This is the latest version of my CPU isolation tree. Git tree is available at: git://git.kernel.org/pub/scm/linux/kernel/git/maxk/cpuisol-2.6.25.y.git http://www.kernel.org/pub/scm/linux/kernel/git/maxk/cpuisol-2.6.25.y.git Full patch is at: http://kernel.org/pub/linux/kernel/people/maxk/cpuisol/patches/v2.6.25.6.cpuisol1.patch In order to simplify overall system setup I wrote a simple tool for system partitioning - "syspart". You can get the latest version from here http://kernel.org/pub/linux/kernel/people/maxk/cpuisol/syspart/ git://git.kernel.org/pub/scm/linux/kernel/git/maxk/syspart.git This tool takes care of setting up IRQ affinities and cpusets, moving kernel and user space tasks, bring CPUs off/online, etc. Please note that you want to disable daemons like "irqbalance" to avoid resource partitioning conflicts. For more info see syspart/README. -- I also have some sample kernel configs that have been tested and are know to work. You can pick one of them as base for your kernel: http://kernel.org/pub/linux/kernel/people/maxk/cpuisol/configs/ Required kernel features: CONFIG_CGROUP CONFIG_CPUSETS CONFIG_CPU_HOTPLUG Following features are required if you intend on chewing ~100% in the user space SCHED_FIFO threads running on the isolated CPUs (note that OPROFILE is known to not work for this use case): CONFIG_SLUB or CONFIG_SLOB You may also want to disable the following features in order to achieve the lowest possible latency: !CONFIG_HIGH_RES_TIMERS !CONFIG_NO_HZ !CONFIG_CPU_FREQ And of course you want to refer to http://rt.wiki.kernel.org/index.php/HOWTO:_Build_an_RT-application for general guidelines on how to build RT applications. --- This version is based on a completely different approach (compared to previous cpuisol tree releases). Instead of the centralized cpu_isolation_map it's now based on the existing kernel features like cpusets. The number of changes is therefor very small. Shortlog: Max Krasnyansky (6): sched: Fix memory leak in the cpu hotplug handing logic sched: CPU hotplug events must not destroy scheduler domains created by the cpusets genirq: Expose default irq affinity mask (take 3) sysctl: Add generic cpumask parser for sysctls stopmachine: Introduce stopmachine_cpus sysctl Linux 2.6.25.6.cpuisol1 sched: changes are simple bug fixes and are on their way into the mainline. genirq: stuff has been ACKed in general is pending final ACK from genirq maintainer. stopmachine change is a temporary hack to allow for module insertion and removal. Diffstat: Documentation/IRQ-affinity.txt | 37 ++++++++++++++---- Documentation/filesystems/proc.txt | 29 +++++++++----- Makefile | 2 - arch/alpha/kernel/irq.c | 5 +- include/linux/irq.h | 14 ++----- include/linux/sysctl.h | 2 + kernel/cpuset.c | 6 +++ kernel/irq/manage.c | 28 +++++++++++++- kernel/irq/proc.c | 59 +++++++++++++++++++++++++++-- kernel/sched.c | 23 +++++++++++ kernel/stop_machine.c | 5 ++ kernel/sysctl.c | 73 +++++++++++++++++++++++++++++++++++ 12 files changed, 244 insertions(+), 39 deletions(-) Comments, questions, suggestions and bug reports are welcome. Max -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
