search for: clock_realtim

...ne and if it can be solved. Many of my ( 30+ ) puppet installation freeze up after some time. The process is waiting for some private futex, but it stays like that forever. This is what strace looks like when the problem occures: [pid 29173] futex(0x3d35ce7a84, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 43406739, {1340611695, 739433265}, ffffffff) = -1 ETIMEDOUT (Connection timed out) [pid 29173] clock_gettime(CLOCK_REALTIME, {1340611695, 741431552}) = 0 [pid 29173] futex(0x3d35ce7ab0, FUTEX_WAKE_PRIVATE, 1) = 0 [pid 29173] futex(0x3d35ce7a84, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 43...

Matt attempted to add CLOCK_TAI support to the VDSO clock_gettime() implementation, which extended the clockid switch case and added yet another slightly different copy of the same code. Especially the extended switch case is problematic as the compiler tends to generate a jump table which then requires to use retpolines. If jump tables are disabled it adds yet another conditional to the existing

I''m continuing to investigate the usage of rdtsc in userspace and whether there are programs "out there" that use it "unsafely" that might randomly break under Xen if rdtsc is not emulated, e.g. across a migration. Some have argued that nobody should use rdtsc and any programs that use rdtsc directly are "fundamentally broken" so the default for rdtsc

Matt attempted to add CLOCK_TAI support to the VDSO clock_gettime() implementation, which extended the clockid switch case and added yet another slightly different copy of the same code. Especially the extended switch case is problematic as the compiler tends to generate a jump table which then requires to use retpolines. If jump tables are disabled it adds yet another conditional to the existing

Matt attempted to add CLOCK_TAI support to the VDSO clock_gettime() implementation, which extended the clockid switch case and added yet another slightly different copy of the same code. Especially the extended switch case is problematic as the compiler tends to generate a jump table which then requires to use retpolines. If jump tables are disabled it adds yet another conditional to the existing

...ens if someone changes wallclock using ''date''? That''s basically kind of what will appear to happen when s/r occurs. -- Keir On 26/11/08 14:32, "Tian, Kevin" <kevin.tian@intel.com> wrote: hrtimer supports two timer bases: CLOCK_MONOTONIC and CLOCK_REALTIME. wall_to_monotonic is only added in former case, and for latter instead TOD is used directly per my reading. I did a quick search, and it looks that futex and ntp are using CLOCK_REALTIME. Also there''s one vsyscall gate which can pass CLOCK_REALTIME from caller too. Thank...

Hi, I find PV domin hung, When we take those steps 1, save PV domain 2, change system time of PV domain back 3, restore a PV domain or 1, migrate a PV domain from Machine A to Machine B 2, the system time of Machine B is slower than Machine A. the problem is wc_sec will be change when system-time chanaged in dom0 or restore in a

...NIC]; base->sec = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; nsec = tk->tkr_mono.xtime_nsec; --- a/arch/x86/include/asm/vgtod.h +++ b/arch/x86/include/asm/vgtod.h @@ -19,9 +19,13 @@ struct vgtod_ts { }; #define VGTOD_BASES (CLOCK_MONOTONIC_COARSE + 1) -#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC)) +#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC) | BIT(CLOCK_TAI)) #define VGTOD_COARSE (BIT(CLOCK_REALTIME_COARSE) | BIT(CLOCK_MONOTONIC_COARSE)) +/* Abuse CLOCK_THREAD_CPUTIME_ID for VGTOD CLOCK TAI */ +#define VGTOD_HRES_MASK 0x3 +#define VGTOD_TAI (CL...

Hello, I have a question regarding signed NTP support for Samba4 on Ubuntu 12.04. I have followed most of the steps outlined here: https://wiki.samba.org/index.php/Configure_NTP These steps I did differently are: * I did not install from source because the latest Ubuntu package for ntp available on Ubuntu 12.04 includes ntp-signd support already * I did not install Samba4 to /usr/local/samba, so

...->wall_to_monotonic.tv_sec; > nsec = tk->tkr_mono.xtime_nsec; > --- a/arch/x86/include/asm/vgtod.h > +++ b/arch/x86/include/asm/vgtod.h > @@ -19,9 +19,13 @@ struct vgtod_ts { > }; > > #define VGTOD_BASES (CLOCK_MONOTONIC_COARSE + 1) > -#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC)) > +#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC) | BIT(CLOCK_TAI)) > #define VGTOD_COARSE (BIT(CLOCK_REALTIME_COARSE) | BIT(CLOCK_MONOTONIC_COARSE)) > > +/* Abuse CLOCK_THREAD_CPUTIME_ID for VGTOD CLOCK TAI */ > +#define VGTOD_HRES_MA...

...->wall_to_monotonic.tv_sec; > nsec = tk->tkr_mono.xtime_nsec; > --- a/arch/x86/include/asm/vgtod.h > +++ b/arch/x86/include/asm/vgtod.h > @@ -19,9 +19,13 @@ struct vgtod_ts { > }; > > #define VGTOD_BASES (CLOCK_MONOTONIC_COARSE + 1) > -#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC)) > +#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC) | BIT(CLOCK_TAI)) > #define VGTOD_COARSE (BIT(CLOCK_REALTIME_COARSE) | BIT(CLOCK_MONOTONIC_COARSE)) > > +/* Abuse CLOCK_THREAD_CPUTIME_ID for VGTOD CLOCK TAI */ > +#define VGTOD_HRES_MA...

