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-rw-r--r--arch/s390/include/asm/cputime.h42
-rw-r--r--arch/s390/include/asm/lowcore.h40
-rw-r--r--arch/s390/include/asm/system.h4
-rw-r--r--arch/s390/include/asm/thread_info.h2
-rw-r--r--arch/s390/kernel/vtime.c93
5 files changed, 85 insertions, 96 deletions
diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h
index 133ce054fc89..521726430afa 100644
--- a/arch/s390/include/asm/cputime.h
+++ b/arch/s390/include/asm/cputime.h
@@ -11,7 +11,7 @@
#include <asm/div64.h>
-/* We want to use micro-second resolution. */
+/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
typedef unsigned long long cputime_t;
typedef unsigned long long cputime64_t;
@@ -53,9 +53,9 @@ __div(unsigned long long n, unsigned int base)
#define cputime_ge(__a, __b) ((__a) >= (__b))
#define cputime_lt(__a, __b) ((__a) < (__b))
#define cputime_le(__a, __b) ((__a) <= (__b))
-#define cputime_to_jiffies(__ct) (__div((__ct), 1000000 / HZ))
+#define cputime_to_jiffies(__ct) (__div((__ct), 4096000000ULL / HZ))
#define cputime_to_scaled(__ct) (__ct)
-#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (1000000 / HZ))
+#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (4096000000ULL / HZ))
#define cputime64_zero (0ULL)
#define cputime64_add(__a, __b) ((__a) + (__b))
@@ -64,7 +64,7 @@ __div(unsigned long long n, unsigned int base)
static inline u64
cputime64_to_jiffies64(cputime64_t cputime)
{
- do_div(cputime, 1000000 / HZ);
+ do_div(cputime, 4096000000ULL / HZ);
return cputime;
}
@@ -74,13 +74,13 @@ cputime64_to_jiffies64(cputime64_t cputime)
static inline unsigned int
cputime_to_msecs(const cputime_t cputime)
{
- return __div(cputime, 1000);
+ return __div(cputime, 4096000);
}
static inline cputime_t
msecs_to_cputime(const unsigned int m)
{
- return (cputime_t) m * 1000;
+ return (cputime_t) m * 4096000;
}
/*
@@ -89,13 +89,13 @@ msecs_to_cputime(const unsigned int m)
static inline unsigned int
cputime_to_secs(const cputime_t cputime)
{
- return __div(cputime, 1000000);
+ return __div(cputime, 2048000000) >> 1;
}
static inline cputime_t
secs_to_cputime(const unsigned int s)
{
- return (cputime_t) s * 1000000;
+ return (cputime_t) s * 4096000000ULL;
}
/*
@@ -104,7 +104,7 @@ secs_to_cputime(const unsigned int s)
static inline cputime_t
timespec_to_cputime(const struct timespec *value)
{
- return value->tv_nsec / 1000 + (u64) value->tv_sec * 1000000;
+ return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL;
}
static inline void
@@ -114,12 +114,12 @@ cputime_to_timespec(const cputime_t cputime, struct timespec *value)
register_pair rp;
rp.pair = cputime >> 1;
- asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1));
- value->tv_nsec = rp.subreg.even * 1000;
+ asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
+ value->tv_nsec = rp.subreg.even * 1000 / 4096;
value->tv_sec = rp.subreg.odd;
#else
- value->tv_nsec = (cputime % 1000000) * 1000;
- value->tv_sec = cputime / 1000000;
+ value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096;
+ value->tv_sec = cputime / 4096000000ULL;
#endif
}
@@ -131,7 +131,7 @@ cputime_to_timespec(const cputime_t cputime, struct timespec *value)
static inline cputime_t
timeval_to_cputime(const struct timeval *value)
{
- return value->tv_usec + (u64) value->tv_sec * 1000000;
+ return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL;
}
static inline void
@@ -141,12 +141,12 @@ cputime_to_timeval(const cputime_t cputime, struct timeval *value)
register_pair rp;
rp.pair = cputime >> 1;
- asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1));
- value->tv_usec = rp.subreg.even;
+ asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
+ value->tv_usec = rp.subreg.even / 4096;
value->tv_sec = rp.subreg.odd;
#else
- value->tv_usec = cputime % 1000000;
- value->tv_sec = cputime / 1000000;
+ value->tv_usec = cputime % 4096000000ULL;
+ value->tv_sec = cputime / 4096000000ULL;
#endif
}
@@ -156,13 +156,13 @@ cputime_to_timeval(const cputime_t cputime, struct timeval *value)
static inline clock_t
cputime_to_clock_t(cputime_t cputime)
{
- return __div(cputime, 1000000 / USER_HZ);
+ return __div(cputime, 4096000000ULL / USER_HZ);
}
static inline cputime_t
clock_t_to_cputime(unsigned long x)
{
- return (cputime_t) x * (1000000 / USER_HZ);
+ return (cputime_t) x * (4096000000ULL / USER_HZ);
}
/*
@@ -171,7 +171,7 @@ clock_t_to_cputime(unsigned long x)
static inline clock_t
cputime64_to_clock_t(cputime64_t cputime)
{
- return __div(cputime, 1000000 / USER_HZ);
+ return __div(cputime, 4096000000ULL / USER_HZ);
}
#endif /* _S390_CPUTIME_H */
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index 0bc51d52a899..a547817cf1ab 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -67,11 +67,11 @@
#define __LC_SYNC_ENTER_TIMER 0x248
#define __LC_ASYNC_ENTER_TIMER 0x250
#define __LC_EXIT_TIMER 0x258
-#define __LC_LAST_UPDATE_TIMER 0x260
-#define __LC_USER_TIMER 0x268
-#define __LC_SYSTEM_TIMER 0x270
-#define __LC_LAST_UPDATE_CLOCK 0x278
-#define __LC_STEAL_CLOCK 0x280
+#define __LC_USER_TIMER 0x260
+#define __LC_SYSTEM_TIMER 0x268
+#define __LC_STEAL_TIMER 0x270
+#define __LC_LAST_UPDATE_TIMER 0x278
+#define __LC_LAST_UPDATE_CLOCK 0x280
#define __LC_RETURN_MCCK_PSW 0x288
#define __LC_KERNEL_STACK 0xC40
#define __LC_THREAD_INFO 0xC44
@@ -89,11 +89,11 @@
#define __LC_SYNC_ENTER_TIMER 0x250
#define __LC_ASYNC_ENTER_TIMER 0x258
#define __LC_EXIT_TIMER 0x260
-#define __LC_LAST_UPDATE_TIMER 0x268
-#define __LC_USER_TIMER 0x270
-#define __LC_SYSTEM_TIMER 0x278
-#define __LC_LAST_UPDATE_CLOCK 0x280
-#define __LC_STEAL_CLOCK 0x288
+#define __LC_USER_TIMER 0x268
+#define __LC_SYSTEM_TIMER 0x270
+#define __LC_STEAL_TIMER 0x278
+#define __LC_LAST_UPDATE_TIMER 0x280
+#define __LC_LAST_UPDATE_CLOCK 0x288
#define __LC_RETURN_MCCK_PSW 0x290
#define __LC_KERNEL_STACK 0xD40
#define __LC_THREAD_INFO 0xD48
@@ -252,11 +252,11 @@ struct _lowcore
__u64 sync_enter_timer; /* 0x248 */
__u64 async_enter_timer; /* 0x250 */
__u64 exit_timer; /* 0x258 */
- __u64 last_update_timer; /* 0x260 */
- __u64 user_timer; /* 0x268 */
- __u64 system_timer; /* 0x270 */
- __u64 last_update_clock; /* 0x278 */
- __u64 steal_clock; /* 0x280 */
+ __u64 user_timer; /* 0x260 */
+ __u64 system_timer; /* 0x268 */
+ __u64 steal_timer; /* 0x270 */
+ __u64 last_update_timer; /* 0x278 */
+ __u64 last_update_clock; /* 0x280 */
psw_t return_mcck_psw; /* 0x288 */
__u8 pad8[0xc00-0x290]; /* 0x290 */
@@ -343,11 +343,11 @@ struct _lowcore
__u64 sync_enter_timer; /* 0x250 */
__u64 async_enter_timer; /* 0x258 */
__u64 exit_timer; /* 0x260 */
- __u64 last_update_timer; /* 0x268 */
- __u64 user_timer; /* 0x270 */
- __u64 system_timer; /* 0x278 */
- __u64 last_update_clock; /* 0x280 */
- __u64 steal_clock; /* 0x288 */
+ __u64 user_timer; /* 0x268 */
+ __u64 system_timer; /* 0x270 */
+ __u64 steal_timer; /* 0x278 */
+ __u64 last_update_timer; /* 0x280 */
+ __u64 last_update_clock; /* 0x288 */
psw_t return_mcck_psw; /* 0x290 */
__u8 pad8[0xc00-0x2a0]; /* 0x2a0 */
/* System info area */
diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h
index 024ef42ed6d7..3a8b26eb1f2e 100644
