[mirror_ubuntu-artful-kernel.git] / mm / debug.c

/*
 * 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"	},
#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
#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\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_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 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 */
Commit	Line	Data
31c9afa6 SL	1	/*
	2	* mm/debug.c
	3	*
	4	* mm/ specific debug routines.
	5	*
	6	*/
	7
82742a3a SL	8	#include <linux/kernel.h>
82742a3a SL	9	#include <linux/mm.h>
af658dca	10	#include <linux/trace_events.h>
82742a3a SL	11	#include <linux/memcontrol.h>
	12
	13	static const struct trace_print_flags pageflag_names[] = {
	14	{1UL << PG_locked, "locked" },
	15	{1UL << PG_error, "error" },
	16	{1UL << PG_referenced, "referenced" },
	17	{1UL << PG_uptodate, "uptodate" },
	18	{1UL << PG_dirty, "dirty" },
	19	{1UL << PG_lru, "lru" },
	20	{1UL << PG_active, "active" },
	21	{1UL << PG_slab, "slab" },
	22	{1UL << PG_owner_priv_1, "owner_priv_1" },
	23	{1UL << PG_arch_1, "arch_1" },
	24	{1UL << PG_reserved, "reserved" },
	25	{1UL << PG_private, "private" },
	26	{1UL << PG_private_2, "private_2" },
	27	{1UL << PG_writeback, "writeback" },
	28	#ifdef CONFIG_PAGEFLAGS_EXTENDED
	29	{1UL << PG_head, "head" },
	30	{1UL << PG_tail, "tail" },
	31	#else
	32	{1UL << PG_compound, "compound" },
	33	#endif
	34	{1UL << PG_swapcache, "swapcache" },
	35	{1UL << PG_mappedtodisk, "mappedtodisk" },
	36	{1UL << PG_reclaim, "reclaim" },
	37	{1UL << PG_swapbacked, "swapbacked" },
	38	{1UL << PG_unevictable, "unevictable" },
	39	#ifdef CONFIG_MMU
	40	{1UL << PG_mlocked, "mlocked" },
	41	#endif
	42	#ifdef CONFIG_ARCH_USES_PG_UNCACHED
	43	{1UL << PG_uncached, "uncached" },
	44	#endif
	45	#ifdef CONFIG_MEMORY_FAILURE
	46	{1UL << PG_hwpoison, "hwpoison" },
	47	#endif
	48	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	49	{1UL << PG_compound_lock, "compound_lock" },
	50	#endif
33c3fc71 VD	51	#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
	52	{1UL << PG_young, "young" },
	53	{1UL << PG_idle, "idle" },
	54	#endif
82742a3a SL	55	};
	56
	57	static void dump_flags(unsigned long flags,
	58	const struct trace_print_flags *names, int count)
	59	{
	60	const char *delim = "";
	61	unsigned long mask;
	62	int i;
	63
7a82ca0d	64	pr_emerg("flags: %#lx(", flags);
82742a3a SL	65
	66	/* remove zone id */
	67	flags &= (1UL << NR_PAGEFLAGS) - 1;
	68
	69	for (i = 0; i < count && flags; i++) {
	70
	71	mask = names[i].mask;
	72	if ((flags & mask) != mask)
	73	continue;
	74
	75	flags &= ~mask;
7a82ca0d	76	pr_cont("%s%s", delim, names[i].name);
82742a3a SL	77	delim = "\|";
	78	}
	79
	80	/* check for left over flags */
	81	if (flags)
7a82ca0d	82	pr_cont("%s%#lx", delim, flags);
82742a3a	83
7a82ca0d	84	pr_cont(")\n");
82742a3a SL	85	}
	86
	87	void dump_page_badflags(struct page page, const char reason,
	88	unsigned long badflags)
	89	{
7a82ca0d AM	90	pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
	91	page, atomic_read(&page->_count), page_mapcount(page),
	92	page->mapping, page->index);
82742a3a SL	93	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
	94	dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
	95	if (reason)
	96	pr_alert("page dumped because: %s\n", reason);
	97	if (page->flags & badflags) {
	98	pr_alert("bad because of flags:\n");
	99	dump_flags(page->flags & badflags,
	100	pageflag_names, ARRAY_SIZE(pageflag_names));
	101	}
9edad6ea JW	102	#ifdef CONFIG_MEMCG
	103	if (page->mem_cgroup)
	104	pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
	105	#endif
82742a3a SL	106	}
	107
	108	void dump_page(struct page page, const char reason)
	109	{
	110	dump_page_badflags(page, reason, 0);
	111	}
	112	EXPORT_SYMBOL(dump_page);
	113
	114	#ifdef CONFIG_DEBUG_VM
	115
	116	static const struct trace_print_flags vmaflags_names[] = {
	117	{VM_READ, "read" },
	118	{VM_WRITE, "write" },
	119	{VM_EXEC, "exec" },
	120	{VM_SHARED, "shared" },
	121	{VM_MAYREAD, "mayread" },
	122	{VM_MAYWRITE, "maywrite" },
	123	{VM_MAYEXEC, "mayexec" },
	124	{VM_MAYSHARE, "mayshare" },
	125	{VM_GROWSDOWN, "growsdown" },
