Mel Gorman 24512228b7 mm: do not boost watermarks to avoid fragmentation for the DISCONTIG memory model ... Mikulas Patocka reported that commit 1c30844d2d ("mm: reclaim small amounts of memory when an external fragmentation event occurs") "broke" memory management on parisc. The machine is not NUMA but the DISCONTIG model creates three pgdats even though it's a UMA machine for the following ranges 0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB 1) Start 0x0000000100000000 End 0x00000001bfdfffff Size 3070 MB 2) Start 0x0000004040000000 End 0x00000040ffffffff Size 3072 MB Mikulas reported: With the patch 1c30844d2, the kernel will incorrectly reclaim the first zone when it fills up, ignoring the fact that there are two completely free zones. Basiscally, it limits cache size to 1GiB. For example, if I run: # dd if=/dev/sda of=/dev/null bs=1M count=2048 - with the proper kernel, there should be "Buffers - 2GiB" when this command finishes. With the patch 1c30844d2, buffers will consume just 1GiB or slightly more, because the kernel was incorrectly reclaiming them. The page allocator and reclaim makes assumptions that pgdats really represent NUMA nodes and zones represent ranges and makes decisions on that basis. Watermark boosting for small pgdats leads to unexpected results even though this would have behaved reasonably on SPARSEMEM. DISCONTIG is essentially deprecated and even parisc plans to move to SPARSEMEM so there is no need to be fancy, this patch simply disables watermark boosting by default on DISCONTIGMEM. Link: http://lkml.kernel.org/r/20190419094335.GJ18914@techsingularity.net Fixes: 1c30844d2d ("mm: reclaim small amounts of memory when an external fragmentation event occurs") Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Reported-by: Mikulas Patocka <mpatocka@redhat.com> Tested-by: Mikulas Patocka <mpatocka@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: James Bottomley <James.Bottomley@hansenpartnership.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2019-04-26 09:18:05 -07:00
..
ABI	device-dax for 5.1	2019-03-16 13:05:32 -07:00
EDID	Docs/EDID: Calculate CRC while building the code	2018-11-06 07:36:22 -07:00
PCI	pci-v4.20-changes	2018-10-25 06:50:48 -07:00
RCU	A fairly routine cycle for docs - lots of typo fixes, some new documents,	2019-03-09 09:56:17 -08:00
accelerators	…
accounting	psi: clarify the units used in pressure files	2019-04-05 16:02:31 -10:00
acpi	ACPI: Documentation: Fix path for acpidbg tool	2019-03-07 11:28:33 +01:00
admin-guide	for-5.1/block-post-20190315	2019-03-16 12:36:39 -07:00
aoe	…
arm	ARM: 8833/1: Ensure that NEON code always compiles with Clang	2019-02-12 15:20:09 +00:00
arm64	arm64 updates for 5.1:	2019-03-10 10:17:23 -07:00
auxdisplay	…
backlight	…
block	block: document usage of bio iterator helpers	2019-02-15 08:40:12 -07:00
blockdev	zram: idle writeback fixes and cleanup	2019-01-08 17:15:10 -08:00
bpf	bpf, doc: fix BTF docs reflow of bullet list	2019-03-26 13:13:42 -07:00
bus-devices	…
cdrom	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
cgroup-v1	A fairly routine cycle for docs - lots of typo fixes, some new documents,	2019-03-09 09:56:17 -08:00
cma	…
connector	…
console	…
core-api	Merge branch 'akpm' (patches from Andrew)	2019-03-12 10:39:53 -07:00
cpu-freq	Documentation: cpu-freq: Frequencies aren't always sorted	2018-11-07 13:29:04 +01:00
crypto	crypto: skcipher - remove remnants of internal IV generators	2018-12-23 11:52:45 +08:00
dev-tools	Documentation/dev-tools: Use gcc version number instead svn revision number	2019-01-14 17:25:41 -07:00
device-mapper	dm cache: add support for discard passdown to the origin device	2019-03-05 14:53:52 -05:00
devicetree	dt-bindings: add an explanation for internal phy-mode	2019-04-21 11:24:08 -07:00
doc-guide	docs: kernel-doc: typo "if ... if" -> "if ... is"	2019-02-17 15:38:47 -07:00
driver-api	dmaengine updates for v5.1-rc1	2019-03-14 09:11:54 -07:00
driver-model	Merge branches 'clk-optional', 'clk-devm-clkdev-register', 'clk-allwinner', 'clk-meson' and 'clk-renesas' into clk-next	2019-03-08 10:27:21 -08:00
