January 2004
Intermediate to advanced
432 pages
11h 1m
English
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q4
q4 is a tool that was designed for analyzing kernel core dumps. However, like adb, it can also be used on a running system. You do need to be aware that most kernel data structures are very dynamic, changing constantly. Thus, if you're looking at a live kernel rather than a dump, you need to realize that the data you're looking at is a snapshot.
Like adb, q4 takes a kernel file and a memory image or core dump directory as parameters. If the parameters are omitted, it looks for vmunix and a core dump in the current directory. So, if you're looking at a core dump, change to the directory that has the dump in it and just type q4. If you want to run q4 on the running kernel, type q4 /stand/vmunix /dev/mem.
A very useful option to q4 is –p, which ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.