Commit ee7ae7a1 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar

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: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 5de253cc
...@@ -9,6 +9,8 @@ ...@@ -9,6 +9,8 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <asm/e820.h> #include <asm/e820.h>
#include <asm/processor.h> #include <asm/processor.h>
...@@ -918,6 +920,45 @@ void kernel_map_pages(struct page *page, int numpages, int enable) ...@@ -918,6 +920,45 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
cpa_fill_pool(NULL); 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 #ifdef CONFIG_HIBERNATION
bool kernel_page_present(struct page *page) bool kernel_page_present(struct page *page)
......
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