Messages in this thread Patch in this message |  | | From | Cody P Schafer <> | Subject | [PATCH 6/9] mm/page_alloc: add informative debugging message in page_outside_zone_boundaries() | Date | Thu, 17 Jan 2013 14:52:58 -0800 |
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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 ]"
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> --- mm/page_alloc.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f8ed277..f1783cf 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -239,13 +239,20 @@ 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_debug("page %lu outside zone [ %lu - %lu ]\n", + pfn, start_pfn, start_pfn + sp); + return ret; } -- 1.8.0.3
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