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Sebastian Andrzej Siewior 48d07c04b4 rcu: Enable elimination of Tree-RCU softirq processing 
Some workloads need to change kthread priority for RCU core processing
without affecting other softirq work.  This commit therefore introduces
the rcutree.use_softirq kernel boot parameter, which moves the RCU core
work from softirq to a per-CPU SCHED_OTHER kthread named rcuc.  Use of
SCHED_OTHER approach avoids the scalability problems that appeared
with the earlier attempt to move RCU core processing to from softirq
to kthreads.  That said, kernels built with RCU_BOOST=y will run the
rcuc kthreads at the RCU-boosting priority.

Note that rcutree.use_softirq=0 must be specified to move RCU core
processing to the rcuc kthreads: rcutree.use_softirq=1 is the default.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[ paulmck: Adjust for invoke_rcu_callbacks() only ever being invoked
  from RCU core processing, in contrast to softirq->rcuc transition
  in old mainline RCU priority boosting. ]
[ paulmck: Avoid wakeups when scheduler might have invoked rcu_read_unlock()
  while holding rq or pi locks, also possibly fixing a pre-existing latent
  bug involving raise_softirq()-induced wakeups. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
2019-05-25 14:50:46 -07:00
..
ABI
Merge tag 'for-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply
2019-05-15 18:50:40 -07:00
accelerators
ocxl: Document new OCXL IOCTLs
2018-06-03 20:40:33 +10:00
accounting
psi: introduce psi monitor
2019-05-14 19:52:48 -07:00
acpi/dsd
Merge tag 'leds-for-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds
2019-05-07 18:02:51 -07:00
admin-guide
rcu: Enable elimination of Tree-RCU softirq processing
2019-05-25 14:50:46 -07:00
aoe
…
arm
ARM: 8833/1: Ensure that NEON code always compiles with Clang
2019-02-12 15:20:09 +00:00
arm64
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2019-05-17 10:33:30 -07:00
auxdisplay
Doc: misc-devices: move lcd-panel-cgram.txt to auxdisplay/
2018-04-12 16:08:02 +02:00
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
docs/btf: fix the missing section marks
2019-05-09 15:59:59 -07:00
bus-devices
…
cdrom
Drop all 00-INDEX files from Documentation/
2018-09-09 15:08:58 -06:00
cgroup-v1
Merge tag 'docs-5.1' of git://git.lwn.net/linux
2019-03-09 09:56:17 -08:00
cma
…
connector
…
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
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-05-19 11:11:20 -07:00
doc-guide
docs: doc-guide: remove the extension from .rst files
2019-04-19 12:46:27 -06:00
driver-api
Merge tag 'gpio-v5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
2019-05-11 10:54:43 -04:00
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
EDID
Docs/EDID: Calculate CRC while building the code
2018-11-06 07:36:22 -07:00
extcon
extcon: Remove porting compatibility of swich class
2017-04-06 10:55:24 +09:00
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_class
firmware: revamp firmware documentation
2017-01-11 09:42:59 +01:00
firmware-guide
Documentation: ACPI: Direct references are allowed to devices only
2019-05-13 10:40:21 +02:00
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
ia64: doc: tweak whitespace for 'console=' parameter
2018-03-05 14:41:38 -08:00
ide
Drop all 00-INDEX files from Documentation/
2018-09-09 15:08:58 -06:00
iio
iio: adc: New driver for Cirrus Logic EP93xx ADC
2017-07-25 19:56:23 +01:00
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
moduleparam: Save information about built-in modules in separate file
2019-05-07 21:50:24 +09:00
kdump
kdump: Document kernel data exported in the vmcoreinfo note
2019-01-15 11:05:28 +01:00
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
lightnvm: physical block device (pblk) target
2017-04-16 10:06:33 -06:00
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
docs: Fix more broken references
2018-06-15 18:11:26 -03:00
md
raid5-ppl: PPL support for disks with write-back cache enabled
2018-01-15 14:29:42 -08:00
media
Merge tag 'media/v5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
2019-05-16 11:57:16 -07:00
memory-devices
…
mic
…
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
…
netlabel
Drop all 00-INDEX files from Documentation/
2018-09-09 15:08:58 -06:00
networking
rxrpc: Allow the kernel to mark a call as being non-interruptible
2019-05-16 16:25:20 +01:00
nfc
…
nios2
…
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
Documentation: openrisc: Updates to README
2017-10-30 21:37:53 +09:00
parisc
Drop all 00-INDEX files from Documentation/
2018-09-09 15:08:58 -06:00
PCI
Merge tag 'pci-v4.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
2018-10-25 06:50:48 -07:00
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
…
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
drivers/pps: aesthetic tweaks to PPS-related content
2017-09-08 18:26:51 -07:00
process
Merge tag 'docs-5.2' of git://git.lwn.net/linux
2019-05-08 12:42:50 -07:00
pti
…
ptp
ptp: Fix documentation to match code.
