Hugh Dickins 52b6f46bc1 mm: /proc/sys/vm/stat_refresh to force vmstat update ... Provide /proc/sys/vm/stat_refresh to force an immediate update of per-cpu into global vmstats: useful to avoid a sleep(2) or whatever before checking counts when testing. Originally added to work around a bug which left counts stranded indefinitely on a cpu going idle (an inaccuracy magnified when small below-batch numbers represent "huge" amounts of memory), but I believe that bug is now fixed: nonetheless, this is still a useful knob. Its schedule_on_each_cpu() is probably too expensive just to fold into reading /proc/meminfo itself: give this mode 0600 to prevent abuse. Allow a write or a read to do the same: nothing to read, but "grep -h Shmem /proc/sys/vm/stat_refresh /proc/meminfo" is convenient. Oh, and since global_page_state() itself is careful to disguise any underflow as 0, hack in an "Invalid argument" and pr_warn() if a counter is negative after the refresh - this helped to fix a misaccounting of NR_ISOLATED_FILE in my migration code. But on recent kernels, I find that NR_ALLOC_BATCH and NR_PAGES_SCANNED often go negative some of the time. I have not yet worked out why, but have no evidence that it's actually harmful. Punt for the moment by just ignoring the anomaly on those. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Yang Shi <yang.shi@linaro.org> Cc: Ning Qu <quning@gmail.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-05-19 19:12:14 -07:00
..
ABI	Merge branch 'stable/for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/ibft	2016-05-18 15:30:04 -07:00
DocBook	Documentation: update debugobjects doc	2016-05-19 19:12:14 -07:00
EDID	…
PCI	…
RCU	Merge branches 'doc.2016.04.19a', 'exp.2016.03.31d', 'fixes.2016.03.31d' and 'torture.2016.04.21a' into HEAD	2016-04-21 13:48:20 -07:00
accounting	taskstats: fix nl parsing in accounting/getdelays.c	2016-04-27 12:50:14 -04:00
acpi	ACPI / tables: Convert initrd table override to table upgrade mechanism	2016-04-18 23:59:09 +02:00
aoe	…
arm	ARM: SoC 64-bit changes for v4.6	2016-03-20 15:08:45 -07:00
arm64	arm64: add the initrd region to the linear mapping explicitly	2016-04-14 16:20:45 +01:00
auxdisplay	…
backlight	…
blackfin	…
block	block: kill blk_queue_flush()	2016-04-12 16:00:39 -06:00
blockdev	cpqarray: remove it from the kernel	2016-03-14 09:06:01 -06:00
bus-devices	…
cdrom	…
cgroup-v1	Merge branch 'for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2016-03-18 20:25:49 -07:00
cma	…
connector	…
console	…
cpu-freq	Documentation: cpufreq: intel_pstate: fix typo	2016-02-18 20:31:53 +01:00
cpuidle	…
cris	…
crypto	crypto: doc - Use ahash	2016-02-06 15:33:11 +08:00
development-process	…
device-mapper	dm stats: fix spelling mistake in Documentation	2016-05-05 15:25:54 -04:00
devicetree	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2016-05-18 17:12:23 -07:00
dmaengine	Merge branch 'topic/async' into for-linus	2016-01-06 15:17:47 +05:30
driver-model	Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm	2016-03-19 16:31:54 -07:00
dvb	[media] media: change email address	2016-01-25 12:01:08 -02:00
early-userspace	…
extcon	…
fault-injection	net: Add support for CHANGEUPPER notifier error injection	2015-12-03 11:49:23 -05:00
