Centos-kernel-stream-9/include/linux
Johannes Weiner 7b785645e8 mm: fix page cache convergence regression
Since a283348629 ("page cache: Finish XArray conversion"), on most
major Linux distributions, the page cache doesn't correctly transition
when the hot data set is changing, and leaves the new pages thrashing
indefinitely instead of kicking out the cold ones.

On a freshly booted, freshly ssh'd into virtual machine with 1G RAM
running stock Arch Linux:

[root@ham ~]# ./reclaimtest.sh
+ dd of=workingset-a bs=1M count=0 seek=600
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ ./mincore workingset-a
153600/153600 workingset-a
+ dd of=workingset-b bs=1M count=0 seek=600
+ cat workingset-b
+ cat workingset-b
+ cat workingset-b
+ cat workingset-b
+ ./mincore workingset-a workingset-b
104029/153600 workingset-a
120086/153600 workingset-b
+ cat workingset-b
+ cat workingset-b
+ cat workingset-b
+ cat workingset-b
+ ./mincore workingset-a workingset-b
104029/153600 workingset-a
120268/153600 workingset-b

workingset-b is a 600M file on a 1G host that is otherwise entirely
idle. No matter how often it's being accessed, it won't get cached.

While investigating, I noticed that the non-resident information gets
aggressively reclaimed - /proc/vmstat::workingset_nodereclaim. This is
a problem because a workingset transition like this relies on the
non-resident information tracked in the page cache tree of evicted
file ranges: when the cache faults are refaults of recently evicted
cache, we challenge the existing active set, and that allows a new
workingset to establish itself.

Tracing the shrinker that maintains this memory revealed that all page
cache tree nodes were allocated to the root cgroup. This is a problem,
because 1) the shrinker sizes the amount of non-resident information
it keeps to the size of the cgroup's other memory and 2) on most major
Linux distributions, only kernel threads live in the root cgroup and
everything else gets put into services or session groups:

[root@ham ~]# cat /proc/self/cgroup
0::/user.slice/user-0.slice/session-c1.scope

As a result, we basically maintain no non-resident information for the
workloads running on the system, thus breaking the caching algorithm.

Looking through the code, I found the culprit in the above-mentioned
patch: when switching from the radix tree to xarray, it dropped the
__GFP_ACCOUNT flag from the tree node allocations - the flag that
makes sure the allocated memory gets charged to and tracked by the
cgroup of the calling process - in this case, the one doing the fault.

To fix this, allow xarray users to specify per-tree flag that makes
xarray allocate nodes using __GFP_ACCOUNT. Then restore the page cache
tree annotation to request such cgroup tracking for the cache nodes.

With this patch applied, the page cache correctly converges on new
workingsets again after just a few iterations:

[root@ham ~]# ./reclaimtest.sh
+ dd of=workingset-a bs=1M count=0 seek=600
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ cat workingset-a
+ ./mincore workingset-a
153600/153600 workingset-a
+ dd of=workingset-b bs=1M count=0 seek=600
+ cat workingset-b
+ ./mincore workingset-a workingset-b
124607/153600 workingset-a
87876/153600 workingset-b
+ cat workingset-b
+ ./mincore workingset-a workingset-b
81313/153600 workingset-a
133321/153600 workingset-b
+ cat workingset-b
+ ./mincore workingset-a workingset-b
63036/153600 workingset-a
153600/153600 workingset-b

