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Re: [uml-devel] [PATCH v6] um: Add a high resolution timer subsystem
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From: Richard W. <ric...@gm...> - 2015-05-10 12:36:04
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On Sun, May 10, 2015 at 1:14 AM, Thomas Meyer <th...@m3...> wrote:
> Hi,
>
> Changes:
> - also create posix timer in stub_clone_handler()
> - incorporated antons remarks
Hm, this patch does a *lot* more than the changelog says.
>
> diff --git a/arch/um/Makefile b/arch/um/Makefile
> index 17d4460..a4a434f 100644
> --- a/arch/um/Makefile
> +++ b/arch/um/Makefile
> @@ -130,7 +130,7 @@ export LDS_ELF_FORMAT := $(ELF_FORMAT)
> # The wrappers will select whether using "malloc" or the kernel allocator.
> LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
>
> -LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
> +LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt)) -lrt
>
> # Used by link-vmlinux.sh which has special support for um link
> export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
> diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
> index 4a2037f..0f2a5b1 100644
> --- a/arch/um/include/asm/irq.h
> +++ b/arch/um/include/asm/irq.h
> @@ -16,8 +16,9 @@
> #define TELNETD_IRQ 12
> #define XTERM_IRQ 13
> #define RANDOM_IRQ 14
> +#define HRTIMER_IRQ 15
>
> -#define LAST_IRQ RANDOM_IRQ
> +#define LAST_IRQ HRTIMER_IRQ
> #define NR_IRQS (LAST_IRQ + 1)
>
> #endif
> diff --git a/arch/um/include/shared/as-layout.h b/arch/um/include/shared/as-layout.h
> index ca1843e..798aa6e 100644
> --- a/arch/um/include/shared/as-layout.h
> +++ b/arch/um/include/shared/as-layout.h
> @@ -17,7 +17,7 @@
>
> /* Some constant macros are used in both assembler and
> * C code. Therefore we cannot annotate them always with
> - * 'UL' and other type specifiers unilaterally. We
> + * 'UL' and other type specifiers unilaterally. We
> * use the following macros to deal with this.
> */
>
> @@ -28,6 +28,13 @@
> #define _UML_AC(X, Y) __UML_AC(X, Y)
> #endif
>
> +/**
> + * userspace stub address space layout:
> + * Below macros define the layout of the stub code and data
> + * which are mapped in each userspace process:
> + * - one page of code located at 0x100000 followed by
> + * - one page of data
> + */
> #define STUB_START _UML_AC(, 0x100000)
> #define STUB_CODE _UML_AC((unsigned long), STUB_START)
> #define STUB_DATA _UML_AC((unsigned long), STUB_CODE + UM_KERN_PAGE_SIZE)
> diff --git a/arch/um/include/shared/kern_util.h b/arch/um/include/shared/kern_util.h
> index 83a91f9..0282b36 100644
> --- a/arch/um/include/shared/kern_util.h
> +++ b/arch/um/include/shared/kern_util.h
> @@ -37,6 +37,7 @@ extern void initial_thread_cb(void (*proc)(void *), void *arg);
> extern int is_syscall(unsigned long addr);
>
> extern void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
> +extern void hrtimer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
>
> extern int start_uml(void);
> extern void paging_init(void);
> diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
> index d824528..7f7368b 100644
> --- a/arch/um/include/shared/os.h
> +++ b/arch/um/include/shared/os.h
> @@ -217,7 +217,8 @@ extern int set_umid(char *name);
> extern char *get_umid(void);
>
> /* signal.c */
> -extern void timer_init(void);
> +extern void uml_timer_set_signal_handler(void);
> +extern void uml_hrtimer_set_signal_handler(void);
> extern void set_sigstack(void *sig_stack, int size);
> extern void remove_sigstack(void);
> extern void set_handler(int sig);
> @@ -238,12 +239,16 @@ extern void um_early_printk(const char *s, unsigned int n);
> extern void os_fix_helper_signals(void);
>
> /* time.c */
> -extern void idle_sleep(unsigned long long nsecs);
> -extern int set_interval(void);
> -extern int timer_one_shot(int ticks);
> -extern long long disable_timer(void);
> +extern void os_idle_sleep(unsigned long long nsecs);
> +extern int os_timer_create(void* timer);
> +extern int os_timer_set_interval(void* timer, void* its);
> +extern int os_timer_one_shot(int ticks);
> +extern long long os_timer_disable(void);
> +extern long os_timer_remain(void* timer);
> extern void uml_idle_timer(void);
> +extern long long os_persistent_clock_emulation(void);
> extern long long os_nsecs(void);
> +extern long long os_vnsecs(void);
>
> /* skas/mem.c */
> extern long run_syscall_stub(struct mm_id * mm_idp,
> diff --git a/arch/um/include/shared/skas/stub-data.h b/arch/um/include/shared/skas/stub-data.h
> index f6ed92c..f98b9e2 100644
> --- a/arch/um/include/shared/skas/stub-data.h
> +++ b/arch/um/include/shared/skas/stub-data.h
> @@ -6,12 +6,12 @@
> #ifndef __STUB_DATA_H
> #define __STUB_DATA_H
>
> -#include <sys/time.h>
> +#include <time.h>
>
> struct stub_data {
> - long offset;
> + unsigned long offset;
> int fd;
> - struct itimerval timer;
> + struct itimerspec timer;
> long err;
> };
>
> diff --git a/arch/um/include/shared/timer-internal.h b/arch/um/include/shared/timer-internal.h
> new file mode 100644
> index 0000000..afdc6dc
> --- /dev/null
> +++ b/arch/um/include/shared/timer-internal.h
> @@ -0,0 +1,18 @@
