Re: Generate the config file for kernel compilation non-interactively in script.
On Fri, Jan 1, 2021 at 2:32 PM Randy Dunlap wrote: > > On 12/31/20 8:51 PM, Hongyi Zhao wrote: > > Hi, > > > > I want to build the realtime Linux for ROS 2 according to the > > guidelines here: > > <https://index.ros.org/doc/ros2/Tutorials/Building-Realtime-rt_preempt-kernel-for-ROS-2/>. > > > > For this purpose, I must enable the rt_preempt relative options in the > > kernel withe the following method interactively: > > > > $ make menuconfig > > > > and set the following > > > > # Enable CONFIG_PREEMPT_RT > > -> General Setup > > -> Preemption Model (Fully Preemptible Kernel (Real-Time)) > >(X) Fully Preemptible Kernel (Real-Time) > > > > # Enable CONFIG_HIGH_RES_TIMERS > > -> General setup > > -> Timers subsystem > >[*] High Resolution Timer Support > > > > # Enable CONFIG_NO_HZ_FULL > > -> General setup > > -> Timers subsystem > >-> Timer tick handling (Full dynticks system (tickless)) > > (X) Full dynticks system (tickless) > > > > # Set CONFIG_HZ_1000 (note: this is no longer in the General Setup > > menu, go back twice) > > -> Processor type and features > > -> Timer frequency (1000 HZ) > >(X) 1000 HZ > > > > # Set CPU_FREQ_DEFAULT_GOV_PERFORMANCE [=y] > > -> Power management and ACPI options > > -> CPU Frequency scaling > >-> CPU Frequency scaling (CPU_FREQ [=y]) > > -> Default CPUFreq governor ( [=y]) > > (X) performance > > > > But this is very inconvenient for doing the above job in script. Is > > there an alternative method to generate the above configurations for > > kernel compilation non-interactively in script. > > Hi, > You can use scripts/config in the kernel source tree. > Something like this (I don't have RT kernel sources): > > > scripts/config -e PREEMPT_RT > scripts/config -e HIGH_RES_TIMERS > scripts/config -e NO_HZ_FULL > scripts/config -e HZ_1000 > scripts/config -e CPU_FREQ_DEFAULT_GOV_PERFORMANCE Based on the built-in help of this script: $ bash scripts/config -h |& egrep -- '-e |--file|commands' commands: --enable|-e option Enable option commands can be repeated multiple times --file config-file .config file to change (default .config) It's obviously that the above commands you suggested can be combined into one as shown below: $ scripts/config --file .config -e PREEMPT_RT -e HIGH_RES_TIMERS -e NO_HZ_FULL -e HZ_1000 -e CPU_FREQ_DEFAULT_GOV_PERFORMANCE or simply: $ scripts/config -e PREEMPT_RT -e HIGH_RES_TIMERS -e NO_HZ_FULL -e HZ_1000 -e CPU_FREQ_DEFAULT_GOV_PERFORMANCE BR, > > > Note that if any of those have other Kconfig dependencies, those Kconfig > symbols will also have to be enabled for this to work. > > And then run 'make oldconfig' to update the kernel .config file. > > > HTH. > -- > ~Randy > -- Assoc. Prof. Hongyi Zhao Theory and Simulation of Materials Hebei Polytechnic University of Science and Technology engineering NO. 552 North Gangtie Road, Xingtai, China
Re: Generate the config file for kernel compilation non-interactively in script.