early-userspace	Correct gen_init_cpio tool's documentation	2018-11-25 12:25:53 -07:00
extcon	…
fault-injection	doc: fault-injection: fix macro name in example	2019-01-07 15:36:11 -07:00
fb	fbdev: fbmem: convert CONFIG_FB_LOGO_CENTER into a cmd line option	2019-01-16 17:42:35 +01:00
features	Documentation/features: Add csky kernel features	2019-01-07 22:22:16 +08:00
filesystems	vfs: Update mount API docs	2019-03-28 08:54:20 -07:00
firmware_class	…
fmc	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
fpga	…
gpio	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
gpu	Merge drm/drm-next into drm-misc-next	2019-02-11 10:35:35 +01:00
hid	HID: doc: fix wrong data structure reference for UHID_OUTPUT	2018-12-18 14:55:22 +01:00
hwmon	A fairly routine cycle for docs - lots of typo fixes, some new documents,	2019-03-09 09:56:17 -08:00
i2c	i2c: i801: Add support for Intel Comet Lake	2019-03-20 17:42:23 +01:00
ia64	…
ide	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
iio	…
infiniband	Documentation/infiniband: update from locked to pinned_vm	2019-02-07 12:56:23 -07:00
input	doc: Change LXR references to elixir.bootlin.com	2019-02-01 16:05:03 -07:00
interconnect	interconnect: Add generic on-chip interconnect API	2019-01-22 13:37:25 +01:00
ioctl	seccomp: add a return code to trap to userspace	2018-12-11 16:28:41 -08:00
isdn	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
kbuild	kbuild: force all architectures except um to include mandatory-y	2019-03-17 12:56:32 +09:00
kdump	kdump: Document kernel data exported in the vmcoreinfo note	2019-01-15 11:05:28 +01:00
kernel-hacking	…
laptops	Documentation: fix lg-laptop.rst warnings	2019-02-11 08:27:47 -07:00
leds	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
lightnvm	…
livepatch	livepatch: Remove signal sysfs attribute	2019-01-16 22:09:33 +01:00
locking	Documentation/locking/lockdep: Drop last two chars of sample states	2019-03-04 12:55:18 -07:00
m68k	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
maintainer	…
md	…
media	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2019-04-19 10:28:27 -07:00
memory-devices	…
mic	…
mips	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
misc-devices	Documentation: add ibmvmc to toctree(index) and fix warnings	2019-01-14 08:37:17 -07:00
mmc	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
mtd	Documentation: mtd: remove stale pxa3xx NAND controller documentation	2018-09-04 23:37:38 +02:00
namespaces	…
netlabel	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
networking	Documentation: decnet: remove reference to CONFIG_DECNET_ROUTE_FWMARK	2019-04-21 11:25:11 -07:00
nfc	…
nios2	…
nvdimm	libnvdimm/security: Add documentation for nvdimm security support	2018-12-21 12:44:41 -08:00
nvmem	Documentation: nvmem: document cell tables and lookup entries	2018-09-28 15:14:54 +02:00
openrisc	…
parisc	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
pcmcia	pcmcia: remove long deprecated pcmcia_request_exclusive_irq() function	2018-08-18 12:30:42 -07:00
perf	Documentation: perf: Add documentation for ThunderX2 PMU uncore driver	2018-12-06 12:29:47 +00:00
phy	…
platform	…
power	PM/EM: Document the Energy Model framework	2019-01-27 12:29:37 +01:00
powerpc	powerpc/fadump: Reservationless firmware assisted dump	2018-12-21 11:32:49 +11:00
pps	…
process	A fairly routine cycle for docs - lots of typo fixes, some new documents,	2019-03-09 09:56:17 -08:00
pti	…
ptp	…
rapidio	…
riscv	…
s390	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
scheduler	sched/doc: Document Energy Aware Scheduling	2019-01-27 12:29:37 +01:00
scsi	scsi: ufs-bsg: Allow reading descriptors	2019-02-27 09:00:02 -05:00
security	doc: security: Add kern-doc for lsm_hooks.h	2019-02-22 08:54:09 -07:00
serial	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
sh	sh: remove board_time_init() callback	2018-12-18 16:13:04 +01:00
sound	ASoC: More changes for v5.1	2019-02-28 13:30:55 +01:00
sparc	…
sphinx	…