fb	…
features	arm64 updates for 4.6:	2016-03-17 20:03:47 -07:00
filesystems	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
firmware_class	…
fmc	…
fpga	usage documentation for FPGA manager core	2015-10-07 18:07:20 +01:00
frv	…
gpio	gpio: clarify open drain/source docs	2016-04-27 10:23:44 +02:00
hid	…
hwmon	hwmon: (it87) Add support for IT8628E	2016-04-19 06:32:38 -07:00
i2c	Doc: i2c: Fix typo in Documentation/i2c	2016-02-10 13:12:14 -07:00
ia64	…
ide	…
iio	iio: Documentation: Add IIO configfs documentation	2015-12-03 18:19:28 +00:00
infiniband	staging/rdma/hfi1: Method to toggle "fast ECN" detection	2016-03-10 20:37:50 -05:00
input	Input: clarify we want BTN_TOOL_<name> on proximity	2016-04-06 10:23:09 -07:00
ioctl	gpio: uapi: use 0xB4 as ioctl() major	2016-03-10 16:02:52 +07:00
isdn	isdn: i4l: move active-isdn drivers to staging	2016-03-05 15:00:38 -08:00
ja_JP	Doc: ja_JP: Fix a typo in HOWTO	2016-02-10 13:14:37 -07:00
kbuild	kbuild: document recursive dependency limitation / resolution	2015-10-08 15:36:16 +02:00
kdump	…
ko_KR	Documentation/ko_KR: update maintainer information	2016-02-17 14:10:39 -07:00
laptops	…
leds	Documentation: leds: Add description of brightness setting API	2016-01-04 09:57:31 +01:00
livepatch	Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus	2016-05-17 12:06:35 +02:00
locking	locking/Documentation/lockdep: Fix spelling mistakes	2016-04-28 10:40:57 +02:00
m68k	…
memory-devices	…
metag	…
mic	Char/Misc patches for 4.6-rc1	2016-03-17 13:47:50 -07:00
mips	…
misc-devices	Merge char-misc-next into staging-next	2016-02-22 14:46:24 -08:00
mmc	mmc: core: Remove MMC_CLKGATE	2015-10-26 16:00:09 +01:00
mn10300	…
mtd	Documentation: mtd: improve nand_ecc.txt for readability and correctness	2015-11-17 17:05:14 -08:00
namespaces	…
netlabel	…
networking	bpf, doc: fix typo on bpf_asm descriptions	2016-05-16 22:19:15 -04:00
nfc	…
nios2	…
nvdimm	libnvdimm: documentation clarifications	2015-11-12 09:55:23 -08:00
nvmem	…
parisc	…
pcmcia	…
phy	…
platform	…
power	PM / runtime: Document steps for device removal	2016-04-05 03:46:59 +02:00
powerpc	cxl: Support to flash a new image on the adapter from a guest	2016-03-09 23:39:56 +11:00
pps	…
prctl	Documentation: Fix int/unsigned int comparison	2016-02-17 14:09:43 -07:00
pti	…
ptp	Another relatively boring cycle for the docs tree: typo fixes, translation	2016-03-17 12:09:35 -07:00
rapidio	rapidio: add mport char device driver	2016-03-22 15:36:02 -07:00
s390	s390/zcore: remove /sys/kernel/debug/zcore/mem	2015-11-27 09:24:12 +01:00
scheduler	…
scsi	ncr5380: Update usage documentation	2016-04-11 16:57:09 -04:00
security	keys, trusted: seal with a TPM2 authorization policy	2015-12-20 15:27:13 +02:00
serial	tty: Remove chars_in_buffer() line discipline method	2016-01-27 15:01:44 -08:00
sh	…
sound	Merge branch 'topic/hda-mst' into for-next	2016-02-10 09:25:15 +01:00
spi	spi: tools: move spidev_test metadata	2015-11-30 12:14:12 +00:00
sysctl	mm: /proc/sys/vm/stat_refresh to force vmstat update	2016-05-19 19:12:14 -07:00
target	target/user: Report capability of handling out-of-order completions to userspace	2016-03-10 21:49:09 -08:00
