/* * mm/debug.c * * mm/ specific debug routines. * */ #include <linux/kernel.h>#include <linux/mm.h>#include <linux/trace_events.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"	},	{1UL << PG_head,		"head"		},	{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#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)	{1UL << PG_young,		"young"		},	{1UL << PG_idle,		"idle"		},#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",		  page, atomic_read(&page->_count), page_mapcount(page),		  page->mapping, page->index);	if (PageCompound(page))		pr_cont(" compound_mapcount: %d", compound_mapcount(page));	pr_cont("\n");	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_LOCKONFAULT,		"lockonfault"	},	{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 data_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->data_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 */