On Sat, Jan 2, 2021 at 12:28 AM Randy Dunlap wrote: > > Hi, > > On 1/1/21 1:55 AM, Hongyi Zhao wrote: > > On Fri, Jan 1, 2021 at 2:32 PM Randy Dunlap wrote: > >> > >> On 12/31/20 8:51 PM, Hongyi Zhao wrote: > >>> Hi, > >>> > >>> I want to build the realtime Linux for ROS 2 according to the > >>> guidelines here: > >>> <https://index.ros.org/doc/ros2/Tutorials/Building-Realtime-rt_preempt-kernel-for-ROS-2/>. > >>> > >>> For this purpose, I must enable the rt_preempt relative options in the > >>> kernel withe the following method interactively: > >>> > >>> $ make menuconfig > >>> > >>> and set the following > >>> > >>> # Enable CONFIG_PREEMPT_RT > >>> -> General Setup > >>> -> Preemption Model (Fully Preemptible Kernel (Real-Time)) > >>>(X) Fully Preemptible Kernel (Real-Time) > >>> > >>> # Enable CONFIG_HIGH_RES_TIMERS > >>> -> General setup > >>> -> Timers subsystem > >>>[*] High Resolution Timer Support > >>> > >>> # Enable CONFIG_NO_HZ_FULL > >>> -> General setup > >>> -> Timers subsystem > >>>-> Timer tick handling (Full dynticks system (tickless)) > >>> (X) Full dynticks system (tickless) > >>> > >>> # Set CONFIG_HZ_1000 (note: this is no longer in the General Setup > >>> menu, go back twice) > >>> -> Processor type and features > >>> -> Timer frequency (1000 HZ) > >>>(X) 1000 HZ > >>> > >>> # Set CPU_FREQ_DEFAULT_GOV_PERFORMANCE [=y] > >>> -> Power management and ACPI options > >>> -> CPU Frequency scaling > >>>-> CPU Frequency scaling (CPU_FREQ [=y]) > >>> -> Default CPUFreq governor ( [=y]) > >>> (X) performance > >>> > >>> But this is very inconvenient for doing the above job in script. Is > >>> there an alternative method to generate the above configurations for > >>> kernel compilation non-interactively in script. > >> > >> Hi, > >> You can use scripts/config in the kernel source tree. > >> Something like this (I don't have RT kernel sources): > >> > >> > >> scripts/config -e PREEMPT_RT > >> scripts/config -e HIGH_RES_TIMERS > >> scripts/config -e NO_HZ_FULL > >> scripts/config -e HZ_1000 > >> scripts/config -e CPU_FREQ_DEFAULT_GOV_PERFORMANCE > > > > Wonderful. Thanks a lot for your instructions. I really have noticed > > this tool but failed to figure out the corresponding translation rules > > for the options used by menuconfig and this script. > > > > BTW, how do you figure out the above options/arguments corresponding > > to the ones I've mentioned previously? > > > > Oh, I just took the ones that you had listed and removed the leading > "CONFIG_" from them. > > >> > >> Note that if any of those have other Kconfig dependencies, those Kconfig > >> symbols will also have to be enabled for this to work. > > > > How to know whether an option has other Kconfig dependencies and find > > the corresponding symbols/arguments for feeding to scripts/config? > > Use one of the interactive config tools (nconfig, xconfig). > They will show you dependencies, but you may have to enable other > symbols first. > > Maybe it would be easier to do a temporary 'make allmodconfig' > to have the symbols that you are interested in be enabled, then > you can find them and look at their dependencies. It sounds still complicated for manually operation of the above mentioned procedure even by the virtue of scripts/config. The more feasible way should be done with python package/binding/library programmatically, but I'm not sure whether such stuff exists. BR, -- Assoc. Prof. Hongyi Zhao Theory and Simulation of Materials Hebei Polytechnic University of Science and Technology engineering NO. 552 North Gangtie Road, Xingtai, China
Re: Generate the config file for kernel compilation non-interactively in script.
On Fri, Jan 1, 2021 at 2:32 PM Randy Dunlap wrote: > > On 12/31/20 8:51 PM, Hongyi Zhao wrote: > > Hi, > > > > I want to build the realtime Linux for ROS 2 according to the > > guidelines here: > > <https://index.ros.org/doc/ros2/Tutorials/Building-Realtime-rt_preempt-kernel-for-ROS-2/>. > > > > For this purpose, I must enable the rt_preempt relative options in the > > kernel withe the following method interactively: > > > > $ make menuconfig > > > > and set the following > > > > # Enable CONFIG_PREEMPT_RT > > -> General Setup > > -> Preemption Model (Fully Preemptible Kernel (Real-Time)) > >(X) Fully Preemptible Kernel (Real-Time) > > > > # Enable CONFIG_HIGH_RES_TIMERS > > -> General setup > > -> Timers subsystem > >[*] High Resolution Timer Support > > > > # Enable CONFIG_NO_HZ_FULL > > -> General setup > > -> Timers subsystem > >-> Timer tick handling (Full dynticks system (tickless)) > > (X) Full