	126	{VM_PFNMAP, "pfnmap" },
	127	{VM_DENYWRITE, "denywrite" },
de60f5f1	128	{VM_LOCKONFAULT, "lockonfault" },
82742a3a SL	129	{VM_LOCKED, "locked" },
	130	{VM_IO, "io" },
	131	{VM_SEQ_READ, "seqread" },
	132	{VM_RAND_READ, "randread" },
	133	{VM_DONTCOPY, "dontcopy" },
	134	{VM_DONTEXPAND, "dontexpand" },
	135	{VM_ACCOUNT, "account" },
	136	{VM_NORESERVE, "noreserve" },
	137	{VM_HUGETLB, "hugetlb" },
82742a3a SL	138	#if defined(CONFIG_X86)
	139	{VM_PAT, "pat" },
	140	#elif defined(CONFIG_PPC)
	141	{VM_SAO, "sao" },
	142	#elif defined(CONFIG_PARISC) \|\| defined(CONFIG_METAG) \|\| defined(CONFIG_IA64)
	143	{VM_GROWSUP, "growsup" },
	144	#elif !defined(CONFIG_MMU)
	145	{VM_MAPPED_COPY, "mappedcopy" },
	146	#else
	147	{VM_ARCH_1, "arch_1" },
	148	#endif
	149	{VM_DONTDUMP, "dontdump" },
	150	#ifdef CONFIG_MEM_SOFT_DIRTY
	151	{VM_SOFTDIRTY, "softdirty" },
	152	#endif
	153	{VM_MIXEDMAP, "mixedmap" },
	154	{VM_HUGEPAGE, "hugepage" },
	155	{VM_NOHUGEPAGE, "nohugepage" },
	156	{VM_MERGEABLE, "mergeable" },
	157	};
	158
	159	void dump_vma(const struct vm_area_struct *vma)
	160	{
7a82ca0d	161	pr_emerg("vma %p start %p end %p\n"
82742a3a SL	162	"next %p prev %p mm %p\n"
	163	"prot %lx anon_vma %p vm_ops %p\n"
	164	"pgoff %lx file %p private_data %p\n",
	165	vma, (void )vma->vm_start, (void )vma->vm_end, vma->vm_next,
	166	vma->vm_prev, vma->vm_mm,
	167	(unsigned long)pgprot_val(vma->vm_page_prot),
	168	vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
	169	vma->vm_file, vma->vm_private_data);
	170	dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
	171	}
	172	EXPORT_SYMBOL(dump_vma);
	173
31c9afa6 SL	174	void dump_mm(const struct mm_struct *mm)
31c9afa6 SL	175	{
7a82ca0d	176	pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
31c9afa6 SL	177	#ifdef CONFIG_MMU
	178	"get_unmapped_area %p\n"
	179	#endif
	180	"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
dc6c9a35	181	"pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
31c9afa6 SL	182	"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
	183	"pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n"
	184	"start_code %lx end_code %lx start_data %lx end_data %lx\n"
	185	"start_brk %lx brk %lx start_stack %lx\n"
	186	"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
	187	"binfmt %p flags %lx core_state %p\n"
	188	#ifdef CONFIG_AIO
	189	"ioctx_table %p\n"
	190	#endif
	191	#ifdef CONFIG_MEMCG
	192	"owner %p "
	193	#endif
	194	"exe_file %p\n"
	195	#ifdef CONFIG_MMU_NOTIFIER
	196	"mmu_notifier_mm %p\n"
	197	#endif
	198	#ifdef CONFIG_NUMA_BALANCING
	199	"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
	200	#endif
	201	#if defined(CONFIG_NUMA_BALANCING) \|\| defined(CONFIG_COMPACTION)
	202	"tlb_flush_pending %d\n"
	203	#endif
	204	"%s", /* This is here to hold the comma */
	205
	206	mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
	207	#ifdef CONFIG_MMU
	208	mm->get_unmapped_area,
	209	#endif
	210	mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
	211	mm->pgd, atomic_read(&mm->mm_users),
	212	atomic_read(&mm->mm_count),
	213	atomic_long_read((atomic_long_t *)&mm->nr_ptes),
dc6c9a35	214	mm_nr_pmds((struct mm_struct *)mm),
31c9afa6 SL	215	mm->map_count,
	216	mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
	217	mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm,
	218	mm->start_code, mm->end_code, mm->start_data, mm->end_data,
	219	mm->start_brk, mm->brk, mm->start_stack,
	220	mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
	221	mm->binfmt, mm->flags, mm->core_state,
	222	#ifdef CONFIG_AIO
	223	mm->ioctx_table,
	224	#endif
	225	#ifdef CONFIG_MEMCG
	226	mm->owner,
	227	#endif
	228	mm->exe_file,
	229	#ifdef CONFIG_MMU_NOTIFIER
	230	mm->mmu_notifier_mm,
	231	#endif
	232	#ifdef CONFIG_NUMA_BALANCING
	233	mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
	234	#endif
	235	#if defined(CONFIG_NUMA_BALANCING) \|\| defined(CONFIG_COMPACTION)
	236	mm->tlb_flush_pending,
	237	#endif
	238	"" /* This is here to not have a comma! */
	239	);
	240
	241	dump_flags(mm->def_flags, vmaflags_names,
	242	ARRAY_SIZE(vmaflags_names));
	243	}
	244
82742a3a	245	#endif /* CONFIG_DEBUG_VM */