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Sebastian Andrzej Siewior 6923aa0d8c mm/compaction: Disable compact_unevictable_allowed on RT 
Since commit 5bbe3547aa ("mm: allow compaction of unevictable pages")
it is allowed to examine mlocked pages and compact them by default.  On
-RT even minor pagefaults are problematic because it may take a few 100us
to resolve them and until then the task is blocked.

Make compact_unevictable_allowed = 0 default and issue a warning on RT if
it is changed.

[bigeasy@linutronix.de: v5]
  Link: https://lore.kernel.org/linux-mm/20190710144138.qyn4tuttdq6h7kqx@linutronix.de/
  Link: http://lkml.kernel.org/r/20200319165536.ovi75tsr2seared4@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/linux-mm/20190710144138.qyn4tuttdq6h7kqx@linutronix.de/
Link: http://lkml.kernel.org/r/20200303202225.nhqc3v5gwlb7x6et@linutronix.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-02 09:35:31 -07:00
..
ABI TTY/Serial patches for 5.7-rc1 2020-03-31 16:18:55 -07:00
accounting doc: cgroup: improve formatting of references 2020-03-02 12:57:03 -07:00
admin-guide mm/compaction: Disable compact_unevictable_allowed on RT 2020-04-02 09:35:31 -07:00
arm docs: arm: tcm: Fix a few typos 2020-02-19 02:42:21 -07:00
arm64 arm64 updates for 5.7: 2020-03-31 10:05:01 -07:00
block block: Document genhd capability flags 2020-03-12 07:47:22 -06:00
bpf bpf: lsm: Add Documentation 2020-03-30 01:35:12 +02:00
cdrom docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
core-api mm: add pagemap.h to the fine documentation 2020-04-02 09:35:29 -07:00
cpu-freq docs: cpu-freq: convert cpufreq-stats.txt to ReST 2020-03-06 00:01:02 +01:00
crypto crypto: algapi - make unregistration functions return void 2019-12-20 14:58:35 +08:00
dev-tools This has been a busy cycle for documentation work. Highlights include: 2020-03-30 12:45:23 -07:00
devicetree Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-03-31 17:29:33 -07:00
doc-guide Documentation: build warnings related to missing blank lines after explicit markups has been fixed 2020-02-05 10:30:03 -07:00
driver-api Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:13:08 -07:00
fault-injection docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
fb fbdev: fbmem: allow overriding the number of bootup logos 2020-01-03 14:27:40 +01:00
features documentation: vm: Advertise support for pte_special in riscv 2020-02-19 02:41:01 -07:00
filesystems fscrypt updates for 5.7 2020-03-31 12:58:36 -07:00
firmware-guide docs: firmware-guide: ACPI: Replace dma_request_slave_channel() with dma_request_chan() 2019-12-19 22:58:12 +01:00
firmware_class
fpga Documentation: fpga: dfl: add descriptions for thermal/power management interfaces 2019-10-16 19:18:26 -07:00
gpu docs: gpu: i915.rst: fix warnings due to file renames 2020-02-25 03:02:35 -07:00
hid docs: add some documentation dirs to the driver-api book 2019-07-15 11:03:02 -03:00
hwmon docs: hwmon: Update documentation for isl68137 pmbus driver 2020-03-22 16:42:54 -07:00
i2c docs: i2c: writing-clients: properly name the stop condition 2020-01-29 22:02:09 +01:00
ia64 docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
ide docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
iio docs: add some documentation dirs to the driver-api book 2019-07-15 11:03:02 -03:00
infiniband Documentation/infiniband: update name of some functions 2019-09-13 16:55:55 -03:00
input Input: docs: fix spelling mistake "potocol" -> "protocol" 2019-08-06 11:24:49 -06:00
isdn isdn: capi: dead code removal 2019-12-11 09:12:38 +01:00
kbuild Kbuild updates for v5.7 2020-03-31 16:03:39 -07:00
kernel-hacking docs: locking: Drop :c:func: throughout 2020-03-20 17:16:24 -06:00
leds leds: core: Add support for composing LED class device names 2019-07-25 20:07:52 +02:00
livepatch livepatch: Documentation of the new API for tracking system state changes 2019-11-01 13:08:24 +01:00
locking Documentation/locking/locktypes: Minor copy editor fixes 2020-03-28 12:47:34 +01:00
m68k docs: README.buddha: convert to ReST and add to m68k book 2019-07-31 13:30:10 -06:00
maintainer Add a maintainer entry profile for documentation 2020-01-24 09:48:39 -07:00
media media updates for v5.7-rc1 2020-03-30 13:42:05 -07:00
mips docs: mips: remove no longer needed au1xxx_ide.rst documentation 2020-03-24 15:53:48 +01:00
misc-devices docs: Move Intel Many Integrated Core documentation (mic) under misc-devices 2020-03-10 11:12:34 -06:00
netlabel docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
networking Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-03-31 17:29:33 -07:00
