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dde_linux: update jiffies in cpu_relax on x86/pc

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This commit is contained in:
Alexander Boettcher 2024-04-24 14:41:14 +02:00 committed by Christian Helmuth
parent e350dc27e9
commit 72bb960c2a
3 changed files with 33 additions and 1 deletions
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2
repos/dde_linux/src/include/lx_emul/shadow/arch/x86/include/asm/vdso/processor.h
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@ -23,7 +23,7 @@ static __always_inline void cpu_relax(void)
* endless busy loops like:
* - slchi() in drivers/i2c/algos/i2c-algo-bit.c
*/
if (!lx_emul_irq_state()) lx_emul_time_update_jiffies();
if (!lx_emul_irq_state()) lx_emul_time_update_jiffies_cpu_relax();
}
#endif /* _LX_EMUL__SHADOW__ARCH__X86__INCLUDE__ASM__VDSO__PROCESSOR_H_ */

2
repos/dde_linux/src/include/lx_emul/time.h
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@ -32,6 +32,8 @@ void lx_emul_time_update_jiffies(void);
void lx_emul_time_initial(unsigned long long);
void lx_emul_time_update_jiffies_cpu_relax(void);
#ifdef __cplusplus
}
#endif

30
repos/dde_linux/src/lib/lx_emul/clocksource.c
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@ -134,6 +134,36 @@ void lx_emul_time_update_jiffies(void)
}
extern void update_wall_time(void);
void lx_emul_time_update_jiffies_cpu_relax()
{
/* based upon tick_do_update_jiffies64 in kernel/time/tick-sched.c */
ktime_t delta, now = ktime_get();
/* check if jiffies need an update */
if (ktime_before(now, tick_next_period))
return;
delta = ktime_sub(now, tick_next_period);
if (unlikely(delta >= TICK_NSEC)) {
/* Slow path for long idle sleep times */
s64 incr = TICK_NSEC;
ktime_t ticks = ktime_divns(delta, incr);
jiffies_64 += ticks;
tick_next_period = ktime_add_ns(tick_next_period, incr * ticks);
update_wall_time();
}
}
enum { LX_EMUL_MAX_OF_CLOCK_PROVIDERS = 256 };