linux-kernel - [PATCH 10/14] mm, vmstat: skip reporting offline pages in pagetypeinfo

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Date:   Mon, 15 May 2017 10:58:23 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, Mel Gorman <mgorman@...e.de>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        qiuxishi@...wei.com, Kani Toshimitsu <toshi.kani@....com>,
        slaoub@...il.com, Joonsoo Kim <js1304@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH 10/14] mm, vmstat: skip reporting offline pages in pagetypeinfo

From: Michal Hocko <mhocko@...e.com>

pagetypeinfo_showblockcount_print skips over invalid pfns but it would
report pages which are offline because those have a valid pfn. Their
migrate type is misleading at best. Now that we have pfn_to_online_page()
we can use it instead of pfn_valid() and fix this.

Noticed-by: Joonsoo Kim <js1304@...il.com>
Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 mm/vmstat.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 571d3ec05566..c432e581f9a9 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1223,11 +1223,9 @@ static void pagetypeinfo_showblockcount_print(struct seq_file *m,
 	for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
 		struct page *page;
 
-		if (!pfn_valid(pfn))
+		if (!pfn_to_online_page(pfn))
 			continue;
 
-		page = pfn_to_page(pfn);
-
 		/* Watch for unexpected holes punched in the memmap */
 		if (!memmap_valid_within(pfn, page, zone))
 			continue;
-- 
2.11.0