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