Tejun Heo 1663f26df3 slub: make sysfs directories for memcg sub-caches optional ... SLUB creates a per-cache directory under /sys/kernel/slab which hosts a bunch of debug files. Usually, there aren't that many caches on a system and this doesn't really matter; however, if memcg is in use, each cache can have per-cgroup sub-caches. SLUB creates the same directories for these sub-caches under /sys/kernel/slab/$CACHE/cgroup. Unfortunately, because there can be a lot of cgroups, active or draining, the product of the numbers of caches, cgroups and files in each directory can reach a very high number - hundreds of thousands is commonplace. Millions and beyond aren't difficult to reach either. What's under /sys/kernel/slab is primarily for debugging and the information and control on the a root cache already cover its sub-caches. While having a separate directory for each sub-cache can be helpful for development, it doesn't make much sense to pay this amount of overhead by default. This patch introduces a boot parameter slub_memcg_sysfs which determines whether to create sysfs directories for per-memcg sub-caches. It also adds CONFIG_SLUB_MEMCG_SYSFS_ON which determines the boot parameter's default value and defaults to 0. [akpm@linux-foundation.org: kset_unregister(NULL) is legal] Link: http://lkml.kernel.org/r/20170204145203.GB26958@mtj.duckdns.org Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-02-22 16:41:27 -08:00
..
ABI	staging/iio driver patches for 4.11-rc1	2017-02-22 12:14:01 -08:00
accounting	tools: move accounting tool from Documentation	2016-09-23 13:07:15 -06:00
acpi	ACPI / button: Remove lid_init_state=method mode	2017-01-31 17:20:45 +01:00
admin-guide	slub: make sysfs directories for memcg sub-caches optional	2017-02-22 16:41:27 -08:00
aoe
arm	ARM: SoC platform updates for v4.10	2016-12-15 15:39:02 -08:00
arm64	arm64: Work around Falkor erratum 1003	2017-02-10 11:22:12 +00:00
auxdisplay	samples: move auxdisplay example code from Documentation	2016-09-23 11:52:32 -06:00
backlight
blackfin	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
block	block: fix up io_poll documentation	2017-01-03 16:47:13 -07:00
blockdev	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
bus-devices
cdrom	cdrom: Make device operations read-only	2017-02-14 08:29:56 -07:00
cgroup-v1	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
cma
connector
console
core-api	core-api: remove an unexpected unident	2016-12-01 10:46:01 -07:00
cpu-freq	cpufreq: intel_pstate: Operation mode control from sysfs	2017-02-04 00:05:31 +01:00
cpuidle
cris
crypto	This pull contains one set of changes: a conversion of the crypto DocBook	2016-12-17 16:00:34 -08:00
dev-tools	Documentation/sparse: drop __CHECK_ENDIAN__	2016-12-16 00:13:41 +02:00
device-mapper	dm cache metadata: add "metadata2" feature	2017-02-16 13:12:47 -05:00
devicetree	TTY/Serial driver patches for 4.11-rc1	2017-02-22 12:17:25 -08:00
dmaengine	dmaengine: Documentation: Fix typo in pxa_dma.txt	2016-11-14 08:14:24 +05:30
doc-guide	docs-rst: parse-headers.pl: cleanup the documentation	2016-11-30 17:08:09 -07:00
DocBook	char/misc driver patches for 4.11-rc1	2017-02-22 11:38:22 -08:00
driver-api	driver core patches for 4.11-rc1	2017-02-22 11:44:32 -08:00
driver-model	irqdesc: Add a resource managed version of irq_alloc_descs()	2017-02-10 14:39:20 +01:00
early-userspace
EDID
extcon	extcon: int3496: Add Intel INT3496 ACPI device extcon driver	2017-01-09 10:04:11 +09:00
fault-injection
fb
features	2nd round of ARC udpates for 4.10rc1	2016-12-23 10:22:47 -08:00
filesystems	rxrpc: Change module filename to rxrpc.ko	2017-02-17 15:09:19 -05:00
firmware_class	firmware: revamp firmware documentation	2017-01-11 09:42:59 +01:00
fmc
fpga	fpga: Add scatterlist based programming	2017-02-10 15:20:44 +01:00
frv	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
gpio	pinctrl / gpio: Introduce .set_config() callback for GPIO chips	2017-01-26 15:27:37 +01:00
gpu	Main pull request for drm for 4.10 kernel	2016-12-13 09:35:09 -08:00
