/* * mm/debug.c * * mm/ specific debug routines. * */ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/ftrace_event.h> #include <linux/memcontrol.h> static const struct trace_print_flags pageflag_names[] = { {1UL << PG_locked, "locked" }, {1UL << PG_error, "error" }, {1UL << PG_referenced, "referenced" }, {1UL << PG_uptodate, "uptodate" }, {1UL << PG_dirty, "dirty" }, {1UL << PG_lru, "lru" }, {1UL << PG_active, "active" }, {1UL << PG_slab, "slab" }, {1UL << PG_owner_priv_1, "owner_priv_1" }, {1UL << PG_arch_1, "arch_1" }, {1UL << PG_reserved, "reserved" }, {1UL << PG_private, "private" }, {1UL << PG_private_2, "private_2" }, {1UL << PG_writeback, "writeback" }, #ifdef CONFIG_PAGEFLAGS_EXTENDED {1UL << PG_head, "head" }, {1UL << PG_tail, "tail" }, #else {1UL << PG_compound, "compound" }, #endif {1UL << PG_swapcache, "swapcache" }, {1UL << PG_mappedtodisk, "mappedtodisk" }, {1UL << PG_reclaim, "reclaim" }, {1UL << PG_swapbacked, "swapbacked" }, {1UL << PG_unevictable, "unevictable" }, #ifdef CONFIG_MMU {1UL << PG_mlocked, "mlocked" }, #endif #ifdef CONFIG_ARCH_USES_PG_UNCACHED {1UL << PG_uncached, "uncached" }, #endif #ifdef CONFIG_MEMORY_FAILURE {1UL << PG_hwpoison, "hwpoison" }, #endif #ifdef CONFIG_TRANSPARENT_HUGEPAGE {1UL << PG_compound_lock, "compound_lock" }, #endif }; static void dump_flags(unsigned long flags, const struct trace_print_flags *names, int count) { const char *delim = ""; unsigned long mask; int i; pr_emerg("flags: %#lx(", flags); /* remove zone id */ flags &= (1UL << NR_PAGEFLAGS) - 1; for (i = 0; i < count && flags; i++) { mask = names[i].mask; if ((flags & mask) != mask) continue; flags &= ~mask; pr_cont("%s%s", delim, names[i].name); delim = "|"; } /* check for left over flags */ if (flags) pr_cont("%s%#lx", delim, flags); pr_cont(")\n"); } void dump_page_badflags(struct page *page, const char *reason, unsigned long badflags) { pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n", page, atomic_read(&page->_count), page_mapcount(page), page->mapping, page->index); BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS); dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names)); if (reason) pr_alert("page dumped because: %s\n", reason); if (page->flags & badflags) { pr_alert("bad because of flags:\n"); dump_flags(page->flags & badflags, pageflag_names, ARRAY_SIZE(pageflag_names)); } #ifdef CONFIG_MEMCG if (page->mem_cgroup) pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup); #endif } void dump_page(struct page *page, const char *reason) { dump_page_badflags(page, reason, 0); } EXPORT_SYMBOL(dump_page); #ifdef CONFIG_DEBUG_VM static const struct trace_print_flags vmaflags_names[] = { {VM_READ, "read" }, {VM_WRITE, "write" }, {VM_EXEC, "exec" }, {VM_SHARED, "shared" }, {VM_MAYREAD, "mayread" }, {VM_MAYWRITE, "maywrite" }, {VM_MAYEXEC, "mayexec" }, {VM_MAYSHARE, "mayshare" }, {VM_GROWSDOWN, "growsdown" }, {VM_PFNMAP, "pfnmap" }, {VM_DENYWRITE, "denywrite" }, {VM_LOCKED, "locked" }, {VM_IO, "io" }, {VM_SEQ_READ, "seqread" }, {VM_RAND_READ, "randread" }, {VM_DONTCOPY, "dontcopy" }, {VM_DONTEXPAND, "dontexpand" }, {VM_ACCOUNT, "account" }, {VM_NORESERVE, "noreserve" }, {VM_HUGETLB, "hugetlb" }, #if defined(CONFIG_X86) {VM_PAT, "pat" }, #elif defined(CONFIG_PPC) {VM_SAO, "sao" }, #elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64) {VM_GROWSUP, "growsup" }, #elif !defined(CONFIG_MMU) {VM_MAPPED_COPY, "mappedcopy" }, #else {VM_ARCH_1, "arch_1" }, #endif {VM_DONTDUMP, "dontdump" }, #ifdef CONFIG_MEM_SOFT_DIRTY {VM_SOFTDIRTY, "softdirty" }, #endif {VM_MIXEDMAP, "mixedmap" }, {VM_HUGEPAGE, "hugepage" }, {VM_NOHUGEPAGE, "nohugepage" }, {VM_MERGEABLE, "mergeable" }, }; void dump_vma(const struct vm_area_struct *vma) { pr_emerg("vma %p start %p end %p\n" "next %p prev %p mm %p\n" "prot %lx anon_vma %p vm_ops %p\n" "pgoff %lx file %p private_data %p\n", vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next, vma->vm_prev, vma->vm_mm, (unsigned long)pgprot_val(vma->vm_page_prot), vma->anon_vma, vma->vm_ops, vma->vm_pgoff, vma->vm_file, vma->vm_private_data); dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names)); } EXPORT_SYMBOL(dump_vma); void dump_mm(const struct mm_struct *mm) { pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n" #ifdef CONFIG_MMU "get_unmapped_area %p\n" #endif "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n" "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n" "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n" "pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n" "start_code %lx end_code %lx start_data %lx end_data %lx\n" "start_brk %lx brk %lx start_stack %lx\n" "arg_start %lx arg_end %lx env_start %lx env_end %lx\n" "binfmt %p flags %lx core_state %p\n" #ifdef CONFIG_AIO "ioctx_table %p\n" #endif #ifdef CONFIG_MEMCG "owner %p " #endif "exe_file %p\n" #ifdef CONFIG_MMU_NOTIFIER "mmu_notifier_mm %p\n" #endif #ifdef CONFIG_NUMA_BALANCING "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n" #endif #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION) "tlb_flush_pending %d\n" #endif "%s", /* This is here to hold the comma */ mm, mm->mmap, mm->vmacache_seqnum, mm->task_size, #ifdef CONFIG_MMU mm->get_unmapped_area, #endif mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end, mm->pgd, atomic_read(&mm->mm_users), atomic_read(&mm->mm_count), atomic_long_read((atomic_long_t *)&mm->nr_ptes), mm_nr_pmds((struct mm_struct *)mm), mm->map_count, mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm, mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm, mm->start_code, mm->end_code, mm->start_data, mm->end_data, mm->start_brk, mm->brk, mm->start_stack, mm->arg_start, mm->arg_end, mm->env_start, mm->env_end, mm->binfmt, mm->flags, mm->core_state, #ifdef CONFIG_AIO mm->ioctx_table, #endif #ifdef CONFIG_MEMCG mm->owner, #endif mm->exe_file, #ifdef CONFIG_MMU_NOTIFIER mm->mmu_notifier_mm, #endif #ifdef CONFIG_NUMA_BALANCING mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq, #endif #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION) mm->tlb_flush_pending, #endif "" /* This is here to not have a comma! */ ); dump_flags(mm->def_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names)); } #endif /* CONFIG_DEBUG_VM */