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LoongArch: Reduce min_delta for the arch clockevent device

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Now the min_delta is 0x600 (1536) for LoongArch's constant clockevent
device. For a 100MHz hardware timer this means ~15us. This is a little
big, especially for PREEMPT_RT enabled kernels. So reduce it to 100 for
PREEMPT_RT kernel, and 1000 for others (we don't want too small values
to affect performance).

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2024-11-22 15:47:48 +08:00
parent 73c359d1d3
commit af4b67da65
1 changed files with 5 additions and 1 deletions
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6
arch/loongarch/kernel/time.c
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@ -127,7 +127,11 @@ void sync_counter(void)
int constant_clockevent_init(void)
{
unsigned int cpu = smp_processor_id();
unsigned long min_delta = 0x600;
#ifdef CONFIG_PREEMPT_RT
unsigned long min_delta = 100;
#else
unsigned long min_delta = 1000;
#endif
unsigned long max_delta = (1UL << 48) - 1;
struct clock_event_device *cd;
static int irq = 0, timer_irq_installed = 0;