On 9/17/25 7:38 AM, Masami Hiramatsu (Google) wrote:
>> + # TASK-PID CPU# ||||| TIMESTAMP FUNCTION
>> + # | | | ||||| | |
>> + <idle>-0 [000] d.Z1. 717.026259: my_jiffies:
>> (tick_do_update_jiffies64+0xbe/0x130)
>> + <idle>-0 [000] d.Z1. 717.026373: my_jiffies:
>> (tick_do_update_jiffies64+0xbe/0x130)
>> +
>> +You can see the code which writes to `jiffies` is `do_timer()`.
> I'm having trouble getting from tick_do_update_jiffies64+0xbe/0x130,
> which I expect is
> jiffies_64 += ticks;
> in that function, over to do_timer(), which also updates jiffies_64,
> but is not called by tick_do_update_jiffies64(). AFAICT, there are
> no calls to do_timer() in the file (kernel/time/tick-sched.c).
>
> Can you explain, please?
Let me try this again.
I understand the stack (call) trace/dump and your explanation, but
then your next comment says:
+You can see the code which writes to `jiffies` is `do_timer()`.
Does that need to be corrected?
thanks.
--
~Randy