Cc: stable@vger.kernel.org # 4.20+
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
2019-05-31 13:52:41 -04:00
..
amba
avf
bcma
byteorder
can
ceph
clk
crush
decompress
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dsa
extcon
firmware
fpga
fsl
gpio
hsi
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iio
input
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lockd
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mlx4
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mmc
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mux
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perf
phy
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power
qed
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remoteproc
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adb.h
adfs_fs.h
adxl.h
aer.h
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agpgart.h
ahci-remap.h
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aio.h
alarmtimer.h
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apple-gmux.h
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async.h
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ata.h
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atalk.h
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atm.h
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atomic.h
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audit.h
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auxvec.h
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badblocks.h
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bch.h
bcm47xx_nvram.h
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bcm963xx_nvram.h
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binfmts.h
bio.h
bit_spinlock.h
bitfield.h
bitmap.h
bitops.h
bitrev.h
bits.h
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blk-mq-virtio.h
blk-mq.h
blk-pm.h
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blkdev.h
blkpg.h
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bottom_half.h
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bpfilter.h
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bsg.h
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btree-128.h
btree-type.h
btree.h
btrfs.h
buffer_head.h
bug.h
build-salt.h
build_bug.h
bvec.h
c2port.h
cache.h
cacheinfo.h
capability.h
cb710.h
cciss_ioctl.h
ccp.h
cdev.h
cdrom.h
cfag12864b.h
cgroup-defs.h
cgroup.h
cgroup_rdma.h
cgroup_subsys.h
circ_buf.h
cleancache.h
clk-provider.h
clk.h
clkdev.h
clock_cooling.h
clockchips.h
clocksource.h
cm4000_cs.h
cma.h
cmdline-parser.h
cn_proc.h
cnt32_to_63.h
coda.h
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compaction.h
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completion.h
component.h
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configfs.h
connector.h
console.h
console_struct.h
consolemap.h
const.h
container.h
context_tracking.h
context_tracking_state.h
cordic.h
coredump.h
coresight-pmu.h
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coresight.h
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counter.h
counter_enum.h
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crc32c.h
crc32poly.h
crc64.h
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cryptohash.h
cs5535.h
ctype.h
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dax.h
dca.h
dcache.h
dccp.h
dcookies.h
debug_locks.h
debugfs.h
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delay.h
delayacct.h
delayed_call.h
devcoredump.h
devfreq-event.h
