linux-kernel - [PATCH] mm: ratelimit PFNs busy info message

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Message-Id: <499c0f6cc10d6eb829a67f2a4d75b4228a9b356e.1501695897.git.jtoppins@redhat.com>
Date:   Wed,  2 Aug 2017 13:44:57 -0400
From:   Jonathan Toppins <jtoppins@...hat.com>
To:     linux-mm@...ck.org
Cc:     linux-rdma@...r.kernel.org, dledford@...hat.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Hillf Danton <hillf.zj@...baba-inc.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] mm: ratelimit PFNs busy info message

The RDMA subsystem can generate several thousand of these messages per
second eventually leading to a kernel crash. Ratelimit these messages
to prevent this crash.

Signed-off-by: Jonathan Toppins <jtoppins@...hat.com>
Reviewed-by: Doug Ledford <dledford@...hat.com>
Tested-by: Doug Ledford <dledford@...hat.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6d30e914afb6..07b7d3060b21 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7666,7 +7666,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
 
 	/* Make sure the range is really isolated. */
 	if (test_pages_isolated(outer_start, end, false)) {
-		pr_info("%s: [%lx, %lx) PFNs busy\n",
+		pr_info_ratelimited("%s: [%lx, %lx) PFNs busy\n",
 			__func__, outer_start, end);
 		ret = -EBUSY;
 		goto done;
-- 
2.10.2