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bc2c030322
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Ian Campbell bc2c030322 xen: try harder to balloon up under memory pressure. 
Currently if the balloon driver is unable to increase the guest's
reservation it assumes the failure was due to reaching its full
allocation, gives up on the ballooning operation and records the limit
it reached as the "hard limit". The driver will not try again until
the target is set again (even to the same value).

However it is possible that ballooning has in fact failed due to
memory pressure in the host and therefore it is desirable to keep
attempting to reach the target in case memory becomes available. The
most likely scenario is that some guests are ballooning down while
others are ballooning up and therefore there is temporary memory
pressure while things stabilise. You would not expect a well behaved
toolstack to ask a domain to balloon to more than its allocation nor
would you expect it to deliberately over-commit memory by setting
balloon targets which exceed the total host memory.

This patch drops the concept of a hard limit and causes the balloon
driver to retry increasing the reservation on a timer in the same
manner as when decreasing the reservation.

Also if we partially succeed in increasing the reservation
(i.e. receive less pages than we asked for) then we may as well keep
those pages rather than returning them to Xen.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Stable Kernel <stable@kernel.org>
2009-12-04 08:15:19 -08:00
..
accessibility
acpi Merge branch 'misc' into release 2009-10-15 00:47:13 -04:00
amba
ata sata_mv: Prevent PIO commands to be defered too long if traffic in progress. 2009-10-16 06:22:46 -04:00
atm net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
auxdisplay
base mm: oom analysis: add shmem vmstat 2009-09-22 07:17:27 -07:00
block virtio_blk: Revert serial number support 2009-10-22 16:39:30 +10:30
bluetooth
cdrom sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
char xen/hvc: make sure console output is always emitted, with explicit polling 2009-11-03 11:05:51 -08:00
clocksource
connector connector: Fix incompatible pointer type warning 2009-10-06 01:39:51 -07:00
cpufreq Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq 2009-09-18 09:16:57 -07:00
cpuidle cpuidle: menu governor: reduce latency on exit 2009-09-22 07:17:45 -07:00
crypto crypto: padlock-sha - Fix stack alignment 2009-09-21 23:21:53 -07:00
dca
dio
dma Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx into for-linus 2009-09-23 18:31:11 +10:00
edac amd64_edac: fix DRAM base and limit extraction masks, v2 2009-10-16 18:51:22 +02:00
eisa
firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2009-10-14 15:36:19 -07:00
firmware iSCSI/iBFT: use proper address translation 2009-10-05 12:05:40 -07:00
gpio const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
gpu Merge branch 'drm-intel-next' of git://git.kernel.org/pub/scm/linux/kernel/git/anholt/drm-intel 2009-10-09 09:19:23 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2009-10-13 10:10:33 -07:00
hwmon Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2009-10-11 11:23:33 -07:00
i2c i2c: Hide probe errors caused by ACPI resource conflicts 2009-10-04 22:53:45 +02:00
ide ahci / atiixp / pci quirks: rename AMD SB900 into Hudson-2 2009-10-16 06:21:20 -04:00
idle
ieee1394 headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
ieee802154
infiniband headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-10-22 08:27:12 +09:00
isdn headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
leds leds: leds-pca9532 - Drop unused module parameters 2009-10-04 22:53:43 +02:00
lguest headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
macintosh powerpc/pmac: Fix issues with sleep on some powerbooks 2009-10-14 16:58:35 +11:00
mca
md dm snapshot: allow chunk size to be less than page size 2009-10-16 23:18:22 +01:00
media headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
memstick memstick: move dev_dbg 2009-09-24 07:21:05 -07:00
message headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
mfd mfd: Fix twl4030 boot with twl4030 usb transceiver enabled 2009-10-12 15:19:23 +02:00
misc headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
mmc mmc: at91_mci: Don't include asm/mach/mmc.h 2009-10-22 08:22:25 +09:00
mtd headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2009-10-23 07:35:16 +09:00
nubus
of of: remove "stm,m25p40" alias 2009-09-23 07:39:43 -07:00
oprofile oprofile: warn on freeing event buffer too early 2009-10-09 21:32:05 +02:00
parisc mm: replace various uses of num_physpages by totalram_pages 2009-09-22 07:17:38 -07:00
parport sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
pci ahci / atiixp / pci quirks: rename AMD SB900 into Hudson-2 2009-10-16 06:21:20 -04:00
pcmcia Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-10-02 16:20:43 -07:00
platform Merge branch 'misc' into release 2009-10-15 00:47:13 -04:00
pnp ACPI: remove acpi_device.flags.hardware_id 2009-09-25 15:09:48 -04:00
power Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2009-09-23 03:49:27 +04:00
pps
ps3
rapidio
regulator regulator: fix voltage range in da9034 ldo12 2009-09-22 13:58:23 +01:00
rtc headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
s390 [S390] sclp_vt220 build fix 2009-10-14 12:43:54 +02:00
sbus const: make block_device_operations const 2009-09-22 07:17:25 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2009-10-11 11:12:33 -07:00
serial tty, serial: Fix race and NULL check in uart_close() 2009-10-12 10:21:33 -07:00
sfi SFI: remove __init from sfi_verify_table 2009-10-03 01:16:12 -04:00
sh
sn
spi ARM: 5741/1: pl022: fix peripheral id for ST vendor 2009-10-05 17:55:55 +01:00
ssb ssb/sdio: fix printk format warnings 2009-09-23 11:35:41 -04:00
staging Staging: rt2860sta: prevent a panic when disabling when associated 2009-10-14 14:14:40 -07:00
tc
telephony
thermal thermal: add missing Kconfig dependency 2009-09-19 01:41:49 -04:00
uio headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
usb USB: gadget: Fix EEM driver comments and VID/PID 2009-10-14 14:54:44 -07:00
uwb headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
video Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 2009-10-08 12:01:01 -07:00
virtio move virtballoon_remove to .devexit.text 2009-10-22 16:39:31 +10:30
vlynq drivers/vlynq/vlynq.c: fix resource size off by 1 error 2009-09-24 07:21:05 -07:00
w1 ds2482: Discard obsolete detect method 2009-10-04 22:53:41 +02:00
watchdog watchdog: Fix rio watchdog probe function 2009-10-14 01:18:26 -07:00
xen xen: try harder to balloon up under memory pressure. 2009-12-04 08:15:19 -08:00
zorro
Kconfig
Makefile Merge git://git.infradead.org/mtd-2.6 2009-09-23 10:07:49 -07:00