Arnaldo Carvalho de Melo c5dfd78eb7 perf core: Allow setting up max frame stack depth via sysctl ... The default remains 127, which is good for most cases, and not even hit most of the time, but then for some cases, as reported by Brendan, 1024+ deep frames are appearing on the radar for things like groovy, ruby. And in some workloads putting a _lower_ cap on this may make sense. One that is per event still needs to be put in place tho. The new file is: # cat /proc/sys/kernel/perf_event_max_stack 127 Chaging it: # echo 256 > /proc/sys/kernel/perf_event_max_stack # cat /proc/sys/kernel/perf_event_max_stack 256 But as soon as there is some event using callchains we get: # echo 512 > /proc/sys/kernel/perf_event_max_stack -bash: echo: write error: Device or resource busy # Because we only allocate the callchain percpu data structures when there is a user, which allows for changing the max easily, its just a matter of having no callchain users at that point. Reported-and-Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com> Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: David Ahern <dsahern@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Milian Wolff <milian.wolff@kdab.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: Wang Nan <wangnan0@huawei.com> Cc: Zefan Li <lizefan@huawei.com> Link: http://lkml.kernel.org/r/20160426002928.GB16708@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2016-04-27 10:20:39 -03:00
..
ABI	i2c: mux: demux-pinctrl: Update docs to new sysfs-attributes	2016-04-07 21:13:02 +02:00
accounting	Documentation-getdelays: Apply a recommendation from "checkpatch.pl" in main()	2015-12-24 07:22:32 -07:00
acpi	mfd: core: redo ACPI matching of the children devices	2015-10-26 15:25:53 +01:00
aoe
arm	ARM: SoC 64-bit changes for v4.6	2016-03-20 15:08:45 -07:00
arm64	arm64: Add workaround for Cavium erratum 27456	2016-02-26 15:14:27 +00:00
auxdisplay
backlight
blackfin
block	A relatively boring cycle in the docs tree. There's a few kernel-doc	2016-01-17 11:55:07 -08:00
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 cache: make the 'mq' policy an alias for 'smq'	2016-03-10 17:12:08 -05:00
devicetree	ARM: SoC fixes	2016-04-13 08:57:18 -07:00
dmaengine	Merge branch 'topic/async' into for-linus	2016-01-06 15:17:47 +05:30
DocBook	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
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
EDID
extcon
fault-injection	net: Add support for CHANGEUPPER notifier error injection	2015-12-03 11:49:23 -05:00
fb	Documentation/fb: add documentation for sm712fb	2015-08-07 15:05:01 -07:00
features	arm64 updates for 4.6:	2016-03-17 20:03:47 -07:00
filesystems	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
firmware_class
fmc
fpga	usage documentation for FPGA manager core	2015-10-07 18:07:20 +01:00
frv
gpio	gpio: documenatation: fix GPIO_LOOKUP{,_IDX} documentation	2016-02-25 16:01:51 +01:00
hid
hwmon	hwmon: Create an NSA320 hardware monitoring driver	2016-03-08 18:40:49 -08:00
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: add userio module	2015-10-27 18:55:31 -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	Move freefall program from Documentation/ to tools/	2015-06-08 16:42:07 -06:00
leds	Documentation: leds: Add description of brightness setting API	2016-01-04 09:57:31 +01:00
locking	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-11-03 16:10:43 -08:00
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	switchdev: fix typo in comments/doc	2016-03-24 14:51:24 -04:00
nfc	NFC: Fix typo in nfc-hci.txt	2015-06-08 23:15:45 +02:00
nios2
nvdimm	libnvdimm: documentation clarifications	2015-11-12 09:55:23 -08:00
nvmem	Documentation: nvmem: add nvmem api level and how-to doc	2015-08-05 13:43:45 -07:00
parisc
PCI
pcmcia	pcmcia: Fix typo in locking documentation	2015-08-07 14:34:58 +02:00
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	Doc: pps: Fix file name in pps.txt	2015-07-14 12:35:42 -06:00
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
RCU	documentation: Update RCU requirements based on expedited changes	2015-12-05 12:34:32 -08:00
s390	s390/zcore: remove /sys/kernel/debug/zcore/mem	2015-11-27 09:24:12 +01:00
scheduler
scsi	st: Fix MTMKPART to work with newer drives	2016-02-23 21:27:02 -05:00
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	perf core: Allow setting up max frame stack depth via sysctl	2016-04-27 10:20:39 -03:00
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	x86, tracing, perf: Add trace point for MSR accesses	2015-12-06 12:56:10 +01:00
usb	doc: usb: Fix typo in gadget_multi documentation	2016-04-13 12:02:28 -07:00
