linux_dsm_epyc7002/include/uapi/linux
Andrei Vagin 769071ac9f ns: Introduce Time Namespace
Time Namespace isolates clock values.

The kernel provides access to several clocks CLOCK_REALTIME,
CLOCK_MONOTONIC, CLOCK_BOOTTIME, etc.

CLOCK_REALTIME
      System-wide clock that measures real (i.e., wall-clock) time.

CLOCK_MONOTONIC
      Clock that cannot be set and represents monotonic time since
      some unspecified starting point.

CLOCK_BOOTTIME
      Identical to CLOCK_MONOTONIC, except it also includes any time
      that the system is suspended.

For many users, the time namespace means the ability to changes date and
time in a container (CLOCK_REALTIME). Providing per namespace notions of
CLOCK_REALTIME would be complex with a massive overhead, but has a dubious
value.

But in the context of checkpoint/restore functionality, monotonic and
boottime clocks become interesting. Both clocks are monotonic with
unspecified starting points. These clocks are widely used to measure time
slices and set timers. After restoring or migrating processes, it has to be
guaranteed that they never go backward. In an ideal case, the behavior of
these clocks should be the same as for a case when a whole system is
suspended. All this means that it is required to set CLOCK_MONOTONIC and
CLOCK_BOOTTIME clocks, which can be achieved by adding per-namespace
offsets for clocks.

A time namespace is similar to a pid namespace in the way how it is
created: unshare(CLONE_NEWTIME) system call creates a new time namespace,
but doesn't set it to the current process. Then all children of the process
will be born in the new time namespace, or a process can use the setns()
system call to join a namespace.

This scheme allows setting clock offsets for a namespace, before any
processes appear in it.

All available clone flags have been used, so CLONE_NEWTIME uses the highest
bit of CSIGNAL. It means that it can be used only with the unshare() and
the clone3() system calls.

[ tglx: Adjusted paragraph about clone3() to reality and massaged the
  	changelog a bit. ]

