The patch titled
Subject: mm: ratelimit PFNs busy info message
has been added to the -mm tree. Its filename is
mm-ratelimit-pfns-busy-info-message.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-ratelimit-pfns-busy-info-message.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-ratelimit-pfns-busy-info-message.patch
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From: Jonathan Toppins <jtoppins@xxxxxxxxxx>
Subject: 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.
Doug said:
: I've been carrying a version of this for several kernel versions. I don't
: remember when they started, but we have one (and only one) class of
: machines: Dell PE R730xd, that generate these errors. When it happens,
: without a rate limit, we get rcu timeouts and kernel oopses. With the
: rate limit, we just get a lot of annoying kernel messages but the machine
: continues on, recovers, and eventually the memory operations all succeed.
Link: http://lkml.kernel.org/r/499c0f6cc10d6eb829a67f2a4d75b4228a9b356e.1501695897.git.jtoppins@xxxxxxxxxx
Signed-off-by: Jonathan Toppins <jtoppins@xxxxxxxxxx>
Reviewed-by: Doug Ledford <dledford@xxxxxxxxxx>
Tested-by: Doug Ledford <dledford@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/page_alloc.c~mm-ratelimit-pfns-busy-info-message mm/page_alloc.c
--- a/mm/page_alloc.c~mm-ratelimit-pfns-busy-info-message
+++ a/mm/page_alloc.c
@@ -7669,7 +7669,7 @@ int alloc_contig_range(unsigned long sta
/* 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;
_
Patches currently in -mm which might be from jtoppins@xxxxxxxxxx are
mm-ratelimit-pfns-busy-info-message.patch
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