| 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:%p count:%d mapcount:%d mapping:%p 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:%p\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 %p start %p end %p\n" |
| 83 | "next %p prev %p mm %p\n" |
| 84 | "prot %lx anon_vma %p vm_ops %p\n" |
| 85 | "pgoff %lx file %p private_data %p\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 %p mmap %p seqnum %d task_size %lu\n" |
| 99 | #ifdef CONFIG_MMU |
| 100 | "get_unmapped_area %p\n" |
| 101 | #endif |
| 102 | "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n" |
| 103 | "pgd %p 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 %p flags %lx core_state %p\n" |
| 110 | #ifdef CONFIG_AIO |
| 111 | "ioctx_table %p\n" |
| 112 | #endif |
| 113 | #ifdef CONFIG_MEMCG |
| 114 | "owner %p " |
| 115 | #endif |
| 116 | "exe_file %p\n" |
| 117 | #ifdef CONFIG_MMU_NOTIFIER |
| 118 | "mmu_notifier_mm %p\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, 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 */ |