Hi,
I've been regularly seeing on the 3.10 stable kernels the same problem
as reported by Romain Francoise here:
https://lkml.org/lkml/2013/1/23/492
An example from my setup is at the bottom of this mail. It's a problem
as qemu fails to run when it hits this, only solution is to do all qemu
launches with vhost=off after it happens. It starts happening after the
machine has been running for a while and after a few VMs have been
started. I guess that is the fragmentation issue as the machine is never
under any serious memory pressure when it happens.
I see this set of changes for 3.16 has a couple of fixes which appear to
address the problem:
https://lkml.org/lkml/2014/6/11/302
I was just wondering if there are any plans to backport these to 3.10,
or even if it is actually possible (I'm not a kernel dev so wouldn't know)?
If not, are there any other workarounds other than vhost=off?
thanks,
Eddie
[1948751.794040] qemu-system-x86: page allocation failure: order:4,
mode:0x1040d0
[1948751.810341] CPU: 4 PID: 41198 Comm: qemu-system-x86 Not tainted
3.10.53-rc1 #3
[1948751.826846] Hardware name: Intel Corporation S1200BTL/S1200BTL,
BIOS S1200BT.86B.02.00.0041.120520121743 12/05/2012
[1948751.847285] 0000000000000004 ffff8802eaf3b9d8 ffffffff8162ff4d
ffff8802eaf3ba68
[1948751.864257] ffffffff810ab771 0000000000000001 ffff8802eaf3bb48
ffff8802eaf3ba68
[1948751.881209] ffffffff810abe68 ffffffff81ca2f40 ffffffff00000000
0000000200000040
[1948751.898276] Call Trace:
[1948751.909628] [<ffffffff8162ff4d>] dump_stack+0x19/0x1c
[1948751.924284] [<ffffffff810ab771>] warn_alloc_failed+0x111/0x126
[1948751.939774] [<ffffffff810abe68>] ?
__alloc_pages_direct_compact+0x181/0x198
[1948751.956650] [<ffffffff810ac5ae>] __alloc_pages_nodemask+0x72f/0x77c
[1948751.972853] [<ffffffff810ac676>] __get_free_pages+0x12/0x41
[1948751.988297] [<ffffffffa04ac71b>] vhost_net_open+0x23/0x171 [vhost_net]
[1948752.004938] [<ffffffff8130d6c3>] misc_open+0x119/0x17d
[1948752.020111] [<ffffffff810e99b4>] chrdev_open+0x134/0x155
[1948752.035604] [<ffffffff81053193>] ? lg_local_unlock+0x1e/0x31
[1948752.051436] [<ffffffff810e9880>] ? cdev_put+0x24/0x24
[1948752.066540] [<ffffffff810e46b8>] do_dentry_open+0x15c/0x20f
[1948752.082214] [<ffffffff810e484b>] finish_open+0x34/0x3f
[1948752.097234] [<ffffffff810f2737>] do_last+0x996/0xbcb
[1948752.111983] [<ffffffff810ef98e>] ? link_path_walk+0x5e/0x791
[1948752.127447] [<ffffffff810f0296>] ? path_init+0x11d/0x403
[1948752.142517] [<ffffffff810f2a32>] path_openat+0xc6/0x43b
[1948752.157207] [<ffffffff81070f08>] ? __lock_acquire+0x9ae/0xa4a
[1948752.172369] [<ffffffff815ac2ef>] ? rtnl_unlock+0x9/0xb
[1948752.186893] [<ffffffff810f2eac>] do_filp_open+0x38/0x84
[1948752.201503] [<ffffffff81633673>] ? _raw_spin_unlock+0x26/0x2a
[1948752.216719] [<ffffffff810fdfef>] ? __alloc_fd+0xf6/0x10a
[1948752.231521] [<ffffffff810e437c>] do_sys_open+0x114/0x1a6
[1948752.246396] [<ffffffff810e4438>] SyS_open+0x19/0x1b
[1948752.260709] [<ffffffff816341d2>] system_call_fastpath+0x16/0x1b
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