Messages in this thread | | | Date | Mon, 26 Oct 2015 12:19:31 +0530 | Subject | How is jiffies upation while holding spinlock in Uniprocessor or SMP environment? | From | raghu MG <> |
| |
Hello, I have couple of questions. 1) In case of UP how is jiffies(timer) get updated while holding spin lock using spinlock_irq_save?
2)My understanding is in smp environment jiffies updation cannot be done on processor holding spinlock irrespective of spinlock API.So timer interrupt should be enabled across all cores in SoC. Imagine a scenario in quad core processor where 4 cores are holding 4 different spinlocks & how is the timer interrupt for jiffies handled?
| |