devfreq.h
devfreq_cooling.h
device-mapper.h
device.h
device_cgroup.h
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digsig.h
dio.h
dirent.h
dlm.h
dlm_plock.h
dm-bufio.h
dm-dirty-log.h
dm-io.h
dm-kcopyd.h
dm-region-hash.h
dm9000.h
dma-buf.h
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dma-debug.h
dma-direct.h
dma-direction.h
dma-fence-array.h
dma-fence-chain.h
dma-fence.h
dma-iommu.h
dma-mapping.h
dma-noncoherent.h
dmaengine.h
dmapool.h
dmar.h
dmi.h
dnotify.h
dns_resolver.h
dqblk_qtree.h
dqblk_v1.h
dqblk_v2.h
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drbd_genl.h
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drbd_limits.h
ds2782_battery.h
dtlk.h
dw_apb_timer.h
dynamic_debug.h
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earlycpio.h
ecryptfs.h
edac.h
edd.h
edma.h
eeprom_93cx6.h
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efi-bgrt.h
efi.h
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eisa.h
elevator.h
elf-fdpic.h
elf-randomize.h
elf.h
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elfcore.h
elfnote.h
enclosure.h
energy_model.h
err.h
errno.h
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etherdevice.h
ethtool.h net: ethtool: Document get_rxfh_context and set_rxfh_context ethtool ops 2019-05-25 16:33:36 -07:00
eventfd.h
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evm.h
export.h
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f75375s.h
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fb.h
fbcon.h
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fcntl.h
fd.h
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fdtable.h
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file.h
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firewire.h
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firmware.h
fixp-arith.h
flat.h
flex_proportions.h
fmc-sdb.h
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font.h
frame.h
freezer.h
frontswap.h
fs.h
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fs_enet_pd.h
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fs_pin.h
fs_stack.h
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fs_uart_pd.h
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fscache.h
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fsi.h
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fsl_devices.h
fsl_hypervisor.h
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fsnotify.h
fsnotify_backend.h
ftrace.h
ftrace_irq.h
futex.h
fwnode.h
gameport.h
gcd.h
genalloc.h
generic-radix-tree.h
genetlink.h
genhd.h
genl_magic_func.h
genl_magic_struct.h
getcpu.h
gfp.h
glob.h
gnss.h
goldfish.h
gpio-pxa.h
gpio.h
gpio_keys.h
hardirq.h
hash.h
hashtable.h
hdlc.h
hdlcdrv.h
hdmi.h
hid-debug.h
hid-roccat.h
hid-sensor-hub.h
hid-sensor-ids.h
hid.h
hiddev.h
hidraw.h
highmem.h
highuid.h
hil.h
hil_mlc.h
hippidevice.h
hmm.h
host1x.h
hp_sdc.h
hpet.h
hrtimer.h
htcpld.h
huge_mm.h
hugetlb.h
hugetlb_cgroup.h
hugetlb_inline.h
hw_breakpoint.h
hw_random.h
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hwmon.h
hwspinlock.h
hyperv.h
hypervisor.h
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i2c-algo-pca.h
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i2c-dev.h
i2c-mux.h
i2c-pxa.h
i2c-smbus.h
i2c.h
i8042.h
i8253.h
icmp.h
icmpv6.h
ide.h
idle_inject.h
idr.h
ieee80211.h
ieee802154.h
if_arp.h
if_bridge.h
if_eql.h
if_ether.h
if_fddi.h
if_frad.h
if_link.h
if_ltalk.h
if_macvlan.h
if_phonet.h
if_pppol2tp.h
if_pppox.h
if_tap.h
if_team.h
if_tun.h
