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Chris Down 9852ae3fe5 mm, memcg: consider subtrees in memory.events 
memory.stat and other files already consider subtrees in their output, and
we should too in order to not present an inconsistent interface.

The current situation is fairly confusing, because people interacting with
cgroups expect hierarchical behaviour in the vein of memory.stat,
cgroup.events, and other files.  For example, this causes confusion when
debugging reclaim events under low, as currently these always read "0" at
non-leaf memcg nodes, which frequently causes people to misdiagnose breach
behaviour.  The same confusion applies to other counters in this file when
debugging issues.

Aggregation is done at write time instead of at read-time since these
counters aren't hot (unlike memory.stat which is per-page, so it does it
at read time), and it makes sense to bundle this with the file
notifications.

After this patch, events are propagated up the hierarchy:

    [root@ktst ~]# cat /sys/fs/cgroup/system.slice/memory.events
    low 0
    high 0
    max 0
    oom 0
    oom_kill 0
    [root@ktst ~]# systemd-run -p MemoryMax=1 true
    Running as unit: run-r251162a189fb4562b9dabfdc9b0422f5.service
    [root@ktst ~]# cat /sys/fs/cgroup/system.slice/memory.events
    low 0
    high 0
    max 7
    oom 1
    oom_kill 1

As this is a change in behaviour, this can be reverted to the old
behaviour by mounting with the `memory_localevents' flag set.  However, we
use the new behaviour by default as there's a lack of evidence that there
are any current users of memory.events that would find this change
undesirable.

akpm: this is a behaviour change, so Cc:stable.  THis is so that
forthcoming distros which use cgroup v2 are more likely to pick up the
revised behaviour.

