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Adam Litke 1f34c71afe virtio: Fix scheduling while atomic in virtio_balloon stats 
This is a fix for my earlier patch: "virtio: Add memory statistics reporting to
the balloon driver (V4)".

I discovered that all_vm_events() can sleep and therefore stats collection
cannot be done in interrupt context.  One solution is to handle the interrupt
by noting that stats need to be collected and waking the existing vballoon
kthread which will complete the work via stats_handle_request().  Rusty, is
this a saner way of doing business?

There is one issue that I would like a broader opinion on.  In stats_request, I
update vb->need_stats_update and then wake up the kthread.  The kthread uses
vb->need_stats_update as a condition variable.  Do I need a memory barrier
between the update and wake_up to ensure that my kthread sees the correct
value?  My testing suggests that it is not needed but I would like some
confirmation from the experts.

Signed-off-by: Adam Litke <agl@us.ibm.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Anthony Liguori <aliguori@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
 		2010-02-24 14:22:14 +10:30
..
accessibility drop explicit include of autoconf.h 2009-12-12 13:08:15 +01:00
acpi Merge branches 'bugzilla-14886', 'bugzilla-15000', 'bugzilla-15040', 'bugzilla-15108', 'pdc', 'hotplug-null-ref' and 'thinkpad' into release 2010-02-18 03:51:04 -05:00
amba
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ata [libata] Call flush_dcache_page after PIO data transfers in libata-sff.c 2010-02-04 01:04:50 -05:00
atm drivers/atm: Correct code taking the size of a pointer 2009-12-13 19:56:33 -08:00
auxdisplay
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base class: Free the class private data in class_release 2010-02-16 15:43:00 -08:00
block cciss: Make cciss_seq_show handle holes in the h->drv[] array 2010-02-05 13:15:36 +01:00
bluetooth Bluetooth: Fix memory leak in Marvell BT-over-SDIO driver 2010-02-03 19:08:30 -08:00
cdrom Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2009-12-09 19:03:16 -08:00
char Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-02-11 14:01:10 -08:00
clocksource geode-mfgpt: restore previous behavior for selecting IRQ 2010-02-22 19:50:34 -08:00
connector connector: Delete buggy notification code. 2010-02-02 15:58:48 -08:00
cpufreq [CPUFREQ] Fix ondemand to not request targets outside policy limits 2010-01-13 10:55:16 -05:00
cpuidle drivers/cpuidle/governors/menu.c: fix undefined reference to `__udivdi3' 2010-01-11 09:34:07 -08:00
crypto crypto: padlock-sha - Add import/export support 2010-02-02 06:50:25 +11:00
dca
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dio m68k: don't export static inline functions 2009-12-06 11:18:28 +01:00
dma drivers/dma: Correct NULL test 2010-02-10 12:07:28 -07:00
edac Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp 2010-02-11 14:07:13 -08:00
eisa
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firewire firewire: ohci: retransmit isochronous transmit packets on cycle loss 2010-02-14 15:10:41 +01:00
firmware firmware: only allow EDD on x86 2009-12-15 08:53:34 -08:00
gpio gpio: adp5588-gpio: new driver for ADP5588 GPIO expanders 2010-01-11 09:34:07 -08:00
gpu i915 / PM: Fix hibernate regression caused by suspend/resume splitting 2010-02-22 08:47:14 -08:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2010-01-13 16:10:13 -08:00
hwmon hwmon: (w83781d) Request I/O ports individually for probing 2010-02-05 19:58:36 +01:00
i2c i2c-tiny-usb: Fix on big-endian systems 2010-02-05 17:48:13 +01:00
ide Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-12-12 14:27:24 -08:00
idle cpumask: convert drivers/idle/i7300_idle.c to cpumask_var_t 2009-12-17 11:43:25 +10:30
ieee1394 firewire, ieee1394: update Kconfig help 2009-12-29 19:58:17 +01:00
ieee802154
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infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2010-02-11 14:01:25 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-02-22 08:48:06 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-01-12 20:53:29 -08:00