hid	Documentation: HID: Intel ISH HID document	2016-08-17 11:13:07 +02:00
hwmon	hwmon: Update documentation to clarify rules for the 'name' attribute	2017-01-25 06:14:36 -08:00
i2c	Merge branch 'i2c/for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2016-12-15 12:56:35 -08:00
ia64	selftests: move ia64 tests from Documentation/ia64	2016-09-20 09:58:12 -06:00
ide
iio	iio: Documentation: Correct the path used to create triggers.	2016-10-01 00:49:58 -06:00
infiniband	IB/hfi1: Document new sysfs entries for hfi1 driver	2016-10-02 08:42:19 -04:00
input	Input: ALPS - add V8 protocol documentation	2016-10-04 11:47:02 -07:00
ioctl	doc: ioctl: Add some clarifications to botching-up-ioctls	2016-09-06 06:00:22 -06:00
isdn	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
kbuild	Kconfig: Introduce the "imply" keyword	2016-11-16 09:26:33 +01:00
kdump	Documentation: kdump: Add description of enable multi-cpus support	2016-09-20 18:02:54 -06:00
laptops	platform/x86: thinkpad_acpi: Add support for X1 Yoga (2016) Tablet Mode	2016-12-13 09:29:06 -08:00
leds	leds: class: Add new optional brightness_hw_changed attribute	2017-01-29 19:59:42 +01:00
livepatch	livepatch: doc: remove the limitation for schedule() patching	2017-01-11 02:33:39 +01:00
locking	locking/ww_mutex/Documentation: Update the design document	2017-01-14 11:14:55 +01:00
m68k	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
media	media updates for v4.11-rc1	2017-02-21 16:58:32 -08:00
memory-devices
metag
mic	samples: move mic/mpssd example code from Documentation	2016-09-20 12:38:48 -06:00
mips
misc-devices	samples: move misc-devices/mei example code from Documentation	2016-09-23 11:51:43 -06:00
mmc	mmc: core: Extend sysfs with DSR register	2016-07-25 10:34:51 +02:00
mn10300
mtd	spi-nor: Add support for Intel SPI serial flash controller	2017-01-03 17:33:36 +00:00
namespaces
netlabel
networking	GTP: Add some basic documentation about drivers/net/gtp.c	2017-02-20 10:24:20 -05:00
nfc
nios2
nvdimm
nvmem
parisc
PCI	PCI changes for the v4.9 merge window:	2016-10-07 11:46:37 -07:00
pcmcia	tools: move pcmcia crc32hash tool from Documentation	2016-09-23 13:07:27 -06:00
perf	perf: add qcom l2 cache perf events driver	2017-02-08 19:32:24 +00:00
phy
platform
power	Merge branch 'pm-sleep'	2017-02-20 14:26:13 +01:00
powerpc	powerpc updates for 4.9	2016-10-07 20:19:31 -07:00
pps
prctl	selftests: move prctl tests from Documentation/prctl	2016-09-20 09:09:09 -06:00
process	Doc: Correct typo, "Introdution" => "Introduction"	2016-12-01 10:44:08 -07:00
pti
ptp	selftests: move ptp tests from Documentation/ptp	2016-09-20 09:54:38 -06:00
rapidio	rapidio/documentation/mport_cdev: add missing parameter description	2016-09-01 17:52:02 -07:00
RCU	Merge branches 'doc.2017.01.15b', 'dyntick.2017.01.23a', 'fixes.2017.01.23a', 'srcu.2017.01.25a' and 'torture.2017.01.15b' into HEAD	2017-01-25 12:56:05 -08:00
s390
scheduler	sched/Documentation/sched-rt-group: Fix incorrect example	2017-01-22 10:34:17 +01:00
scsi	Merge branch 'misc' into for-linus	2016-12-22 12:32:33 -08:00
security	This renames the (now inaccurate) CONFIG_DEBUG_RODATA and related config	2017-02-21 17:56:45 -08:00
serial	Documentation: rs485: Do not define manually the ioctl	2016-08-18 11:08:33 -06:00
sh
sound	Merge remote-tracking branch 'sound/topic/restize-docs' into sound	2016-11-18 16:19:28 -07:00
sphinx	docs: sphinx-extensions: make rstFlatTable work with docutils 0.13	2016-12-18 13:30:29 -07:00
sphinx-static	This is the documentation update pull for the 4.9 merge window.	2016-10-04 13:54:07 -07:00
spi	spi: spi-ep93xx: simplify GPIO chip selects	2017-02-16 20:10:26 +00:00
sysctl	bpf: make jited programs visible in traces	2017-02-17 13:40:05 -05:00
target
thermal	thermal: Add support for hardware-tracked trip points	2016-09-27 14:02:16 +08:00
timers	time: Remove CONFIG_TIMER_STATS	2017-02-10 11:15:08 +01:00
trace	This release has a few updates:	2016-12-15 13:49:34 -08:00
translations	Documentation/sparse: drop __CHECK_ENDIAN__	2016-12-16 00:13:41 +02:00