> +/*
> + * Copyright (C) 2012 - 2014 Cisco Systems
> + * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
> + * Licensed under the GPL
> + */
> +
> +#ifndef __TIMER_INTERNAL_H__
> +#define __TIMER_INTERNAL_H__
> +
> +#define TIMER_MULTIPLIER 256
> +#define TIMER_MIN_DELTA 500
> +
> +extern void timer_lock(void);
> +extern void timer_unlock(void);
> +
> +extern long long hrtimer_disable(void);
> +
> +#endif
> diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
> index 23cb935..4c1966a 100644
> --- a/arch/um/kernel/irq.c
> +++ b/arch/um/kernel/irq.c
> @@ -338,20 +338,20 @@ static struct irq_chip normal_irq_type = {
> .irq_unmask = dummy,
> };
>
> -static struct irq_chip SIGVTALRM_irq_type = {
> - .name = "SIGVTALRM",
> - .irq_disable = dummy,
> - .irq_enable = dummy,
> - .irq_ack = dummy,
> - .irq_mask = dummy,
> - .irq_unmask = dummy,
> +static struct irq_chip SIGUSR2_irq_type = {
> + .name = "SIGUSR2",
> + .irq_disable = dummy,
> + .irq_enable = dummy,
> + .irq_ack = dummy,
> + .irq_mask = dummy,
> + .irq_unmask = dummy,
> };
>
> void __init init_IRQ(void)
> {
> int i;
>
> - irq_set_chip_and_handler(TIMER_IRQ, &SIGVTALRM_irq_type, handle_edge_irq);
> + irq_set_chip_and_handler(HRTIMER_IRQ, &SIGUSR2_irq_type, handle_edge_irq);
>
> for (i = 1; i < NR_IRQS; i++)
> irq_set_chip_and_handler(i, &normal_irq_type, handle_edge_irq);
> diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
> index 9034fc8..5f6642d 100644
> --- a/arch/um/kernel/physmem.c
> +++ b/arch/um/kernel/physmem.c
> @@ -119,14 +119,23 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
> len - bootmap_size - reserve);
> }
>
> +/**
> + * phys_mapping() - maps a physical address to an offset address
> + * phys: the physical address
> + * offset_out: the offset in the memory map area
> + *
> + * Returns an file descriptor, or -1 when unknown physical address
> + */
> int phys_mapping(unsigned long phys, unsigned long long *offset_out)
> {
> int fd = -1;
>
> + /* first check normal memory */
> if (phys < physmem_size) {
> fd = physmem_fd;
> *offset_out = phys;
> }
> + /* than check io memory */
> else if (phys < __pa(end_iomem)) {
> struct iomem_region *region = iomem_regions;
>
> @@ -140,6 +149,7 @@ int phys_mapping(unsigned long phys, unsigned long long *offset_out)
> region = region->next;
> }
> }
> + /* last check highmem */
> else if (phys < __pa(end_iomem) + highmem) {
> fd = physmem_fd;
> *offset_out = phys - iomem_size;
> diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
> index 68b9119..b8a8d10 100644
> --- a/arch/um/kernel/process.c
> +++ b/arch/um/kernel/process.c
> @@ -27,6 +27,7 @@
> #include <kern_util.h>
> #include <os.h>
> #include <skas.h>
> +#include <timer-internal.h>
>
> /*
> * This is a per-cpu array. A processor only modifies its entry and it only
> @@ -201,12 +202,8 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
>
> void arch_cpu_idle(void)
> {
> - unsigned long long nsecs;
> -
> cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
> - nsecs = disable_timer();
> - idle_sleep(nsecs);
> - local_irq_enable();
> + os_idle_sleep(UM_NSEC_PER_SEC / UM_HZ);
> }
>
> int __cant_sleep(void) {
> diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c
> index 289771d..5f283b1 100644
> --- a/arch/um/kernel/skas/clone.c
> +++ b/arch/um/kernel/skas/clone.c
> @@ -20,37 +20,63 @@
> * on some systems.
> */
>
> +/**
> + * stub_clone_handler() - userspace clone handler stub
> + *
> + * this stub clone hanlder is mmaped(?)/available in all userspace
> + * processes. It's used to copy an mm context from an fork syscall in the
> + * traced userspace process
> + */
> void __attribute__ ((__section__ (".__syscall_stub")))
> stub_clone_handler(void)
> {
> struct stub_data *data = (struct stub_data *) STUB_DATA;
> + struct sigevent sev;
> + timer_t timerid;
> long err;
>
> + /* clone "from" process */
> err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
> STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
> - if (err != 0)
> + /* Parent: exit here, child, continue */
> + if (err != 0) {
> goto out;
> + }
>
> + /* set child to ptrace */
> err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
> if (err)
> goto out;
>
> - err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL,
> - (long) &data->timer, 0);
> + /* create a new posix interval timer */
> + sev.sigev_notify = SIGEV_SIGNAL;
> + sev.sigev_signo = SIGUSR2;
> + sev.sigev_value.sival_ptr = NULL;
> +
> + err = stub_syscall3(__NR_timer_create, CLOCK_MONOTONIC,
> + (long) &sev, (long) &timerid);
> if (err)
> goto out;
>
> + /* set interval to the given value from copy_context_skas0() */
> + err = stub_syscall4(__NR_timer_settime, (long) timerid, 0l,
> + (long) &data->timer, 0l);
> + if (err)
> + goto out;
> +
> + /* switch to new stack */
> remap_stack(data->fd, data->offset);
> goto done;
>
> out:
> /*
> - * save current result.
> - * Parent: pid;
> - * child: retcode of mmap already saved and it jumps around this
> - * assignment
> + * Save current result.
> + * - Parent: pid from clone() call
> + * - Child: "retcode of mmap already saved and it jumps around this
> + * assignment"???