if_tunnel.h
if_vlan.h
igmp.h
ihex.h
ima.h
imx-media.h
in.h
in6.h
indirect_call_wrapper.h
inet.h
inet_diag.h
inetdevice.h
init.h
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init_task.h
initrd.h
inotify.h
input-polldev.h
input.h
integrity.h
intel-iommu.h
intel-ish-client-if.h
intel-pti.h
intel-svm.h
interconnect-provider.h
interconnect.h
interrupt.h
interval_tree.h
interval_tree_generic.h
io-64-nonatomic-hi-lo.h
io-64-nonatomic-lo-hi.h
io-mapping.h
io-pgtable.h
io.h
ioc3.h
ioc4.h
iocontext.h
iomap.h
iommu-helper.h
iommu.h
iopoll.h
ioport.h
ioprio.h
iova.h
ip.h
ipack.h
ipc.h
ipc_namespace.h
ipmi-fru.h
ipmi.h
ipmi_smi.h
ipv6.h
ipv6_route.h
irq.h
irq_cpustat.h
irq_poll.h
irq_sim.h
irq_work.h
irqbypass.h
irqchip.h
irqdesc.h
irqdomain.h
irqflags.h
irqhandler.h
irqnr.h
irqreturn.h
isa.h
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iscsi_ibft.h
isdn.h
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isdn_ppp.h
isdnif.h
isicom.h
iversion.h
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jhash.h
jiffies.h
journal-head.h
joystick.h
jump_label.h
jump_label_ratelimit.h
jz4740-adc.h
jz4780-nemc.h
kallsyms.h
kasan-checks.h
kasan.h
kbd_diacr.h
kbd_kern.h
kbuild.h
kconfig.h
kcore.h
kcov.h
kd.h
kdb.h
kdebug.h
kdev_t.h
kern_levels.h
kernel-page-flags.h
kernel.h
kernel_stat.h
kernelcapi.h
kernfs.h
kexec.h
key-type.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
key.h
keyboard.h
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kgdb.h
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klist.h
kmemleak.h
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kmsg_dump.h
kobj_map.h
kobject.h
kobject_ns.h
kprobes.h
kref.h
ks0108.h
ks8842.h
ks8851_mll.h
ksm.h
kthread.h
ktime.h
kvm_host.h
kvm_irqfd.h
kvm_para.h
kvm_types.h
l2tp.h
lantiq.h
lapb.h
latencytop.h
lcd.h
lcm.h
led-class-flash.h
led-lm3530.h
leds-bd2802.h
leds-lp3944.h
leds-lp3952.h
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leds-tca6507.h
leds.h
leds_pwm.h
libata.h
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libfdt_env.h
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libnvdimm.h
libps2.h
license.h
lightnvm.h
limits.h
linkage.h
linkmode.h
linux_logo.h
lis3lv02d.h
list.h
list_bl.h
list_lru.h
list_nulls.h
list_sort.h
livepatch.h
llc.h
llist.h
lockdep.h
lockref.h
log2.h
logic_pio.h
lp.h
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lsm_audit.h
lsm_hooks.h
lz4.h
lzo.h
mISDNdsp.h
mISDNhw.h
mISDNif.h
mailbox_client.h
mailbox_controller.h
maple.h
marvell_phy.h
math64.h
max17040_battery.h
mbcache.h
mbus.h
mc6821.h
mc146818rtc.h
mcb.h
mdev.h
mdio-bitbang.h
mdio-gpio.h
mdio-mux.h
mdio.h
mei_cl_bus.h
mem_encrypt.h
memblock.h
memcontrol.h
memfd.h
memory.h
memory_hotplug.h
mempolicy.h
mempool.h
memremap.h
memstick.h
mic_bus.h
micrel_phy.h
microchipphy.h
migrate.h
migrate_mode.h
mii.h
miscdevice.h
mm-arch-hooks.h
mm.h
mm_inline.h
mm_types.h
mm_types_task.h
mman.h
mmdebug.h
mmiotrace.h
mmu_context.h
mmu_notifier.h
mmzone.h
mnt_namespace.h
mod_devicetable.h
module.h
moduleloader.h
moduleparam.h
mount.h
mpage.h
mpi.h
mpls.h
mpls_iptunnel.h
mroute.h
mroute6.h
mroute_base.h
msdos_fs.h
msg.h
msi.h
mutex.h
mv643xx.h
mv643xx_eth.h
mv643xx_i2c.h
mvebu-pmsu.h
mxm-wmi.h
n_r3964.h
namei.h
nd.h
ndctl.h
net.h
net_dim.h
netdev_features.h
netdevice.h
netfilter.h
netfilter_bridge.h
netfilter_defs.h
netfilter_ingress.h
netfilter_ipv4.h
netfilter_ipv6.h
netlink.h
netpoll.h
nfs.h
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nfs_iostat.h
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nfsacl.h
