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D48383.1779188611.diff
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D48383.1779188611.diff
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diff --git a/sys/amd64/amd64/support.S b/sys/amd64/amd64/support.S
--- a/sys/amd64/amd64/support.S
+++ b/sys/amd64/amd64/support.S
@@ -41,6 +41,16 @@
#include "assym.inc"
+ .data
+ .globl ticksl
+ .type ticksl, @object
+ .globl ticks
+ .type ticks, @object
+ticksl: .long 0
+ .size ticksl, 8
+ticks =ticksl
+ .size ticks, 4
+
.text
/* Address: %rdi */
diff --git a/sys/i386/i386/support.S b/sys/i386/i386/support.S
--- a/sys/i386/i386/support.S
+++ b/sys/i386/i386/support.S
@@ -36,6 +36,16 @@
#define IDXSHIFT 10
+ .data
+ .globl ticksl
+ .type ticksl, @object
+ .globl ticks
+ .type ticks, @object
+ticksl: .long 0
+ .size ticksl, 4
+ticks =ticksl
+ .size ticks, 4
+
.text
ENTRY(sse2_pagezero)
diff --git a/sys/kern/kern_clock.c b/sys/kern/kern_clock.c
--- a/sys/kern/kern_clock.c
+++ b/sys/kern/kern_clock.c
@@ -323,7 +323,7 @@
#include <sys/watchdog.h>
-static int watchdog_ticks;
+static long watchdog_ticks;
static int watchdog_enabled;
static void watchdog_fire(void);
static void watchdog_config(void *, u_int, int *);
@@ -369,10 +369,9 @@
int stathz;
int profhz;
int profprocs;
-volatile int ticks;
int psratio;
-DPCPU_DEFINE_STATIC(int, pcputicks); /* Per-CPU version of ticks. */
+DPCPU_DEFINE_STATIC(long, pcputicks); /* Per-CPU version of ticks. */
#ifdef DEVICE_POLLING
static int devpoll_run = 0;
#endif
@@ -480,14 +479,14 @@
struct pstats *pstats;
struct thread *td = curthread;
struct proc *p = td->td_proc;
- int *t = DPCPU_PTR(pcputicks);
- int global, i, newticks;
+ long global, i, newticks, *t;
/*
* Update per-CPU and possibly global ticks values.
*/
+ t = DPCPU_PTR(pcputicks);
*t += cnt;
- global = ticks;
+ global = atomic_load_long(&ticksl);
do {
newticks = *t - global;
if (newticks <= 0) {
@@ -496,7 +495,7 @@
newticks = 0;
break;
}
- } while (!atomic_fcmpset_int(&ticks, &global, *t));
+ } while (!atomic_fcmpset_long(&ticksl, &global, *t));
/*
* Run current process's virtual and profile time, as needed.
@@ -525,7 +524,7 @@
}
#endif /* DEVICE_POLLING */
if (watchdog_enabled > 0) {
- i = atomic_fetchadd_int(&watchdog_ticks, -newticks);
+ i = atomic_fetchadd_long(&watchdog_ticks, -newticks);
if (i > 0 && i <= newticks)
watchdog_fire();
}
@@ -540,11 +539,12 @@
void
hardclock_sync(int cpu)
{
- int *t;
+ long *t;
+
KASSERT(!CPU_ABSENT(cpu), ("Absent CPU %d", cpu));
- t = DPCPU_ID_PTR(cpu, pcputicks);
- *t = ticks;
+ t = DPCPU_ID_PTR(cpu, pcputicks);
+ *t = ticksl;
}
/*
diff --git a/sys/kern/subr_param.c b/sys/kern/subr_param.c
--- a/sys/kern/subr_param.c
+++ b/sys/kern/subr_param.c
@@ -193,11 +193,13 @@
tick_bt = sbttobt(tick_sbt);
tick_seconds_max = INT_MAX / hz;
+#if LONG_MAX == 0x7fffffffL
/*
* Arrange for ticks to wrap 10 minutes after boot to help catch
- * sign problems sooner.
+ * sign problems sooner on platforms where ticksl is 32 bits wide.
*/
- ticks = INT_MAX - (hz * 10 * 60);
+ ticksl = LONG_MAX - (hz * 10 * 60);
+#endif
vn_lock_pair_pause_max = hz / 100;
if (vn_lock_pair_pause_max == 0)
diff --git a/sys/sys/kernel.h b/sys/sys/kernel.h
--- a/sys/sys/kernel.h
+++ b/sys/sys/kernel.h
@@ -65,7 +65,17 @@
extern int stathz; /* statistics clock's frequency */
extern int profhz; /* profiling clock's frequency */
extern int profprocs; /* number of process's profiling */
+
+/*
+ * The ticks and ticksl symbols overlap, giving a 64-bit tick counter on 64-bit
+ * platforms while still maintaining compatibility with the legacy 32-bit
+ * counter. Either can be used; 32-bit values of course require less space, but
+ * rollover must be handled: the value can roll over in a little under 25 days
+ * at 1000Hz. In general it's better to use ticksl unless there's a specific
+ * need to do otherwise.
+ */
extern volatile int ticks;
+extern volatile long ticksl;
#endif /* _KERNEL */

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