__aeabi_uldivmod undefined on 32-bit ARM when compiling with clang about cacule-cpu-scheduler

[raykzhao]

Just tried with gcc on my Raspberry Pi and got the same issue.

[hamadmarri]

Hi Raymond,

Yes, it looks like the division of u64 is the problem. I will try to fix it soon.

By the way what patch revision are you using? Have you encountered any freezes or hangups while cpus on heavy load?

Thanks,

[raykzhao]

Hi.

I am using the 5.8-r2, and so far I have not encountered any freezes/hangups during the heavy load e.g. compiling the kernel.

Regards,
Raymond

[hamadmarri]

Hi @raykzhao ,

Could you please try the attached patch
on top of https://github.com/hamadmarri/cachy-sched/blob/master/patches/cachy/v5.8/cachy-5.8-r5.patch

cachy-5.8-32bit-r5.zip

[raykzhao]

Hi.

It works. Thank you!

Regards,
Raymond

[hamadmarri]

I suggest to tune the hrrn_max_lifetime in 32bit hardware to 4s because the maximum life time can unsigned int hold is roughly 4.29s

sudo sysctl kernel.sched_hrrn_max_lifetime_ms=4000