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 bool page_poisoned = PagePoisoned(page); 47 int mapcount; 48 49 /* 50 * If struct page is poisoned don't access Page*() functions as that 51 * leads to recursive loop. Page*() check for poisoned pages, and calls 52 * dump_page() when detected. 53 */ 54 if (page_poisoned) { 55 pr_emerg("page:%px is uninitialized and poisoned", page); 56 goto hex_only; 57 } 58 59 /* 60 * Avoid VM_BUG_ON() in page_mapcount(). 61 * page->_mapcount space in struct page is used by sl[aou]b pages to 62 * encode own info. 63 */ 64 mapcount = PageSlab(page) ? 0 : page_mapcount(page); 65 66 pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx", 67 page, page_ref_count(page), mapcount, 68 page->mapping, page_to_pgoff(page)); 69 if (PageCompound(page)) 70 pr_cont(" compound_mapcount: %d", compound_mapcount(page)); 71 pr_cont("\n"); 72 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1); 73 74 pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags); 75 76 hex_only: 77 print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32, 78 sizeof(unsigned long), page, 79 sizeof(struct page), false); 80 81 if (reason) 82 pr_alert("page dumped because: %s\n", reason); 83 84 #ifdef CONFIG_MEMCG 85 if (!page_poisoned && page->mem_cgroup) 86 pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup); 87 #endif 88 } 89 90 void dump_page(struct page *page, const char *reason) 91 { 92 __dump_page(page, reason); 93 dump_page_owner(page); 94 } 95 EXPORT_SYMBOL(dump_page); 96 97 #ifdef CONFIG_DEBUG_VM 98 99 void dump_vma(const struct vm_area_struct *vma) 100 { 101 pr_emerg("vma %px start %px end %px\n" 102 "next %px prev %px mm %px\n" 103 "prot %lx anon_vma %px vm_ops %px\n" 104 "pgoff %lx file %px private_data %px\n" 105 "flags: %#lx(%pGv)\n", 106 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next, 107 vma->vm_prev, vma->vm_mm, 108 (unsigned long)pgprot_val(vma->vm_page_prot), 109 vma->anon_vma, vma->vm_ops, vma->vm_pgoff, 110 vma->vm_file, vma->vm_private_data, 111 vma->vm_flags, &vma->vm_flags); 112 } 113 EXPORT_SYMBOL(dump_vma); 114 115 void dump_mm(const struct mm_struct *mm) 116 { 117 pr_emerg("mm %px mmap %px seqnum %d task_size %lu\n" 118 #ifdef CONFIG_MMU 119 "get_unmapped_area %px\n" 120 #endif 121 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n" 122 "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n" 123 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n" 124 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n" 125 "start_code %lx end_code %lx start_data %lx end_data %lx\n" 126 "start_brk %lx brk %lx start_stack %lx\n" 127 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n" 128 "binfmt %px flags %lx core_state %px\n" 129 #ifdef CONFIG_AIO 130 "ioctx_table %px\n" 131 #endif 132 #ifdef CONFIG_MEMCG 133 "owner %px " 134 #endif 135 "exe_file %px\n" 136 #ifdef CONFIG_MMU_NOTIFIER 137 "mmu_notifier_mm %px\n" 138 #endif 139 #ifdef CONFIG_NUMA_BALANCING 140 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n" 141 #endif 142 "tlb_flush_pending %d\n" 143 "def_flags: %#lx(%pGv)\n", 144 145 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size, 146 #ifdef CONFIG_MMU 147 mm->get_unmapped_area, 148 #endif 149 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end, 150 mm->pgd, atomic_read(&mm->mm_users), 151 atomic_read(&mm->mm_count), 152 mm_pgtables_bytes(mm), 153 mm->map_count, 154 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm, 155 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm, 156 mm->start_code, mm->end_code, mm->start_data, mm->end_data, 157 mm->start_brk, mm->brk, mm->start_stack, 158 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end, 159 mm->binfmt, mm->flags, mm->core_state, 160 #ifdef CONFIG_AIO 161 mm->ioctx_table, 162 #endif 163 #ifdef CONFIG_MEMCG 164 mm->owner, 165 #endif 166 mm->exe_file, 167 #ifdef CONFIG_MMU_NOTIFIER 168 mm->mmu_notifier_mm, 169 #endif 170 #ifdef CONFIG_NUMA_BALANCING 171 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq, 172 #endif 173 atomic_read(&mm->tlb_flush_pending), 174 mm->def_flags, &mm->def_flags 175 ); 176 } 177 178 #endif /* CONFIG_DEBUG_VM */ 179