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
..
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	…
RCU	doc: Fix typos and otherwise modernize checklist.txt	2019-03-26 14:37:06 -07:00
accelerators	…
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	…
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	…
backlight	…
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	…
cdrom	…
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	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	…
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	…
fmc	…
fpga	…
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	…
ide	…
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	…
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	…
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	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	…
maintainer	…
md	…
media	media updates for v5.2-rc1	2019-05-16 11:57:16 -07:00
memory-devices	…
mic	…
mips	…
misc-devices	Documentation: add ibmvmc to toctree(index) and fix warnings	2019-01-14 08:37:17 -07:00
mmc	…
mtd	…
namespaces	…
netlabel	…
networking	Documentation: add TLS offload documentation	2019-05-22 12:18:20 -07:00
nfc	…
nios2	…
nvdimm	libnvdimm/security: Add documentation for nvdimm security support	2018-12-21 12:44:41 -08:00
nvmem	…
openrisc	…
parisc	…
pcmcia	…
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	Documentation: powerpc: Expand the DAWR acronym	2019-05-03 02:54:58 +10:00
pps	…
process	A reasonably busy cycle for docs, including:	2019-05-08 12:42:50 -07:00
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	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	…
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	…
watchdog	Documentation/watchdog: Add documentation mlx-wdt driver	2019-03-02 15:28:20 +01:00
wimax	…
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	…
Changes	…
CodingStyle	…
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	…
IPMI.txt	…
IRQ-affinity.txt	…
IRQ-domain.txt	…
IRQ.txt	…
Intel-IOMMU.txt	…
Makefile	docs: Makefile: use latexmk if available	2019-04-01 14:33:42 -06:00
SAK.txt	…
SM501.txt	…
SubmittingPatches	…
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	…
btmrvl.txt	…
bus-virt-phys-mapping.txt	…
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	…
cputopology.txt	topology: Simplify cputopology.txt formatting and wording	2019-04-19 10:56:04 +02:00
crc32.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	…
digsig.txt	…
docutils.conf	…
dontdiff	A reasonably busy cycle for docs, including:	2019-05-08 12:42:50 -07:00
efi-stub.txt	…
eisa.txt	…
futex-requeue-pi.txt	…
gcc-plugins.txt	…
highuid.txt	…
hw_random.txt	…
hwspinlock.txt	…
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	…
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isa.txt	…
isapnp.txt	…
kernel-per-CPU-kthreads.txt	…
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	…
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	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	…
nommu-mmap.txt	…
ntb.txt	docs: ntb.txt: add blank lines to clean up some Sphinx warnings	2019-04-11 12:37:03 -06:00
numastat.txt	…
packing.txt	lib: Add support for generic packing operations	2019-05-03 10:49:17 -04:00
padata.txt	…
parport-lowlevel.txt	…
percpu-rw-semaphore.txt	…
phy.txt	…
pi-futex.txt	…
pnp.txt	…
preempt-locking.txt	x86/fpu: Remove fpu__restore()	2019-04-09 19:27:42 +02:00
pwm.txt	…
rbtree.txt	…
remoteproc.txt	…
rfkill.txt	…
robust-futex-ABI.txt	…
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	…
rtc.txt	Documentation: rtc: Correct location of rtctest.c	2019-03-25 10:34:55 -06:00
sgi-ioc4.txt	…
siphash.txt	…
smsc_ece1099.txt	…
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	…
switchtec.txt	…
sync_file.txt	…
tee.txt	…
this_cpu_ops.txt	…
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	…
vfio.txt	…
video-output.txt	docs: video-output.txt: convert it to ReST format	2019-04-11 12:37:03 -06:00
xillybus.txt	…
xz.txt	…
zorro.txt	…