Patch "sched, numa: do not hint for NUMA balancing on VM_MIXEDMAP mappings" has been added to the 4.0-stable tree

This is a note to let you know that I've just added the patch titled

sched, numa: do not hint for NUMA balancing on VM_MIXEDMAP mappings

to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
sched-numa-do-not-hint-for-numa-balancing-on-vm_mixedmap-mappings.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mel Gorman <[email protected]>
Date: Wed, 10 Jun 2015 11:15:00 -0700
Subject: sched, numa: do not hint for NUMA balancing on VM_MIXEDMAP mappings

From: Mel Gorman <[email protected]>

commit 8e76d4eecf7afeec9328e21cd5880e281838d0d6 upstream.

Jovi Zhangwei reported the following problem

Below kernel vm bug can be triggered by tcpdump which mmaped a lot of pages with GFP_COMP flag.

  [Mon May 25 05:29:33 2015] page:ffffea0015414000 count:66 mapcount:1 mapping:          (null) index:0x0
  [Mon May 25 05:29:33 2015] flags: 0x20047580004000(head)
  [Mon May 25 05:29:33 2015] page dumped because: VM_BUG_ON_PAGE(compound_order(page) && !PageTransHuge(page))
  [Mon May 25 05:29:33 2015] ------------[ cut here ]------------
  [Mon May 25 05:29:33 2015] kernel BUG at mm/migrate.c:1661!
  [Mon May 25 05:29:33 2015] invalid opcode: 0000 [#1] SMP

In this case it was triggered by running tcpdump but it's not necessary reproducible on all systems.

sudo tcpdump -i bond0.100 'tcp port 4242' -c 100000000000 -w 4242.pcap

Compound pages cannot be migrated and it was not expected that such pages be marked for NUMA balancing. This did not take into account that drivers such as net/packet/af_packet.c may insert compound pages into userspace with vm_insert_page. This patch tells the NUMA balancing protection scanner to skip all VM_MIXEDMAP mappings which avoids the possibility that compound pages are marked for migration.

---
 kernel/sched/fair.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -2166,7 +2166,7 @@ void task_numa_work(struct callback_head
 	}
 	for (; vma; vma = vma->vm_next) {
 		if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
-			is_vm_hugetlb_page(vma)) {
+			is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) {
 			continue;
 		}
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.0/sched-numa-do-not-hint-for-numa-balancing-on-vm_mixedmap-mappings.patch --
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