kern_clock.c File Reference

#include <sys/cdefs.h>
#include "opt_kdb.h"
#include "opt_device_polling.h"
#include "opt_hwpmc_hooks.h"
#include "opt_ntp.h"
#include "opt_watchdog.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/epoch.h>
#include <sys/eventhandler.h>
#include <sys/gtaskqueue.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/sdt.h>
#include <sys/signalvar.h>
#include <sys/sleepqueue.h>
#include <sys/smp.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <sys/sysctl.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/limits.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>

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Functions
	__FBSDID ("$FreeBSD$")
	SDT_PROVIDER_DECLARE (sched)
	SDT_PROBE_DEFINE2 (sched,,, tick, "struct thread *", "struct proc *")
static int	sysctl_kern_cp_time (SYSCTL_HANDLER_ARGS)
	SYSCTL_PROC (_kern, OID_AUTO, cp_time, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE, 0, 0, sysctl_kern_cp_time, "LU", "CPU time statistics")
static int	sysctl_kern_cp_times (SYSCTL_HANDLER_ARGS)
	SYSCTL_PROC (_kern, OID_AUTO, cp_times, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE, 0, 0, sysctl_kern_cp_times, "LU", "per-CPU time statistics")
void	read_cpu_time (long *cp_time)
static void	watchdog_fire (void)
static void	watchdog_config (void *, u_int, int *)
static void	watchdog_attach (void)
	DPCPU_DEFINE_STATIC (int, pcputicks)
static void	initclocks (void *dummy __unused)
	SYSINIT (clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
static __noinline void	hardclock_itimer (struct thread *td, struct pstats *pstats, int cnt, int usermode)
void	hardclock (int cnt, int usermode)
void	hardclock_sync (int cpu)
int	tvtohz (struct timeval *tv)
void	startprofclock (struct proc *p)
void	stopprofclock (struct proc *p)
void	statclock (int cnt, int usermode)
void	profclock (int cnt, int usermode, uintfptr_t pc)
static int	sysctl_kern_clockrate (SYSCTL_HANDLER_ARGS)
	SYSCTL_PROC (_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD|CTLFLAG_MPSAFE, 0, 0, sysctl_kern_clockrate, "S,clockinfo", "Rate and period of various kernel clocks")
static void	watchdog_config (void *unused __unused, u_int cmd, int *error)

Variables
static struct mtx	time_lock
static long	empty [CPUSTATES]
static int	watchdog_ticks
static int	watchdog_enabled
int	stathz
int	profhz
int	profprocs
volatile int	ticks
int	psratio

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

DPCPU_DEFINE_STATIC()

DPCPU_DEFINE_STATIC	(	int	,
		pcputicks
	)

hardclock()

void hardclock	(	int	cnt,
		int	usermode
	)

Definition at line 453 of file kern_clock.c.

References clk_intr_event, clock, cpu_tick_calibration(), hardclock_device_poll(), hardclock_itimer(), intr_event_handle(), tc_ticktock(), ticks, watchdog_enabled, watchdog_fire(), and watchdog_ticks.

Referenced by handleevents().

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hardclock_itimer()

static __noinline void hardclock_itimer ( struct thread *  td, struct pstats *  pstats, int  cnt, int  usermode  )

static

Definition at line 423 of file kern_clock.c.

References flags, itimerdecr(), and tick.

Referenced by hardclock().

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hardclock_sync()

void hardclock_sync

(

int

cpu

)

Definition at line 516 of file kern_clock.c.

References ticks.

Referenced by configtimer(), and cpu_initclocks_ap().

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initclocks()

static void initclocks ( void *dummy  __unused )

static

Definition at line 392 of file kern_clock.c.

References hz, profhz, psratio, stathz, time_lock, and watchdog_attach().

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profclock()

void profclock	(	int	cnt,
		int	usermode,
		uintfptr_t	pc
	)

Definition at line 721 of file kern_clock.c.

References addupc_intr(), and clock.

Referenced by handleevents().

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read_cpu_time()

void read_cpu_time

(

long *

cp_time

)

Definition at line 318 of file kern_clock.c.

References pcpu_find().

Referenced by sysctl_kern_cp_time().

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SDT_PROBE_DEFINE2()

SDT_PROBE_DEFINE2	(	sched	,
		tick	,
		"struct thread *"	,
		"struct proc *"
	)

SDT_PROVIDER_DECLARE()

SDT_PROVIDER_DECLARE

(

sched

)

startprofclock()

void startprofclock

(

struct proc *

p

)

Definition at line 589 of file kern_clock.c.

References cpu_startprofclock(), profprocs, and time_lock.

Referenced by do_fork(), and sys_profil().

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statclock()

void statclock	(	int	cnt,
		int	usermode
	)

Definition at line 637 of file kern_clock.c.

References clock, cpu_ticks, hz, sched_clock(), sched_tdname(), stathz, and tick.

Referenced by handleevents().

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stopprofclock()

void stopprofclock

(

struct proc *

p

)

Definition at line 608 of file kern_clock.c.

References cpu_stopprofclock(), profprocs, and time_lock.

Referenced by addupc_task(), do_execve(), exit1(), and sys_profil().

