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Shakeel Butt 1e577f970f mm, memcg: introduce memory.events.local 
The memory controller in cgroup v2 exposes memory.events file for each
memcg which shows the number of times events like low, high, max, oom
and oom_kill have happened for the whole tree rooted at that memcg.
Users can also poll or register notification to monitor the changes in
that file.  Any event at any level of the tree rooted at memcg will
notify all the listeners along the path till root_mem_cgroup.  There are
existing users which depend on this behavior.

However there are users which are only interested in the events
happening at a specific level of the memcg tree and not in the events in
the underlying tree rooted at that memcg.  One such use-case is a
centralized resource monitor which can dynamically adjust the limits of
the jobs running on a system.  The jobs can create their sub-hierarchy
for their own sub-tasks.  The centralized monitor is only interested in
the events at the top level memcgs of the jobs as it can then act and
adjust the limits of the jobs.  Using the current memory.events for such
centralized monitor is very inconvenient.  The monitor will keep
receiving events which it is not interested and to find if the received
event is interesting, it has to read memory.event files of the next
level and compare it with the top level one.  So, let's introduce
memory.events.local to the memcg which shows and notify for the events
at the memcg level.

Now, does memory.stat and memory.pressure need their local versions.  IMHO
no due to the no internal process contraint of the cgroup v2.  The
memory.stat file of the top level memcg of a job shows the stats and
vmevents of the whole tree.  The local stats or vmevents of the top level
memcg will only change if there is a process running in that memcg but v2
does not allow that.  Similarly for memory.pressure there will not be any
process in the internal nodes and thus no chance of local pressure.