--- a/arch/s390/include/asm/system.h
+++ b/arch/s390/include/asm/system.h
@@ -99,7 +99,7 @@ static inline void restore_access_regs(unsigned int *acrs)
prev = __switch_to(prev,next); \
} while (0)
-extern void account_vtime(struct task_struct *);
+extern void account_vtime(struct task_struct *, struct task_struct *);
extern void account_tick_vtime(struct task_struct *);
extern void account_system_vtime(struct task_struct *);
@@ -121,7 +121,7 @@ static inline void cmma_init(void) { }
#define finish_arch_switch(prev) do { \
set_fs(current->thread.mm_segment); \
- account_vtime(prev); \
+ account_vtime(prev, current); \
} while (0)
#define nop() asm volatile("nop")
diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index c1eaf9604da7..c544aa524535 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -47,6 +47,8 @@ struct thread_info {
unsigned int cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
struct restart_block restart_block;
+ __u64 user_timer;
+ __u64 system_timer;
};
/*
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 4a4a34caec55..1254a4d0d762 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -31,11 +31,10 @@ static DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer);
* Update process times based on virtual cpu times stored by entry.S
* to the lowcore fields user_timer, system_timer & steal_clock.
*/
-void account_process_tick(struct task_struct *tsk, int user_tick)
+static void do_account_vtime(struct task_struct *tsk, int hardirq_offset)
{
- cputime_t cputime;
- __u64 timer, clock;
- int rcu_user_flag;
+ struct thread_info *ti = task_thread_info(tsk);
+ __u64 timer, clock, user, system, steal;
timer = S390_lowcore.last_update_timer;
clock = S390_lowcore.last_update_clock;
@@ -44,59 +43,47 @@ void account_process_tick(struct task_struct *tsk, int user_tick)
: "=m" (S390_lowcore.last_update_timer),
"=m" (S390_lowcore.last_update_clock) );
S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
- S390_lowcore.steal_clock += S390_lowcore.last_update_clock - clock;
+ S390_lowcore.steal_timer += S390_lowcore.last_update_clock - clock;
- cputime = S390_lowcore.user_timer >> 12;
- rcu_user_flag = cputime != 0;
- S390_lowcore.user_timer -= cputime << 12;
- S390_lowcore.steal_clock -= cputime << 12;
- account_user_time(tsk, cputime, cputime);
+ user = S390_lowcore.user_timer - ti->user_timer;
+ S390_lowcore.steal_timer -= user;
+ ti->user_timer = S390_lowcore.user_timer;
+ account_user_time(tsk, user, user);
- cputime = S390_lowcore.system_timer >> 12;
- S390_lowcore.system_timer -= cputime << 12;
- S390_lowcore.steal_clock -= cputime << 12;
+ system = S390_lowcore.system_timer - ti->system_timer;
+ S390_lowcore.steal_timer -= system;
+ ti->system_timer = S390_lowcore.system_timer;
if (idle_task(smp_processor_id()) != current)
- account_system_time(tsk, HARDIRQ_OFFSET, cputime, cputime);
+ account_system_time(tsk, hardirq_offset, system, system);
else
- account_idle_time(cputime);
+ account_idle_time(system);
- cputime = S390_lowcore.steal_clock;
- if ((__s64) cputime > 0) {
- cputime >>= 12;
- S390_lowcore.steal_clock -= cputime << 12;
+ steal = S390_lowcore.steal_timer;
+ if ((s64) steal > 0) {
+ S390_lowcore.steal_timer = 0;
if (idle_task(smp_processor_id()) != current)
- account_steal_time(cputime);
+ account_steal_time(steal);
else
- account_idle_time(cputime);
+ account_idle_time(steal);
}
}
-/*
- * Update process times based on virtual cpu times stored by entry.S
- * to the lowcore fields user_timer, system_timer & steal_clock.