nl802154.h
nls.h
nmi.h
node.h
nodemask.h
nospec.h
notifier.h
ns_common.h
nsc_gpio.h
nsproxy.h
ntb.h
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nubus.h
numa.h
nvme-fc-driver.h
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nvme-tcp.h
nvme.h
nvmem-consumer.h
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nvram.h
objagg.h
of.h
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of_platform.h
of_reserved_mem.h
oid_registry.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
olpc-ec.h
omap-dma.h
omap-dmaengine.h
omap-gpmc.h
omap-iommu.h
omap-mailbox.h
omapfb.h
once.h
oom.h
openvswitch.h
oprofile.h
osq_lock.h
overflow.h
oxu210hp.h
packing.h
padata.h
page-flags-layout.h
page-flags.h
page-isolation.h
page_counter.h
page_ext.h
page_idle.h
page_owner.h
page_ref.h
pageblock-flags.h
pagemap.h
pagevec.h
parman.h
parport.h
parport_pc.h
parser.h
pata_arasan_cf_data.h
patchkey.h
path.h
pch_dma.h
pci-acpi.h
pci-aspm.h
pci-ats.h
pci-dma-compat.h
pci-ecam.h
pci-ep-cfs.h
pci-epc.h
pci-epf.h
pci-p2pdma.h
pci.h
pci_hotplug.h
pci_ids.h
pda_power.h
pe.h
percpu-defs.h
percpu-refcount.h
percpu-rwsem.h
percpu.h
percpu_counter.h
perf_event.h
perf_regs.h
personality.h
pfn.h
pfn_t.h
phonet.h
phy.h
phy_fixed.h
phy_led_triggers.h
phylink.h
pid.h
pid_namespace.h
pim.h
pipe_fs_i.h
pkeys.h
pktcdvd.h
pl320-ipc.h
pl353-smc.h
platform_device.h
plist.h
pm-trace.h
pm.h
pm2301_charger.h
pm_clock.h
pm_domain.h
pm_opp.h
pm_qos.h
pm_runtime.h
pm_wakeirq.h
pm_wakeup.h
pmbus.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
pmu.h
pnfs_osd_xdr.h
pnp.h
poison.h
poll.h
posix-clock.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
posix-timers.h
posix_acl.h
posix_acl_xattr.h
power_supply.h
powercap.h
ppp-comp.h
ppp_channel.h
ppp_defs.h
pps-gpio.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
pps_kernel.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
pr.h
preempt.h
prefetch.h
prime_numbers.h
printk.h
proc_fs.h
proc_ns.h
processor.h
profile.h
projid.h
property.h
psci.h
psi.h
psi_types.h
psp-sev.h
pstore.h
pstore_ram.h
pti.h
ptp_classify.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
ptp_clock_kernel.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
ptr_ring.h
ptrace.h
purgatory.h
pvclock_gtod.h
pwm.h
pwm_backlight.h
pxa2xx_ssp.h
pxa168_eth.h
qcom-geni-se.h
qcom_scm.h
qnx6_fs.h
quicklist.h
quota.h
quotaops.h
radix-tree.h
raid_class.h
ramfs.h
random.h
range.h
ras.h
ratelimit.h
rational.h
rbtree.h
rbtree_augmented.h
rbtree_latch.h
rcu_node_tree.h
rcu_segcblist.h
rcu_sync.h
rculist.h
rculist_bl.h
rculist_nulls.h
rcupdate.h
rcupdate_wait.h
rcutiny.h
rcutree.h
rcuwait.h
reboot-mode.h
reboot.h
reciprocal_div.h
refcount.h
regmap.h
regset.h
relay.h
remoteproc.h
reservation.h
reset-controller.h
reset.h
resource.h
resource_ext.h
restart_block.h
rfkill.h
rhashtable-types.h
rhashtable.h
ring_buffer.h
rio.h
rio_drv.h
rio_ids.h
rio_regs.h
rmap.h
rmi.h
rndis.h
rodata_test.h
root_dev.h
rpmsg.h
rslib.h
rtc.h
rtmutex.h
rtnetlink.h
rtsx_common.h
rtsx_pci.h
rtsx_usb.h
rwlock.h
rwlock_api_smp.h
rwlock_types.h
rwsem.h
s3c_adc_battery.h
sbitmap.h
scatterlist.h
scc.h
sched.h
sched_clock.h
scif.h
scmi_protocol.h
scpi_protocol.h
screen_info.h
sctp.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104 2019-05-24 17:39:00 +02:00
scx200.h
scx200_gpio.h
sdb.h
sdla.h
seccomp.h
securebits.h
security.h
sed-opal.h
seg6.h
seg6_genl.h
seg6_hmac.h
seg6_iptunnel.h
seg6_local.h
selection.h
sem.h
semaphore.h
seq_buf.h
seq_file.h
seq_file_net.h
seqlock.h
