mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
708614e618
Print out information on how the page flags are being used if mminit_loglevel is MMINIT_VERIFY or higher and unconditionally performs sanity checks on the flags regardless of loglevel. When the page flags are updated with section, node and zone information, a check are made to ensure the values can be retrieved correctly. Finally we confirm that pfn_to_page and page_to_pfn are the correct inverse functions. [akpm@linux-foundation.org: fix printk warnings] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
|
|
* mm_init.c - Memory initialisation verification and debugging
|
|
*
|
|
* Copyright 2008 IBM Corporation, 2008
|
|
* Author Mel Gorman <mel@csn.ul.ie>
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include "internal.h"
|
|
|
|
int __meminitdata mminit_loglevel;
|
|
|
|
void __init mminit_verify_pageflags_layout(void)
|
|
{
|
|
int shift, width;
|
|
unsigned long or_mask, add_mask;
|
|
|
|
shift = 8 * sizeof(unsigned long);
|
|
width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
|
|
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
|
|
"Section %d Node %d Zone %d Flags %d\n",
|
|
SECTIONS_WIDTH,
|
|
NODES_WIDTH,
|
|
ZONES_WIDTH,
|
|
NR_PAGEFLAGS);
|
|
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
|
|
"Section %d Node %d Zone %d\n",
|
|
#ifdef SECTIONS_SHIFT
|
|
SECTIONS_SHIFT,
|
|
#else
|
|
0,
|
|
#endif
|
|
NODES_SHIFT,
|
|
ZONES_SHIFT);
|
|
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
|
|
"Section %lu Node %lu Zone %lu\n",
|
|
(unsigned long)SECTIONS_PGSHIFT,
|
|
(unsigned long)NODES_PGSHIFT,
|
|
(unsigned long)ZONES_PGSHIFT);
|
|
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
|
|
"Zone ID: %lu -> %lu\n",
|
|
(unsigned long)ZONEID_PGOFF,
|
|
(unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
|
|
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
|
|
"location: %d -> %d unused %d -> %d flags %d -> %d\n",
|
|
shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
|
|
#ifdef NODE_NOT_IN_PAGE_FLAGS
|
|
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
|
|
"Node not in page flags");
|
|
#endif
|
|
|
|
if (SECTIONS_WIDTH) {
|
|
shift -= SECTIONS_WIDTH;
|
|
BUG_ON(shift != SECTIONS_PGSHIFT);
|
|
}
|
|
if (NODES_WIDTH) {
|
|
shift -= NODES_WIDTH;
|
|
BUG_ON(shift != NODES_PGSHIFT);
|
|
}
|
|
if (ZONES_WIDTH) {
|
|
shift -= ZONES_WIDTH;
|
|
BUG_ON(shift != ZONES_PGSHIFT);
|
|
}
|
|
|
|
/* Check for bitmask overlaps */
|
|
or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
|
|
(NODES_MASK << NODES_PGSHIFT) |
|
|
(SECTIONS_MASK << SECTIONS_PGSHIFT);
|
|
add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
|
|
(NODES_MASK << NODES_PGSHIFT) +
|
|
(SECTIONS_MASK << SECTIONS_PGSHIFT);
|
|
BUG_ON(or_mask != add_mask);
|
|
}
|
|
|
|
void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
|
|
unsigned long nid, unsigned long pfn)
|
|
{
|
|
BUG_ON(page_to_nid(page) != nid);
|
|
BUG_ON(page_zonenum(page) != zone);
|
|
BUG_ON(page_to_pfn(page) != pfn);
|
|
}
|
|
|
|
static __init int set_mminit_loglevel(char *str)
|
|
{
|
|
get_option(&str, &mminit_loglevel);
|
|
return 0;
|
|
}
|
|
early_param("mminit_loglevel", set_mminit_loglevel);
|