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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>
This commit is contained in:
Thomas Gleixner 2008-04-17 17:40:45 +02:00 committed by Ingo Molnar
parent 5de253cc5b
commit ee7ae7a198
1 changed files with 41 additions and 0 deletions
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41
arch/x86/mm/pageattr.c
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@ -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)