> */
> data->err = err;
> +
> done:
> trap_myself();
> }
> diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
> index 94abdcc..df9c9ab 100644
> --- a/arch/um/kernel/skas/mmu.c
> +++ b/arch/um/kernel/skas/mmu.c
> @@ -47,6 +47,13 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
> return -ENOMEM;
> }
>
> +/**
> + * init_new_context() - creates or copies an mm context
> + * @task: the belonging task
> + * @mm: the mm struct to be setup/allocated
> + *
> + * called by mm_init() (kernel/fork.c)
> + */
> int init_new_context(struct task_struct *task, struct mm_struct *mm)
> {
> struct mm_context *from_mm = NULL;
> @@ -59,13 +66,15 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
> goto out;
>
> to_mm->id.stack = stack;
> - if (current->mm != NULL && current->mm != &init_mm)
> + if (current->mm != NULL && current->mm != &init_mm) {
> from_mm = ¤t->mm->context;
> + }
>
> - if (from_mm)
> - to_mm->id.u.pid = copy_context_skas0(stack,
> - from_mm->id.u.pid);
> - else to_mm->id.u.pid = start_userspace(stack);
> + if (from_mm) {
> + to_mm->id.u.pid = copy_context_skas0(stack, from_mm->id.u.pid);
> + } else {
> + to_mm->id.u.pid = start_userspace(stack);
> + }
>
> if (to_mm->id.u.pid < 0) {
> ret = to_mm->id.u.pid;
> diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
> index 527fa58..2b0c35a 100644
> --- a/arch/um/kernel/skas/process.c
> +++ b/arch/um/kernel/skas/process.c
> @@ -43,6 +43,9 @@ int __init start_uml(void)
> &init_task.thread.switch_buf);
> }
>
> +/**
> + * current_stub_stack() - returns the address of the current mm stack
> + */
> unsigned long current_stub_stack(void)
> {
> if (current->mm == NULL)
> diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
> index 117568d..ed64037 100644
> --- a/arch/um/kernel/time.c
> +++ b/arch/um/kernel/time.c
> @@ -1,4 +1,5 @@
> /*
> + * Copyright (C) 2012-2014 Cisco Systems
> * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
> * Licensed under the GPL
> */
> @@ -8,32 +9,36 @@
> #include <linux/interrupt.h>
> #include <linux/jiffies.h>
> #include <linux/threads.h>
> +#include <linux/spinlock.h>
> #include <asm/irq.h>
> #include <asm/param.h>
> #include <kern_util.h>
> #include <os.h>
> +#include <timer-internal.h>
>
> -void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
> +void hrtimer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
> {
> unsigned long flags;
>
> local_irq_save(flags);
> - do_IRQ(TIMER_IRQ, regs);
> + do_IRQ(HRTIMER_IRQ, regs);
> local_irq_restore(flags);
> }
>
> -static void itimer_set_mode(enum clock_event_mode mode,
> +static void timer_set_mode(enum clock_event_mode mode,
> struct clock_event_device *evt)
> {
> switch (mode) {
> case CLOCK_EVT_MODE_PERIODIC:
> - set_interval();
> + os_timer_set_interval(NULL, NULL);
> break;
>
> + case CLOCK_EVT_MODE_ONESHOT:
> + os_timer_one_shot(1);
> +
> case CLOCK_EVT_MODE_SHUTDOWN:
> case CLOCK_EVT_MODE_UNUSED:
> - case CLOCK_EVT_MODE_ONESHOT:
> - disable_timer();
> + os_timer_disable();
> break;
>
> case CLOCK_EVT_MODE_RESUME:
> @@ -41,68 +46,74 @@ static void itimer_set_mode(enum clock_event_mode mode,
> }
> }
>
> -static int itimer_next_event(unsigned long delta,
> +static int timer_next_event(unsigned long delta,
> struct clock_event_device *evt)
> {
> - return timer_one_shot(delta + 1);
> + return os_timer_one_shot(delta);
> }
>
> -static struct clock_event_device itimer_clockevent = {
> - .name = "itimer",
> +static struct clock_event_device timer_clockevent = {
> + .name = "timer",
> .rating = 250,
> .cpumask = cpu_all_mask,
> .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
> - .set_mode = itimer_set_mode,
> - .set_next_event = itimer_next_event,
> - .shift = 32,
> + .set_mode = timer_set_mode,
> + .set_next_event = timer_next_event,
> + .shift = 0,
> + .max_delta_ns = 0xffffffff,
> + .min_delta_ns = TIMER_MIN_DELTA, //microsecond resolution should be enough for anyone, same as 640K RAM
> .irq = 0,
> + .mult = 1,
> };
>
> -static irqreturn_t um_timer(int irq, void *dev)
> +static irqreturn_t um_timer_irq(int irq, void *dev)
> {
> - (*itimer_clockevent.event_handler)(&itimer_clockevent);
> + (*timer_clockevent.event_handler)(&timer_clockevent);
>
> return IRQ_HANDLED;
> }
>
> -static cycle_t itimer_read(struct clocksource *cs)
> +static cycle_t timer_read(struct clocksource *cs)
> {
> - return os_nsecs() / 1000;
> + return os_nsecs() / TIMER_MULTIPLIER;
> }
>
> -static struct clocksource itimer_clocksource = {
> - .name = "itimer",
> +static struct clocksource timer_clocksource = {
> + .name = "timer",
> .rating = 300,
> - .read = itimer_read,
> + .read = timer_read,
> .mask = CLOCKSOURCE_MASK(64),
> .flags = CLOCK_SOURCE_IS_CONTINUOUS,
> };
>
> -static void __init setup_itimer(void)
> +static void __init timer_setup(void)
> {
> int err;
>
> - err = request_irq(TIMER_IRQ, um_timer, 0, "timer", NULL);
> - if (err != 0)
> + err = request_irq(HRTIMER_IRQ, um_timer_irq, IRQF_TIMER, "hr timer", NULL);
> + if (err != 0) {
> printk(KERN_ERR "register_timer : request_irq failed - "