usb	usb: gadget: uac2: add req_number as parameter	2017-01-24 11:04:21 +02:00
virtual	KVM: PPC: Book3S HV: Add userspace interfaces for POWER9 MMU	2017-01-31 19:11:47 +11:00
vm	mm: add documentation for page fragment APIs	2017-01-10 18:31:55 -08:00
w1
watchdog	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
wimax
x86	efi: Get and store the secure boot status	2017-02-07 10:42:10 +01:00
xtensa	xtensa: cleanup MMU setup and kernel layout macros	2016-07-24 06:33:58 +03:00
.gitignore
00-INDEX	edac: adjust docs location at MAINTAINERS and 00-INDEX	2016-12-15 08:57:16 -02:00
bcache.txt
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt
Changes	docs: add back 'Documentation/Changes' file (as symlink)	2016-12-14 16:30:12 -08:00
circular-buffers.txt	Documentation: circular-buffers: use READ_ONCE()	2016-11-16 16:17:45 -07:00
clk.txt	Documentation: clk: update file names containing referenced structures	2016-08-14 12:12:36 -06:00
CodingStyle	doc: re-add CodingStyle and SubmittingPatches	2016-10-24 08:12:35 -02:00
conf.py	docs-rst: doc-guide: split the kernel-documentation.rst contents	2016-11-19 10:22:04 -07:00
cpu-hotplug.txt	Documentation: cpu-hotplug: Fix typos	2016-10-25 17:07:52 -06:00
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
digsig.txt
DMA-API-HOWTO.txt	Documentation: DMA-API-HOWTO: Fix a typo	2016-09-20 17:58:46 -06:00
DMA-API.txt	dma-mapping: add dma_{map,unmap}_resource	2016-09-26 22:16:41 +05:30
DMA-attributes.txt	common: DMA-mapping: add DMA_ATTR_PRIVILEGED attribute	2017-01-19 15:56:19 +00:00
dma-buf-sharing.txt
DMA-ISA-LPC.txt
docutils.conf	doc-rst: add docutils config file	2016-08-14 11:52:40 -06:00
dontdiff	Remove last traces of ikconfig.h	2016-12-14 10:54:28 +01:00
efi-stub.txt
eisa.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
hw_random.txt
hwspinlock.txt
index.rst	crypto: doc - convert crypto API documentation to Sphinx	2016-12-13 16:37:54 -07:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt	ipmi: Update documentation	2016-11-07 12:16:06 -06:00
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
kernel-doc-nano-HOWTO.txt	docs-rst: doc-guide: split the kernel-documentation.rst contents	2016-11-19 10:22:04 -07:00
kernel-per-CPU-kthreads.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
kobject.txt
kprobes.txt	Documentation: kprobes: Document jprobes stack copying limitations	2016-08-15 10:19:11 -06:00
kref.txt
kselftest.txt	Doc: update kselftest.txt with details on how to run tests after install	2016-11-07 18:04:18 -07:00
ldm.txt
lockup-watchdogs.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
logo.gif
logo.txt
lzo.txt
mailbox.txt
Makefile	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
Makefile.sphinx	docs-rst: fix media cleandocs target	2016-11-30 17:08:03 -07:00
md-cluster.txt
memory-barriers.txt	doc: Update control-dependencies section of memory-barriers.txt	2017-01-14 21:29:15 -08:00
memory-hotplug.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
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
pinctrl.txt	pinctrl: core: Fix regression caused by delayed work for hogs	2017-01-13 16:25:17 +01:00
pnp.txt
preempt-locking.txt
printk-formats.txt
pwm.txt
rbtree.txt
remoteproc.txt	remoteproc: Split driver and consumer dereferencing	2016-10-02 22:50:21 -07:00
rfkill.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
sgi-ioc4.txt
siphash.txt	siphash: implement HalfSipHash1-3 for hash tables	2017-01-09 13:58:57 -05:00
SM501.txt
smsc_ece1099.txt
static-keys.txt	jump_labels: Allow array initialisers	2016-09-07 09:41:11 +01:00
SubmittingPatches	doc: re-add CodingStyle and SubmittingPatches	2016-10-24 08:12:35 -02:00
svga.txt
sync_file.txt	dma-buf: Rename struct fence to dma_fence	2016-10-25 14:40:39 +02:00
this_cpu_ops.txt
unaligned-memory-access.txt	Documentation/unaligned-memory-access.txt: fix incorrect comparison operator	2016-12-27 13:08:42 -07:00
unshare.txt
vfio-mediated-device.txt	vfio-mdev: Make mdev_parent private	2016-12-30 08:13:41 -07:00
vfio.txt
video-output.txt
xillybus.txt
xz.txt
zorro.txt