projects/linux·blob v3.19 · refs

240 lines · 6.5 KiB

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/ftrace_event.h>
11#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" },
28#ifdef CONFIG_PAGEFLAGS_EXTENDED
29 {1UL << PG_head, "head" },
30 {1UL << PG_tail, "tail" },
31#else
32 {1UL << PG_compound, "compound" },
33#endif
34 {1UL << PG_swapcache, "swapcache" },
35 {1UL << PG_mappedtodisk, "mappedtodisk" },
36 {1UL << PG_reclaim, "reclaim" },
37 {1UL << PG_swapbacked, "swapbacked" },
38 {1UL << PG_unevictable, "unevictable" },
39#ifdef CONFIG_MMU
40 {1UL << PG_mlocked, "mlocked" },
41#endif
42#ifdef CONFIG_ARCH_USES_PG_UNCACHED
43 {1UL << PG_uncached, "uncached" },
44#endif
45#ifdef CONFIG_MEMORY_FAILURE
46 {1UL << PG_hwpoison, "hwpoison" },
47#endif
48#ifdef CONFIG_TRANSPARENT_HUGEPAGE
49 {1UL << PG_compound_lock, "compound_lock" },
50#endif
51};
52
53static void dump_flags(unsigned long flags,
54 const struct trace_print_flags *names, int count)
55{
56 const char *delim = "";
57 unsigned long mask;
58 int i;
59
60 pr_emerg("flags: %#lx(", flags);
61
62 /* remove zone id */
63 flags &= (1UL << NR_PAGEFLAGS) - 1;
64
65 for (i = 0; i < count && flags; i++) {
66
67 mask = names[i].mask;
68 if ((flags & mask) != mask)
69 continue;
70
71 flags &= ~mask;
72 pr_cont("%s%s", delim, names[i].name);
73 delim = "|";
74 }
75
76 /* check for left over flags */
77 if (flags)
78 pr_cont("%s%#lx", delim, flags);
79
80 pr_cont(")\n");
81}
82
83void dump_page_badflags(struct page *page, const char *reason,
84 unsigned long badflags)
85{
86 pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
87 page, atomic_read(&page->_count), page_mapcount(page),
88 page->mapping, page->index);
89 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
90 dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
91 if (reason)
92 pr_alert("page dumped because: %s\n", reason);
93 if (page->flags & badflags) {
94 pr_alert("bad because of flags:\n");
95 dump_flags(page->flags & badflags,
96 pageflag_names, ARRAY_SIZE(pageflag_names));
97 }
98#ifdef CONFIG_MEMCG
99 if (page->mem_cgroup)
100 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
101#endif
102}
103
104void dump_page(struct page *page, const char *reason)
105{
106 dump_page_badflags(page, reason, 0);
107}
108EXPORT_SYMBOL(dump_page);
109
110#ifdef CONFIG_DEBUG_VM
111
112static const struct trace_print_flags vmaflags_names[] = {
113 {VM_READ, "read" },
114 {VM_WRITE, "write" },
115 {VM_EXEC, "exec" },
116 {VM_SHARED, "shared" },
117 {VM_MAYREAD, "mayread" },
118 {VM_MAYWRITE, "maywrite" },
119 {VM_MAYEXEC, "mayexec" },
120 {VM_MAYSHARE, "mayshare" },
121 {VM_GROWSDOWN, "growsdown" },
122 {VM_PFNMAP, "pfnmap" },
123 {VM_DENYWRITE, "denywrite" },
124 {VM_LOCKED, "locked" },
125 {VM_IO, "io" },
126 {VM_SEQ_READ, "seqread" },
127 {VM_RAND_READ, "randread" },
128 {VM_DONTCOPY, "dontcopy" },
129 {VM_DONTEXPAND, "dontexpand" },
130 {VM_ACCOUNT, "account" },
131 {VM_NORESERVE, "noreserve" },
132 {VM_HUGETLB, "hugetlb" },
133 {VM_NONLINEAR, "nonlinear" },
134#if defined(CONFIG_X86)
135 {VM_PAT, "pat" },
136#elif defined(CONFIG_PPC)
137 {VM_SAO, "sao" },
138#elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64)
139 {VM_GROWSUP, "growsup" },
140#elif !defined(CONFIG_MMU)
141 {VM_MAPPED_COPY, "mappedcopy" },
142#else
143 {VM_ARCH_1, "arch_1" },
144#endif
145 {VM_DONTDUMP, "dontdump" },
146#ifdef CONFIG_MEM_SOFT_DIRTY
147 {VM_SOFTDIRTY, "softdirty" },
148#endif
149 {VM_MIXEDMAP, "mixedmap" },
150 {VM_HUGEPAGE, "hugepage" },
151 {VM_NOHUGEPAGE, "nohugepage" },
152 {VM_MERGEABLE, "mergeable" },
153};
154
155void dump_vma(const struct vm_area_struct *vma)
156{
157 pr_emerg("vma %p start %p end %p\n"
158 "next %p prev %p mm %p\n"
159 "prot %lx anon_vma %p vm_ops %p\n"
160 "pgoff %lx file %p private_data %p\n",
161 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
162 vma->vm_prev, vma->vm_mm,
163 (unsigned long)pgprot_val(vma->vm_page_prot),
164 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
165 vma->vm_file, vma->vm_private_data);
166 dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
167}
168EXPORT_SYMBOL(dump_vma);
169
170void dump_mm(const struct mm_struct *mm)
171{
172 pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
173#ifdef CONFIG_MMU
174 "get_unmapped_area %p\n"
175#endif
176 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
177 "pgd %p mm_users %d mm_count %d nr_ptes %lu map_count %d\n"
178 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
179 "pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n"
180 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
181 "start_brk %lx brk %lx start_stack %lx\n"
182 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
183 "binfmt %p flags %lx core_state %p\n"
184#ifdef CONFIG_AIO
185 "ioctx_table %p\n"
186#endif
187#ifdef CONFIG_MEMCG
188 "owner %p "
189#endif
190 "exe_file %p\n"
191#ifdef CONFIG_MMU_NOTIFIER
192 "mmu_notifier_mm %p\n"
193#endif
194#ifdef CONFIG_NUMA_BALANCING
195 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
196#endif
197#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
198 "tlb_flush_pending %d\n"
199#endif
200 "%s", /* This is here to hold the comma */
201
202 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
203#ifdef CONFIG_MMU
204 mm->get_unmapped_area,
205#endif
206 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
207 mm->pgd, atomic_read(&mm->mm_users),
208 atomic_read(&mm->mm_count),
209 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
210 mm->map_count,
211 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
212 mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm,
213 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
214 mm->start_brk, mm->brk, mm->start_stack,
215 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
216 mm->binfmt, mm->flags, mm->core_state,
217#ifdef CONFIG_AIO
218 mm->ioctx_table,
219#endif
220#ifdef CONFIG_MEMCG
221 mm->owner,
222#endif
223 mm->exe_file,
224#ifdef CONFIG_MMU_NOTIFIER
225 mm->mmu_notifier_mm,
226#endif
227#ifdef CONFIG_NUMA_BALANCING
228 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
229#endif
230#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
231 mm->tlb_flush_pending,
232#endif
233 "" /* This is here to not have a comma! */
234 );
235
236 dump_flags(mm->def_flags, vmaflags_names,
237 ARRAY_SIZE(vmaflags_names));
238}
239
240#endif /* CONFIG_DEBUG_VM */