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

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

arch/x86/mm/pageattr.c

+41 −0
Original line number Diff line number Diff line
@@ -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)