...= VCLOCK_NONE) - return 0; + return do_hres(clock, ts); } else if (msk & VGTOD_COARSE) { do_coarse(clock, ts); return 0; @@ -268,8 +230,7 @@ notrace int __vdso_gettimeofday(struct t if (likely(tv != NULL)) { struct timespec *ts = (struct timespec *) tv; - if (unlikely(do_hres(CLOCK_REALTIME, ts) == VCLOCK_NONE)) - return vdso_fallback_gtod(tv, tz); + do_hres(CLOCK_REALTIME, ts); tv->tv_usec /= 1000; } if (unlikely(tz != NULL)) {

...ibc/gettimeofday.c @@ -0,0 +1,22 @@ +#include <time.h> +#include <sys/time.h> +#include <sys/syscall.h> + +extern int __gettimeofday(void *, struct timezone *); + +int gettimeofday(struct timeval *tv, struct timezone *tz) +{ + struct timespec ts; + + if (tv) { + if (clock_gettime(CLOCK_REALTIME, &ts)) + return -1; + tv->tv_sec = ts.tv_sec; + tv->tv_usec = ts.tv_nsec / 1000; + } + + if (tz && __gettimeofday(NULL, tz)) + return -1; + + return 0; +} diff --git a/usr/klibc/nanosleep.c b/usr/klibc/nanosleep.c new file mode 100644 index 00000000..11412196 --- /dev/null +...

...1 file changed, 14 insertions(+) diff --git a/Documentation/virtual/kvm/hypercalls.txt b/Documentation/virtual/kvm/hypercalls.txt index a890529c63ed..a9db68adb7c9 100644 --- a/Documentation/virtual/kvm/hypercalls.txt +++ b/Documentation/virtual/kvm/hypercalls.txt @@ -121,3 +121,17 @@ compute the CLOCK_REALTIME for its clock, at the same instant. Returns KVM_EOPNOTSUPP if the host does not use TSC clocksource, or if clock type is different than KVM_CLOCK_PAIRING_WALLCLOCK. + +7. KVM_HC_HMROE +---------------- +Architecture: x86 +Status: active +Purpose: Hypercall used to apply Read-Only Enforcement t...

...1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Documentation/virt/kvm/hypercalls.rst b/Documentation/virt/kvm/hypercalls.rst index ed4fddd364ea..70e77c66b64c 100644 --- a/Documentation/virt/kvm/hypercalls.rst +++ b/Documentation/virt/kvm/hypercalls.rst @@ -137,7 +137,7 @@ compute the CLOCK_REALTIME for its clock, at the same instant. Returns KVM_EOPNOTSUPP if the host does not use TSC clocksource, or if clock type is different than KVM_CLOCK_PAIRING_WALLCLOCK. -6. KVM_HC_SEND_IPI +7. KVM_HC_SEND_IPI ------------------ :Architecture: x86 @@ -158,7 +158,7 @@ corresponds to the APIC ID...

...rs/net/virtio_net.c @@ -434,9 +434,9 @@ static int virtnet_probe(struct virtio_device *vdev) netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); vi->dev = dev; vi->vdev = vdev; + memset(&vi->tx_timer, 0, sizeof(vi->tx_timer)); hrtimer_init(&vi->tx_timer, CLOCK_REALTIME, HRTIMER_MODE_REL); vi->tx_timer.function = kick_xmit; - vi->tx_timer.cb_mode = HRTIMER_CB_SOFTIRQ; vi->out_max = -1U; tasklet_init(&vi->xmit_free, xmit_free, (unsigned long)vi);

...rs/net/virtio_net.c @@ -434,9 +434,9 @@ static int virtnet_probe(struct virtio_device *vdev) netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); vi->dev = dev; vi->vdev = vdev; + memset(&vi->tx_timer, 0, sizeof(vi->tx_timer)); hrtimer_init(&vi->tx_timer, CLOCK_REALTIME, HRTIMER_MODE_REL); vi->tx_timer.function = kick_xmit; - vi->tx_timer.cb_mode = HRTIMER_CB_SOFTIRQ; vi->out_max = -1U; tasklet_init(&vi->xmit_free, xmit_free, (unsigned long)vi);

...me_set(0,500000), + HRTIMER_MODE_REL); return 0; } @@ -363,6 +398,10 @@ static int virtnet_probe(struct virtio_device *vdev) netif_napi_add(dev, &vi->napi, virtnet_poll, 16); vi->dev = dev; vi->vdev = vdev; + hrtimer_init(&vi->tx_timer, CLOCK_REALTIME, HRTIMER_MODE_REL); + vi->tx_timer.function = kick_xmit; + vi->tx_timer.cb_mode = HRTIMER_CB_SOFTIRQ; + vi->out_max = -1U; /* We expect two virtqueues, receive then send. */ vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); -- 1.5.3.3

...me_set(0,500000), + HRTIMER_MODE_REL); return 0; } @@ -363,6 +398,10 @@ static int virtnet_probe(struct virtio_device *vdev) netif_napi_add(dev, &vi->napi, virtnet_poll, 16); vi->dev = dev; vi->vdev = vdev; + hrtimer_init(&vi->tx_timer, CLOCK_REALTIME, HRTIMER_MODE_REL); + vi->tx_timer.function = kick_xmit; + vi->tx_timer.cb_mode = HRTIMER_CB_SOFTIRQ; + vi->out_max = -1U; /* We expect two virtqueues, receive then send. */ vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); -- 1.5.3.3

...mp((struct sk_buff *)skb); The above code will check if the packet already has a timestamp or not. If the timestamp is missing, then the packet is timestamped with the current time. All subsequent time matching calculations then assume that the packet's timestamp is relative to the UNIX epoch (CLOCK_REALTIME reference). This all works fine, as long as the timestamp explicitly has been set in xt_time. But the same assumption on clock reference might not hold, if the packet comes in pre-timestamped. And this is exactly what is happening in kernel 4.20.x and later. Here the packets come in with a timesta...