Link: http://lkml.kernel.org/r/20190208224419.GA24772@chrisdown.name
Signed-off-by: Chris Down <chris@chrisdown.name>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2019-06-01 15:51:31 -07:00
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ABI Documentation: net-sysfs: Remove duplicate PHY device documentation 2019-05-28 17:26:44 -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 doc: Fix typos and otherwise modernize checklist.txt 2019-03-26 14:37:06 -07:00
accelerators
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accounting psi: introduce psi monitor 2019-05-14 19:52:48 -07:00
acpi/dsd LED updates for 5.2-rc1. 2019-05-07 18:02:51 -07:00
admin-guide mm, memcg: consider subtrees in memory.events 2019-06-01 15:51:31 -07:00
aoe
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arm ARM: 8833/1: Ensure that NEON code always compiles with Clang 2019-02-12 15:20:09 +00:00
arm64 arm64: Handle erratum 1418040 as a superset of erratum 1188873 2019-05-23 15:40:30 +01:00
auxdisplay
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backlight
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block block: null: Add documentation for "zone_nr_conv" param 2019-04-09 08:18:23 -06:00
blockdev zram: idle writeback fixes and cleanup 2019-01-08 17:15:10 -08:00
bpf bpf: btf: fix the brackets of BTF_INT_OFFSET() 2019-05-14 10:05:18 +02:00
bus-devices
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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
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connector
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console Documentation: corrections to console/console.txt 2018-08-10 16:09:40 -06:00
core-api lib: Move mathematic helpers to separate folder 2019-05-14 19:52:49 -07:00
cpu-freq Documentation: cpu-freq: Frequencies aren't always sorted 2018-11-07 13:29:04 +01:00
crypto crypto: shash - remove shash_desc::flags 2019-04-25 15:38:12 +08:00
dev-tools gcov: docs: add a note on GCC vs Clang differences 2019-05-14 19:52:51 -07:00
device-mapper dm integrity: add a bitmap mode 2019-05-08 13:41:58 -04:00
devicetree dt: bindings: mtd: replace references to nand.txt with nand-controller.yaml 2019-05-22 09:08:20 -05:00
doc-guide docs: doc-guide: remove the extension from .rst files 2019-04-19 12:46:27 -06:00
driver-api counter: fix Documentation build error due to incorrect source file name 2019-05-20 13:18:45 -06:00
driver-model i2c: core: add device-managed version of i2c_new_dummy 2019-05-17 19:29:40 +02:00
early-userspace Correct gen_init_cpio tool's documentation 2018-11-25 12:25:53 -07:00
extcon
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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 Merge branch 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2019-05-07 19:34:17 -07:00
filesystems autofs: add description of ignore pseudo mount option 2019-05-14 19:52:50 -07:00
firmware-guide docs: fix multiple doc build warnings in enumeration.rst 2019-05-23 09:27:39 -06:00
firmware_class
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fmc Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00
fpga docs: fpga: add a document for FPGA Device Feature List (DFL) Framework Overview 2018-07-15 13:55:44 +02:00
gpio docs: gpio: convert docs to ReST and rename to *.rst 2019-04-23 23:30:07 +02:00
gpu drm: add drm_format_helper.c to kerneldoc 2019-04-17 09:39:22 +02:00
hid HID: doc: fix wrong data structure reference for UHID_OUTPUT 2018-12-18 14:55:22 +01:00
hwmon hwmon: (lm75) Add support for TMP75B 2019-05-03 13:16:18 -07:00
i2c i2c-piix4: Add Hygon Dhyana SMBus support 2019-05-03 16:47:54 +02:00
ia64
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ide Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00
iio
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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: drop support for cc-ldoption 2019-05-21 00:02:59 +09:00
kdump Documentation: kdump: fix minor typo 2019-05-21 09:31:28 -06:00
kernel-hacking doc:it_IT: translation for kernel-hacking 2018-07-26 16:21:09 -06:00
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
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livepatch docs/livepatch: Unify style of livepatch documentation in the ReST format 2019-05-07 16:06:28 -06:00
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
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md
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media media updates for v5.2-rc1 2019-05-16 11:57:16 -07:00
memory-devices
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mic
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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
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netlabel Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00
networking Documentation: add TLS offload documentation 2019-05-22 12:18:20 -07:00
nfc
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nios2
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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
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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
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platform
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power PM/EM: Document the Energy Model framework 2019-01-27 12:29:37 +01:00
powerpc Documentation: powerpc: Expand the DAWR acronym 2019-05-03 02:54:58 +10:00
pps
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process A reasonably busy cycle for docs, including: 2019-05-08 12:42:50 -07:00
pti
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ptp
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rapidio
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riscv
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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 docs: serial: convert docs to ReST and rename to *.rst 2019-04-25 11:37:42 +02:00
sh sh: remove board_time_init() callback 2018-12-18 16:13:04 +01:00
sound ALSA: doc: my_chip has no element ioport 2019-04-03 11:55:47 +02:00
sparc docs: sparc: convert to ReST 2019-05-08 17:13:35 -07:00
sphinx doc: Cope with the deprecation of AutoReporter 2019-05-23 09:23:11 -06:00
sphinx-static docs: improve readability for people with poorer eyesight 2018-10-07 09:16:50 -06:00
spi spi-summary: document set_cs_timing 2019-04-08 14:13:43 +07:00
sysctl userfaultfd/sysctl: add vm.unprivileged_userfaultfd 2019-05-14 09:47:45 -07:00
target scsi: target/core: Remove the write_pending_status() callback function 2019-02-04 21:23:59 -05:00
thermal docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
timers Docs: Correct /proc/stat path 2019-02-22 08:50:17 -07:00
trace The major changes in this tracing update includes: 2019-05-15 16:05:47 -07:00
translations Some late arriving documentation changes. In particular, this contains the 2019-05-10 13:24:53 -04:00
usb USB: rio500: update Documentation 2019-05-21 10:11:19 +02:00
userspace-api Documentation: seccomp: unify list indentation 2019-03-18 12:00:28 -06:00
virtual * ARM: support for SVE and Pointer Authentication in guests, PMU improvements 2019-05-17 10:33:30 -07:00
