topic Re: bubbleup / bubbledown in stack traces? in Operating System - HP-UX

bubbleup / bubbledown in stack traces?

Robert_Jewell — Thu, 07 Sep 2006 11:10:11 GMT

Good day all;
I have noticed that within HP-UX 11.23 whenever there is a panic there seems to be reference to a bubbledown or bubbleup proc in just about each stack. I have not been able to find any reference to this. It is more of a curiosity at this point for me. Could anyone provide any enlightenment on these terms?

Below is an example:

panic_save_regs_switchstack+0x110
panic+0x310
unaligned_hndlr+0x120
bubbledown+0x0 <--????
nfs3readdirplus+0x630
do_nfs3readdir+0xd0
nfs_async_readdir+0x270
nfs3_readdir2+0x960
getdents+0x240
syscall+0x940

Thank you,
-Bob

Re: bubbleup / bubbledown in stack traces?

Sameer_Nirmal — Thu, 07 Sep 2006 18:55:08 GMT

I only know little bit.

bubbleup points/related to child process.
bubbledown points/related to parent process.

I am not sure about the hex number against them. Maybe related to PID?

Re: bubbleup / bubbledown in stack traces?

Carsten Krege — Fri, 08 Sep 2006 02:52:38 GMT

bubbleup is a kernel function to perform the transition from the low level to the high level interrupt handler.

bubbledown goes down from the high level interrupt handler back to the interrupted code.

Basically these functions need to save/restore the state before/after handling an interrupt.

Carsten

Re: bubbleup / bubbledown in stack traces?

Robert_Jewell — Fri, 08 Sep 2006 08:12:21 GMT

Great info. Thank you.

-Bob

Re: bubbleup / bubbledown in stack traces?

Robert_Jewell — Fri, 08 Sep 2006 08:13:02 GMT

Thanks again.