On Fri, Nov 29, 2013 at 8:28 AM, Vipul Jain <vipulsj@xxxxxxxxx> wrote:
Hi Kernel alias,
I am a newbie and I am trying to figure out ways where in I can recover the
Linux in below two scenarios:
1. my specific process hangs.
how to recover i cannot tell you, because it is application specific (but best is to design your system to reboot completely. eg temporary stuff or files should be stored in memory - eg, tmpfs, and rebooting will be all "gone", not erased and removed securely, but logically "gone"). And how to detect that is this:
assuming one mother process is monitoring 10 child process, so inside each child process, simply just setup a PERIODIC (eg, per 5 sec) mechanism to toggle a binary variables through IPC means. It will be reset when the mother process go around checking all the variable status and, if not reset it therefore implies that the particular process might be hung. it can wait further, or continue checking other process. at the end of checking ALL the process, if everything is OK, it should feed the kernel watchdog timer. if the kernel watchdog timer is not reset, the kernel module will then reboot the system. (ie, reboot is from kernel module).
2. kernel gets hung partially or completely.
I have done some reading and seems like there is softlockup and hardlockup
mechanisms in Linux source base that I can use but not sure, if yes I have
below questions:
1. Which kernel version is minimum required for this?
2. How do I know that soft and hard lockup are enabled in my kernel?
3. How can I customize the behavior of default action that been taken?
4. Can I use these two lockup mechanism to find out if my process is hung
or not?
5. Any pointers to any docs that can help will be appreciated.
I will greatly appreciate any help here.
Regards,
Vipul.
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Peter Teoh
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