thermal	thermal: doc: Add details of devm_thermal_zone_of_sensor_{register,unregister}	2016-03-09 10:51:41 -08:00
timers	Another relatively boring cycle for the docs tree: typo fixes, translation	2016-03-17 12:09:35 -07:00
tpm	…
trace	This includes two new updates for the ftrace infrastructure.	2016-05-18 18:55:19 -07:00
usb	doc: usb: Fix typo in gadget_multi documentation	2016-04-13 12:02:28 -07:00
vDSO	…
video4linux	[media] samples: v4l: from Documentation to samples directory	2016-05-09 18:34:37 -03:00
virtual	One of the largest releases for KVM... Hardly any generic improvement,	2016-03-16 09:55:35 -07:00
vm	mm: rename _count, field of the struct page, to _refcount	2016-05-19 19:12:14 -07:00
w1	w1: masters: omap_hdq: add support for 1-wire mode	2015-10-05 04:47:09 +01:00
watchdog	Merge git://www.linux-watchdog.org/linux-watchdog	2016-03-19 19:35:51 -07:00
wimax	…
x86	Merge branch 'x86/urgent' into x86/asm, to fix semantic conflict	2016-04-22 10:13:53 +02:00
xtensa	…
zh_CN	Documentation: Chinese translation of arm64/silicon-errata.txt	2016-02-17 14:08:07 -07:00
00-INDEX	…
BUG-HUNTING	…
Changes	There is a nice new document from Neil on how pathname lookups work and	2015-11-05 15:59:24 -08:00
CodeOfConflict	…
CodingStyle	Documentation/CodingStyle: add space before parenthesis in example macro	2016-01-25 12:36:28 -07:00
DMA-API-HOWTO.txt	dma-mapping: always provide the dma_map_ops based implementation	2016-01-20 17:09:18 -08:00
DMA-API.txt	DMA-API: fix confusing sentence in Documentation/DMA-API.txt	2016-01-11 18:29:00 -07:00
DMA-ISA-LPC.txt	…
DMA-attributes.txt	ARM: 8506/1: common: DMA-mapping: add DMA_ATTR_ALLOC_SINGLE_PAGES attribute	2016-02-11 15:33:38 +00:00
HOWTO	Documentation: Howto: Fixed subtitles style	2016-03-09 15:30:03 -07:00
IPMI.txt	ipmi watchdog : add panic_wdt_timeout parameter	2015-11-16 06:28:43 -06:00
IRQ-affinity.txt	…
IRQ-domain.txt	irqdomain: Documentation updates	2015-10-13 19:01:25 +02:00
IRQ.txt	…
Intel-IOMMU.txt	iommu/vt-d: Fix link to Intel IOMMU Specification	2016-01-29 12:32:12 +01:00
Makefile	[media] samples: v4l: from Documentation to samples directory	2016-05-09 18:34:37 -03:00
ManagementStyle	…
SAK.txt	…
SM501.txt	…
SecurityBugs	…
SubmitChecklist	…
SubmittingDrivers	…
SubmittingPatches	SubmittingPatches: fix spelling of "git send-email"	2016-01-25 12:30:18 -07:00
VGA-softcursor.txt	…
adding-syscalls.txt	…
applying-patches.txt	…
assoc_array.txt	…
atomic_ops.txt	…
bad_memory.txt	…
basic_profiling.txt	…
bcache.txt	…
binfmt_misc.txt	…
braille-console.txt	…
bt8xxgpio.txt	…
btmrvl.txt	…
bus-virt-phys-mapping.txt	…
cachetlb.txt	…
cgroup-v2.txt	Merge branch 'for-4.6-ns' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2016-03-21 10:05:13 -07:00
circular-buffers.txt	…
clk.txt	…
coccinelle.txt	…
cpu-hotplug.txt	Documentation: cpu-hotplug: Fix sysfs mount instructions	2015-12-10 11:35:30 -07:00
cpu-load.txt	…
cputopology.txt	…
crc32.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	…
devices.txt	…
digsig.txt	…
dma-buf-sharing.txt	dma-buf: Update docs for SYNC ioctl	2016-03-21 09:26:45 +01:00
dontdiff	Documentation: dontdiff: remove media from dontdiff	2015-11-11 10:08:07 -07:00
dynamic-debug-howto.txt	…