> "errno = %d\n", -err);
> + return;
> + }
> +
> + err = os_timer_create(NULL);
> + if (err != 0) {
> + printk(KERN_ERR "creation of timer failed - errno = %d\n", -err);
> + return;
> + }
>
> - itimer_clockevent.mult = div_sc(HZ, NSEC_PER_SEC, 32);
> - itimer_clockevent.max_delta_ns =
> - clockevent_delta2ns(60 * HZ, &itimer_clockevent);
> - itimer_clockevent.min_delta_ns =
> - clockevent_delta2ns(1, &itimer_clockevent);
> - err = clocksource_register_hz(&itimer_clocksource, USEC_PER_SEC);
> + err = clocksource_register_hz(&timer_clocksource, NSEC_PER_SEC/TIMER_MULTIPLIER);
> if (err) {
> printk(KERN_ERR "clocksource_register_hz returned %d\n", err);
> return;
> }
> - clockevents_register_device(&itimer_clockevent);
> + clockevents_register_device(&timer_clockevent);
> }
>
> void read_persistent_clock(struct timespec *ts)
> {
> - long long nsecs = os_nsecs();
> + long long nsecs = os_persistent_clock_emulation();
>
> set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
> nsecs % NSEC_PER_SEC);
> @@ -110,6 +121,6 @@ void read_persistent_clock(struct timespec *ts)
>
> void __init time_init(void)
> {
> - timer_init();
> - late_time_init = setup_itimer;
> + uml_hrtimer_set_signal_handler();
> + late_time_init = timer_setup;
> }
> diff --git a/arch/um/os-Linux/internal.h b/arch/um/os-Linux/internal.h
> deleted file mode 100644
> index 0dc2c9f..0000000
> --- a/arch/um/os-Linux/internal.h
> +++ /dev/null
> @@ -1 +0,0 @@
> -void alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc);
> diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
> index df9191a..bd5907e 100644
> --- a/arch/um/os-Linux/main.c
> +++ b/arch/um/os-Linux/main.c
> @@ -168,8 +168,8 @@ int __init main(int argc, char **argv, char **envp)
> * some time) and cause a segfault.
> */
>
> - /* stop timers and set SIGVTALRM to be ignored */
> - disable_timer();
> + /* stop timers and set timer signal to be ignored */
> + os_timer_disable();
>
> /* disable SIGIO for the fds and set SIGIO to be ignored */
> err = deactivate_all_fds();
> diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
> index 7b605e4..ee6db2e 100644
> --- a/arch/um/os-Linux/signal.c
> +++ b/arch/um/os-Linux/signal.c
> @@ -13,7 +13,6 @@
> #include <kern_util.h>
> #include <os.h>
> #include <sysdep/mcontext.h>
> -#include "internal.h"
>
> void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
> [SIGTRAP] = relay_signal,
> @@ -23,7 +22,8 @@ void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
> [SIGBUS] = bus_handler,
> [SIGSEGV] = segv_handler,
> [SIGIO] = sigio_handler,
> - [SIGVTALRM] = timer_handler };
> + [SIGUSR2] = hrtimer_handler
> +};
>
> static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
> {
> @@ -38,7 +38,7 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
> }
>
> /* enable signals if sig isn't IRQ signal */
> - if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
> + if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM) && (sig != SIGUSR2))
> unblock_signals();
>
> (*sig_info[sig])(sig, si, &r);
> @@ -55,8 +55,8 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
> #define SIGIO_BIT 0
> #define SIGIO_MASK (1 << SIGIO_BIT)
>
> -#define SIGVTALRM_BIT 1
> -#define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
> +#define SIGUSR2_BIT 2
> +#define SIGUSR2_MASK (1 << SIGUSR2_BIT)
>
> static int signals_enabled;
> static unsigned int signals_pending;
> @@ -78,46 +78,47 @@ void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
> set_signals(enabled);
> }
>
> -static void real_alarm_handler(mcontext_t *mc)
> +static void real_hralarm_handler(mcontext_t *mc)
> {
> struct uml_pt_regs regs;
>
> if (mc != NULL)
> get_regs_from_mc(®s, mc);
> regs.is_user = 0;
> - unblock_signals();
> - timer_handler(SIGVTALRM, NULL, ®s);
> + hrtimer_handler(SIGUSR2, NULL, ®s);
> }
>
> -void alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
> +void hralarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
> {
> int enabled;
>
> enabled = signals_enabled;
> if (!signals_enabled) {
> - signals_pending |= SIGVTALRM_MASK;
> + signals_pending |= SIGUSR2_MASK;
> return;
> }
>
> block_signals();
> -
> - real_alarm_handler(mc);
> + real_hralarm_handler(mc);
> set_signals(enabled);
> }
>
> -void timer_init(void)
> +void uml_hrtimer_set_signal_handler(void)
> {
> - set_handler(SIGVTALRM);
> + set_handler(SIGUSR2);
> }
>
> void set_sigstack(void *sig_stack, int size)
> {
> - stack_t stack = ((stack_t) { .ss_flags = 0,
> - .ss_sp = (__ptr_t) sig_stack,
> - .ss_size = size - sizeof(void *) });
> + stack_t stack = ((stack_t) {
> + .ss_flags = 0,
> + .ss_sp = (__ptr_t) sig_stack,
> + .ss_size = size - sizeof(void *)
> + });
>
> - if (sigaltstack(&stack, NULL) != 0)
> + if (sigaltstack(&stack, NULL) != 0) {
> panic("enabling signal stack failed, errno = %d\n", errno);
> + }
> }
>
> static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
> @@ -129,10 +130,9 @@ static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
>
> [SIGIO] = sig_handler,