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://criu.org/Time_namespace
Link: https://lists.openvz.org/pipermail/criu/2018-June/041504.html
Link: https://lore.kernel.org/r/20191112012724.250792-4-dima@arista.com
2020-01-14 12:20:48 +01:00
..
android
byteorder
caif
can can: don't use deprecated license identifiers 2019-11-05 12:44:34 +01:00
cifs
dvb
genwqe
hdlc
hsi
iio
isdn isdn/capi: check message length in capi_write() 2019-09-07 17:44:25 +02:00
mmc
netfilter netfilter: uapi: Avoid undefined left-shift in xt_sctp.h 2019-12-09 13:02:07 +01:00
netfilter_arp net, uapi: fix -Wpointer-arith warnings 2019-10-04 14:25:17 -07:00
netfilter_bridge net, uapi: fix -Wpointer-arith warnings 2019-10-04 14:25:17 -07:00
netfilter_ipv4 net, uapi: fix -Wpointer-arith warnings 2019-10-04 14:25:17 -07:00
netfilter_ipv6 net, uapi: fix -Wpointer-arith warnings 2019-10-04 14:25:17 -07:00
nfsd nfsd: add support for upcall version 2 2019-09-10 09:26:33 -04:00
raid md: add feature flag MD_FEATURE_RAID0_LAYOUT 2019-09-13 13:10:06 -07:00
sched
spi
sunrpc
tc_act net: sched: add erspan option support to act_tunnel_key 2019-11-21 11:44:06 -08:00
tc_ematch
usb usb: gadget: composite: Set recommended BESL values 2019-08-28 13:04:59 +03:00
wimax
a.out.h
acct.h
adb.h
adfs_fs.h
affs_hardblocks.h
agpgart.h
aio_abi.h
am437x-vpfe.h
apm_bios.h
arcfb.h
arm_sdei.h
aspeed-lpc-ctrl.h
aspeed-p2a-ctrl.h
atalk.h
atm_eni.h
atm_he.h
atm_idt77105.h
atm_nicstar.h
atm_tcp.h
atm_zatm.h
atm.h
atmapi.h
atmarp.h
atmbr2684.h
atmclip.h
atmdev.h
atmioc.h
atmlec.h
atmmpc.h
atmppp.h
atmsap.h
atmsvc.h
audit.h Revert "bpf: Emit audit messages upon successful prog load and unload" 2019-11-23 09:56:02 -08:00
auto_dev-ioctl.h
auto_fs4.h
auto_fs.h
auxvec.h
ax25.h
b1lli.h
batadv_packet.h
batman_adv.h
baycom.h
bcache.h
bcm933xx_hcs.h
bfs_fs.h
binfmts.h
blkpg.h
blktrace_api.h
blkzoned.h block: add zone open, close and finish ioctl support 2019-11-07 06:31:50 -07:00
bpf_common.h
bpf_perf_event.h
bpf.h bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY 2019-11-18 11:41:59 +01:00
bpfilter.h
bpqether.h
bsg.h
bt-bmc.h
btf.h bpf: fix BTF limits 2019-09-19 14:22:44 +02:00
btrfs_tree.h btrfs: add support for 4-copy replication (raid1c4) 2019-11-18 17:51:49 +01:00
btrfs.h btrfs: add incompat for raid1 with 3, 4 copies 2019-11-18 17:51:49 +01:00
can.h can: don't use deprecated license identifiers 2019-11-05 12:44:34 +01:00
capability.h
capi.h
cciss_defs.h
cciss_ioctl.h
cdrom.h
cec-funcs.h media: cec-funcs.h: use new CEC_OP_UI_CMD defines 2019-10-07 07:55:17 -03:00
cec.h media: cec: expose the new connector info API 2019-10-01 17:19:41 -03:00
cgroupstats.h
chio.h scsi: ch: add include guard to chio.h 2019-10-09 22:31:14 -04:00
cm4000_cs.h
cn_proc.h
coda.h
coff.h linux/coff.h: add include guard 2019-09-25 17:51:39 -07:00
connector.h
const.h
coresight-stm.h
cramfs_fs.h
cryptouser.h
cuda.h
cyclades.h y2038: uapi: change __kernel_time_t to __kernel_old_time_t 2019-11-15 14:38:29 +01:00
cycx_cfm.h
dcbnl.h net: Fix misspellings of "configure" and "configuration" 2019-10-28 13:41:01 -07:00
dccp.h
devlink.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-16 21:51:42 -08:00
dlm_device.h
dlm_netlink.h
dlm_plock.h
dlm.h
dlmconstants.h
dm-ioctl.h dm: introduce DM_GET_TARGET_VERSION 2019-09-16 10:18:01 -04:00
