summaryrefslogtreecommitdiffstats
path: root/mm/debug.c
blob: 697df9050193987a179fe27b141e4a36921f314e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
#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;

	printk(KERN_ALERT "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;
		printk("%s%s", delim, names[i].name);
		delim = "|";
	}

	/* check for left over flags */
	if (flags)
		printk("%s%#lx", delim, flags);

	printk(")\n");
}

void dump_page_badflags(struct page *page, const char *reason,
		unsigned long badflags)
{
	printk(KERN_ALERT
	       "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));
	}
	mem_cgroup_print_bad_page(page);
}

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"	},
	{VM_NONLINEAR,			"nonlinear"	},
#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)
{
	printk(KERN_ALERT
		"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);

#endif		/* CONFIG_DEBUG_VM */