- */
-void account_vtime(struct task_struct *tsk)
+void account_vtime(struct task_struct *prev, struct task_struct *next)
{
- cputime_t cputime;
- __u64 timer;
-
- timer = S390_lowcore.last_update_timer;
- asm volatile (" STPT %0" /* Store current cpu timer value */
- : "=m" (S390_lowcore.last_update_timer) );
- S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
-
- cputime = S390_lowcore.user_timer >> 12;
- S390_lowcore.user_timer -= cputime << 12;
- S390_lowcore.steal_clock -= cputime << 12;
- account_user_time(tsk, cputime, cputime);
+ struct thread_info *ti;
+
+ do_account_vtime(prev, 0);
+ ti = task_thread_info(prev);
+ ti->user_timer = S390_lowcore.user_timer;
+ ti->system_timer = S390_lowcore.system_timer;
+ ti = task_thread_info(next);
+ S390_lowcore.user_timer = ti->user_timer;
+ S390_lowcore.system_timer = ti->system_timer;
+}
- cputime = S390_lowcore.system_timer >> 12;
- S390_lowcore.system_timer -= cputime << 12;
- S390_lowcore.steal_clock -= cputime << 12;
- if (idle_task(smp_processor_id()) != current)
- account_system_time(tsk, 0, cputime, cputime);
- else
- account_idle_time(cputime);
+void account_process_tick(struct task_struct *tsk, int user_tick)
+{
+ do_account_vtime(tsk, HARDIRQ_OFFSET);
}
/*
@@ -105,21 +92,21 @@ void account_vtime(struct task_struct *tsk)
*/
void account_system_vtime(struct task_struct *tsk)
{
- cputime_t cputime;
- __u64 timer;
+ struct thread_info *ti = task_thread_info(tsk);
+ __u64 timer, system;
timer = S390_lowcore.last_update_timer;
asm volatile (" STPT %0" /* Store current cpu timer value */
: "=m" (S390_lowcore.last_update_timer) );
S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
- cputime = S390_lowcore.system_timer >> 12;
- S390_lowcore.system_timer -= cputime << 12;
- S390_lowcore.steal_clock -= cputime << 12;
+ system = S390_lowcore.system_timer - ti->system_timer;
+ S390_lowcore.steal_timer -= system;
+ ti->system_timer = S390_lowcore.system_timer;
if (in_irq() || idle_task(smp_processor_id()) != current)
- account_system_time(tsk, 0, cputime, cputime);
+ account_system_time(tsk, 0, system, system);
else
- account_idle_time(cputime);
+ account_idle_time(system);
}
EXPORT_SYMBOL_GPL(account_system_vtime);
@@ -490,8 +477,8 @@ void init_cpu_vtimer(void)
/* kick the virtual timer */
S390_lowcore.exit_timer = VTIMER_MAX_SLICE;
S390_lowcore.last_update_timer = VTIMER_MAX_SLICE;
- asm volatile ("SPT %0" : : "m" (S390_lowcore.last_update_timer));
asm volatile ("STCK %0" : "=m" (S390_lowcore.last_update_clock));
+ asm volatile ("SPT %0" : : "m" (S390_lowcore.last_update_timer));
/* enable cpu timer interrupts */
__ctl_set_bit(0,10);
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