dm-log-userspace.h
dma-buf.h
dn.h
dns_resolver.h
dqblk_xfs.h
edd.h
efs_fs_sb.h
elf-em.h
elf-fdpic.h
elf.h
elfcore.h y2038: elfcore: Use __kernel_old_timeval for process times 2019-11-15 14:38:29 +01:00
errno.h
errqueue.h y2038: socket: remove timespec reference in timestamping 2019-11-15 14:38:29 +01:00
erspan.h
ethtool.h ethtool: Add support for 400Gbps (50Gbps per lane) link modes 2019-10-15 15:02:30 -07:00
eventpoll.h
fadvise.h
falloc.h
fanotify.h
fb.h
fcntl.h fcntl: fix typo in RWH_WRITE_LIFE_NOT_SET r/w hint name 2019-10-25 14:28:10 -06:00
fd.h
fdreg.h
fib_rules.h
fiemap.h
filter.h
firewire-cdev.h
firewire-constants.h
fou.h
fpga-dfl.h
fs.h f2fs-for-5.4-rc1 2019-09-21 14:26:33 -07:00
fscrypt.h fscrypt: add support for IV_INO_LBLK_64 policies 2019-11-06 12:34:36 -08:00
fsi.h
fsl_hypervisor.h
fsmap.h
fsverity.h fs-verity: add SHA-512 support 2019-08-12 19:33:50 -07:00
fuse.h fuse: Add changelog entries for protocols 7.1 - 7.8 2019-10-23 14:26:37 +02:00
futex.h
gameport.h
gen_stats.h net_sched: add TCA_STATS_PKT64 attribute 2019-11-05 18:20:55 -08:00
genetlink.h
gfs2_ondisk.h
gigaset_dev.h
gpio.h gpio: add new SET_CONFIG ioctl() to gpio chardev 2019-11-12 16:30:31 +01:00
gsmmux.h tty: n_gsm: add ioctl to map serial device to mux'ed tty 2019-09-04 12:43:54 +02:00
gtp.h
hash_info.h
hdlc.h
hdlcdrv.h
hdreg.h
hid.h
hiddev.h
hidraw.h
hpet.h
hsr_netlink.h
hw_breakpoint.h
hyperv.h
hysdn_if.h
i2c-dev.h
i2c.h
i2o-dev.h
i8k.h
icmp.h
icmpv6.h
if_addr.h
if_addrlabel.h
if_alg.h
if_arcnet.h
if_arp.h
if_bonding.h
if_bridge.h
if_cablemodem.h
if_eql.h
if_ether.h
if_fc.h
if_fddi.h
if_frad.h
if_hippi.h
if_infiniband.h
if_link.h net: rtnetlink: add linkprop commands to add and delete alternative ifnames 2019-10-01 14:47:19 -07:00
if_ltalk.h
if_macsec.h
if_packet.h
if_phonet.h
if_plip.h
if_ppp.h
if_pppol2tp.h
if_pppox.h
if_slip.h
if_team.h
if_tun.h
if_tunnel.h
if_vlan.h
if_x25.h
if_xdp.h xsk: add support to allow unaligned chunk placement 2019-08-31 01:08:26 +02:00
if.h net: rtnetlink: add linkprop commands to add and delete alternative ifnames 2019-10-01 14:47:19 -07:00
ife.h
igmp.h
ila.h
in6.h
in_route.h
in.h
inet_diag.h net: tls: export protocol version, cipher, tx_conf/rx_conf to socket diag 2019-08-31 23:44:28 -07:00
inotify.h
input-event-codes.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2019-12-07 18:33:01 -08:00
input.h
io_uring.h io_uring: ensure we return -EINVAL on unknown opcode 2019-12-11 16:02:32 -07:00
ioctl.h
iommu.h iommu: Introduce guest PASID bind function 2019-10-15 13:34:43 +02:00
ip6_tunnel.h
ip_vs.h
ip.h
ipc.h
ipmi_bmc.h
ipmi_msgdefs.h
ipmi.h
ipsec.h
ipv6_route.h
ipv6.h
ipx.h
irqnr.h
iso_fs.h
isst_if.h
ivtv.h
ivtvfb.h
jffs2.h jffs2: Remove C++ style comments from uapi header 2019-08-22 17:24:51 +02:00
joystick.h
kcm.h
kcmp.h
kcov.h kcov: fix struct layout for kcov_remote_arg 2020-01-04 13:55:09 -08:00
kd.h
kdev_t.h
kernel-page-flags.h
kernel.h
kernelcapi.h
kexec.h parisc: add kexec syscall support 2019-09-08 15:37:04 +02:00
keyboard.h
keyctl.h
kfd_ioctl.h Revert "drm/amdkfd: New IOCTL to allocate queue GWS" 2019-08-07 10:21:38 -05:00
kvm_para.h
kvm.h KVM: PPC: Book3S HV: Support reset of secure guest 2019-11-28 17:02:31 +11:00
l2tp.h
libc-compat.h
lightnvm.h
limits.h
lirc.h
llc.h
loop.h