vDSO	Documentation/vDSO: don't build tests when cross compiling	2015-06-22 16:04:57 -06:00
video4linux	[media] saa7134: Add support for Snazio TvPVR PRO	2016-03-03 09:03:48 -03:00
virtual	One of the largest releases for KVM... Hardly any generic improvement,	2016-03-16 09:55:35 -07:00
vm	mm: thp: set THP defrag by default to madvise and add a stall-free defrag option	2016-03-17 15:09:34 -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	x86/mm/pkeys: Add missing Documentation	2016-03-29 11:21:17 +02:00
xtensa
zh_CN	Documentation: Chinese translation of arm64/silicon-errata.txt	2016-02-17 14:08:07 -07:00
00-INDEX
adding-syscalls.txt	Documentation: describe how to add a system call	2015-08-13 17:54:06 -06:00
applying-patches.txt
assoc_array.txt
atomic_ops.txt	locking/atomics, cmpxchg: Privatize the inclusion of asm/cmpxchg.h	2015-09-13 10:35:46 +02:00
bad_memory.txt
basic_profiling.txt
bcache.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
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
Changes	There is a nice new document from Neil on how pathname lookups work and	2015-11-05 15:59:24 -08:00
circular-buffers.txt
clk.txt	clk: change clk_ops' ->determine_rate() prototype	2015-07-27 18:12:01 -07:00
coccinelle.txt
CodeOfConflict
CodingStyle	Documentation/CodingStyle: add space before parenthesis in example macro	2016-01-25 12:36:28 -07:00
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	Doc: Change wikipedia's URL from http to https	2015-06-22 10:14:05 -06:00
dell_rbu.txt
devices.txt
digsig.txt
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-attributes.txt	ARM: 8506/1: common: DMA-mapping: add DMA_ATTR_ALLOC_SINGLE_PAGES attribute	2016-02-11 15:33:38 +00:00
dma-buf-sharing.txt	dma-buf: Update docs for SYNC ioctl	2016-03-21 09:26:45 +01:00
DMA-ISA-LPC.txt
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
HOWTO	Documentation: Howto: Fixed subtitles style	2016-03-09 15:30:03 -07:00
hsi.txt
hw_random.txt	hwrng: doc - Fix device node name reference /dev/hw_random => /dev/hwrng	2015-09-21 22:00:41 +08:00
hwspinlock.txt
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt	iommu/vt-d: Fix link to Intel IOMMU Specification	2016-01-29 12:32:12 +01:00
io_ordering.txt
io-mapping.txt
iostats.txt
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
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	Documenation: Update location of docproc.c	2015-07-14 12:36:39 -06:00
kernel-docs.txt	Documentation: translations: update linux cross reference link	2016-01-11 18:26:58 -07:00
kernel-parameters.txt	USB: uas: Add a new NO_REPORT_LUNS quirk	2016-04-13 12:02:28 -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	Doc: Change wikipedia's URL from http to https	2015-06-22 10:14:05 -06:00
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	Documentation: minor typo fix in mailbox.txt	2015-08-13 18:03:18 -06:00
Makefile	spi: Move spi code from Documentation to tools	2015-11-23 14:54:01 +00:00
ManagementStyle
md-cluster.txt	md-cluster: update the documentation	2016-01-06 11:39:06 +11:00
md.txt	doc:md: fix typo in md.txt.	2015-06-23 06:49:44 -06:00
memory-barriers.txt	documentation: Clarify compiler store-fusion example	2016-03-14 15:52:19 -07:00
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	Documentation: Minor changes to men-chameleon-bus.txt	2015-07-24 15:15:17 +02:00
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	NTB: Rename Intel code names to platform names	2015-07-04 14:09:25 -04:00
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
phy.txt
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	documentation: fix small typo in rbtree.txt	2015-09-13 14:38:50 -06:00
remoteproc.txt	remoteproc: introduce rproc_get_by_phandle API	2015-06-16 21:12:52 +03:00
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
rtc.txt	rtc: implement a sysfs interface for clock offset	2016-03-14 17:08:16 +01:00
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
SM501.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	locking/static_keys: Fix up the static keys documentation	2015-09-15 07:12:06 +02:00
SubmitChecklist
SubmittingDrivers
SubmittingPatches	SubmittingPatches: fix spelling of "git send-email"	2016-01-25 12:30:18 -07:00
svga.txt
sysfs-rules.txt
sysrq.txt	mm, oom: do not panic for oom kills triggered from sysrq	2015-09-08 15:35:28 -07:00
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	vfio: powerpc/spapr: Support Dynamic DMA windows	2015-06-11 15:16:55 +10:00
VGA-softcursor.txt
vgaarbiter.txt
video-output.txt
vme_api.txt	Documentation: mention vme_master_mmap() in VME API	2015-06-12 17:26:56 -07:00
volatile-considered-harmful.txt
workqueue.txt
xillybus.txt
xz.txt
zorro.txt