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| author | Jan Glauber <jan.glauber@de.ibm.com> | 2008-04-17 07:46:16 +0200 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-04-17 07:47:02 +0200 |
| commit | c0015f91d8414f55d2debfe9984a04b98b48f087 (patch) | |
| tree | 114cfd865dda4b1c5860391c219a1b34dc74eacb | |
| parent | 2f7c8bd6dc6540aa3275c0ad9f657401985c00e9 (diff) | |
| download | linux-c0015f91d8414f55d2debfe9984a04b98b48f087.tar.gz linux-c0015f91d8414f55d2debfe9984a04b98b48f087.tar.bz2 linux-c0015f91d8414f55d2debfe9984a04b98b48f087.zip | |
[S390] switch sched_clock to store-clock-extended.
Add get_clock_xt to read an 8 byte clock value using store clock
extended (STCKE) and use get_clock_xt for sched_clock. STCKE should
be faster than STCK on newer machines.
Signed-off-by: Jan Glauber <jan.glauber@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| -rw-r--r-- | arch/s390/kernel/time.c | 2 | ||||
| -rw-r--r-- | include/asm-s390/timex.h | 12 |
2 files changed, 8 insertions, 6 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index cb232c155360..925f9dc0b0a0 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -66,7 +66,7 @@ static u64 xtime_cc; */ unsigned long long sched_clock(void) { - return ((get_clock() - jiffies_timer_cc) * 125) >> 9; + return ((get_clock_xt() - jiffies_timer_cc) * 125) >> 9; } /* diff --git a/include/asm-s390/timex.h b/include/asm-s390/timex.h index 98229db24314..6dd7eecbb8e4 100644 --- a/include/asm-s390/timex.h +++ b/include/asm-s390/timex.h @@ -62,16 +62,18 @@ static inline unsigned long long get_clock (void) return clk; } -static inline void get_clock_extended(void *dest) +static inline unsigned long long get_clock_xt(void) { - typedef struct { unsigned long long clk[2]; } __clock_t; + unsigned char clk[16]; #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) - asm volatile("stcke %0" : "=Q" (*((__clock_t *)dest)) : : "cc"); + asm volatile("stcke %0" : "=Q" (clk) : : "cc"); #else /* __GNUC__ */ - asm volatile("stcke 0(%1)" : "=m" (*((__clock_t *)dest)) - : "a" ((__clock_t *)dest) : "cc"); + asm volatile("stcke 0(%1)" : "=m" (clk) + : "a" (clk) : "cc"); #endif /* __GNUC__ */ + + return *((unsigned long long *)&clk[1]); } static inline cycles_t get_cycles(void) |