tuxology’s gists

tuxology / Makefile

Created May 17, 2013 21:16

Tracepoint to get integer values from mutatee + modifications for x86_64 libs

	all: dyntp.so mutator mutatee

	dyntp.so: dyntp.o
	gcc -shared -fPIC -DPIC $^ -ldl -llttng-ust -O0 -o $@

	dyntp.o: dyntp.c ust_test.h
	gcc -I. -fno-strict-aliasing -Wall -g -O0 -c $< -fPIC -DPIC -o $@

	mutator: mutator.o
	g++ $^ -L/usr/lib64/dyninst -ldyninstAPI -o $@

tuxology / Makefile

Last active December 20, 2015 07:09

Gives address of a given symbol in the binary and size of the first instruction at that symbol address. depends on libbfd and libdistorm3. Distorm64 may work too

	sym2addr:sym2addr.c
	gcc -Wall -ggdb sym2addr.c -o sym2addr -lbfd -ldistorm3

	clean:
	rm -f sym2addr

tuxology / sym2addr-dwarf.c

Created August 2, 2013 23:05

Gives address of a symbol from a binary (using libdwarf)

	/*
	* Get address from symbol (libdwarf version)
	* Based on code by : Eli Bendersky (http://eli.thegreenplace.net)
	*
	*/

	#include <stdio.h>
	#include <stdarg.h>
	#include <stdlib.h>
	#include <string.h>

tuxology / lttng-netif-filter.c

Last active January 2, 2018 18:09

LTTng netif_receive_skb eBPF filter

	/*
	* addons/lttng-netif-filter.c
	*
	* A filtered version of netif_receive_skb
	*
	* Copyright (C) 2014 Suchakra Sharma <[email protected]>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; only

tuxology / lttng-sched-filter.c

Created December 8, 2014 17:16

LTTng sched_switch eBPF filter

	/*
	* addons/lttng-sched-filter.c
	*
	* A filtered version of sched_switch
	*
	* Copyright (C) 2014 Suchakra Sharma <[email protected]>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; only

tuxology / bpf-llvm-setup.sh

Created July 31, 2015 16:00

	#!/bin/bash
	set -e -x
	numcpu=$(grep -c ^processor /proc/cpuinfo)

	git clone https://github.com/llvm-mirror/llvm.git
	git clone https://github.com/llvm-mirror/clang.git llvm/tools/clang
	mkdir llvm/build/
	cd llvm/build/

	cmake .. \

tuxology / bcc-setup.sh

Created July 31, 2015 16:01

	#!/bin/bash
	set -e -x

	git clone https://github.com/svinota/pyroute2.git
	(cd pyroute2; make install)

	numcpu=$(grep -c ^processor /proc/cpuinfo)

	git clone https://github.com/iovisor/bcc.git
	mkdir bcc/build/

tuxology / output.txt

Last active September 22, 2015 15:47

Ping Latency with ftrace

	<idle>-0 [000] d... 318152.015828: do_IRQ <-ret_from_intr
	<idle>-0 [000] d.h. 318152.015832: irq_handler_entry: irq=45 name=iwlwifi
	<idle>-0 [000] dNh. 318152.015837: sched_wakeup: comm=irq/45-iwlwifi pid=598 prio=49 success=1 target_cpu=000
	<idle>-0 [000] d... 318152.015846: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=irq/45-iwlwifi next_pid=598 next_prio=49
	irq/45-iwlwifi-598 [000] d.s. 318152.015894: sched_wakeup: comm=ping pid=27782 prio=120 success=1 target_cpu=002
	<idle>-0 [002] d... 318152.015943: sched_switch: prev_comm=swapper/2 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=ping next_pid=27782 next_prio=120
	ping-27782 [002] .... 318152.015952: sys_exit: NR 47 = 84
	ping-27782 [002] .... 318152.015983: sys_exit: NR 1 = 97

tuxology / epoc_setup.md

Last active December 6, 2023 16:52

Installing EPOC Emulator

Fedora

Install Wine : sudo dnf install wine
Download the Symbian OS V5 emulator from here
Extract the files under ~/.wine/dosdevices/c:/

Running the EPOC Emulator

tuxology / irqsoff-ubench1-out.txt

Created October 6, 2015 22:05

	[root@linus tracing]# cat trace
	# tracer: irqsoff
	#
	# irqsoff latency trace v1.1.5 on 4.3.0-rc3+
	# --------------------------------------------------------------------
	# latency: 9994 us, #14/14, CPU#1 \| (M:desktop VP:0, KP:0, SP:0 HP:0 #P:4)
	# -----------------
	# \| task: insmod-29922 (uid:0 nice:0 policy:0 rt_prio:0)
	# -----------------
	# => started at: do_one_initcall

Suchakra Sharma tuxology

Installing EPOC Emulator