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David Hildenbrand 27f852795a virtio-mem: don't special-case ZONE_MOVABLE 
When introducing virtio-mem, the semantics of ZONE_MOVABLE were rather
unclear, which is why we special-cased ZONE_MOVABLE such that partially
plugged blocks would never end up in ZONE_MOVABLE.

Now that the semantics are much clearer (and will be documented in a
follow-up patch including the new virtio-mem behavior), let's allow to
online partially plugged memory blocks to ZONE_MOVABLE and also consider
memory blocks that were onlined to ZONE_MOVABLE when unplugging memory.
While unplugged memory pages are, in general, unmovable, they can be
skipped when offlining memory.

virtio-mem only unplugs fairly big chunks (in the megabyte range) and
rather tries to shrink the memory region than randomly choosing memory.
In theory, if all other pages in the movable zone would be movable,
virtio-mem would only shrink that zone and not create any kind of
fragmentation.

In the future, we might want to remember the zone again and use the
information when (un)plugging memory.  For now, let's keep it simple.

Note: Support for defragmentation is planned, to deal with fragmentation
after unplug due to memory chunks within memory blocks that could not get
unplugged before (e.g., somebody pinning pages within ZONE_MOVABLE for a
longer time).

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Qian Cai <cai@lca.pw>
Link: http://lkml.kernel.org/r/20200816125333.7434-6-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2020-10-13 18:38:33 -07:00
..
accessibility Char/Misc driver fixes for 5.9-rc3 2020-08-26 10:50:50 -07:00
acpi ACPI: HMAT: refactor hmat_register_target_device to hmem_register_device 2020-10-13 18:38:27 -07:00
amba
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android drivers: android: Fix the SPDX comment style 2020-07-29 17:05:44 +02:00
ata ata: ahci: mvebu: Make SATA PHY optional for Armada 3720 2020-10-09 12:47:56 -06:00
atm atm: eni: fix the missed pci_disable_device() for eni_init_one() 2020-09-04 21:42:57 -07:00
auxdisplay A trivial patch for auxdisplay: 2020-09-05 14:22:46 -07:00
base drivers/base: make device_find_child_by_name() compatible with sysfs inputs 2020-10-13 18:38:28 -07:00
bcma bcma: gpio: Use irqchip template 2020-08-02 18:26:51 +03:00
block drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next 2020-07-31 15:11:52 -07:00
bus treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
cdrom gdrom: use bdev_check_media_change 2020-09-10 09:32:31 -06:00
char block-5.10-2020-10-12 2020-10-13 12:12:44 -07:00
clk clk: socfpga: stratix10: fix the divider for the emac_ptp_free_clk 2020-09-22 12:54:41 -07:00
clocksource Updates for timekeeping, timers and related drivers: 2020-10-12 11:27:54 -07:00
connector
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counter counter: microchip-tcb-capture: check the correct variable 2020-08-22 11:38:42 +01:00
cpufreq cpufreq: intel_pstate: Fix missing return statement 2020-09-30 17:37:23 +02:00
cpuidle cpuidle: Drop misleading comments about RCU usage 2020-09-22 19:32:03 +02:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-10-13 08:50:16 -07:00
dax device-dax: add a range mapping allocation attribute 2020-10-13 18:38:29 -07:00
dca
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devfreq PM / devfreq: tegra30: Disable clock on error in probe 2020-09-23 13:35:58 +09:00
dio
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dma dmaengine: dmatest: Prevent to run on misconfigured channel 2020-09-22 20:18:05 +05:30
dma-buf dmabuf: fix NULL pointer dereference in dma_buf_release() 2020-09-21 11:17:06 +02:00
edac EFI changes for v5.10: 2020-10-12 13:26:49 -07:00
eisa
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extcon
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firewire treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
firmware efi/fake_mem: arrange for a resource entry per efi_fake_mem instance 2020-10-13 18:38:27 -07:00
fpga Linux 5.8-rc7 2020-07-27 11:49:37 +02:00
fsi
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gnss
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gpio GPIO bulk changes for the v5.10 kernel cycle: 2020-10-13 10:09:33 -07:00
gpu i915: use find_lock_page instead of find_lock_entry 2020-10-13 18:38:29 -07:00
greybus greybus: Use fallthrough pseudo-keyword 2020-07-29 16:58:08 +02:00
hid Linux 5.9-rc4 2020-09-07 16:13:06 +02:00
hsi treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
hv hyperv-fixes for 5.9-rc6 2020-09-15 16:20:43 -07:00
hwmon hwmon: (pmbus/max20730) adjust the vout reading given voltage divider 2020-10-06 14:54:55 -07:00
hwspinlock hwspinlock: qcom: Allow mmio usage in addition to syscon 2020-07-13 22:29:28 -07:00
hwtracing treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
i2c i2c: owl: Clear NACK and BUS error bits 2020-10-10 13:15:46 +02:00
i3c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ide block-5.10-2020-10-12 2020-10-13 12:12:44 -07:00
idle cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED generic 2020-08-26 12:41:53 +02:00
iio iio: adc: qcom-spmi-adc5: fix driver name 2020-09-22 13:33:19 +01:00
infiniband block-5.10-2020-10-12 2020-10-13 12:12:44 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2020-10-03 11:37:23 -07:00
interconnect interconnect: qcom: Fix small BW votes being truncated to zero 2020-09-04 00:07:12 +03:00
iommu Surgery of the MSI interrupt handling to prepare the support of upcoming 2020-10-12 11:40:41 -07:00
ipack
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irqchip Merge branch 'irq/mstar' into irq/irqchip-next 2020-10-10 12:46:54 +01:00
isdn treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
leds LEDs changes for 5.9-rc1. 2020-08-05 19:24:27 -07:00
