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Unpacking gz linux kernel sources11/28/2023 Thus, the following command sequence will create a + patched kernel source tree from which an identical kernel can be + rebuilt (assumes that IKPATCHSET_PROC is also configured): + tar zxf /proc/ baseversion + major=`cut -d. The vanilla kernel version on which the + patchset is based is available in the file "baseversion" of the + archive. It is also + possible to extract the patchset from a running kernel via + /proc/. The patchset can be extracted from a kernel image + file using the script scripts/extract-ikpatchset. +config IKPATCHSET + tristate "Kernel patchset support" + depends on PROC_FS + select IKCONFIG + select BUILD_BIN2C + help + This option enables the complete patchset, if any, to be saved + in the kernel. This option enables access to the kernel configuration file Is much better than making available nothing. Tar zxf /proc/ baseversionīTW: Making the kernel sources available through this mechanism does notĮntirely fulfill the disclosure obligations of the GPL, but it certainly Reproduce the source tree that was used for a particular kernel, use the This patch now provides a mechanism to store the current patchset in theīinary kernel in a very similar way as it is done with the config file. (If a patchset cannot be obtained with reasonableĮffort, the board vendor, of course, is in breach of the Linux kernel Large patchset that often is difficult to obtain, the saved config file In modern times, however, when myriads of (mostly ARM based) computerīoards are inundating the market every year most of which require a This made it possible to reproduce a kernel from Them, it was an excellent idea to save the current kernel configuration Released per year and mainline kernel support was available for most of In the good old days when only a small number of computer boards were As long as you are not intimated by the kernel sources, rebuilding the tools is actually quite a straightforward process.Subject: Save the current patchset in the kernel Getting all the features requires some work. Getting perf for your favorite distribution is easy. Running make again should show you all the features enabled Summary Install everything in a single command sudo apt install libdwarf-dev libdw-dev binutils-dev libcap-dev libelf-dev libnuma-dev libperf-dev python2 python2-dev python-setuptools libssl-dev libunwind-dev libdwarf-dev libunwindw zlib1g-dev liblzma-dev libaio-dev I'll go through one-by-one the features and required library to enable the support Feature This is because our minimal environment does not provide most of the libraries required for these features. Notice how we are missing a lot of things. The build configuration will print out the supported features. Now, you can simply run make to build perf make If you have not yet installed basic tools for building C applications, then run the following minimal setup to get the tools to build perf sudo apt install make gcc flex bison Move to the perf tool base directory cd linux-6.0.9/tools/perf Compile perf The next task is to fetch and extract the sources.įetch the sources curl -o Įxtract the sources tar xvf I opted in using the latest kernel version 6.0.9. Extract the source package and see what is required If you are only after the latest features, then go with the latest version. The safest way is to match the version number to the kernel version of the system under test. Unsurprisingly, it is very well-maintained and does not require any fancy tools to build. It is distributed with the kernel so you can get it from. The sourceįirst, we need to get the source code for perf. Luckily, compiling perf from the sources is fairly straightforward.Īll of the examples are run within Ubuntu 22.04 ( ubuntu:22.04) docker image. The only way was to recompile perf from the source. For instance, I needed to use a Python script to analyze the function execution times on a system that did not provide perf with Python support. Sometimes you need it with all the bells and whistles on. It comes with basic features enabled, which are perfectly suitable for most scenarios. You can find it easily in the repositories. The perf profile is included in most Linux distributions. 3 min read Photo by Todd Quackenbush / Unsplash.
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