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author | Miklos Szeredi <mszeredi@suse.cz> | 2008-04-30 09:54:36 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 17:29:50 +0200 |
commit | 76f1418b485da2707531178e517bbb5cf06b3c76 (patch) | |
tree | 138a012d965ebc284163f42e0ff5786c6de1cda5 /mm/backing-dev.c | |
parent | mm: bdi: allow setting a maximum for the bdi dirty limit (diff) | |
download | linux-76f1418b485da2707531178e517bbb5cf06b3c76.tar.xz linux-76f1418b485da2707531178e517bbb5cf06b3c76.zip |
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.c | 98 |
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 @@ static struct class *bdi_class; +#ifdef CONFIG_DEBUG_FS +#include <linux/debugfs.h> +#include <linux/seq_file.h> + +static struct dentry *bdi_debug_root; + +static void bdi_debug_init(void) +{ + bdi_debug_root = debugfs_create_dir("bdi", NULL); +} + +static int bdi_debug_stats_show(struct seq_file *m, void *v) +{ + struct backing_dev_info *bdi = m->private; + long background_thresh; + long dirty_thresh; + long bdi_thresh; + + get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi); + +#define K(x) ((x) << (PAGE_SHIFT - 10)) + seq_printf(m, + "BdiWriteback: %8lu kB\n" + "BdiReclaimable: %8lu kB\n" + "BdiDirtyThresh: %8lu kB\n" + "DirtyThresh: %8lu kB\n" + "BackgroundThresh: %8lu kB\n", + (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)), + (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)), + K(bdi_thresh), + K(dirty_thresh), + K(background_thresh)); +#undef K + + return 0; +} + +static int bdi_debug_stats_open(struct inode *inode, struct file *file) +{ + return single_open(file, bdi_debug_stats_show, inode->i_private); +} + +static const struct file_operations bdi_debug_stats_fops = { + .open = bdi_debug_stats_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void bdi_debug_register(struct backing_dev_info *bdi, const char *name) +{ + bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root); + bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir, + bdi, &bdi_debug_stats_fops); +} + +static void bdi_debug_unregister(struct backing_dev_info *bdi) +{ + debugfs_remove(bdi->debug_stats); + debugfs_remove(bdi->debug_dir); +} +#else +static inline void bdi_debug_init(void) +{ +} +static inline void bdi_debug_register(struct backing_dev_info *bdi, + const char *name) +{ +} +static inline void bdi_debug_unregister(struct backing_dev_info *bdi) +{ +} +#endif + static ssize_t read_ahead_kb_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) @@ -40,21 +114,6 @@ static ssize_t name##_show(struct device *dev, \ BDI_SHOW(read_ahead_kb, K(bdi->ra_pages)) -BDI_SHOW(reclaimable_kb, K(bdi_stat(bdi, BDI_RECLAIMABLE))) -BDI_SHOW(writeback_kb, K(bdi_stat(bdi, BDI_WRITEBACK))) - -static inline unsigned long get_dirty(struct backing_dev_info *bdi, int i) -{ - unsigned long thresh[3]; - - get_dirty_limits(&thresh[0], &thresh[1], &thresh[2], bdi); - - return thresh[i]; -} - -BDI_SHOW(dirty_kb, K(get_dirty(bdi, 1))) -BDI_SHOW(bdi_dirty_kb, K(get_dirty(bdi, 2))) - static ssize_t min_ratio_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { @@ -95,10 +154,6 @@ BDI_SHOW(max_ratio, bdi->max_ratio) static struct device_attribute bdi_dev_attrs[] = { __ATTR_RW(read_ahead_kb), - __ATTR_RO(reclaimable_kb), - __ATTR_RO(writeback_kb), - __ATTR_RO(dirty_kb), - __ATTR_RO(bdi_dirty_kb), __ATTR_RW(min_ratio), __ATTR_RW(max_ratio), __ATTR_NULL, @@ -108,10 +163,11 @@ static __init int bdi_class_init(void) { bdi_class = class_create(THIS_MODULE, "bdi"); bdi_class->dev_attrs = bdi_dev_attrs; + bdi_debug_init(); return 0; } -core_initcall(bdi_class_init); +postcore_initcall(bdi_class_init); int bdi_register(struct backing_dev_info *bdi, struct device *parent, const char *fmt, ...) @@ -136,6 +192,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent, bdi->dev = dev; dev_set_drvdata(bdi->dev, bdi); + bdi_debug_register(bdi, name); exit: kfree(name); @@ -152,6 +209,7 @@ EXPORT_SYMBOL(bdi_register_dev); void bdi_unregister(struct backing_dev_info *bdi) { if (bdi->dev) { + bdi_debug_unregister(bdi); device_unregister(bdi->dev); bdi->dev = NULL; } |