diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2008-04-17 17:40:45 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 17:40:45 +0200 |
| commit | ee7ae7a1981caaa4a5b14d8c75692a9dccd52105 (patch) | |
| tree | 4ae562c268501ca6b0a1ec19d0aa43809d95581e | |
| parent | 5de253cc5b1f565f7aeb5bacd67bac37e943ceef (diff) | |
x86: add debug info to DEBUG_PAGEALLOC
Add debug information for DEBUG_PAGEALLOC to get some statistics about
the pool usage and split status.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/mm/pageattr.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 7b79f6be4e7..6cdfc0fd68b 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -9,6 +9,8 @@ #include <linux/slab.h> #include <linux/mm.h> #include <linux/interrupt.h> +#include <linux/seq_file.h> +#include <linux/debugfs.h> #include <asm/e820.h> #include <asm/processor.h> @@ -918,6 +920,45 @@ void kernel_map_pages(struct page *page, int numpages, int enable) cpa_fill_pool(NULL); } +#ifdef CONFIG_DEBUG_FS +static int dpa_show(struct seq_file *m, void *v) +{ + seq_puts(m, "DEBUG_PAGEALLOC\n"); + seq_printf(m, "pool_size : %lu\n", pool_size); + seq_printf(m, "pool_pages : %lu\n", pool_pages); + seq_printf(m, "pool_low : %lu\n", pool_low); + seq_printf(m, "pool_used : %lu\n", pool_used); + seq_printf(m, "pool_failed : %lu\n", pool_failed); + + return 0; +} + +static int dpa_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, dpa_show, NULL); +} + +static const struct file_operations dpa_fops = { + .open = dpa_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +int __init debug_pagealloc_proc_init(void) +{ + struct dentry *de; + + de = debugfs_create_file("debug_pagealloc", 0600, NULL, NULL, + &dpa_fops); + if (!de) + return -ENOMEM; + + return 0; +} +__initcall(debug_pagealloc_proc_init); +#endif + #ifdef CONFIG_HIBERNATION bool kernel_page_present(struct page *page) |