> [SIGWINCH] = sig_handler,
> - [SIGVTALRM] = alarm_handler
> + [SIGUSR2] = hralarm_handler
> };
>
> -
> static void hard_handler(int sig, siginfo_t *si, void *p)
> {
> struct ucontext *uc = p;
> @@ -176,6 +176,13 @@ static void hard_handler(int sig, siginfo_t *si, void *p)
> } while (pending);
> }
>
> +/**
> + * set_handler() - enable signal in process' signal mask
> + * @sig: The signal to enable
> + *
> + * Enable the given signal in the process' signal mask and
> + * attach hard_handler() as handler routine
> + */
> void set_handler(int sig)
> {
> struct sigaction action;
> @@ -186,9 +193,9 @@ void set_handler(int sig)
>
> /* block irq ones */
> sigemptyset(&action.sa_mask);
> - sigaddset(&action.sa_mask, SIGVTALRM);
> sigaddset(&action.sa_mask, SIGIO);
> sigaddset(&action.sa_mask, SIGWINCH);
> + sigaddset(&action.sa_mask, SIGUSR2);
>
> if (sig == SIGSEGV)
> flags |= SA_NODEFER;
> @@ -281,8 +288,8 @@ void unblock_signals(void)
> if (save_pending & SIGIO_MASK)
> sig_handler_common(SIGIO, NULL, NULL);
>
> - if (save_pending & SIGVTALRM_MASK)
> - real_alarm_handler(NULL);
> + if (save_pending & SIGUSR2_MASK)
> + real_hralarm_handler(NULL);
> }
> }
>
> @@ -298,9 +305,11 @@ int set_signals(int enable)
> return enable;
>
> ret = signals_enabled;
> - if (enable)
> + if (enable) {
> unblock_signals();
> - else block_signals();
> + } else {
> + block_signals();
> + }
>
> return ret;
> }
> diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
> index 7a97775..30065e1 100644
> --- a/arch/um/os-Linux/skas/process.c
> +++ b/arch/um/os-Linux/skas/process.c
> @@ -45,7 +45,7 @@ static int ptrace_dump_regs(int pid)
> * Signals that are OK to receive in the stub - we'll just continue it.
> * SIGWINCH will happen when UML is inside a detached screen.
> */
> -#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH))
> +#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH) | (1 << SIGUSR2))
>
> /* Signals that the stub will finish with - anything else is an error */
> #define STUB_DONE_MASK (1 << SIGTRAP)
> @@ -176,17 +176,59 @@ static void handle_trap(int pid, struct uml_pt_regs *regs,
>
> extern int __syscall_stub_start;
>
> +/**
> + * userspace_tramp() - userspace trampoline
> + * @stack: The address of the stub stack used for the new process
> + * (used for SIGSEGV handling).
> + *
> + * The trampoline does execute as a new process after clone()
> + * For each new userspace process the below code sets up
> + * all necessary data:
> + * 1.) enable ptrace from parent (the uml kernel)
> + * 2.) Setup signal handling. Signals are inherited by the parent, i.e
> + * the uml kernel
> + * 3.) Create and start an posix (interval) timer for this process.
> + * This timer will emulate the kernel timer ticks.
> + * The timer signal will be processed by the kernel process in userspace()
> + * 4.) Map stub code page in the new process, i.e. the
> + * userspace process:
> + * The stub codes is used to catch syscalls from the userspace to
> + * the kernel.
> + * See linker scripts arch/um/kernel/dyn.lds.S (dynamic) resp.
> + * arch/um/kernel/uml.lds.S (static)
> + * for __syscall_stub_start defintion and
> + * arch/um/kernel/skas/clone.c for the stub_handler itself.
> + * 5.) Map stub data page in the new process, i.e. the
> + * userspace process:
> + * Setup an SIGSEGV handler into the new process.
> + * Page faults will be catched and signaled to the kernel via this
> + * mechanism.
> + * See arch/x86/um/stub_segv.c for the handler itself.
> + * 6.) Stop the new process and wait for the kernel to SIGCONT it agian
> + * when it will get scheduled()
> + */
> static int userspace_tramp(void *stack)
> {
> void *addr;
> int err, fd;
> unsigned long long offset;
> + timer_t timer;
> +
> + struct stub_data *data = (struct stub_data *) stack;
>
> ptrace(PTRACE_TRACEME, 0, 0, 0);
>
> signal(SIGTERM, SIG_DFL);
> signal(SIGWINCH, SIG_IGN);
> - err = set_interval();
> +
> + err = os_timer_create(&timer);
> + if (err) {
> + printk(UM_KERN_ERR "userspace_tramp - creation of timer failed, "
> + "errno = %d\n", err);
> + exit(1);
> + }
> +
> + err = os_timer_set_interval(&timer, &data->timer);
> if (err) {
> printk(UM_KERN_ERR "userspace_tramp - setting timer failed, "
> "errno = %d\n", err);
> @@ -246,11 +288,18 @@ static int userspace_tramp(void *stack)
> #define NR_CPUS 1
> int userspace_pid[NR_CPUS];
>
> +/**
> + * start_userspace() - start a new userspace process with a new mm context
> + * @stub_stack: Address of the new process' stack
> + *
> + * called by init_new_context()
> + */
> int start_userspace(unsigned long stub_stack)
> {
> void *stack;
> unsigned long sp;
> int pid, status, n, flags, err;
> + struct stub_data *data = (struct stub_data *) stub_stack;
>
> stack = mmap(NULL, UM_KERN_PAGE_SIZE,
> PROT_READ | PROT_WRITE | PROT_EXEC,
> @@ -266,6 +315,14 @@ int start_userspace(unsigned long stub_stack)
>
> flags = CLONE_FILES | SIGCHLD;
>
> + *data = ((struct stub_data) {
> + .timer = ((struct itimerspec)
> + { .it_value.tv_sec = 0,
