1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * mm/debug.c 4 * 5 * mm/ specific debug routines. 6 * 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/mm.h> 11 #include <linux/trace_events.h> 12 #include <linux/memcontrol.h> 13 #include <trace/events/mmflags.h> 14 #include <linux/migrate.h> 15 #include <linux/page_owner.h> 16 17 #include "internal.h" 18 19 char *migrate_reason_names[MR_TYPES] = { 20 "compaction", 21 "memory_failure", 22 "memory_hotplug", 23 "syscall_or_cpuset", 24 "mempolicy_mbind", 25 "numa_misplaced", 26 "cma", 27 }; 28 29 const struct trace_print_flags pageflag_names[] = { 30 __def_pageflag_names, 31 {0, NULL} 32 }; 33 34 const struct trace_print_flags gfpflag_names[] = { 35 __def_gfpflag_names, 36 {0, NULL} 37 }; 38 39 const struct trace_print_flags vmaflag_names[] = { 40 __def_vmaflag_names, 41 {0, NULL} 42 }; 43 44 void __dump_page(struct page *page, const char *reason) 45 { 46 /* 47 * Avoid VM_BUG_ON() in page_mapcount(). 48 * page->_mapcount space in struct page is used by sl[aou]b pages to 49 * encode own info. 50 */ 51 int mapcount = PageSlab(page) ? 0 : page_mapcount(page); 52 53 pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx", 54 page, page_ref_count(page), mapcount, 55 page->mapping, page_to_pgoff(page)); 56 if (PageCompound(page)) 57 pr_cont(" compound_mapcount: %d", compound_mapcount(page)); 58 pr_cont("\n"); 59 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1); 60 61 pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags); 62 63 print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32, 64 sizeof(unsigned long), page, 65 sizeof(struct page), false); 66 67 if (reason) 68 pr_alert("page dumped because: %s\n", reason); 69 70 #ifdef CONFIG_MEMCG 71 if (page->mem_cgroup) 72 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup); 73 #endif 74 } 75 76 void dump_page(struct page *page, const char *reason) 77 { 78 __dump_page(page, reason); 79 dump_page_owner(page); 80 } 81 EXPORT_SYMBOL(dump_page); 82 83 #ifdef CONFIG_DEBUG_VM 84 85 void dump_vma(const struct vm_area_struct *vma) 86 { 87 pr_emerg("vma %p start %p end %p\n" 88 "next %p prev %p mm %p\n" 89 "prot %lx anon_vma %p vm_ops %p\n" 90 "pgoff %lx file %p private_data %p\n" 91 "flags: %#lx(%pGv)\n", 92 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next, 93 vma->vm_prev, vma->vm_mm, 94 (unsigned long)pgprot_val(vma->vm_page_prot), 95 vma->anon_vma, vma->vm_ops, vma->vm_pgoff, 96 vma->vm_file, vma->vm_private_data, 97 vma->vm_flags, &vma->vm_flags); 98 } 99 EXPORT_SYMBOL(dump_vma); 100 101 void dump_mm(const struct mm_struct *mm) 102 { 103 pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n" 104 #ifdef CONFIG_MMU 105 "get_unmapped_area %p\n" 106 #endif 107 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n" 108 "pgd %p mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n" 109 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n" 110 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n" 111 "start_code %lx end_code %lx start_data %lx end_data %lx\n" 112 "start_brk %lx brk %lx start_stack %lx\n" 113 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n" 114 "binfmt %p flags %lx core_state %p\n" 115 #ifdef CONFIG_AIO 116 "ioctx_table %p\n" 117 #endif 118 #ifdef CONFIG_MEMCG 119 "owner %p " 120 #endif 121 "exe_file %p\n" 122 #ifdef CONFIG_MMU_NOTIFIER 123 "mmu_notifier_mm %p\n" 124 #endif 125 #ifdef CONFIG_NUMA_BALANCING 126 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n" 127 #endif 128 "tlb_flush_pending %d\n" 129 "def_flags: %#lx(%pGv)\n", 130 131 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size, 132 #ifdef CONFIG_MMU 133 mm->get_unmapped_area, 134 #endif 135 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end, 136 mm->pgd, atomic_read(&mm->mm_users), 137 atomic_read(&mm->mm_count), 138 mm_pgtables_bytes(mm), 139 mm->map_count, 140 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm, 141 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm, 142 mm->start_code, mm->end_code, mm->start_data, mm->end_data, 143 mm->start_brk, mm->brk, mm->start_stack, 144 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end, 145 mm->binfmt, mm->flags, mm->core_state, 146 #ifdef CONFIG_AIO 147 mm->ioctx_table, 148 #endif 149 #ifdef CONFIG_MEMCG 150 mm->owner, 151 #endif 152 mm->exe_file, 153 #ifdef CONFIG_MMU_NOTIFIER 154 mm->mmu_notifier_mm, 155 #endif 156 #ifdef CONFIG_NUMA_BALANCING 157 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq, 158 #endif 159 atomic_read(&mm->tlb_flush_pending), 160 mm->def_flags, &mm->def_flags 161 ); 162 } 163 164 #endif /* CONFIG_DEBUG_VM */ 165