lightnvm treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
macintosh treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mailbox iomap: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
mcb
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md drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
media media: dvb-frontends/drxk_hard.c: fix uninitialized variable warning 2020-10-08 14:15:14 +02:00
memory treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
memstick Merge branch 'fixes' into next 2020-09-28 12:17:36 +02:00
message treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mfd - Bug Fixes 2020-08-28 10:15:33 -07:00
misc Initial support for sharing virtual addresses between the CPU and 2020-10-12 10:40:34 -07:00
mmc block-5.10-2020-10-12 2020-10-13 12:12:44 -07:00
most drivers: most: add USB adapter driver 2020-07-31 14:38:12 +02:00
mtd block-5.10-2020-10-12 2020-10-13 12:12:44 -07:00
mux treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
net Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-10-13 08:50:16 -07:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
ntb treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nubus
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nvdimm mm/memremap_pages: support multiple ranges per invocation 2020-10-13 18:38:28 -07:00
nvme drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
nvmem nvmem: qcom-spmi-sdam: Enable multiple devices 2020-07-29 17:12:09 +02:00
of of: address: Work around missing device_type property in pcie nodes 2020-08-19 16:30:57 -06:00
opp Merge branch 'opp/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm 2020-09-01 19:44:20 +02:00
oprofile module: Fix up module_notifier return values 2020-09-01 09:58:03 +02:00
parisc Merge branch 'parisc-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2020-08-12 12:41:15 -07:00
parport treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pci mm/memremap_pages: support multiple ranges per invocation 2020-10-13 18:38:28 -07:00
pcmcia treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
perf perf: arm-cmn: Fix conversion specifiers for node type 2020-10-01 22:30:07 +01:00
phy phy: Second round of fixes for 5.9 2020-09-29 17:21:54 +02:00
pinctrl GPIO bulk changes for the v5.10 kernel cycle: 2020-10-13 10:09:33 -07:00
platform platform-drivers-x86 for v5.9-3 2020-10-06 12:00:52 -07:00
pnp
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power Power Supply Fixes for 5.9 cycle 2020-10-09 11:38:07 -07:00
powercap powercap: RAPL: Add support for Lakefield 2020-09-16 14:16:04 +02:00
pps
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ps3 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ptp ptp: ptp_clockmatrix: use i2c_master_send for i2c write 2020-08-19 16:23:22 -07:00
pwm pwm: Changes for v5.9-rc1 2020-08-14 16:00:09 -07:00
rapidio rapidio: Replace 'select' DMAENGINES 'with depends on' 2020-09-05 19:52:54 +03:00
ras RAS/CEC: Convert to DEFINE_SHOW_ATTRIBUTE() 2020-09-25 19:05:31 +02:00
regulator Merge remote-tracking branch 'regulator/for-5.10' into regulator-next 2020-10-05 16:54:56 +01:00
remoteproc remoteproc: scp: add COMPILE_TEST dependency 2020-09-26 09:40:05 +02:00
reset treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rpmsg treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rtc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
s390 block-5.10-2020-10-12 2020-10-13 12:12:44 -07:00
sbus
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scsi drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
sfi
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sh iomap: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
siox
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slimbus
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soc soc/tegra: pmc: Don't create fake interrupt hierarchy levels 2020-10-10 12:12:11 +01:00
soundwire soundwire: fix double free of dangling pointer 2020-09-03 14:10:19 +05:30
spi spi: Fix for v5.9 2020-10-09 18:05:12 -07:00
spmi
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ssb treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
staging media updates for v5.10-rc1 2020-10-13 09:37:02 -07:00
target block-5.10-2020-10-12 2020-10-13 12:12:44 -07:00
tc
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tee Enable multi-stage OP-TEE bus enumeration 2020-07-13 15:11:44 +02:00
thermal - Fix bogus thermal shutdowns for omap4430 where bogus values 2020-09-04 12:49:03 -07:00
thunderbolt thunderbolt: Fix for v5.9-rc6 2020-09-15 13:52:14 +02:00
tty serial: 8250_pci: Add Realtek 816a and 816b 2020-09-16 13:23:33 +02:00
uio
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usb usbcore/driver: Accommodate usbip 2020-09-25 16:53:02 +02:00
vdpa vdpa/mlx5: Fix dependency on MLX5_CORE 2020-10-08 16:02:00 -04:00
vfio treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
vhost vhost-vdpa: fix page pinning leakage in error path 2020-10-04 03:47:02 -04:00
video drm-misc-fixes for v5.9: 2020-10-06 12:38:28 +10:00
virt
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virtio virtio-mem: don't special-case ZONE_MOVABLE 2020-10-13 18:38:33 -07:00
visorbus
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vlynq
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vme
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w1
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watchdog treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
xen mm/memremap_pages: support multiple ranges per invocation 2020-10-13 18:38:28 -07:00
zorro zorro: Fix address space collision message with RAM expansion boards 2020-08-26 13:26:52 +02:00
Kconfig
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Makefile
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