> + .it_value.tv_nsec = os_timer_remain(NULL),
> + .it_interval.tv_sec = 0,
> + .it_interval.tv_nsec = UM_NSEC_PER_SEC / UM_HZ })
> + });
> +
> pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
> if (pid < 0) {
> err = -errno;
> @@ -313,10 +370,15 @@ int start_userspace(unsigned long stub_stack)
> return err;
> }
>
> +/**
> + * userspace() - user space control loop
> + * @regs: the register's save memory
> + *
> + * The main loop that traces and controls each spwaned userspace
> + * process
> + */
> void userspace(struct uml_pt_regs *regs)
> {
> - struct itimerval timer;
> - unsigned long long nsecs, now;
> int err, status, op, pid = userspace_pid[0];
> /* To prevent races if using_sysemu changes under us.*/
> int local_using_sysemu;
> @@ -325,13 +387,8 @@ void userspace(struct uml_pt_regs *regs)
> /* Handle any immediate reschedules or signals */
> interrupt_end();
>
> - if (getitimer(ITIMER_VIRTUAL, &timer))
> - printk(UM_KERN_ERR "Failed to get itimer, errno = %d\n", errno);
> - nsecs = timer.it_value.tv_sec * UM_NSEC_PER_SEC +
> - timer.it_value.tv_usec * UM_NSEC_PER_USEC;
> - nsecs += os_nsecs();
> -
> while (1) {
> +
> /*
> * This can legitimately fail if the process loads a
> * bogus value into a segment register. It will
> @@ -388,32 +445,19 @@ void userspace(struct uml_pt_regs *regs)
> switch (sig) {
> case SIGSEGV:
> if (PTRACE_FULL_FAULTINFO) {
> - get_skas_faultinfo(pid,
> - ®s->faultinfo);
> - (*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
> - regs);
> + get_skas_faultinfo(pid,®s->faultinfo);
> + (*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si, regs);
> + } else {
> + handle_segv(pid, regs);
> }
> - else handle_segv(pid, regs);
> break;
> case SIGTRAP + 0x80:
> - handle_trap(pid, regs, local_using_sysemu);
> + handle_trap(pid, regs, local_using_sysemu);
> break;
> case SIGTRAP:
> relay_signal(SIGTRAP, (struct siginfo *)&si, regs);
> break;
> - case SIGVTALRM:
> - now = os_nsecs();
> - if (now < nsecs)
> - break;
> - block_signals();
> - (*sig_info[sig])(sig, (struct siginfo *)&si, regs);
> - unblock_signals();
> - nsecs = timer.it_value.tv_sec *
> - UM_NSEC_PER_SEC +
> - timer.it_value.tv_usec *
> - UM_NSEC_PER_USEC;
> - nsecs += os_nsecs();
> - break;
> + case SIGUSR2:
> case SIGIO:
> case SIGILL:
> case SIGBUS:
> @@ -448,8 +492,7 @@ static int __init init_thread_regs(void)
> thread_regs[REGS_IP_INDEX] = STUB_CODE +
> (unsigned long) stub_clone_handler -
> (unsigned long) &__syscall_stub_start;
> - thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE -
> - sizeof(void *);
> + thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE - sizeof(void *);
> #ifdef __SIGNAL_FRAMESIZE
> thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
> #endif
> @@ -458,26 +501,51 @@ static int __init init_thread_regs(void)
>
> __initcall(init_thread_regs);
>
> +/**
> + * copy_context_skas0() - copy an mm context
> + * new_stack: void pointer of new stack, a zeroed page
> + * pid: the pid of the mm parent, this proces is cloned
> + * into a new one
> + *
> + * Copy an mm context from an existing task
> + * 1.) get file descriptor and offset of the mmaped new_stack
> + * 2.) set current stub stack's data: file descriptor, offset and timer data
> + * 3.) Restore parents registers to init_thread_regs()
> + * 4.) Continue parent (==from_mm) in stub_clone_handler(), see also
> + * init_thread_regs(). This will clone a new process with same
> + * mm.
> + * 5.)
> + *
> + * Returns the PID of the new process
> + */
> int copy_context_skas0(unsigned long new_stack, int pid)
> {
> - struct timeval tv = { .tv_sec = 0, .tv_usec = UM_USEC_PER_SEC / UM_HZ };
> int err;
> unsigned long current_stack = current_stub_stack();
> struct stub_data *data = (struct stub_data *) current_stack;
> struct stub_data *child_data = (struct stub_data *) new_stack;
> unsigned long long new_offset;
> +
> int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
>
> /*
> * prepare offset and fd of child's stack as argument for parent's
> * and child's mmap2 calls
> */
> - *data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset),
> - .fd = new_fd,
> - .timer = ((struct itimerval)
> - { .it_value = tv,
> - .it_interval = tv }) });
> -
> + *data = ((struct stub_data) {
> + .offset = MMAP_OFFSET(new_offset),
> + .fd = new_fd,
> + .timer = ((struct itimerspec)
> + { .it_value.tv_sec = 0,
> + .it_value.tv_nsec = os_timer_remain(NULL),
> + .it_interval.tv_sec = 0,
> + .it_interval.tv_nsec = UM_NSEC_PER_SEC / UM_HZ })
> + });
> +
> + /* set parents regs
> + * this set the registers to the saved registers done in the initcall
> + * init_thread_regs()
> + */
> err = ptrace_setregs(pid, thread_regs);
> if (err < 0) {
> err = -errno;
> @@ -486,6 +554,7 @@ int copy_context_skas0(unsigned long new_stack, int pid)
> return err;
> }
>
> + /* set parents fp registers */
> err = put_fp_registers(pid, thread_fp_regs);
> if (err < 0) {
> printk(UM_KERN_ERR "copy_context_skas0 : put_fp_registers "
> @@ -493,7 +562,9 @@ int copy_context_skas0(unsigned long new_stack, int pid)