vm mm: fix Documentation/vm/hmm.rst Sphinx warnings 2019-06-01 15:51:31 -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
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x86 x86/speculation/mds: Improve CPU buffer clear documentation 2019-05-16 09:05:12 +02:00
xilinx drivers: Defer probe if firmware is not ready 2019-03-18 13:45:27 +01:00
xtensa xtensa: document boot parameter passing 2019-02-03 18:06:19 -08:00
.gitignore
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Changes
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CodingStyle
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DMA-API-HOWTO.txt DMA mapping updates for 5.2 2019-05-09 08:40:55 -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
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IPMI.txt
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IRQ-affinity.txt
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IRQ-domain.txt
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IRQ.txt
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Intel-IOMMU.txt
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Makefile docs: Makefile: use latexmk if available 2019-04-01 14:33:42 -06:00
SAK.txt
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SM501.txt
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SubmittingPatches
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atomic_bitops.txt docs: atomic_bitops.txt: add a title for this document 2019-04-11 12:37:02 -06:00
atomic_t.txt Documentation/atomic_t: Clarify signed vs unsigned 2019-03-18 10:27:52 -07:00
bt8xxgpio.txt
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btmrvl.txt
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bus-virt-phys-mapping.txt
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clearing-warn-once.txt A reasonably busy cycle for docs, including: 2019-05-08 12:42:50 -07:00
conf.py docs: Fix conf.py for Sphinx 2.0 2019-05-24 09:09:32 -06:00
cpu-load.txt
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cputopology.txt topology: Simplify cputopology.txt formatting and wording 2019-04-19 10:56:04 +02:00
crc32.txt
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dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt
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dell_rbu.txt
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digsig.txt
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docutils.conf
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dontdiff A reasonably busy cycle for docs, including: 2019-05-08 12:42:50 -07:00
efi-stub.txt efi_stub: update documentation on dtb= parameter 2018-09-09 14:46:44 -06:00
eisa.txt
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futex-requeue-pi.txt
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gcc-plugins.txt
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highuid.txt
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hw_random.txt
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hwspinlock.txt
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index.rst Merge branch 'x86-mds-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-05-14 07:57:29 -07:00
intel_txt.txt
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io-mapping.txt
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io_ordering.txt
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iostats.txt block: Track DISCARD statistics and output them in stat and diskstat 2018-07-18 08:44:22 -06:00
irqflags-tracing.txt
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isa.txt
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isapnp.txt
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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 Merge branch 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2019-05-07 19:34:17 -07:00
kref.txt
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ldm.txt
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lockup-watchdogs.txt
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logo.gif
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logo.txt
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lsm.txt
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lzo.txt lib/lzo: fix bugs for very short or empty input 2019-04-05 16:02:30 -10:00
mailbox.txt
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memory-barriers.txt docs/memory-barriers.txt: Update I/O section to be clearer about CPU vs thread 2019-04-23 13:34:17 +01:00
men-chameleon-bus.txt
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nommu-mmap.txt
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ntb.txt docs: ntb.txt: add blank lines to clean up some Sphinx warnings 2019-04-11 12:37:03 -06:00
numastat.txt
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packing.txt lib: Add support for generic packing operations 2019-05-03 10:49:17 -04:00
padata.txt
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parport-lowlevel.txt
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percpu-rw-semaphore.txt
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phy.txt
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pi-futex.txt
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pnp.txt
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preempt-locking.txt x86/fpu: Remove fpu__restore() 2019-04-09 19:27:42 +02:00
pwm.txt
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rbtree.txt
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remoteproc.txt
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rfkill.txt
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robust-futex-ABI.txt
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robust-futexes.txt futex: Update comments and docs about return values of arch futex code 2019-04-26 13:57:55 +01:00
rpmsg.txt
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rtc.txt Documentation: rtc: Correct location of rtctest.c 2019-03-25 10:34:55 -06:00
sgi-ioc4.txt
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siphash.txt
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smsc_ece1099.txt
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speculation.txt docs: speculation.txt: mark example blocks as such 2019-04-11 12:37:03 -06:00
static-keys.txt static_keys.txt: Fix trivial spelling mistake 2019-02-06 16:44:16 -07:00
svga.txt
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switchtec.txt NTB: switchtec_ntb: Update switchtec documentation with prerequisites for NTB 2018-10-11 11:28:53 -05:00
sync_file.txt
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tee.txt
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this_cpu_ops.txt
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unaligned-memory-access.txt docs: unaligned-memory-access.txt: use a lowercase title 2019-04-11 12:37:03 -06:00
vfio-mediated-device.txt
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vfio.txt
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video-output.txt docs: video-output.txt: convert it to ReST format 2019-04-11 12:37:03 -06:00
xillybus.txt
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xz.txt
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zorro.txt
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