seqno-fence.h
serdev.h
serial.h
serial_8250.h
serial_bcm63xx.h
serial_core.h
serial_max3100.h
serial_pnx8xxx.h
serial_s3c.h
serial_sci.h
serio.h
set_memory.h
sfi.h
sfi_acpi.h
sfp.h
sh_clk.h
sh_dma.h
sh_eth.h
sh_intc.h
sh_timer.h
sha256.h
shdma-base.h
shm.h
shmem_fs.h
shrinker.h
signal.h
signal_types.h
signalfd.h
siox.h
siphash.h
sirfsoc_dma.h
sizes.h
skb_array.h
skbuff.h
skmsg.h
slab.h
slab_def.h
slimbus.h
slub_def.h
sm501-regs.h
sm501.h
smc91x.h
smc911x.h
smp.h
smpboot.h
smsc911x.h
smscphy.h
sock_diag.h
socket.h
sonet.h
sony-laptop.h
sonypi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
sort.h
sound.h
soundcard.h
spinlock.h
spinlock_api_smp.h
spinlock_api_up.h
spinlock_types.h
spinlock_types_up.h
spinlock_up.h
splice.h
spmi.h
sram.h
srcu.h
srcutiny.h
srcutree.h
ssbi.h
stackdepot.h
stackleak.h
stackprotector.h
stacktrace.h
start_kernel.h
stat.h
statfs.h
static_key.h
stddef.h
stm.h
stmmac.h
stmp3xxx_rtc_wdt.h
stmp_device.h
stop_machine.h
string.h
string_helpers.h
stringhash.h
stringify.h
sudmac.h
sungem_phy.h
sunserialcore.h
sunxi-rsb.h
superhyway.h
suspend.h
svga.h
sw842.h
swab.h
swait.h
swap.h
swap_cgroup.h
swap_slots.h
swapfile.h
swapops.h
swiotlb.h
switchtec.h
sxgbe_platform.h
sync_core.h
sync_file.h
synclink.h
sys.h
sys_soc.h
syscalls.h
syscore_ops.h
sysctl.h
sysfs.h
syslog.h
sysrq.h
sysv_fs.h
t10-pi.h
task_io_accounting.h
task_io_accounting_ops.h
task_work.h
taskstats_kern.h
tboot.h
tc.h
tca6416_keypad.h
tcp.h
tee_drv.h
textsearch.h
textsearch_fsm.h
tfrc.h
thermal.h
thread_info.h
threads.h
thunderbolt.h
ti-emif-sram.h
ti_wilink_st.h
tick.h
tifm.h
timb_dma.h
timb_gpio.h
time.h
time32.h
time64.h
timecounter.h
timekeeper_internal.h
timekeeping.h
timekeeping32.h
timer.h
timerfd.h
timeriomem-rng.h
timerqueue.h
timex.h
tnum.h
topology.h
torture.h
toshiba.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 118 2019-05-24 17:39:02 +02:00
tpm.h
tpm_command.h
tpm_eventlog.h
trace.h
trace_clock.h
trace_events.h
trace_seq.h
tracefs.h
tracehook.h
tracepoint-defs.h
tracepoint.h
transport_class.h
ts-nbus.h
tsacct_kern.h
tty.h
tty_driver.h
tty_flip.h
tty_ldisc.h
typecheck.h
types.h
u64_stats_sync.h
uaccess.h
ucb1400.h
ucs2_string.h
udp.h
uidgid.h
uio.h
uio_driver.h
umh.h
unicode.h
uprobes.h
usb.h
usb_usual.h
usbdevice_fs.h
user-return-notifier.h
user.h
user_namespace.h
userfaultfd_k.h
util_macros.h
uts.h
utsname.h
uuid.h
uwb.h
vbox_utils.h
verification.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
vermagic.h
vexpress.h
vfio.h
vfs.h
vga_switcheroo.h
vgaarb.h
via-core.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 50 2019-05-24 17:27:13 +02:00
via-gpio.h
via.h
via_i2c.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 50 2019-05-24 17:27:13 +02:00
videodev2.h
virtio.h
virtio_byteorder.h
virtio_caif.h
virtio_config.h
virtio_console.h
virtio_net.h
virtio_ring.h
virtio_vsock.h
visorbus.h
vlynq.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 102 2019-05-24 17:39:00 +02:00
vm_event_item.h
vm_sockets.h
vmacache.h
vmalloc.h
vme.h
vmpressure.h
vmstat.h
vmw_vmci_api.h
vmw_vmci_defs.h
vringh.h
vt.h
vt_buffer.h
vt_kern.h
vtime.h
w1-gpio.h
w1.h
wait.h
wait_bit.h
wanrouter.h
watchdog.h
win_minmax.h
wireless.h
wkup_m3_ipc.h
wl12xx.h
wm97xx.h
wmi.h
workqueue.h
writeback.h
ww_mutex.h
xarray.h mm: fix page cache convergence regression 2019-05-31 13:52:41 -04:00
xattr.h
xxhash.h
xz.h
yam.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 69 2019-05-24 17:36:47 +02:00
z2_battery.h
zbud.h
zconf.h
zlib.h
zorro.h
zpool.h
zsmalloc.h
zstd.h
zutil.h