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sysctl_kern_clockrate()

static int sysctl_kern_clockrate ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 764 of file kern_clock.c.

References hz, profhz, stathz, sysctl_handle_opaque(), and tick.

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sysctl_kern_cp_time()

static int sysctl_kern_cp_time ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 100 of file kern_clock.c.

References read_cpu_time().

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sysctl_kern_cp_times()

static int sysctl_kern_cp_times ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 133 of file kern_clock.c.

References empty, mp_maxid, and pcpu_find().

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SYSCTL_PROC() [1/3]

SYSCTL_PROC	(	_kern	,
		KERN_CLOCKRATE	,
		clockrate	,
		CTLTYPE_STRUCT|CTLFLAG_RD|	CTLFLAG_MPSAFE,
		0	,
		0	,
		sysctl_kern_clockrate	,
		"	S,
		clockinfo"	,
		"Rate and period of various kernel clocks"
	)

SYSCTL_PROC() [2/3]

SYSCTL_PROC	(	_kern	,
		OID_AUTO	,
		cp_time	,
		CTLTYPE_LONG|CTLFLAG_RD|	CTLFLAG_MPSAFE,
		0	,
		0	,
		sysctl_kern_cp_time	,
		"LU"	,
		"CPU time statistics"
	)

SYSCTL_PROC() [3/3]

SYSCTL_PROC	(	_kern	,
		OID_AUTO	,
		cp_times	,
		CTLTYPE_LONG|CTLFLAG_RD|	CTLFLAG_MPSAFE,
		0	,
		0	,
		sysctl_kern_cp_times	,
		"LU"	,
		"per-CPU time statistics"
	)

SYSINIT()

SYSINIT	(	clocks	,
		SI_SUB_CLOCKS	,
		SI_ORDER_FIRST	,
		initclocks	,
		NULL
	)

tvtohz()

int tvtohz

(

struct timeval *

tv

)

Definition at line 529 of file kern_clock.c.

References hz, printf(), tick, and ticks.

Referenced by kern_aio_suspend(), kern_aio_waitcomplete(), kern_sem_wait(), kern_sigtimedwait(), kern_thr_suspend(), mqueue_receive(), mqueue_send(), pps_fetch(), realtimer_expire_l(), realtimer_settime(), tstohz(), and ttydisc_read_raw_read_timer().

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watchdog_attach()

static void watchdog_attach ( void  )

static

Definition at line 340 of file kern_clock.c.

References watchdog_config().

Referenced by initclocks().

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watchdog_config() [1/2]

static void watchdog_config ( void *  , u_int  , int *    )

static

Referenced by watchdog_attach().

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watchdog_config() [2/2]

static void watchdog_config ( void *unused  __unused, u_int  cmd, int *  error  )

static

Definition at line 784 of file kern_clock.c.

References hz, watchdog_enabled, and watchdog_ticks.

watchdog_fire()

static void watchdog_fire ( void  )

static

Definition at line 803 of file kern_clock.c.

References kdb_backtrace(), kdb_enter(), panic(), and printf().

Referenced by hardclock().

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Variable Documentation

empty

long empty[CPUSTATES]

static

Definition at line 130 of file kern_clock.c.

Referenced by domainset_empty_vm(), sysctl_kern_cp_times(), and turnstile_signal().

profhz

int profhz

Definition at line 378 of file kern_clock.c.

Referenced by cpu_initclocks_bsp(), initclocks(), setuptimer(), and sysctl_kern_clockrate().

profprocs

int profprocs

Definition at line 379 of file kern_clock.c.

Referenced by startprofclock(), and stopprofclock().

psratio

int psratio

Definition at line 381 of file kern_clock.c.

Referenced by initclocks(), and userret().

stathz

int stathz

Definition at line 377 of file kern_clock.c.

Referenced by cpu_initclocks_bsp(), initclocks(), sched_initticks(), setuptimer(), statclock(), and sysctl_kern_clockrate().

ticks

volatile int ticks

Definition at line 380 of file kern_clock.c.

Referenced by addupc_intr(), addupc_task(), cache_enter_time(), cache_lookup_dot(), counter_ratecheck(), do_fork(), dotrace(), fill_kinfo_proc_only(), fill_kinfo_thread(), hardclock(), hardclock_sync(), init_param1(), ktls_buffer_alloc(), mi_switch(), pidctrl_classic(), pidctrl_daemon(), ppsratecheck(), proc0_post(), sched_ap_entry(), sched_pctcpu_update(), sched_sleep(), sched_switch(), sched_wakeup(), schedinit(), should_yield(), smr_create(), smr_lazy_advance(), taskqueue_enqueue_timeout(), thread_exit(), thread_reap_callout_cb(), thread_reap_domain(), turnstile_wait(), and tvtohz().

time_lock

struct mtx time_lock

static

Definition at line 94 of file kern_clock.c.

Referenced by initclocks(), startprofclock(), and stopprofclock().

watchdog_enabled

int watchdog_enabled

static

Definition at line 335 of file kern_clock.c.

Referenced by hardclock(), and watchdog_config().

watchdog_ticks

int watchdog_ticks

static

Definition at line 334 of file kern_clock.c.

Referenced by hardclock(), and watchdog_config().