qemu/hw
Denis V. Lunev e3816255bf balloon: add a feature bit to let Guest OS deflate balloon on oom
Excessive virtio_balloon inflation can cause invocation of OOM-killer,
when Linux is under severe memory pressure. Various mechanisms are
responsible for correct virtio_balloon memory management. Nevertheless it
is often the case that these control tools does not have enough time to
react on fast changing memory load. As a result OS runs out of memory and
invokes OOM-killer. The balancing of memory by use of the virtio balloon
should not cause the termination of processes while there are pages in the
balloon. Now there is no way for virtio balloon driver to free memory at
the last moment before some process get killed by OOM-killer.

This does not provide a security breach as balloon itself is running
inside Guest OS and is working in the cooperation with the host. Thus
some improvements from Guest side should be considered as normal.

To solve the problem, introduce a virtio_balloon callback which is
expected to be called from the oom notifier call chain in out_of_memory()
function. If virtio balloon could release some memory, it will make the
system return and retry the allocation that forced the out of memory
killer to run.

This behavior should be enabled if and only if appropriate feature bit
is set on the device. It is off by default.

This functionality was recently merged into vanilla Linux.

  commit 5a10b7dbf904bfe01bb9fcc6298f7df09eed77d5
  Author: Raushaniya Maksudova <rmaksudova@parallels.com>
  Date:   Mon Nov 10 09:36:29 2014 +1030

This patch adds respective control bits into QEMU. It introduces
deflate-on-oom option for balloon device which does the trick.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Raushaniya Maksudova <rmaksudova@parallels.com>
CC: Anthony Liguori <aliguori@amazon.com>
CC: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Acked-by: James Bottomley <JBottomley@Odin.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
2015-06-23 17:08:21 +02:00
..
9pfs virtio-9p-device: move qdev properties into virtio-9p-device.c 2015-06-10 18:15:34 +02:00
acpi migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
alpha hw/alpha/typhoon.c: Fix misusing qemu_allocate_irqs for single irq 2015-06-03 14:21:24 +03:00
arm arm: xlnx-zynqmp: Add 2xCortexR5 CPUs 2015-06-19 14:17:45 +01:00
audio gus: clean up MemoryRegionPortio 2015-04-27 18:24:18 +02:00
block migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
bt bt-sdp: fix broken uuids power-of-2 calculation 2015-04-28 15:36:08 +02:00
char migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
core qdev: fix OVERFLOW_BEFORE_WIDEN 2015-06-23 08:14:13 +02:00
cpu icc_bus: fix typo ICC_BRIGDE -> ICC_BRIDGE 2014-11-03 19:51:56 +03:00
cris cris: memory: Replace memory_region_init_ram with memory_region_allocate_system_memory 2015-04-11 20:03:57 +10:00
display virtio-gpu: pci support bits and virtio-vga. 2015-06-16 10:35:43 +01:00
dma dma/rc4030: convert to QOM 2015-06-11 10:13:29 +01:00
gpio pl061: fix wrong calculation of GPIOMIS register 2015-06-02 14:56:25 +01:00
i2c ACPI: split CONFIG_ACPI into 4 pieces 2015-05-29 11:28:59 +01:00
i386 q35: Re-enable FDC on pc-q35-2.3 and older 2015-06-19 09:40:35 +01:00
ide migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
input migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
intc arm_gic: gic_update should always update all cores 2015-06-15 18:06:07 +01:00
ipack pci: Trivial device model conversions to realize 2015-02-26 12:42:16 +01:00
isa virtio-gpu: pci support bits and virtio-vga. 2015-06-16 10:35:43 +01:00
lm32 hw/lm32/milkymist.c: Fix misusing qemu_allocate_irqs for single irq 2015-06-03 14:21:24 +03:00
m68k m68k: implement more ColdFire 5208 interrupt controller functionality 2015-06-22 14:43:25 +01:00
mem pc-dimm: don't assert if pc-dimm alignment != hotpluggable mem range size 2015-06-04 11:20:34 +02:00
microblaze s3adsp1800: Remove the hardcoded values from the reset 2015-06-21 17:20:16 +10:00
mips net/dp8393x: add PROM to store MAC address 2015-06-11 10:13:30 +01:00
misc virtio, pci fixes, enhancements 2015-06-19 11:30:57 +01:00
moxie memory: add parameter errp to memory_region_init_ram 2014-09-09 13:41:43 +02:00
net virtio, pci fixes, enhancements 2015-06-19 11:30:57 +01:00
nvram fw_cfg: prohibit insertion of duplicate fw_cfg file names 2015-06-10 08:00:37 +02:00
openrisc hw/core/loader: implement address translation in uimage loader 2014-11-03 00:59:10 +03:00
pci virtio-vga: add '-vga virtio' support 2015-06-12 10:13:23 +02:00
pci-bridge hw/pxb: add numa_node parameter 2015-06-03 18:19:18 +02:00
pci-host migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
pcmcia hmp: Remove "info pcmcia" 2014-10-24 12:19:11 +01:00
ppc fw_cfg: fix FW_CFG_BOOT_DEVICE update on ppc and sparc 2015-06-10 08:00:37 +02:00
s390x s390x: Switch to s390-ccw machine as default 2015-06-17 12:40:52 +02:00
scsi virtio, pci fixes, enhancements 2015-06-19 11:30:57 +01:00
sd hw/sd/pxa2xx_mmci: Stop using old_mmio in MemoryRegionOps 2015-06-15 18:06:09 +01:00
sh4 sh4/r2d: convert to new MMIO accessor style 2015-06-12 12:02:48 +02:00
sparc fw_cfg: fix FW_CFG_BOOT_DEVICE update on ppc and sparc 2015-06-10 08:00:37 +02:00
sparc64 fw_cfg: fix FW_CFG_BOOT_DEVICE update on ppc and sparc 2015-06-10 08:00:37 +02:00
ssi omap: Fix warnings from Sparse 2015-03-19 11:11:55 +03:00
timer mc146818rtc: Reset the periodic timer on load 2015-06-19 12:27:14 +02:00
tpm TPM2 ACPI table support 2015-06-01 14:18:54 +02:00
tricore target-tricore: check return value before using it 2014-11-02 10:04:34 +03:00
unicore32 hw/unicore32/puv3.c: Fix misusing qemu_allocate_irqs for single irq 2015-06-03 14:21:24 +03:00
usb migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
vfio vfio: fix build error on CentOS 5.7 2015-06-18 10:35:59 +01:00
virtio balloon: add a feature bit to let Guest OS deflate balloon on oom 2015-06-23 17:08:21 +02:00
watchdog watchdog: Add new Virtual Watchdog action INJECT-NMI 2015-06-11 17:45:50 +02:00
xen xen_backend: Remove unused error handling of qemu_set_fd_handler 2015-06-12 13:26:21 +01:00
xenpv hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
xtensa xtensa: Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
Makefile.objs vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio 2014-12-19 15:24:06 -07:00