> return err;
> }
>
> - /* set a well known return code for detection of child write failure */
> + /* set a well known return code for detection of child write failure,
> + * i.e. on the new stack
> + */
> child_data->err = 12345678;
>
> /*
> @@ -508,8 +579,10 @@ int copy_context_skas0(unsigned long new_stack, int pid)
> return err;
> }
>
> + /* wait for parents stub_clone_handler() to finish */
> wait_stub_done(pid);
>
> + /* get childs pid, the pid of the cloned parent process */
> pid = data->err;
> if (pid < 0) {
> printk(UM_KERN_ERR "copy_context_skas0 - stub-parent reports "
> diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
> index e9824d5..5a7f49c 100644
> --- a/arch/um/os-Linux/time.c
> +++ b/arch/um/os-Linux/time.c
> @@ -1,4 +1,5 @@
> /*
> + * Copyright (C) 2012-2014 Cisco Systems
> * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
> * Licensed under the GPL
> */
> @@ -10,177 +11,177 @@
> #include <sys/time.h>
> #include <kern_util.h>
> #include <os.h>
> -#include "internal.h"
> +#include <string.h>
> +#include <timer-internal.h>
>
> -int set_interval(void)
> -{
> - int usec = UM_USEC_PER_SEC / UM_HZ;
> - struct itimerval interval = ((struct itimerval) { { 0, usec },
> - { 0, usec } });
> -
> - if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
> - return -errno;
> +static timer_t event_high_res_timer = 0;
>
> - return 0;
> +static inline long long timeval_to_ns(const struct timeval *tv)
> +{
> + return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
> + tv->tv_usec * UM_NSEC_PER_USEC;
> }
>
> -int timer_one_shot(int ticks)
> +static inline long long timespec_to_ns(const struct timespec *ts)
> {
> - unsigned long usec = ticks * UM_USEC_PER_SEC / UM_HZ;
> - unsigned long sec = usec / UM_USEC_PER_SEC;
> - struct itimerval interval;
> -
> - usec %= UM_USEC_PER_SEC;
> - interval = ((struct itimerval) { { 0, 0 }, { sec, usec } });
> + return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) +
> + ts->tv_nsec;
> +}
>
> - if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
> - return -errno;
> +long long os_persistent_clock_emulation (void) {
> + struct timespec realtime_tp;
>
> - return 0;
> + clock_gettime(CLOCK_REALTIME, &realtime_tp);
> + return timespec_to_ns(&realtime_tp);
> }
>
> /**
> - * timeval_to_ns - Convert timeval to nanoseconds
> - * @ts: pointer to the timeval variable to be converted
> - *
> - * Returns the scalar nanosecond representation of the timeval
> - * parameter.
> - *
> - * Ripped from linux/time.h because it's a kernel header, and thus
> - * unusable from here.
> + * os_timer_create() - create an new posix (interval) timer
> */
> -static inline long long timeval_to_ns(const struct timeval *tv)
> -{
> - return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
> - tv->tv_usec * UM_NSEC_PER_USEC;
> -}
> +int os_timer_create(void* timer) {
>
> -long long disable_timer(void)
> -{
> - struct itimerval time = ((struct itimerval) { { 0, 0 }, { 0, 0 } });
> - long long remain, max = UM_NSEC_PER_SEC / UM_HZ;
> + struct sigevent sev;
> + timer_t* t = timer;
>
> - if (setitimer(ITIMER_VIRTUAL, &time, &time) < 0)
> - printk(UM_KERN_ERR "disable_timer - setitimer failed, "
> - "errno = %d\n", errno);
> + if(t == NULL) {
> + t = &event_high_res_timer;
> + }
>
> - remain = timeval_to_ns(&time.it_value);
> - if (remain > max)
> - remain = max;
> + sev.sigev_notify = SIGEV_SIGNAL;
> + sev.sigev_signo = SIGUSR2; /* note - hrtimer now has its own signal */
> + sev.sigev_value.sival_ptr = &event_high_res_timer;
>
> - return remain;
> + if (timer_create(
> + CLOCK_MONOTONIC,
> + &sev,
> + t) == -1) {
> + return -1;
> + }
> + return 0;
> }
>
> -long long os_nsecs(void)
> +int os_timer_set_interval(void* timer, void* i)
> {
> - struct timeval tv;
> + struct itimerspec its;
> + unsigned long long nsec;
> + timer_t* t = timer;
> + struct itimerspec* its_in = i;
>
> - gettimeofday(&tv, NULL);
> - return timeval_to_ns(&tv);
> -}
> + if(t == NULL) {
> + t = &event_high_res_timer;
> + }
> +
> + nsec = UM_NSEC_PER_SEC / UM_HZ;
> +
> + if(its_in != NULL) {
> + its.it_value.tv_sec = its_in->it_value.tv_sec;
> + its.it_value.tv_nsec = its_in->it_value.tv_nsec;
> + } else {
> + its.it_value.tv_sec = 0;
> + its.it_value.tv_nsec = nsec;
> + }
> +
> + its.it_interval.tv_sec = 0;
> + its.it_interval.tv_nsec = nsec;
> +
> + if(timer_settime(*t, 0, &its, NULL) == -1) {
> + return -errno;
> + }
>
> -#ifdef UML_CONFIG_NO_HZ_COMMON
> -static int after_sleep_interval(struct timespec *ts)
> -{
> return 0;
> }
>
> -static void deliver_alarm(void)
> +/**
> + * os_timer_remain() - returns the remaining nano seconds of the given interval
> + * timer
> + * Because this is the remaining time of an interval timer, which correspondends
> + * to HZ, this value can never be bigger than one second. Just
> + * the nanosecond part of the timer is returned.
> + * The returned time is relative to the start time of the interval timer.
> + * Return an negative value in an error case.
