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authorThomas Gleixner <tglx@linutronix.de>2008-04-17 17:40:45 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:40:45 +0200
commitee7ae7a1981caaa4a5b14d8c75692a9dccd52105 (patch)
tree4ae562c268501ca6b0a1ec19d0aa43809d95581e /arch
parent5de253cc5b1f565f7aeb5bacd67bac37e943ceef (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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/mm/pageattr.c41
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)