Download Debugging Linux Systems by Sreekrishnan Venkateswaran PDF

By Sreekrishnan Venkateswaran

Debugging Linux Systems discusses the most instruments to be had at the present time to debug 2.6 Linux Kernels. we begin via exploring the likely esoteric operations of the Kernel Debugger (KDB), Kernel GNU DeBugger (KGDB), the apparent GNU DeBugger (GDB), and JTAG debuggers. We then examine Kernel Probes, a function that permits you to interfere right into a kernel functionality and extract debug info or follow a medicated patch. examining a crash unload can yield clues for postmortem research of kernel crashes or hangs, so we seriously look into Kdump, a serviceability device that collects a procedure unload after spawning a brand new kernel. Profiling issues you to code areas that burn extra CPU cycles, so we discover ways to use the OProfile kernel profiler and the gprof software profiler to experience the presence of code bottlenecks. simply because tracing offers perception into behavioral difficulties that appear in the course of interactions among diverse code modules, we delve into the Linux hint Toolkit, a approach designed for high-volume hint capture.

 

The part “Debugging Embedded Linux” takes a journey of the I/O interfaces regularly came across on embedded undefined, reminiscent of flash reminiscence, serial port, PCMCIA, safe electronic media, USB, RTC, audio, video, contact display, and Bluetooth, and offers tips that could debug the linked machine drivers. We additionally decide up a few board-level debugging abilities with assistance from a case examine. The part “Debugging community Throughput” takes you thru a few gadget driving force layout matters and protocol implementation features which may impact the horsepower of your community interface card. We finish the shortcut by means of studying numerous thoughts to be had within the kernel configuration menu which may emit priceless debug information.

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6 You have to enable CONFIG_KALLSYMS during kernel configuration to obtain the services of this function. 32 Debugging Linux Systems (Digital Shortcut) � 2010 Pearson Education. All rights reserved. by Sreekrishnan Venkateswaran This publication is protected by copyright. Please see page 2 for more details. Com SECTION #2 Kernel Probes for (i=0; i < npages; i++, curr_pfn++) { /* ... */ } } /* ... */ } /* ... */ } Whenever npages is assigned a value greater than 10, the kprobed patch pulls it back to 10, thus stepping around the problem.

4 Debugging Conventions Used . . . . . . . . . . . . . 4 Dedication . . . . . . . . . . . . . . . . . . 5 Linux Systems Kernel Debuggers . . . . . . . . . . . . . 6 Kernel Probes . . . . . . . . . . . . . . . 25 ptg5994185 Kexec and Kdump . . . . . . . . . . . . 41 Sreekrishnan Venkateswaran Profiling. . . . . . . . . . . . . . . . . . . 54 Tracing. . . . . . . . . . . . . . . . .

5 implements this kretprobe. 37 Debugging Linux Systems (Digital Shortcut) � 2010 Pearson Education. All rights reserved. by Sreekrishnan Venkateswaran This publication is protected by copyright. Please see page 2 for more details. h> /* kretprobe at exit from tty_open() */ static int kret_tty_open(struct kretprobe_instance *kreti, struct pt_regs *regs) { ptg5994185 /* The EAX register contains the function return value on x86 systems */ if ((int) regs->eax) { /* tty_open() failed. handler = (kretprobe_handler_t)kret_tty_open }; int init_module(void) 38 Debugging Linux Systems (Digital Shortcut) � 2010 Pearson Education.

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