绕过softlockup_threshold

Question

I develop a kernel module which does a heavy job which of course takes time. The problem is that the module utilizes the CPU for more than 20 seconds and as a result a BUG of softlockup_threshold is raised.

My question is, is there any way to bypass this? ie can it tamper the threshold? Or can it force scheduling and continue its work later? (in order to set the timer to 0).

Thank you in advance, Panos

Answer 1

With new kernels, you can tune /proc/sys/kernel/watchdog_thresh (Older kernels use /proc/sys/kernel/softlockup_thresh, I think). But this is not encouraged, because blocking for 20 seconds means there is some problem with you code, you should yield the CPU, eg by calling cond_resched().

Answer 2

您可以尝试让CPU产生一段时间，如果可以接受，那么您应该研究一下schedule()这里有一篇很棒的文章，关于内核中的睡眠