638332016-01-14 15:22:07 -0800209 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
Sasha Levin31c9afa2014-10-09 15:28:37 -0700210 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
211 mm->start_brk, mm->brk, mm->start_stack,
212 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
213 mm->binfmt, mm->flags, mm->core_state,
214#ifdef CONFIG_AIO
215 mm->ioctx_table,
216#endif
217#ifdef CONFIG_MEMCG
218 mm->owner,
219#endif
220 mm->exe_file,
221#ifdef CONFIG_MMU_NOTIFIER
222 mm->mmu_notifier_mm,
223#endif
224#ifdef CONFIG_NUMA_BALANCING
225 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
226#endif
227#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
228 mm->tlb_flush_pending,
229#endif
230 "" /* This is here to not have a comma! */
231 );
232
233 dump_flags(mm->def_flags, vmaflags_names,
234 ARRAY_SIZE(vmaflags_names));
235}
236
Sasha Levin82742a32014-10-09 15:28:34 -0700237#endif /* CONFIG_DEBUG_VM */