2018-03-26 12:13:21 -04:00
rapidio
Documentation: rapidio: move sysfs interface to ABI
2018-02-23 08:25:45 -07:00
RCU
doc: Fix typos and otherwise modernize checklist.txt
2019-03-26 14:37:06 -07:00
riscv
perf: riscv: Add Document for Future Porting Guide
2018-06-04 14:02:11 -07:00
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
Documentation/sphinx: allow "functions" with no parameters
2018-06-30 07:52:42 -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
Merge tag 'trace-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2019-05-15 16:05:47 -07:00
translations
Merge tag 'docs-5.2a' of git://git.lwn.net/linux
2019-05-10 13:24:53 -04:00
usb
docs: usb: convert documents to ReST
2019-04-16 12:16:19 +02:00
userspace-api
Documentation: seccomp: unify list indentation
2019-03-18 12:00:28 -06:00
virtual
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2019-05-17 10:33:30 -07:00
vm
mm/hmm: add default fault flags to avoid the need to pre-fill pfns arrays
2019-05-14 09:47:48 -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
…
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
…
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
bt8xxgpio.txt: standardize document format
2017-07-14 13:51:27 -06:00
btmrvl.txt
btmrvl.txt: standardize document format
2017-07-14 13:51:27 -06:00
bus-virt-phys-mapping.txt
bus-virt-phys-mapping.txt: standardize document format
2017-07-14 13:51:28 -06:00
Changes
…
clearing-warn-once.txt
Merge tag 'docs-5.2' of git://git.lwn.net/linux
2019-05-08 12:42:50 -07:00
CodingStyle
…
conf.py
Merge tag 'docs-4.20' of git://git.lwn.net/linux
2018-10-24 18:01:11 +01:00
cpu-load.txt
cpu-load: standardize document format
2017-07-14 13:51:30 -06:00
cputopology.txt
topology: Simplify cputopology.txt formatting and wording
2019-04-19 10:56:04 +02:00
crc32.txt
crc32.txt: standardize document format
2017-07-14 13:51:30 -06:00
dcdbas.txt
dcdbas.txt: standardize document format
2017-07-14 13:51:31 -06:00
debugging-modules.txt
…
debugging-via-ohci1394.txt
debugging-via-ohci1394.txt: standardize document format
2017-07-14 13:51:34 -06:00
dell_rbu.txt
Documentation: remove stale firmware API reference
2018-05-14 16:44:41 +02:00
digsig.txt
digsig.txt: standardize document format
2017-07-14 13:51:31 -06:00
DMA-API-HOWTO.txt
Merge tag 'dma-mapping-5.2' of git://git.infradead.org/users/hch/dma-mapping
2019-05-09 08:40:55 -07:00
DMA-API.txt
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
2019-03-10 12:47:57 -07:00
DMA-attributes.txt
DMA-attributes.txt: standardize document format
2017-07-14 13:51:33 -06:00
DMA-ISA-LPC.txt
Documentation/DMA-ISA-LPC: fix an incorrect reference
2019-02-11 08:23:07 -07:00
docutils.conf
…
dontdiff
Merge tag 'docs-5.2' of git://git.lwn.net/linux
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
eisa.txt: standardize document format
2017-07-14 13:51:34 -06:00
futex-requeue-pi.txt
futex-requeue-pi.txt: standardize document format
2017-07-14 13:51:35 -06:00
gcc-plugins.txt
gcc-plugins.txt: standardize document format
2017-07-14 13:51:36 -06:00
highuid.txt
highuid.txt: standardize document format
2017-07-14 13:51:36 -06:00
hw_random.txt
hw_random.txt: standardize document format
2017-07-14 13:51:37 -06:00
hwspinlock.txt
hwspinlock.txt: standardize document format
2017-07-14 13:51:37 -06:00
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
intel_txt.txt: standardize document format
2017-07-14 13:51:38 -06:00
Intel-IOMMU.txt
Intel-IOMMU.txt: standardize document format
2017-07-14 13:51:38 -06:00
io_ordering.txt
io_ordering.txt: standardize document format
2017-07-14 13:51:39 -06:00
io-mapping.txt
io-mapping.txt: standardize document format
2017-07-14 13:51:38 -06:00
iostats.txt
block: Track DISCARD statistics and output them in stat and diskstat
2018-07-18 08:44:22 -06:00
IPMI.txt
ipmi: Make IPMI panic strings always available
2017-09-27 16:03:45 -05:00
IRQ-affinity.txt
IRQ-affinity.txt: standardize document format
2017-07-14 13:51:41 -06:00
IRQ-domain.txt
irqdomain: Kill CONFIG_IRQ_DOMAIN_DEBUG
2018-01-24 12:32:58 +01:00
IRQ.txt
