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 print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32, 63 sizeof(unsigned long), page, 64 sizeof(struct page), false); 65 66 if (reason) 67 pr_alert("page dumped because: %s\n", reason); 68 69 #ifdef CONFIG_MEMCG 70 if (page->mem_cgroup) 71 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup); 72 #endif 73 } 74 75 void dump_page(struct page *page, const char *reason) 76 { 77 __dump_page(page, reason); 78 dump_page_owner(page); 79 } 80 EXPORT_SYMBOL(dump_page); 81 82 #ifdef CONFIG_DEBUG_VM 83 84 void dump_vma(const struct vm_area_struct *vma) 85 { 86 pr_emerg("vma %p start %p end %p\n" 87 "next %p prev %p mm %p\n" 88 "prot %lx anon_vma %p vm_ops %p\n" 89 "pgoff %lx file %p private_data %p\n" 90 "flags: %#lx(%pGv)\n", 91 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next, 92 vma->vm_prev, vma->vm_mm, 93 (unsigned long)pgprot_val(vma->vm_page_prot), 94 vma->anon_vma, vma->vm_ops, vma->vm_pgoff, 95 vma->vm_file, vma->vm_private_data, 96 vma->vm_flags, &vma->vm_flags); 97 } 98 EXPORT_SYMBOL(dump_vma); 99 100 void dump_mm(const struct mm_struct *mm) 101 { 102 pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n" 103 #ifdef CONFIG_MMU 104 "get_unmapped_area %p\n" 105 #endif 106 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n" 107 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n" 108 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n" 109 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n" 110 "start_code %lx end_code %lx start_data %lx end_data %lx\n" 111 "start_brk %lx brk %lx start_stack %lx\n" 112 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n" 113 "binfmt %p flags %lx core_state %p\n" 114 #ifdef CONFIG_AIO 115 "ioctx_table %p\n" 116 #endif 117 #ifdef CONFIG_MEMCG 118 "owner %p " 119 #endif 120 "exe_file %p\n" 121 #ifdef CONFIG_MMU_NOTIFIER 122 "mmu_notifier_mm %p\n" 123 #endif 124 #ifdef CONFIG_NUMA_BALANCING 125 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n" 126 #endif 127 "tlb_flush_pending %d\n" 128 "def_flags: %#lx(%pGv)\n", 129 130 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size, 131 #ifdef CONFIG_MMU 132 mm->get_unmapped_area, 133 #endif 134 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end, 135 mm->pgd, atomic_read(&mm->mm_users), 136 atomic_read(&mm->mm_count), 137 atomic_long_read((atomic_long_t *)&mm->nr_ptes), 138 mm_nr_pmds((struct mm_struct *)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