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Message-Id: <1358295894-24167-16-git-send-email-cody@linux.vnet.ibm.com>
Date: Tue, 15 Jan 2013 16:24:52 -0800
From: Cody P Schafer <cody@...ux.vnet.ibm.com>
To: Linux MM <linux-mm@...ck.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 15/17] mm/page_alloc: add informative debugging message in page_outside_zone_boundaries()
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@...ux.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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