Francis Yan 1c885808e4 tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING ... This patch exports the sender chronograph stats via the socket SO_TIMESTAMPING channel. Currently we can instrument how long a particular application unit of data was queued in TCP by tracking SOF_TIMESTAMPING_TX_SOFTWARE and SOF_TIMESTAMPING_TX_SCHED. Having these sender chronograph stats exported simultaneously along with these timestamps allow further breaking down the various sender limitation. For example, a video server can tell if a particular chunk of video on a connection takes a long time to deliver because TCP was experiencing small receive window. It is not possible to tell before this patch without packet traces. To prepare these stats, the user needs to set SOF_TIMESTAMPING_OPT_STATS and SOF_TIMESTAMPING_OPT_TSONLY flags while requesting other SOF_TIMESTAMPING TX timestamps. When the timestamps are available in the error queue, the stats are returned in a separate control message of type SCM_TIMESTAMPING_OPT_STATS, in a list of TLVs (struct nlattr) of types: TCP_NLA_BUSY_TIME, TCP_NLA_RWND_LIMITED, TCP_NLA_SNDBUF_LIMITED. Unit is microsecond. Signed-off-by: Francis Yan <francisyyan@gmail.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-11-30 10:04:25 -05:00
..
80211	docs-rst: sphinxify 802.11 documentation	2016-10-11 16:19:17 -06:00
ABI	platform-drivers-x86 for 4.9-3	2016-11-11 16:48:49 -08:00
accounting
acpi
aoe
arm	linux-kselftest-4.9-rc1-update	2016-10-14 15:17:12 -07:00
arm64	arm64 updates for 4.9:	2016-10-03 08:58:35 -07:00
auxdisplay
backlight
blackfin	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
block
blockdev
bus-devices
cdrom
cgroup-v1
cma
connector
console
cpu-freq
cpuidle
cris
crypto
dev-tools	mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping	2016-10-11 15:06:33 -07:00
development-process
device-mapper	dm raid: fix activation of existing raid4/10 devices	2016-10-17 16:41:31 -04:00
devicetree	dt: bindings: add ethernet phy eee-broken-modes option documentation	2016-11-29 19:38:31 -05:00
dmaengine
DocBook	A single commit converting the mac80211 DocBook template over to Sphinx.	2016-10-14 14:11:22 -07:00
driver-api
driver-model	devres: add devm_alloc_percpu()	2016-11-15 22:34:25 -05:00
early-userspace
EDID
extcon
fault-injection
fb
features	Documentation: MIPS supports HAVE_REGS_AND_STACK_ACCESS_API	2016-10-13 17:19:19 +02:00
filesystems	fs: remove the never implemented aio_fsync file operation	2016-10-30 13:09:42 -04:00
firmware_class
fmc
fpga
frv
gpio	gpio/board.txt: point to gpiod_set_value	2016-10-20 14:14:11 +02:00
gpu	Merge tag 'drm-for-v4.9' of git://people.freedesktop.org/~airlied/linux	2016-10-11 18:12:22 -07:00
hid
hwmon
i2c	i2c: Documentation: i2c-topology: fix minor whitespace nit	2016-11-10 21:18:56 +01:00
ia64
ide
iio
infiniband
input	Input: ALPS - add V8 protocol documentation	2016-10-04 11:47:02 -07:00
ioctl
isdn
ja_JP
kbuild	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2016-10-14 14:26:58 -07:00
kdump
ko_KR
laptops
leds	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds	2016-10-04 10:25:53 -07:00
livepatch
locking
m68k
media	Linux 4.8	2016-10-05 16:43:53 -03:00
memory-devices
metag
mic
mips
misc-devices
mmc
mn10300
mtd
namespaces
netlabel
networking	tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING	2016-11-30 10:04:25 -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
perf
phy
platform
power	power supply and reset changes for the v4.9 series	2016-10-06 18:21:15 -07:00
powerpc	powerpc updates for 4.9	2016-10-07 20:19:31 -07:00
pps
prctl
pti
ptp
rapidio
RCU	kthread: kthread worker API cleanup	2016-10-11 15:06:33 -07:00
s390
scheduler
scsi
security
serial
sh
sound
sphinx
sphinx-static	This is the documentation update pull for the 4.9 merge window.	2016-10-04 13:54:07 -07:00
spi	Doc: update 00-INDEX files to reflect the runnable code move	2016-10-10 07:12:09 -06:00
sysctl
target
thermal
timers	Doc: update 00-INDEX files to reflect the runnable code move	2016-10-10 07:12:09 -06:00
tpm
trace	This release cycle is rather small. Just a few fixes to tracing.	2016-10-06 11:48:41 -07:00
usb
virtual	kvm: kvmclock: let KVM_GET_CLOCK return whether the master clock is in use	2016-11-19 19:04:16 +01:00
vm
w1
watchdog	linux-kselftest-4.9-rc1-update	2016-10-14 15:17:12 -07:00
wimax
x86	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-10-10 11:01:51 -07:00
xtensa
zh_CN
.gitignore
00-INDEX	Doc: update 00-INDEX files to reflect the runnable code move	2016-10-10 07:12:09 -06:00
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
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt
Changes
circular-buffers.txt
clk.txt
CodeOfConflict
CodingStyle
conf.py	media updates for v4.9-rc1	2016-10-11 13:22:22 -07:00
cpu-hotplug.txt
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt
DMA-attributes.txt	dma-mapping: introduce the DMA_ATTR_NO_WARN attribute	2016-10-11 15:06:32 -07:00
dma-buf-sharing.txt
DMA-ISA-LPC.txt
docutils.conf
dontdiff
dynamic-debug-howto.txt
edac.txt
efi-stub.txt
eisa.txt
email-clients.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
HOWTO
hw_random.txt
hwspinlock.txt
index.rst	docs-rst: sphinxify 802.11 documentation	2016-10-11 16:19:17 -06:00
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt
kernel-documentation.rst	This is the documentation update pull for the 4.9 merge window.	2016-10-04 13:54:07 -07:00
kernel-parameters.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2016-10-14 13:19:30 -07:00
kernel-per-CPU-kthreads.txt
kobject.txt
kprobes.txt
kref.txt
kselftest.txt
ldm.txt
local_ops.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lzo.txt
magic-number.txt
mailbox.txt
Makefile	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
Makefile.sphinx
ManagementStyle
md-cluster.txt
md.txt
memory-barriers.txt
memory-hotplug.txt
men-chameleon-bus.txt
module-signing.txt
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
pi-futex.txt
pinctrl.txt
pnp.txt
preempt-locking.txt
printk-formats.txt
pwm.txt
ramoops.txt
rbtree.txt
remoteproc.txt	remoteproc: Split driver and consumer dereferencing	2016-10-02 22:50:21 -07:00
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
SM501.txt
smsc_ece1099.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
static-keys.txt
SubmitChecklist
SubmittingDrivers
SubmittingPatches
svga.txt
sync_file.txt
sysfs-rules.txt
sysrq.txt
this_cpu_ops.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt
VGA-softcursor.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt
xillybus.txt
xz.txt
zorro.txt