IRQ.txt: add a markup for its title
2017-07-14 13:51:42 -06:00
irqflags-tracing.txt
irqflags-tracing.txt: standardize document format
2017-07-14 13:51:42 -06:00
isa.txt
isa.txt: standardize document format
2017-07-14 13:51:43 -06:00
isapnp.txt
isapnp.txt: promote title level
2017-07-14 13:51:43 -06:00
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
kref.txt: standardize document format
2017-07-14 13:51:45 -06:00
ldm.txt
ldm.txt: standardize document format
2017-07-14 13:51:45 -06:00
lockup-watchdogs.txt
lockup-watchdogs.txt: standardize document format
2017-07-14 13:51:46 -06:00
logo.gif
…
logo.txt
…
lsm.txt
docs-rst: convert lsm from DocBook to ReST
2017-05-16 08:44:19 -03:00
lzo.txt
lib/lzo: fix bugs for very short or empty input
2019-04-05 16:02:30 -10:00
mailbox.txt
mailbox.txt: standardize document format
2017-07-14 13:51:47 -06:00
Makefile
docs: Makefile: use latexmk if available
2019-04-01 14:33:42 -06:00
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
men-chameleon-bus.txt: standardize document format
2017-07-14 13:57:54 -06:00
nommu-mmap.txt
Documentation: nommu-map: Fix duplicate word typo
2018-06-26 09:01:27 -06:00
ntb.txt
docs: ntb.txt: add blank lines to clean up some Sphinx warnings
2019-04-11 12:37:03 -06:00
numastat.txt
numastat.txt: standardize document format
2017-07-14 13:57:56 -06:00
packing.txt
lib: Add support for generic packing operations
2019-05-03 10:49:17 -04:00
padata.txt
padata.txt: standardize document format
2017-07-14 13:57:56 -06:00
parport-lowlevel.txt
parport-lowlevel.txt: standardize document format
2017-07-14 13:57:57 -06:00
percpu-rw-semaphore.txt
percpu-rw-semaphore.txt: standardize document format
2017-07-14 13:57:58 -06:00
phy.txt
phy.txt: standardize document format
2017-07-14 13:57:58 -06:00
pi-futex.txt
Documentation: fix locking rt-mutex doc refs
2017-10-19 12:56:44 -06:00
pnp.txt
pnp.txt: standardize document format
2017-07-14 13:57:59 -06:00
preempt-locking.txt
x86/fpu: Remove fpu__restore()
2019-04-09 19:27:42 +02:00
pwm.txt
pwm: Standardize document format
2017-07-06 08:23:30 +02:00
rbtree.txt
rbtree: cache leftmost node internally
2017-09-08 18:26:48 -07:00
remoteproc.txt
remoteproc.txt: standardize document format
2017-07-14 13:58:02 -06:00
rfkill.txt
rfkill: Fix several typos in documentation
2018-06-15 13:36:08 +02:00
robust-futex-ABI.txt
robust-futex-ABI.txt: standardize document format
2017-07-14 13:58:03 -06:00
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
rpmsg.txt: standardize document format
2017-07-14 13:58:04 -06:00
rtc.txt
Documentation: rtc: Correct location of rtctest.c
2019-03-25 10:34:55 -06:00
SAK.txt
SAK.txt: standardize document format
2017-07-14 13:58:04 -06:00
sgi-ioc4.txt
sgi-ioc4.txt: standardize document format
2017-07-14 13:58:05 -06:00
siphash.txt
siphash.txt: standardize document format
2017-07-14 13:58:06 -06:00
SM501.txt
SM501.txt: standardize document format
2017-07-14 13:58:06 -06:00
smsc_ece1099.txt
smsc_ece1099.txt: standardize document format
2017-07-14 13:58:07 -06:00
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
SubmittingPatches
…
svga.txt
documentation/svga.txt: update outdated file
2017-11-20 10:45:50 -07:00
switchtec.txt
NTB: switchtec_ntb: Update switchtec documentation with prerequisites for NTB
2018-10-11 11:28:53 -05:00
sync_file.txt
sync_file.txt: standardize document format
2017-05-24 13:01:27 -03:00
tee.txt
tee.txt: standardize document format
2017-07-14 13:58:14 -06:00
this_cpu_ops.txt
this_cpu_ops.txt: standardize document format
2017-07-14 13:58:08 -06:00
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/mdev: Check globally for duplicate devices
2018-06-08 10:24:27 -06:00
vfio.txt
vfio: fix documentation
2018-05-08 09:16:41 -06:00
video-output.txt
docs: video-output.txt: convert it to ReST format
2019-04-11 12:37:03 -06:00
xillybus.txt
xillybus.txt: standardize document format
2017-07-14 13:58:11 -06:00
xz.txt
xz.txt: standardize document format
2017-07-14 13:58:11 -06:00
zorro.txt
zorro.txt: standardize document format
2017-07-14 13:58:12 -06:00