Debugging Linux Kernel using ftrace Part7 - Script to find out what all kernel functions are executed by a particular command

-
I wrote a script to find out what all kernel functions are being called for a particular linux command we execute.

Script:
#!/bin/bash
# Mount the tracefs
mount -t tracefs nodev /sys/kernel/tracing
# Disable tracing
echo "0" > /sys/kernel/tracing/tracing_on
# set the current tracer to nop
echo "nop" > /sys/kernel/tracing/current_tracer
# clear the existing trace
echo > /sys/kernel/tracing/trace
# set the current tracer to function_graph
echo "function_graph" > /sys/kernel/tracing/current_tracer
# Enable tracing
echo "1" > /sys/kernel/tracing/tracing_on
# Execute the command
sh -c 'echo $$ > /sys/kernel/tracing/set_ftrace_pid;echo "1" > /sys/kernel/tracing/tracing_on;exec 'acpi -V';echo "0" > /sys/kernel/tracing/tracing_on'
# Cat the trace file into temporary file
cat /sys/kernel/tracing/trace > /tmp/mycommand_trace
view raw kernelfunctions.sh hosted with ❤ by GitHub

Output: 

Comments

Post a Comment

Popular posts from this blog

bb.utils.contains yocto

-
Image
bb.utils.contains  is most commonly used function in Yocto. grep in poky directory returned with 696 count. $ grep -nr 'bb.utils.contains' poky/ | wc -l 696 It's definition is present in 'poky/bitbake/lib/bb/utils.py' file This function returns third argument if the second argument is subset of the first argument else returns fourth argument Let's take an example to understand this. You can see from the above screenshot, when the second argument is a subset of first argument, "present" was returned, else "notpresent" was returned We can also use bb.utils.contains inside if loop. This we can use inside a recipe. if ${@bb.utils.contains('SOMEFLAG','NEWVALUE3','true','false',d)}; then     FOO = 'HELLO' fi
Read more

Difference between RDEPENDS and DEPENDS in Yocto

-
We normally observe these two (RDEPENDS and DEPENDS) whenever we open any recipe. What should we choose when we write our own recipe. DEPENDS -> Build Time Dependency RDEPENDS -> Run Time Dependency DEPENDS: When a recipe 'A' is DEPENDS on recipe 'B'. In this case, Bitbake first builds recipe 'B' and then recipe 'A' E.g. You need 'dbus' to be built before 'wpa_supplicant'. RDEPENDS: When a recipe 'A' is RDEPENDS on recipe 'B'. In this case, Bitbake deploys 'B' on the target system when it deploys 'A'.  E.g. 'perf' RDEPENDS on 'bash' In other words, DEPENDS are those set of packages that should be available while building package, whereas RDEPENDS are set of packages that should be available during execution of the program.
Read more

PR, PN and PV Variable in Yocto

-
PN : Represents the name of the recipe. The name is usually extracted from the recipe file name. PR:  Represents the revision of the recipe. Default value for this revision is "r0". Subsequent revisions of the recipe conventionally will have "r1", "r2" and so on. PV:  Represents the version of the recipe. Normally extracted from the recipe file name. For example: ffmpeg_3.4.2.bb recipe. ${PN} : ffmpeg ${PV} : 3.4.2
Read more