dynticks system (tickless) > > > > # Set CONFIG_HZ_1000 (note: this is no longer in the General Setup > > menu, go back twice) > > -> Processor type and features > > -> Timer frequency (1000 HZ) > >(X) 1000 HZ > > > > # Set CPU_FREQ_DEFAULT_GOV_PERFORMANCE [=y] > > -> Power management and ACPI options > > -> CPU Frequency scaling > >-> CPU Frequency scaling (CPU_FREQ [=y]) > > -> Default CPUFreq governor ( [=y]) > > (X) performance > > > > But this is very inconvenient for doing the above job in script. Is > > there an alternative method to generate the above configurations for > > kernel compilation non-interactively in script. > > Hi, > You can use scripts/config in the kernel source tree. > Something like this (I don't have RT kernel sources): > > > scripts/config -e PREEMPT_RT > scripts/config -e HIGH_RES_TIMERS > scripts/config -e NO_HZ_FULL > scripts/config -e HZ_1000 > scripts/config -e CPU_FREQ_DEFAULT_GOV_PERFORMANCE Wonderful. Thanks a lot for your instructions. I really have noticed this tool but failed to figure out the corresponding translation rules for the options used by menuconfig and this script. BTW, how do you figure out the above options/arguments corresponding to the ones I've mentioned previously? > > Note that if any of those have other Kconfig dependencies, those Kconfig > symbols will also have to be enabled for this to work. How to know whether an option has other Kconfig dependencies and find the corresponding symbols/arguments for feeding to scripts/config? > And then run 'make oldconfig' to update the kernel .config file. Thanks again. BR, -- Assoc. Prof. Hongyi Zhao Theory and Simulation of Materials Hebei Polytechnic University of Science and Technology engineering NO. 552 North Gangtie Road, Xingtai, China
Generate the config file for kernel compilation non-interactively in script.
Hi, I want to build the realtime Linux for ROS 2 according to the guidelines here: <https://index.ros.org/doc/ros2/Tutorials/Building-Realtime-rt_preempt-kernel-for-ROS-2/>. For this purpose, I must enable the rt_preempt relative options in the kernel withe the following method interactively: $ make menuconfig and set the following # Enable CONFIG_PREEMPT_RT -> General Setup -> Preemption Model (Fully Preemptible Kernel (Real-Time)) (X) Fully Preemptible Kernel (Real-Time) # Enable CONFIG_HIGH_RES_TIMERS -> General setup -> Timers subsystem [*] High Resolution Timer Support # Enable CONFIG_NO_HZ_FULL -> General setup -> Timers subsystem -> Timer tick handling (Full dynticks system (tickless)) (X) Full dynticks system (tickless) # Set CONFIG_HZ_1000 (note: this is no longer in the General Setup menu, go back twice) -> Processor type and features -> Timer frequency (1000 HZ) (X) 1000 HZ # Set CPU_FREQ_DEFAULT_GOV_PERFORMANCE [=y] -> Power management and ACPI options -> CPU Frequency scaling -> CPU Frequency scaling (CPU_FREQ [=y]) -> Default CPUFreq governor ( [=y]) (X) performance But this is very inconvenient for doing the above job in script. Is there an alternative method to generate the above configurations for kernel compilation non-interactively in script. BR, -- Assoc. Prof. Hongyi Zhao Theory and Simulation of Materials Hebei Polytechnic University of Science and Technology engineering NO. 552 North Gangtie Road, Xingtai, China
Has the linux-kernel already implemented the functions in apollo-kernel?
Hi, The apollo-kernel (https://github.com/ApolloAuto/apollo-kernel) is a patched Linux Kernel based on official Linux Kernel 4.4.32 with some modifications on the kernel level, especially for the scenario necessary to run the Apollo (https://github.com/ApolloAuto/apollo) open autonomous driving platform software stack. According to the official description as shown <https://github.com/ApolloAuto/apollo-kernel#what-is-the-difference>, the major difference from the original Linux kernel is as follows: - Realtime patch (https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO) - Latest e1000e intel ethernet driver - Bugfix for Nvidia driver under realtime patch - Double free in the inet_csk_clone_lock function patch (https://bugzilla.redhat.com/show_bug.cgi?id=1450972) - Other cve security patches However, considering that Linux Kernel 4.4.32 is a fairly old version, so I want to know whether the modifications/fixes applied/added have been already available in the current Linux kernel. Any hints will be highly appreciated. Regards, -- Assoc. Prof. Hongyi Zhao Theory and Simulation of Materials, Xingtai Polytechnic College NO. 552 North Gangtie Road, Xingtai, China
