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authorMel Gorman <mgorman@suse.de>2013-02-22 16:34:47 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:18 -0800
commita4e1b4c6c6db7b7d1ca7f399b4e08aa381f23899 (patch)
tree5546e920bdf0c88aa1b838b5e12a95fc90b59efa /mm/mm_init.c
parent4468b8f1e2d32ce79ef4bcb8e00d7e88627f1c3a (diff)
downloadlinux-a4e1b4c6c6db7b7d1ca7f399b4e08aa381f23899.tar.gz
mm: init: report on last-nid information stored in page->flags
Answering the question "how much space remains in the page->flags" is time-consuming. mminit_loglevel can help answer the question but it does not take last_nid information into account. This patch corrects it and while there it corrects the messages related to page flag usage, pgshifts and node/zone id. When applied the relevant output looks something like this but will depend on the kernel configuration. mminit::pageflags_layout_widths Section 0 Node 9 Zone 2 Lastnid 9 Flags 25 mminit::pageflags_layout_shifts Section 19 Node 9 Zone 2 Lastnid 9 mminit::pageflags_layout_pgshifts Section 0 Node 55 Zone 53 Lastnid 44 mminit::pageflags_layout_nodezoneid Node/Zone ID: 64 -> 53 mminit::pageflags_layout_usage location: 64 -> 44 layout 44 -> 25 unused 25 -> 0 page-flags Signed-off-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mm_init.c')
-rw-r--r--mm/mm_init.c31
1 files changed, 19 insertions, 12 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 1ffd97ae26d..c280a02ea11 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -69,34 +69,41 @@ void __init mminit_verify_pageflags_layout(void)
unsigned long or_mask, add_mask;
shift = 8 * sizeof(unsigned long);
- width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
+ width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_NID_SHIFT;
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
- "Section %d Node %d Zone %d Flags %d\n",
+ "Section %d Node %d Zone %d Lastnid %d Flags %d\n",
SECTIONS_WIDTH,
NODES_WIDTH,
ZONES_WIDTH,
+ LAST_NID_WIDTH,
NR_PAGEFLAGS);
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
- "Section %d Node %d Zone %d\n",
+ "Section %d Node %d Zone %d Lastnid %d\n",
SECTIONS_SHIFT,
NODES_SHIFT,
- ZONES_SHIFT);
- mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
- "Section %lu Node %lu Zone %lu\n",
+ ZONES_SHIFT,
+ LAST_NID_SHIFT);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
+ "Section %lu Node %lu Zone %lu Lastnid %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));
+ (unsigned long)ZONES_PGSHIFT,
+ (unsigned long)LAST_NID_PGSHIFT);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
+ "Node/Zone ID: %lu -> %lu\n",
+ (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
+ (unsigned long)ZONEID_PGOFF);
mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
- "location: %d -> %d unused %d -> %d flags %d -> %d\n",
+ "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\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
+#ifdef LAST_NID_NOT_IN_PAGE_FLAGS
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
+ "Last nid not in page flags");
+#endif
if (SECTIONS_WIDTH) {
shift -= SECTIONS_WIDTH;