lp.h
lwtunnel.h lwtunnel: add options setting and dumping for erspan 2019-11-06 21:14:22 -08:00
magic.h powerpc/pseries/cmm: Implement balloon compaction 2019-11-13 16:58:01 +11:00
major.h
map_to_7segment.h
matroxfb.h
max2175.h
mdio.h net: phy: add EEE-related constants 2019-08-19 13:04:45 -07:00
media-bus-format.h
media.h
mei.h
membarrier.h
memfd.h
mempolicy.h
meye.h
mic_common.h
mic_ioctl.h
mii.h
minix_fs.h
mman.h
mmtimer.h
module.h
mount.h
mpls_iptunnel.h
mpls.h
mqueue.h
mroute6.h
mroute.h
msdos_fs.h
msg.h y2038: uapi: change __kernel_time_t to __kernel_old_time_t 2019-11-15 14:38:29 +01:00
mtio.h
n_r3964.h
nbd-netlink.h
nbd.h
ncsi.h
ndctl.h
neighbour.h
net_dropmon.h drop_monitor: Make timestamps y2038 safe 2019-08-23 14:58:07 -07:00
net_namespace.h
net_tstamp.h
net.h
netconf.h
netdevice.h
netfilter_arp.h
netfilter_bridge.h
netfilter_decnet.h
netfilter_ipv4.h
netfilter_ipv6.h
netfilter.h
netlink_diag.h
netlink.h
netrom.h
nexthop.h
nfc.h
nfs2.h
nfs3.h
nfs4_mount.h
nfs4.h
nfs_fs.h
nfs_idmap.h
nfs_mount.h
nfs.h
nfsacl.h
nilfs2_api.h
nilfs2_ondisk.h
nl80211.h mac80211: Turn AQL into an NL80211_EXT_FEATURE 2019-12-13 10:34:04 +01:00
nsfs.h
nubus.h
nvme_ioctl.h nvme: change nvme_passthru_cmd64 to explicitly mark rsvd 2019-11-06 06:17:38 +09:00
nvram.h
omap3isp.h
omapfb.h
oom.h
openvswitch.h net: openvswitch: add hash info to upcall 2019-11-14 17:29:46 -08:00
packet_diag.h
param.h
parport.h
patchkey.h
pci_regs.h Merge branch 'pci/resource' 2019-11-28 08:54:36 -06:00
pci.h
pcitest.h
perf_event.h perf/aux: Allow using AUX data in perf samples 2019-11-13 11:06:14 +01:00
personality.h
pfkeyv2.h
pg.h block: pg: add header include guard 2019-10-02 20:32:27 -06:00
phantom.h
phonet.h
pkt_cls.h net: sched: allow flower to match erspan options 2019-11-21 11:44:06 -08:00
pkt_sched.h net: sched: pie: enable timestamp based delay calculation 2019-11-20 12:31:45 -08:00
pktcdvd.h
pmu.h
poll.h
posix_acl_xattr.h
posix_acl.h
posix_types.h
ppdev.h
ppp_defs.h y2038: syscall implementation cleanups 2019-12-01 14:00:59 -08:00
ppp-comp.h
ppp-ioctl.h compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t 2019-10-23 17:23:47 +02:00
pps.h
pr.h
prctl.h Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-09-16 18:47:53 -07:00
psample.h
psci.h
psp-sev.h crypto: ccp - Retry SEV INIT command in case of integrity check failure. 2019-10-26 02:09:58 +11:00
ptp_clock.h ptp: Introduce strict checking of external time stamp options. 2019-11-15 12:48:32 -08:00
ptrace.h
qemu_fw_cfg.h
qnx4_fs.h
qnxtypes.h
qrtr.h
quota.h
radeonfb.h
random.h
raw.h
rds.h net: rds: add service level support in rds-info 2019-08-24 16:55:25 -07:00
reboot.h
reiserfs_fs.h
reiserfs_xattr.h
resource.h y2038: rusage: use __kernel_old_timeval 2019-11-15 14:38:29 +01:00
rfkill.h
rio_cm_cdev.h
rio_mport_cdev.h
romfs_fs.h
rose.h
route.h
rpmsg.h
rseq.h
rtc.h
rtnetlink.h net: rtnetlink: add linkprop commands to add and delete alternative ifnames 2019-10-01 14:47:19 -07:00
rxrpc.h
scc.h linux/scc.h: make uapi linux/scc.h self-contained 2019-12-04 19:44:12 -08:00
sched.h ns: Introduce Time Namespace 2020-01-14 12:20:48 +01:00
scif_ioctl.h
screen_info.h
sctp.h sctp: add SCTP_PEER_ADDR_THLDS_V2 sockopt 2019-11-08 14:18:32 -08:00
sdla.h
seccomp.h seccomp: rework define for SECCOMP_USER_NOTIF_FLAG_CONTINUE 2019-10-28 12:29:46 -07:00