edac.txt	EDAC: Remove references to bluesmoke.sourceforge.net	2015-11-26 14:46:06 +01:00
efi-stub.txt	doc: efi-stub.txt: Fix arm64 paths	2015-12-14 15:24:03 +00:00
eisa.txt	…
email-clients.txt	A few more documentation patches that wandered in and have no reason to	2015-11-13 09:19:05 -08:00
flexible-arrays.txt	…
futex-requeue-pi.txt	…
gcov.txt	…
gdb-kernel-debugging.txt	…
highuid.txt	…
hsi.txt	…
hw_random.txt	…
hwspinlock.txt	…
init.txt	…
initrd.txt	…
intel_txt.txt	…
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isapnp.txt	…
java.txt	…
kasan.txt	mm, kasan: SLAB support	2016-03-25 16:37:42 -07:00
kcov.txt	kernel: add kcov code coverage	2016-03-22 15:36:02 -07:00
kernel-doc-nano-HOWTO.txt	…
kernel-docs.txt	Documentation: translations: update linux cross reference link	2016-01-11 18:26:58 -07:00
kernel-parameters.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2016-05-18 12:17:16 -07:00
kernel-per-CPU-kthreads.txt	irq_poll: make blk-iopoll available outside the block layer	2015-12-11 11:52:24 -08:00
kmemcheck.txt	…
kmemleak.txt	…
kobject.txt	…
kprobes.txt	…
kref.txt	…
kselftest.txt	Documentation: kselftest: Remove duplicate word	2016-03-09 15:33:38 -07:00
ldm.txt	…
local_ops.txt	…
lockup-watchdogs.txt	kernel/watchdog.c: add sysctl knob hardlockup_panic	2015-11-05 19:34:48 -08:00
logo.gif	…
logo.txt	…
lzo.txt	…
magic-number.txt	…
mailbox.txt	…
md-cluster.txt	md-cluster: update the documentation	2016-01-06 11:39:06 +11:00
md.txt	…
memory-barriers.txt	locking/Documentation: Clarify that ACQUIRE applies to loads, RELEASE applies to stores	2016-04-28 10:57:51 +02:00
memory-hotplug.txt	memory-hotplug: add automatic onlining policy for the newly added memory	2016-03-15 16:55:16 -07:00
men-chameleon-bus.txt	…
module-signing.txt	modsign: Fix documentation on module signing enforcement parameter.	2016-03-12 01:48:11 -07:00
mono.txt	…
nommu-mmap.txt	…
ntb.txt	…
numastat.txt	…
oops-tracing.txt	…
padata.txt	…
parport-lowlevel.txt	…
parport.txt	…
percpu-rw-semaphore.txt	…
phy.txt	phy: core: Allow children node to be overridden	2016-04-29 16:39:39 +02:00
pi-futex.txt	…
pinctrl.txt	…
pnp.txt	…
preempt-locking.txt	…
printk-formats.txt	mm, printk: introduce new format string for flags	2016-03-15 16:55:16 -07:00
pwm.txt	…
ramoops.txt	…
rbtree.txt	…
remoteproc.txt	…
rfkill.txt	rfkill: Add documentation about LED triggers	2016-02-24 09:13:12 +01:00
robust-futex-ABI.txt	…
robust-futexes.txt	…
rpmsg.txt	rpmsg: use module_rpmsg_driver in existing drivers and examples	2016-05-06 11:09:01 -07:00
rtc.txt	rtc: implement a sysfs interface for clock offset	2016-03-14 17:08:16 +01:00
serial-console.txt	…
sgi-ioc4.txt	…
smsc_ece1099.txt	…
sparse.txt	…
stable_api_nonsense.txt	…
stable_kernel_rules.txt	stable_kernel_rules.txt: Remove extra space after Cc:	2015-11-20 16:54:57 -07:00
static-keys.txt	…
svga.txt	…
sysfs-rules.txt	…
sysrq.txt	…
this_cpu_ops.txt	…
ubsan.txt	UBSAN: run-time undefined behavior sanity checker	2016-01-20 17:09:18 -08:00
unaligned-memory-access.txt	…
unicode.txt	…
unshare.txt	…
vfio.txt	…
vgaarbiter.txt	…
video-output.txt	…
vme_api.txt	…
volatile-considered-harmful.txt	…
workqueue.txt	…
xillybus.txt	…
xz.txt	…
zorro.txt	…