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How to interpret some kernel OOPS output?

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I'm trying to analyze some kernel OOPS message. I'm able to understand most of the output, but there's still some lines that I have no idea how the should be interpreted.

The first thing is PGD which is the page global directory, but in the kernel OOPS output I just got 0. What does it mean?

PGD 0 

The next are the numbers in the following line:

ops: 0000 [#1] SMP 

The last thing concerns a process, at least I think so. Check the following lines:

kernel: [67881.994448] CPU: 0 PID: 129320 Comm: Xorg Tainted: G           O    4.3.0-1-amd64 #1 Debian 4.3.5-1 kernel: [67881.994536] task: ffff8800766e8c80 ti: ffff8800735f0000 task.ti: ffff8800735f0000 

So, what do task, ti and task.ti mean? Are they related to the PID above somehow?

Tags:kernel

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