securebits.h
sed-opal.h block: sed-opal: Add support to read/write opal tables generically 2019-11-04 07:11:31 -07:00
seg6_genl.h
seg6_hmac.h
seg6_iptunnel.h
seg6_local.h
seg6.h
selinux_netlink.h
sem.h y2038: uapi: change __kernel_time_t to __kernel_old_time_t 2019-11-15 14:38:29 +01:00
serial_core.h serial: fsl_linflexuart: Be consistent with the name 2019-10-16 06:11:24 -07:00
serial_reg.h
serial.h
serio.h
shm.h y2038: uapi: change __kernel_time_t to __kernel_old_time_t 2019-11-15 14:38:29 +01:00
signal.h
signalfd.h
smc_diag.h
smc.h
smiapp.h
snmp.h net/tls: add TlsDeviceRxResync statistic 2019-10-05 16:29:00 -07:00
sock_diag.h
socket.h
sockios.h
sonet.h
sonypi.h
sound.h
soundcard.h
stat.h statx: define STATX_ATTR_VERITY 2019-11-13 12:15:34 -08:00
stddef.h
stm.h
string.h
suspend_ioctls.h
swab.h
switchtec_ioctl.h
sync_file.h
synclink.h
sysctl.h
sysinfo.h
target_core_user.h
taskstats.h
tcp_metrics.h
tcp.h tcp: add TCP_INFO status for failed client TFO 2019-10-25 19:25:37 -07:00
tee.h
termios.h
thermal.h
time_types.h y2038: uapi: change __kernel_time_t to __kernel_old_time_t 2019-11-15 14:38:29 +01:00
time.h y2038: uapi: change __kernel_time_t to __kernel_old_time_t 2019-11-15 14:38:29 +01:00
timerfd.h
times.h
timex.h
tiocl.h
tipc_config.h net, uapi: fix -Wpointer-arith warnings 2019-10-04 14:25:17 -07:00
tipc_netlink.h tipc: add support for AEAD key setting via netlink 2019-11-08 14:01:59 -08:00
tipc_sockets_diag.h
tipc.h tipc: add new AEAD key structure for user API 2019-11-08 14:01:59 -08:00
tls.h net: tls: export protocol version, cipher, tx_conf/rx_conf to socket diag 2019-08-31 23:44:28 -07:00
toshiba.h
tty_flags.h
tty.h
types.h
udf_fs_i.h
udmabuf.h
udp.h
uhid.h
uinput.h
uio.h
uleds.h
ultrasound.h
un.h
unistd.h
unix_diag.h
usbdevice_fs.h USB: usbfs: Add a capability flag for runtime suspend 2019-08-14 16:52:13 +02:00
usbip.h
userfaultfd.h
userio.h
utime.h y2038: uapi: change __kernel_time_t to __kernel_old_time_t 2019-11-15 14:38:29 +01:00
utsname.h
uuid.h
uvcvideo.h
v4l2-common.h
v4l2-controls.h media: add V4L2_CID_UNIT_CELL_SIZE control 2019-10-10 11:37:26 -03:00
v4l2-dv-timings.h
v4l2-mediabus.h
v4l2-subdev.h
vbox_err.h
vbox_vmmdev_types.h
vboxguest.h
veth.h
vfio_ccw.h
vfio.h Merge branches 'v5.4/vfio/alexey-tce-memory-free-v1', 'v5.4/vfio/connie-re-arrange-v2', 'v5.4/vfio/hexin-pci-reset-v3', 'v5.4/vfio/parav-mtty-uuid-v2' and 'v5.4/vfio/shameer-iova-list-v8' into v5.4/vfio/next 2019-08-23 11:26:24 -06:00
vhost_types.h
vhost.h
videodev2.h media: v4l2_core: Add p_area to struct v4l2_ext_control 2019-11-08 07:42:25 +01:00
virtio_9p.h
virtio_balloon.h
virtio_blk.h
virtio_config.h
virtio_console.h
virtio_crypto.h
virtio_fs.h virtio-fs: add virtiofs filesystem 2019-09-18 20:17:50 +02:00
virtio_gpu.h
virtio_ids.h virtio-fs: add virtiofs filesystem 2019-09-18 20:17:50 +02:00
virtio_input.h
virtio_iommu.h
virtio_mmio.h
virtio_net.h
virtio_pci.h
virtio_pmem.h
virtio_ring.h net, uapi: fix -Wpointer-arith warnings 2019-10-04 14:25:17 -07:00
virtio_rng.h
virtio_scsi.h
virtio_types.h
virtio_vsock.h
vm_sockets_diag.h
vm_sockets.h
vmcore.h
vsockmon.h
vt.h
vtpm_proxy.h
wait.h
watchdog.h
wimax.h
wireless.h
wmi.h
x25.h
xattr.h
xdp_diag.h
xfrm.h
xilinx-v4l2-controls.h
zorro_ids.h
zorro.h