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mm/page_alloc: add informative debugging message in page_outside_zone_boundaries()

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Add a debug message which prints when a page is found outside of the
boundaries of the zone it should belong to. Format is:
	"page $pfn outside zone [ $start_pfn - $end_pfn ]"

[[email protected]: s/pr_debug/pr_err/]
Signed-off-by: Cody P Schafer <[email protected]>
Cc: David Hansen <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Cody P Schafer 2013-02-22 16:35:28 -08:00 • committed by Linus Torvalds
commit b5e6a5a272
1 changed files with 7 additions and 0 deletions
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7
mm/page_alloc.c
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@ -247,13 +247,20 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
int ret = 0;
unsigned seq;
unsigned long pfn = page_to_pfn(page);
unsigned long sp, start_pfn;
do {
seq = zone_span_seqbegin(zone);
start_pfn = zone->zone_start_pfn;
sp = zone->spanned_pages;
if (!zone_spans_pfn(zone, pfn))
ret = 1;
} while (zone_span_seqretry(zone, seq));
if (ret)
pr_err("page %lu outside zone [ %lu - %lu ]\n",
pfn, start_pfn, start_pfn + sp);
return ret;
}