sphinx-static	docs: improve readability for people with poorer eyesight	2018-10-07 09:16:50 -06:00
spi	pxa2xx: replace spi_master with spi_controller	2019-01-23 10:59:56 +00:00
sysctl	mm: do not boost watermarks to avoid fragmentation for the DISCONTIG memory model	2019-04-26 09:18:05 -07:00
target	scsi: target/core: Remove the write_pending_status() callback function	2019-02-04 21:23:59 -05:00
thermal	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
timers	Docs: Correct /proc/stat path	2019-02-22 08:50:17 -07:00
trace	doc: trace: Fix documentation for uprobe_profile	2019-02-21 10:28:55 -05:00
translations	A fairly routine cycle for docs - lots of typo fixes, some new documents,	2019-03-09 09:56:17 -08:00
usb	usb: core: add option of only authorizing internal devices	2019-02-22 09:27:55 +01:00
userspace-api	x86/speculation: Add PR_SPEC_DISABLE_NOEXEC	2019-01-29 22:11:49 +01:00
virtual	Documentation: kvm: clarify KVM_SET_USER_MEMORY_REGION	2019-03-28 17:30:11 +01:00
vm	docs: Use underscore not hyphen in label	2019-02-01 16:04:01 -07:00
w1	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00
watchdog	Documentation/watchdog: Add documentation mlx-wdt driver	2019-03-02 15:28:20 +01:00
wimax	…
x86	x86/resctrl: Avoid confusion over the new X86_RESCTRL config	2019-02-02 10:34:52 +01:00
xilinx	Documentation: xilinx: Add documentation for eemi APIs	2018-10-09 13:26:05 +02:00
xtensa	xtensa: document boot parameter passing	2019-02-03 18:06:19 -08:00
.gitignore	…
Changes	…
CodingStyle	…
DMA-API-HOWTO.txt	Documentation/DMA-API-HOWTO: update dma_mask sections	2019-02-20 07:29:47 -07:00
DMA-API.txt	virtio: fixes, cleanups	2019-03-10 12:47:57 -07:00
DMA-ISA-LPC.txt	Documentation/DMA-ISA-LPC: fix an incorrect reference	2019-02-11 08:23:07 -07:00
DMA-attributes.txt	…
IPMI.txt	…
IRQ-affinity.txt	…
IRQ-domain.txt	…
IRQ.txt	…
Intel-IOMMU.txt	…
Makefile	kbuild: Add support for DT binding schema checks	2018-12-13 09:41:32 -06:00
SAK.txt	…
SM501.txt	…
SubmittingPatches	…
atomic_bitops.txt	…
atomic_t.txt	…
bt8xxgpio.txt	…
btmrvl.txt	…
bus-virt-phys-mapping.txt	…
clearing-warn-once.txt	…
conf.py	This is a fairly typical cycle for documentation. There's some welcome	2018-10-24 18:01:11 +01:00
cpu-load.txt	…
cputopology.txt	…
crc32.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	…
digsig.txt	…
docutils.conf	…
dontdiff	kernel/configs: use .incbin directive to embed config_data.gz	2019-03-07 18:32:02 -08:00
efi-stub.txt	efi_stub: update documentation on dtb= parameter	2018-09-09 14:46:44 -06:00
eisa.txt	…
futex-requeue-pi.txt	…
gcc-plugins.txt	…
highuid.txt	…
hw_random.txt	…
hwspinlock.txt	…
index.rst	Documentation: add ibmvmc to toctree(index) and fix warnings	2019-01-14 08:37:17 -07:00
intel_txt.txt	…
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isa.txt	…
isapnp.txt	…
kernel-per-CPU-kthreads.txt	doc: Update removal of RCU-bh/sched update machinery	2018-08-30 10:59:48 -07:00
kobject.txt	kref/kobject: Improve documentation	2018-12-06 13:57:03 +01:00
kprobes.txt	…
kref.txt	…
ldm.txt	…
lockup-watchdogs.txt	…
logo.gif	…
logo.txt	…
lsm.txt	…
lzo.txt	lib/lzo: fix bugs for very short or empty input	2019-04-05 16:02:30 -10:00
mailbox.txt	…
memory-barriers.txt	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
men-chameleon-bus.txt	…
nommu-mmap.txt	…
ntb.txt	…
numastat.txt	…
padata.txt	…
parport-lowlevel.txt	…
percpu-rw-semaphore.txt	…
phy.txt	…
pi-futex.txt	…
pnp.txt	…
preempt-locking.txt	Documentation: preempt-locking: Use better example	2018-10-12 11:35:47 -06:00
pwm.txt	…
rbtree.txt	…
remoteproc.txt	…
rfkill.txt	…
robust-futex-ABI.txt	…
robust-futexes.txt	…
rpmsg.txt	…
rtc.txt	…
sgi-ioc4.txt	…
siphash.txt	…
smsc_ece1099.txt	…
speculation.txt	…
static-keys.txt	static_keys.txt: Fix trivial spelling mistake	2019-02-06 16:44:16 -07:00
svga.txt	…
switchtec.txt	NTB: switchtec_ntb: Update switchtec documentation with prerequisites for NTB	2018-10-11 11:28:53 -05:00
sync_file.txt	…
tee.txt	…
this_cpu_ops.txt	…
unaligned-memory-access.txt	…
vfio-mediated-device.txt	…
vfio.txt	…
video-output.txt	…
xillybus.txt	…
xz.txt	…
zorro.txt	…