linux/tools
Jesper Dangaard Brouer c8996c98f7 bpf: Add BPF-helper for accessing CLOCK_TAI
Commit 3dc6ffae2d ("timekeeping: Introduce fast accessor to clock tai")
introduced a fast and NMI-safe accessor for CLOCK_TAI. Especially in time
sensitive networks (TSN), where all nodes are synchronized by Precision Time
Protocol (PTP), it's helpful to have the possibility to generate timestamps
based on CLOCK_TAI instead of CLOCK_MONOTONIC. With a BPF helper for TAI in
place, it becomes very convenient to correlate activity across different
machines in the network.

Use cases for such a BPF helper include functionalities such as Tx launch
time (e.g. ETF and TAPRIO Qdiscs) and timestamping.

Note: CLOCK_TAI is nothing new per se, only the NMI-safe variant of it is.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
[Kurt: Wrote changelog and renamed helper]
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Link: https://lore.kernel.org/r/20220809060803.5773-2-kurt@linutronix.de
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2022-08-09 09:47:13 -07:00
..
accounting delayacct: track delays from write-protect copy 2022-06-01 15:55:25 -07:00
arch flexible-array transformations in UAPI for 6.0-rc1 2022-08-02 19:50:47 -07:00
bootconfig
bpf bpftool: Remove BPF_OBJ_NAME_LEN restriction when looking up bpf program by name 2022-08-04 14:41:13 -07:00
build perf build: Stop using __weak bpf_map_create() to handle older libbpf versions 2022-05-26 12:36:56 -03:00
certs tools/certs: Add print-cert-tbs-hash.sh 2022-05-23 18:47:49 +03:00
cgroup
counter
debugging
edid
firewire
firmware
gpio tools: gpio: Add new hardware clock type 2022-05-04 11:06:14 +02:00
hv
iio Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
include bpf: Add BPF-helper for accessing CLOCK_TAI 2022-08-09 09:47:13 -07:00
io_uring
kvm/kvm_stat tools/kvm_stat: fix display of error when multiple processes are found 2022-06-15 08:14:20 -04:00
laptop
leds
lib libbpf: Do not require executable permission for shared libraries 2022-08-08 15:07:40 -07:00
memory-model tools/memory-model/README: Update klitmus7 compat table 2022-05-03 10:12:48 -07:00
objtool This was a moderately busy cycle for documentation, but nothing all that 2022-08-02 19:24:24 -07:00
pci
pcmcia
perf Networking changes for 6.0. 2022-08-03 16:29:08 -07:00
power Merge branch 'turbostat' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2022-08-02 12:47:31 -07:00
rcu
scripts Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
spi spi: spidev_test: Warn when the mode is not the requested mode 2022-06-13 15:56:03 +01:00
testing selftests/bpf: Clean up sys_nanosleep uses 2022-08-08 15:42:00 +02:00
thermal thermal/tools/tmon: Fix typo 'the the' in comment 2022-07-28 17:29:52 +02:00
time
tracing rtla: Remove procps-ng dependency 2022-05-26 15:20:46 -04:00
usb testusb: Fix warning comparing pointer to 0 2022-04-26 13:32:49 +02:00
virtio tools/virtio: compile with -pthread 2022-03-28 16:52:59 -04:00
vm tools/vm/slabinfo: Handle files in debugfs 2022-07-04 17:10:15 +02:00
wmi
Makefile tools/nolibc: make the default target build the headers 2022-06-20 09:43:19 -07:00