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linux/virt/kvm
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Christian Borntraeger 56029ce944 KVM: async_pf: do not warn on page allocation failures 
[ Upstream commit d7444794a0 ]

In async_pf we try to allocate with NOWAIT to get an element quickly
or fail. This code also handle failures gracefully. Lets silence
potential page allocation failures under load.

qemu-system-s39: page allocation failure: order:0,mode:0x2200000
[...]
Call Trace:
([<00000000001146b8>] show_trace+0xf8/0x148)
[<000000000011476a>] show_stack+0x62/0xe8
[<00000000004a36b8>] dump_stack+0x70/0x98
[<0000000000272c3a>] warn_alloc_failed+0xd2/0x148
[<000000000027709e>] __alloc_pages_nodemask+0x94e/0xb38
[<00000000002cd36a>] new_slab+0x382/0x400
[<00000000002cf7ac>] ___slab_alloc.constprop.30+0x2dc/0x378
[<00000000002d03d0>] kmem_cache_alloc+0x160/0x1d0
[<0000000000133db4>] kvm_setup_async_pf+0x6c/0x198
[<000000000013dee8>] kvm_arch_vcpu_ioctl_run+0xd48/0xd58
[<000000000012fcaa>] kvm_vcpu_ioctl+0x372/0x690
[<00000000002f66f6>] do_vfs_ioctl+0x3be/0x510
[<00000000002f68ec>] SyS_ioctl+0xa4/0xb8
[<0000000000781c5e>] system_call+0xd6/0x264
[<000003ffa24fa06a>] 0x3ffa24fa06a

Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
History 2016-03-07 16:35:16 -05:00
..
arm KVM: arm/arm64: vgic: Ensure bitmaps are long enough 2016-03-07 16:30:53 -05:00
async_pf.c KVM: async_pf: do not warn on page allocation failures 2016-03-07 16:35:16 -05:00
async_pf.h KVM: Halt vcpu if page it tries to access is swapped out 2011-01-12 11:21:39 +02:00
coalesced_mmio.c KVM: move iodev.h from virt/kvm/ to include/kvm 2015-03-26 21:43:12 +00:00
coalesced_mmio.h KVM: Make coalesced mmio use a device per zone 2011-09-25 19:17:57 +03:00
eventfd.c kvm: fix double free for fast mmio eventfd 2015-10-22 14:43:10 -07:00
irqchip.c KVM: fix checkpatch.pl errors in kvm/irqchip.c 2015-03-10 10:37:42 -03:00
Kconfig KVM: Disable compat ioctl for s390 2015-02-09 12:44:14 +01:00
kvm_main.c kvm: fix zero length mmio searching 2015-10-22 14:43:10 -07:00
vfio.c kvm: vfio: fix unregister kvm_device_ops of vfio 2014-10-24 13:30:47 +02:00
vfio.h kvm: vfio: fix unregister kvm_device_ops of vfio 2014-10-24 13:30:47 +02:00