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authorMiklos Szeredi <mszeredi@suse.cz>2008-04-30 03:54:36 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 11:29:50 -0400
commit76f1418b485da2707531178e517bbb5cf06b3c76 (patch)
tree138a012d965ebc284163f42e0ff5786c6de1cda5 /mm/backing-dev.c
parenta42dde04152750426cc620fd277e80fffae2f65a (diff)
mm: bdi: move statistics to debugfs
Move BDI statistics to debugfs: /sys/kernel/debug/bdi/<bdi>/stats Use postcore_initcall() to initialize the sysfs class and debugfs, because debugfs is initialized in core_initcall(). Update descriptions in ABI documentation. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c98
1 files changed, 78 insertions, 20 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 08361b6aad50..7c4f9e097095 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -10,6 +10,80 @@
10 10
11static struct class *bdi_class; 11static struct class *bdi_class;
12 12
13#ifdef CONFIG_DEBUG_FS
14#include <linux/debugfs.h>
15#include <linux/seq_file.h>
16
17static struct dentry *bdi_debug_root;
18
19static void bdi_debug_init(void)
20{
21 bdi_debug_root = debugfs_create_dir("bdi", NULL);
22}
23
24static int bdi_debug_stats_show(struct seq_file *m, void *v)
25{
26 struct backing_dev_info *bdi = m->private;
27 long background_thresh;
28 long dirty_thresh;
29 long bdi_thresh;
30
31 get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi);
32
33#define K(x) ((x) << (PAGE_SHIFT - 10))
34 seq_printf(m,
35 "BdiWriteback: %8lu kB\n"
36 "BdiReclaimable: %8lu kB\n"
37 "BdiDirtyThresh: %8lu kB\n"
38 "DirtyThresh: %8lu kB\n"
39 "BackgroundThresh: %8lu kB\n",
40 (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
41 (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
42 K(bdi_thresh),
43 K(dirty_thresh),
44 K(background_thresh));
45#undef K
46
47 return 0;
48}
49
50static int bdi_debug_stats_open(struct inode *inode, struct file *file)
51{
52 return single_open(file, bdi_debug_stats_show, inode->i_private);
53}
54
55static const struct file_operations bdi_debug_stats_fops = {
56 .open = bdi_debug_stats_open,
57 .read = seq_read,
58 .llseek = seq_lseek,
59 .release = single_release,
60};
61
62static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)
63{
64 bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
65 bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir,
66 bdi, &bdi_debug_stats_fops);
67}
68
69static void bdi_debug_unregister(struct backing_dev_info *bdi)
70{
71 debugfs_remove(bdi->debug_stats);
72 debugfs_remove(bdi->debug_dir);
73}
74#else
75static inline void bdi_debug_init(void)
76{
77}
78static inline void bdi_debug_register(struct backing_dev_info *bdi,
79 const char *name)
80{
81}
82static inline void bdi_debug_unregister(struct backing_dev_info *bdi)
83{
84}
85#endif
86
13static ssize_t read_ahead_kb_store(struct device *dev, 87static ssize_t read_ahead_kb_store(struct device *dev,
14 struct device_attribute *attr, 88 struct device_attribute *attr,
15 const char *buf, size_t count) 89 const char *buf, size_t count)
@@ -40,21 +114,6 @@ static ssize_t name##_show(struct device *dev, \
40 114
41BDI_SHOW(read_ahead_kb, K(bdi->ra_pages)) 115BDI_SHOW(read_ahead_kb, K(bdi->ra_pages))
42 116
43BDI_SHOW(reclaimable_kb, K(bdi_stat(bdi, BDI_RECLAIMABLE)))
44BDI_SHOW(writeback_kb, K(bdi_stat(bdi, BDI_WRITEBACK)))
45
46static inline unsigned long get_dirty(struct backing_dev_info *bdi, int i)
47{
48 unsigned long thresh[3];
49
50 get_dirty_limits(&thresh[0], &thresh[1], &thresh[2], bdi);
51
52 return thresh[i];
53}
54
55BDI_SHOW(dirty_kb, K(get_dirty(bdi, 1)))
56BDI_SHOW(bdi_dirty_kb, K(get_dirty(bdi, 2)))
57
58static ssize_t min_ratio_store(struct device *dev, 117static ssize_t min_ratio_store(struct device *dev,
59 struct device_attribute *attr, const char *buf, size_t count) 118 struct device_attribute *attr, const char *buf, size_t count)
60{ 119{
@@ -95,10 +154,6 @@ BDI_SHOW(max_ratio, bdi->max_ratio)
95 154
96static struct device_attribute bdi_dev_attrs[] = { 155static struct device_attribute bdi_dev_attrs[] = {
97 __ATTR_RW(read_ahead_kb), 156 __ATTR_RW(read_ahead_kb),
98 __ATTR_RO(reclaimable_kb),
99 __ATTR_RO(writeback_kb),
100 __ATTR_RO(dirty_kb),
101 __ATTR_RO(bdi_dirty_kb),
102 __ATTR_RW(min_ratio), 157 __ATTR_RW(min_ratio),
103 __ATTR_RW(max_ratio), 158 __ATTR_RW(max_ratio),
104 __ATTR_NULL, 159 __ATTR_NULL,
@@ -108,10 +163,11 @@ static __init int bdi_class_init(void)
108{ 163{
109 bdi_class = class_create(THIS_MODULE, "bdi"); 164 bdi_class = class_create(THIS_MODULE, "bdi");
110 bdi_class->dev_attrs = bdi_dev_attrs; 165 bdi_class->dev_attrs = bdi_dev_attrs;
166 bdi_debug_init();
111 return 0; 167 return 0;
112} 168}
113 169
114core_initcall(bdi_class_init); 170postcore_initcall(bdi_class_init);
115 171
116int bdi_register(struct backing_dev_info *bdi, struct device *parent, 172int bdi_register(struct backing_dev_info *bdi, struct device *parent,
117 const char *fmt, ...) 173 const char *fmt, ...)
@@ -136,6 +192,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
136 192
137 bdi->dev = dev; 193 bdi->dev = dev;
138 dev_set_drvdata(bdi->dev, bdi); 194 dev_set_drvdata(bdi->dev, bdi);
195 bdi_debug_register(bdi, name);
139 196
140exit: 197exit:
141 kfree(name); 198 kfree(name);
@@ -152,6 +209,7 @@ EXPORT_SYMBOL(bdi_register_dev);
152void bdi_unregister(struct backing_dev_info *bdi) 209void bdi_unregister(struct backing_dev_info *bdi)
153{ 210{
154 if (bdi->dev) { 211 if (bdi->dev) {
212 bdi_debug_unregister(bdi);
155 device_unregister(bdi->dev); 213 device_unregister(bdi->dev);
156 bdi->dev = NULL; 214 bdi->dev = NULL;
157 } 215 }