leds leds: leds-pwm: Set led_classdev max_brightness 2009-12-17 11:42:34 +00:00
lguest lguest: fix bug in setting guest GDT entry 2010-01-04 12:33:33 -08:00
macintosh powerpc/macintosh: Make Open Firmware device id constant 2010-01-15 13:26:04 +11:00
mca
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md dm: sysfs revert add empty release function to avoid debug warning 2010-02-16 18:43:04 +00:00
media V4L/DVB: bttv: Move I2C IR initialization 2010-02-19 03:19:02 -02:00
memstick
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message [SCSI] mptfusion : mptscsih_abort return value should be SUCCESS instead of value 0. 2010-02-08 13:40:17 -06:00
mfd mfd: Fix asic3 build 2010-01-29 21:03:09 +01:00
misc Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2009-12-17 16:38:48 -08:00
mmc mmc_test: block addressed cards 2010-02-11 13:59:42 -08:00
mtd Merge branch 'for-linus' of git://git.infradead.org/ubi-2.6 2010-01-28 12:57:50 -08:00
net sfc: SFE4002/SFN4112F: Widen temperature and voltage tolerances 2010-02-19 15:50:35 -08:00
nubus
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of Merge commit 'origin/master' into next 2009-12-09 17:14:38 +11:00
oprofile Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-12-14 09:58:24 -08:00
parisc parisc: Fixup last users of irq_chip->typename 2009-12-16 03:48:56 +00:00
parport parport_pc.c: use correct length in strncmp 2009-12-16 07:20:12 -08:00
pci Merge branches 'bugzilla-14886', 'bugzilla-15000', 'bugzilla-15040', 'bugzilla-15108', 'pdc', 'hotplug-null-ref' and 'thinkpad' into release 2010-02-18 03:51:04 -05:00
pcmcia Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-12-30 13:13:24 -08:00
platform thinkpad-acpi: wrong thermal attribute_group removed in thermal_exit() 2010-02-16 03:10:10 -05:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-12-16 12:33:19 -08:00
power wm97xx_battery: Handle missing platform data gracefully 2010-01-29 17:00:18 +03:00
pps
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ps3
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rapidio
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regulator regulator/lp3971: vol_map out of bounds in lp3971_{ldo,dcdc}_set_voltage() 2010-02-12 11:39:49 +00:00
rtc rtc-fm3130: add missing braces 2010-02-02 18:11:21 -08:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2010-02-11 14:05:55 -08:00
sbus bbc_envctrl: Clean up properly if kthread_run() fails. 2010-01-04 15:31:10 -08:00
scsi Merge master.kernel.org:/home/rmk/linux-2.6-arm 2010-02-20 16:55:05 -08:00
serial serial: 8250: add serial transmitter fully empty test 2010-02-16 15:55:51 -08:00
sfi
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sh sh: pfc: Fixup type mismatch in debug printks. 2009-12-09 15:51:27 +09:00
sn ioc3/ioc4: fix error path on driver registration 2009-12-15 08:53:27 -08:00
spi spi: spi_sh_msiof: Fixed data sampling on the correct edge 2010-02-02 11:29:15 +09:00
ssb ssb: Fix CONFIG_SSB_SDIOHOST typo 2010-02-03 16:55:20 -05:00
staging Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-02-01 10:46:49 -08:00
tc
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telephony Merge branch 'for-next' into for-linus 2009-12-07 18:36:35 +01:00
thermal Merge branch 'misc-2.6.33' into release 2009-12-16 14:22:32 -05:00
uio const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
usb USB: gadget: fix EEM gadget CRC usage 2010-02-16 15:11:10 -08:00
uwb
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video efifb: fix framebuffer handoff 2010-02-22 19:50:34 -08:00
virtio virtio: Fix scheduling while atomic in virtio_balloon stats 2010-02-24 14:22:14 +10:30
vlynq
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w1
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watchdog [WATCHDOG] bfin: fix max timeout calculation 2010-02-21 19:16:30 +00:00
xen xen: fix hang on suspend. 2010-01-13 10:01:35 +00:00
zorro m68k: don't export static inline functions 2009-12-06 11:18:28 +01:00
Kconfig firewire, ieee1394: update Kconfig help 2009-12-29 19:58:17 +01:00
Makefile
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