The patch titled
mm: suppress pfn range output for zones without pages
has been added to the -mm tree. Its filename is
mm-suppress-pfn-range-output-for-zones-without-pages.patch
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------------------------------------------------------
Subject: mm: suppress pfn range output for zones without pages
From: David Rientjes <rientjes@xxxxxxxxxx>
free_area_init_nodes() emits pfn ranges for all zones on the system.
There may be no pages on a higher zone, however, due to memory limitations
or the use of the mem= kernel parameter. For example:
Zone PFN ranges:
DMA 0x00000001 -> 0x00001000
DMA32 0x00001000 -> 0x00100000
Normal 0x00100000 -> 0x00100000
The implementation copies the previous zone's highest pfn, if any, as the
next zone's lowest pfn. If its highest pfn is then greater than the
amount of addressable memory, the upper memory limit is used instead.
Thus, both the lowest and highest possible pfn for higher zones without
memory may be the same.
The pfn range for zones without memory is now shown as "empty" instead.
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff -puN mm/page_alloc.c~mm-suppress-pfn-range-output-for-zones-without-pages mm/page_alloc.c
--- a/mm/page_alloc.c~mm-suppress-pfn-range-output-for-zones-without-pages
+++ a/mm/page_alloc.c
@@ -4356,8 +4356,12 @@ void __init free_area_init_nodes(unsigne
for (i = 0; i < MAX_NR_ZONES; i++) {
if (i == ZONE_MOVABLE)
continue;
- printk(" %-8s %0#10lx -> %0#10lx\n",
- zone_names[i],
+ printk(" %-8s ", zone_names[i]);
+ if (arch_zone_lowest_possible_pfn[i] ==
+ arch_zone_highest_possible_pfn[i])
+ printk("empty\n");
+ else
+ printk("%0#10lx -> %0#10lx\n",
arch_zone_lowest_possible_pfn[i],
arch_zone_highest_possible_pfn[i]);
}
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
linux-next.patch
mm-clean-up-mm_counter.patch
mm-avoid-false-sharing-of-mm_counter.patch
mm-count-swap-usage.patch
mm-count-swap-usage-checkpatch-fixes.patch
mm-restore-zone-all_unreclaimable-to-independence-word.patch
mm-restore-zone-all_unreclaimable-to-independence-word-fix.patch
mm-restore-zone-all_unreclaimable-to-independence-word-fix-2.patch
mm-suppress-pfn-range-output-for-zones-without-pages.patch
nodemaskh-remove-macro-any_online_node.patch
sysctl-clean-up-vm-related-variable-declarations.patch
sysctl-clean-up-vm-related-variable-declarations-fix.patch
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