nios2 docs: nios2: add it to the main Documentation body 2019-07-31 13:31:51 -06:00
nvdimm docs: nvdimm: use ReST notation for subsection 2020-01-24 09:54:42 -07:00
openrisc docs: openrisc: convert to ReST and add to documentation body 2019-07-31 13:30:20 -06:00
parisc docs: parisc: convert to ReST and add to documentation body 2019-07-31 13:30:15 -06:00
PCI docs: fix pointers to io-mapping.rst and io_ordering.rst files 2020-03-11 14:15:20 -06:00
pcmcia docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
power Merge branches 'pm-core', 'pm-sleep', 'pm-acpi' and 'pm-domains' 2020-03-30 14:46:58 +02:00
powerpc docs: prevent warnings due to autosectionlabel 2020-03-20 17:01:29 -06:00
process This has been a busy cycle for documentation work. Highlights include: 2020-03-30 12:45:23 -07:00
RCU doc: Add rcutorture scripting to torture.txt 2020-02-27 07:03:14 -08:00
riscv It has been a relatively quiet cycle for documentation, but there's still a 2020-01-29 15:27:31 -08:00
s390 Documentation/s390: remove outdated debugging390 documentation 2019-08-21 12:41:43 +02:00
scheduler Documentation/scheduler: fix links in sched-stats 2019-10-29 04:35:41 -06:00
scsi scsi: simplify scsi_partsize 2020-03-24 07:57:07 -06:00
security docs: prevent warnings due to autosectionlabel 2020-03-20 17:01:29 -06:00
sh docs: remove extra conf.py files 2019-07-17 06:57:52 -03:00
sound sound updates for 5.6-rc1 2020-01-28 16:26:57 -08:00
sparc docs: add arch doc directories to the index 2019-07-15 11:03:01 -03:00
sphinx docs: Fix empty parallelism argument 2020-02-25 03:11:04 -07:00
sphinx-static doc-rst: Reduce CSS padding around Field 2019-10-02 10:03:06 -06:00
spi spi: docs: convert to ReST and add it to the kABI bookset 2019-07-31 14:13:13 -06:00
target docs: prevent warnings due to autosectionlabel 2020-03-20 17:01:29 -06:00
timers docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
trace Power management updates for 5.7-rc1 2020-03-30 15:05:01 -07:00
translations media updates for v5.7-rc1 2020-03-30 13:42:05 -07:00
usb usb: gadget: add raw-gadget interface 2020-03-15 11:34:48 +02:00
userspace-api docs: userspace: ioctl-number: remove mc146818rtc conflict 2020-02-13 11:42:02 -07:00
virt KVM: SVM: document KVM_MEM_ENCRYPT_OP, let userspace detect if SEV is available 2020-03-20 13:47:52 -04:00
vm mm/zswap.c: add allocation hysteresis if pool limit is hit 2020-01-31 10:30:39 -08:00
w1 docs: w1: Fix a typo in omap-hdq.rst 2019-12-30 11:58:02 -07:00
watchdog linux-watchdog 5.4-rc1 tag 2019-09-27 11:17:38 -07:00
x86 Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-31 11:04:05 -07:00
xtensa docs: add arch doc directories to the index 2019-07-15 11:03:01 -03:00
.gitignore
asm-annotations.rst Documentation: Call out example SYM_FUNC_* usage as x86-specific 2020-01-16 12:53:16 -07:00
atomic_bitops.txt
atomic_t.txt
bus-virt-phys-mapping.txt
Changes
CodingStyle
conf.py docs: conf.py: avoid thousands of duplicate label warning on Sphinx 2020-03-20 17:01:34 -06:00
COPYING-logo docs: logo.txt: rename it to COPYING-logo 2019-07-15 09:20:27 -03:00
crc32.txt
debugging-via-ohci1394.txt
digsig.txt
DMA-API-HOWTO.txt docs: DMA-API-HOWTO.txt: fix an unmarked code block 2019-07-15 09:20:24 -03:00
DMA-API.txt dma-mapping: remove dma_release_declared_memory 2019-09-04 11:13:19 +02:00
DMA-attributes.txt dma-mapping: remove the DMA_ATTR_WRITE_BARRIER flag 2019-11-14 12:01:54 -04:00
DMA-ISA-LPC.txt
docutils.conf
dontdiff modpost: dump missing namespaces into a single modules.nsdeps file 2019-11-11 20:10:01 +09:00
futex-requeue-pi.txt
hwspinlock.txt
index.rst Power management updates for 5.7-rc1 2020-03-30 15:05:01 -07:00
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
Kconfig
kprobes.txt
kref.txt docs: kref: Clarify the use of two kref_put() in example code 2020-02-25 03:39:10 -07:00
logo.gif
lzo.txt
mailbox.txt
Makefile Kbuild updates for v5.7 2020-03-31 16:03:39 -07:00
memory-barriers.txt Documentation/memory-barriers: Fix typos 2020-02-27 07:03:14 -08:00
nommu-mmap.txt
percpu-rw-semaphore.txt
pi-futex.txt docs: locking: convert docs to ReST and rename to *.rst 2019-07-15 08:53:27 -03:00
preempt-locking.txt
rbtree.txt docs: rbtree.txt: fix Sphinx build warnings 2019-07-15 09:20:24 -03:00
remoteproc.txt
robust-futex-ABI.txt threads: Update PID limit comment according to futex UAPI change 2020-03-21 17:48:13 +01:00
robust-futexes.txt
rpmsg.txt
speculation.txt
static-keys.txt
SubmittingPatches
tee.txt Documentation: tee: add AMD-TEE driver details 2020-01-04 13:49:51 +08:00
this_cpu_ops.txt
unaligned-memory-access.txt
xz.txt