> + */
> +long os_timer_remain(void* timer)
> {
> - alarm_handler(SIGVTALRM, NULL, NULL);
> -}
> + struct itimerspec its;
> + timer_t* t = timer;
>
> -static unsigned long long sleep_time(unsigned long long nsecs)
> -{
> - return nsecs;
> -}
> + if(t == NULL) {
> + t = &event_high_res_timer;
> + }
>
> -#else
> -unsigned long long last_tick;
> -unsigned long long skew;
> + if(timer_gettime(t, &its) == -1) {
> + return -errno;
> + }
>
> -static void deliver_alarm(void)
> -{
> - unsigned long long this_tick = os_nsecs();
> - int one_tick = UM_NSEC_PER_SEC / UM_HZ;
> + return its.it_value.tv_nsec;
> +}
>
> - /* Protection against the host's time going backwards */
> - if ((last_tick != 0) && (this_tick < last_tick))
> - this_tick = last_tick;
> +int os_timer_one_shot(int ticks)
> +{
> + struct itimerspec its;
> + unsigned long long nsec;
> + unsigned long sec;
>
> - if (last_tick == 0)
> - last_tick = this_tick - one_tick;
> + nsec = (ticks + 1);
> + sec = nsec / UM_NSEC_PER_SEC;
> + nsec = nsec % UM_NSEC_PER_SEC;
>
> - skew += this_tick - last_tick;
> + its.it_value.tv_sec = nsec / UM_NSEC_PER_SEC;
> + its.it_value.tv_nsec = nsec;
>
> - while (skew >= one_tick) {
> - alarm_handler(SIGVTALRM, NULL, NULL);
> - skew -= one_tick;
> - }
> + its.it_interval.tv_sec = 0;
> + its.it_interval.tv_nsec = 0; // we cheat here
>
> - last_tick = this_tick;
> + timer_settime(event_high_res_timer, 0, &its, NULL);
> + return 0;
> }
>
> -static unsigned long long sleep_time(unsigned long long nsecs)
> +/**
> + * os_timer_disable() - disable the posix (interval) timer
> + * Returns the remaining interval timer time in nanoseconds
> + */
> +long long os_timer_disable(void)
> {
> - return nsecs > skew ? nsecs - skew : 0;
> + struct itimerspec its;
> +
> + memset(&its, 0, sizeof(struct itimerspec));
> + timer_settime(event_high_res_timer, 0, &its, &its);
> +
> + return its.it_value.tv_sec * UM_NSEC_PER_SEC + its.it_value.tv_nsec;
> }
>
> -static inline long long timespec_to_us(const struct timespec *ts)
> +long long os_vnsecs(void)
> {
> - return ((long long) ts->tv_sec * UM_USEC_PER_SEC) +
> - ts->tv_nsec / UM_NSEC_PER_USEC;
> + struct timespec ts;
> +
> + clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&ts);
> + return timespec_to_ns(&ts);
> }
>
> -static int after_sleep_interval(struct timespec *ts)
> +long long os_nsecs(void)
> {
> - int usec = UM_USEC_PER_SEC / UM_HZ;
> - long long start_usecs = timespec_to_us(ts);
> - struct timeval tv;
> - struct itimerval interval;
> -
> - /*
> - * It seems that rounding can increase the value returned from
> - * setitimer to larger than the one passed in. Over time,
> - * this will cause the remaining time to be greater than the
> - * tick interval. If this happens, then just reduce the first
> - * tick to the interval value.
> - */
> - if (start_usecs > usec)
> - start_usecs = usec;
> -
> - start_usecs -= skew / UM_NSEC_PER_USEC;
> - if (start_usecs < 0)
> - start_usecs = 0;
> -
> - tv = ((struct timeval) { .tv_sec = start_usecs / UM_USEC_PER_SEC,
> - .tv_usec = start_usecs % UM_USEC_PER_SEC });
> - interval = ((struct itimerval) { { 0, usec }, tv });
> -
> - if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
> - return -errno;
> + struct timespec ts;
>
> - return 0;
> + clock_gettime(CLOCK_MONOTONIC,&ts);
> + return timespec_to_ns(&ts);
> }
> -#endif
>
> -void idle_sleep(unsigned long long nsecs)
> +/**
> + * os_idle_sleep() - sleep for a given time of nsecs
> + * @nsecs: nanoseconds to sleep
> + */
> +void os_idle_sleep(unsigned long long nsecs)
> {
> struct timespec ts;
>
> - /*
> - * nsecs can come in as zero, in which case, this starts a
> - * busy loop. To prevent this, reset nsecs to the tick
> - * interval if it is zero.
> - */
> - if (nsecs == 0)
> - nsecs = UM_NSEC_PER_SEC / UM_HZ;
> -
> - nsecs = sleep_time(nsecs);
> - ts = ((struct timespec) { .tv_sec = nsecs / UM_NSEC_PER_SEC,
> - .tv_nsec = nsecs % UM_NSEC_PER_SEC });
> -
> - if (nanosleep(&ts, &ts) == 0)
> - deliver_alarm();
> - after_sleep_interval(&ts);
> + if (nsecs <= 0) {
> + return;
> + }
> +
> + ts = ((struct timespec) {
> + .tv_sec = nsecs / UM_NSEC_PER_SEC,
> + .tv_nsec = nsecs % UM_NSEC_PER_SEC
> + });
> +
> + clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
> }
> diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
> index faee55e..10ecc06 100644
> --- a/arch/um/os-Linux/util.c
> +++ b/arch/um/os-Linux/util.c
> @@ -102,6 +102,7 @@ void os_fix_helper_signals(void)
> signal(SIGWINCH, SIG_IGN);
> signal(SIGINT, SIG_DFL);
> signal(SIGTERM, SIG_DFL);
> + signal(SIGUSR2, SIG_IGN);
> }
>
> void os_dump_core(void)
>
>
>
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--
Thanks,
//richard
|