Link: http://lkml.kernel.org/r/20190527174643.209172-1-shakeelb@google.com
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Chris Down <chris@chrisdown.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2019-07-12 11:05:43 -07:00
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ABI Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
EDID docs: EDID/HOWTO.txt: convert it and rename to howto.rst 2019-06-14 14:32:29 -06:00
PCI pci-v4.20-changes 2018-10-25 06:50:48 -07:00
RCU It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
accelerators docs: mark orphan documents as such 2019-06-08 13:42:11 -06:00
accounting psi: introduce psi monitor 2019-05-14 19:52:48 -07:00
acpi/dsd docs: fix broken documentation links 2019-06-08 13:42:13 -06:00
admin-guide mm, memcg: introduce memory.events.local 2019-07-12 11:05:43 -07:00
aoe docs: aoe: convert docs to ReST and rename to *.rst 2019-06-14 14:20:22 -06:00
arm docs: mark orphan documents as such 2019-06-08 13:42:11 -06:00
arm64 It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
auxdisplay
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backlight
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block for-5.3/block-20190708 2019-07-09 10:45:06 -07:00
blockdev zram: idle writeback fixes and cleanup 2019-01-08 17:15:10 -08:00
bpf Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
bus-devices
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cdrom docs: ide: convert docs to ReST and rename to *.rst 2019-06-14 14:21:18 -06:00
cgroup-v1 for-5.3/block-20190708 2019-07-09 10:45:06 -07:00
cma
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connector
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console
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core-api asm-generic, x86: add bitops instrumentation for KASAN 2019-07-12 11:05:42 -07:00
cpu-freq Documentation: cpu-freq: Frequencies aren't always sorted 2018-11-07 13:29:04 +01:00
crypto crypto: doc - Fix formatting of new crypto engine content 2019-07-03 22:13:12 +08:00
dev-tools docs: kmemleak: add more documentation details 2019-07-12 11:05:42 -07:00
device-mapper docs: convert docs to ReST and rename to *.rst 2019-06-14 14:21:04 -06:00
devicetree Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
doc-guide Doc : doc-guide : Fix a typo 2019-06-28 09:04:14 -06:00
driver-api Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
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
fault-injection It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
fb docs: fb: Add TER16x32 to the available font names 2019-06-20 13:55:20 -06:00
features Documentation/stackprotector: powerpc supports stack protector 2019-06-14 14:44:43 -06:00
filesystems Highlights: 2019-07-10 21:22:43 -07:00
firmware-guide It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
firmware_class
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fpga docs: fpga: convert docs to ReST and rename to *.rst 2019-06-14 14:21:15 -06:00
gpio docs: gpio: convert docs to ReST and rename to *.rst 2019-04-23 23:30:07 +02:00
gpu docs: mark orphan documents as such 2019-06-08 13:42:11 -06:00
hid docs: stop suggesting strlcpy 2019-06-20 14:08:49 -06:00
hwmon hwmon: (lm75) Add support for TMP75B 2019-05-03 13:16:18 -07:00
i2c docs: stop suggesting strlcpy 2019-06-20 14:08:49 -06:00
ia64
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ide docs: ide: convert docs to ReST and rename to *.rst 2019-06-14 14:21:18 -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 docs: mark orphan documents as such 2019-06-08 13:42:11 -06:00
ioctl seccomp: add a return code to trap to userspace 2018-12-11 16:28:41 -08:00
isdn isdn: remove isdn4linux 2019-05-31 11:13:10 +02:00
kbuild docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
kdump docs: kdump: convert docs to ReST and rename to *.rst 2019-06-14 14:21:24 -06:00
kernel-hacking docs: stop suggesting strlcpy 2019-06-20 14:08:49 -06:00
laptops It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
leds docs: leds: convert to ReST 2019-06-28 20:57:31 +02:00
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 locking/lockdep: Add explanation to lock usage rules in lockdep design doc 2019-06-03 11:55:48 +02:00
m68k
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maintainer docs: Add a document on repository management 2019-06-18 09:33:16 -06:00
md
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media media: doc-rst: Fix typos 2019-06-27 07:35:47 -04:00
memory-devices
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mic docs: mic: convert docs to ReST and rename to *.rst 2019-06-14 14:23:26 -06:00
mips
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misc-devices Documentation: add ibmvmc to toctree(index) and fix warnings 2019-01-14 08:37:17 -07:00
mmc
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mtd
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namespaces
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netlabel docs: netlabel: convert docs to ReST and rename to *.rst 2019-06-14 14:23:30 -06:00
networking Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
nfc
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nios2
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nvdimm Documentation: nvdimm: Fix typo 2019-06-07 11:39:04 -06:00
nvmem Documentation: nvmem: document cell tables and lookup entries 2018-09-28 15:14:54 +02:00
openrisc
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parisc
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pcmcia docs: pcmcia: convert docs to ReST and rename to *.rst 2019-06-14 14:23:35 -06:00
perf Documentation: perf: Add documentation for ThunderX2 PMU uncore driver 2018-12-06 12:29:47 +00:00
phy
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power PM/EM: Document the Energy Model framework 2019-01-27 12:29:37 +01:00
powerpc docs: kdump: convert docs to ReST and rename to *.rst 2019-06-14 14:21:24 -06:00
process Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
pti
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rapidio
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riscv docs: riscv: convert docs to ReST and rename to *.rst 2019-06-14 14:31:32 -06:00
s390 docs: s390: s390dbf: typos and formatting, update crash command 2019-07-05 13:42:24 +02:00
scheduler It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
scsi scsi: ufs-bsg: Allow reading descriptors 2019-02-27 09:00:02 -05:00
security Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -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 docs: automarkup.py: ignore exceptions when seeking for xrefs 2019-07-08 14:35:47 -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 It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
target docs: target: convert docs to ReST and rename to *.rst 2019-06-14 14:31:36 -06:00
thermal docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
timers docs: timers: convert docs to ReST and rename to *.rst 2019-06-14 14:31:48 -06:00
trace docs: trace: add a missing blank line 2019-06-20 14:05:46 -06:00
translations It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
usb USB: rio500: update Documentation 2019-05-21 10:11:19 +02:00
userspace-api Documentation: Add section about CPU vulnerabilities for Spectre 2019-06-26 11:42:41 -06:00
virtual It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
vm It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
w1
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watchdog docs: watchdog: convert docs to ReST and rename to *.rst 2019-06-14 14:32:05 -06:00
wimax
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x86 It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
xilinx docs: xilinx: convert eemi.txt to eemi.rst 2019-06-14 14:32:10 -06:00
xtensa xtensa: document boot parameter passing 2019-02-03 18:06:19 -08:00
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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 Documentation: DMA-API: fix a function name of max_mapping_size 2019-06-07 11:10:33 -06:00
DMA-ISA-LPC.txt Documentation/DMA-ISA-LPC: fix an incorrect reference 2019-02-11 08:23:07 -07:00
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Kconfig docs: Kbuild/Makefile: allow check for missing docs at build time 2019-06-07 11:33:16 -06:00
Makefile docs: Kbuild/Makefile: allow check for missing docs at build time 2019-06-07 11:33:16 -06:00
SAK.txt
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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 Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 16:12:03 -07:00
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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 Disable Sphinx SmartyPants in HTML output 2019-06-30 15:30:34 -06:00
cpu-load.txt
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cputopology.txt topology: Create core_cpus and die_cpus sysfs attributes 2019-05-23 10:08:34 +02:00
crc32.txt
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debugging-modules.txt
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dell_rbu.txt
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docutils.conf doc-rst: Add missing newline at end of file 2019-06-20 14:16:56 -06:00
dontdiff A reasonably busy cycle for docs, including: 2019-05-08 12:42:50 -07:00
efi-stub.txt
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index.rst Documentation: Remove duplicate x86 index entry 2019-06-14 11:02:13 -06:00
intel_txt.txt
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io-mapping.txt
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io_ordering.txt
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iostats.txt block: document iostat changes for disk busy time accounting 2019-06-14 14:46:43 -06:00
irqflags-tracing.txt
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kernel-per-CPU-kthreads.txt docs: watchdog: convert docs to ReST and rename to *.rst 2019-06-14 14:32:05 -06:00
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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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 It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
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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preempt-locking.txt x86/fpu: Remove fpu__restore() 2019-04-09 19:27:42 +02:00
pwm.txt pwm: Add power management descriptions 2019-06-26 11:39:11 +02:00
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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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
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switchtec.txt NTB: switchtec_ntb: Update switchtec documentation with prerequisites for NTB 2018-10-11 11:28:53 -05:00
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tee.txt Documentation: tee: Grammar s/the its/its/ 2019-06-07 11:23:38 -06:00
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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
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video-output.txt docs: video-output.txt: convert it to ReST format 2019-04-11 12:37:03 -06:00
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