This patch adds a new cgroup subsystem to support the new Cache Allocation Technology (CAT) feature found in future Intel Xeon processors.
Cache Allocation Technology(CAT) provides a way for the Software (OS/VMM) to restrict cache allocation to a defined 'subset' of cache which may be overlapping with other 'subsets'. This feature is used when allocating a line in cache ie when pulling new data into the cache. This patch series is dependent on the patches for Intel Cache QOS Monitoring from Matt since the series also implements a common software cache for the IA32_PQR_MSR : https://lkml.kernel.org/r/[email protected] Changes in V3: - Implements a common software cache for IA32_PQR_MSR - Implements support for hsw CAT enumeration. This does not use the brand strings like earlier version but does a probe test. The probe test is done only on hsw family of processors - Made a few coding convention, name changes and minor fixes Changes in V2: - Removed HSW specific enumeration changes. Plan to include it later as a seperate patch. - Fixed the code in prep_arch_switch to be specific for x86 and removed x86 defines. - Fixed cbm_write to not write all 1s when a cgroup is freed. - Fixed one possible memory leak in init. - Changed some of manual bitmap manipulation to use the predefined bitmap APIs to make code more readable - Changed name in sources from cqe to cat - Global cat enable flag changed to static_key and disabled cgroup early_init Vikas Shivappa (6): x86/intel_cat: Intel Cache Allocation Technology detection x86/intel_cat: Adds support for Class of service management x86/intel_cat: Support cache bit mask for Intel CAT x86/intel_cat: Implement scheduling support for Intel CAT x86/intel_rdt: Software Cache for IA32_PQR_MSR x86/intel_cat: Intel haswell CAT enumeration arch/x86/include/asm/cpufeature.h | 6 +- arch/x86/include/asm/intel_cat.h | 99 ++++++++ arch/x86/include/asm/processor.h | 3 + arch/x86/include/asm/rdt.h | 13 + arch/x86/include/asm/switch_to.h | 3 + arch/x86/kernel/cpu/Makefile | 1 + arch/x86/kernel/cpu/common.c | 16 ++ arch/x86/kernel/cpu/intel_cat.c | 367 +++++++++++++++++++++++++++++ arch/x86/kernel/cpu/perf_event_intel_cqm.c | 20 +- include/linux/cgroup_subsys.h | 4 + init/Kconfig | 11 + kernel/sched/core.c | 1 + kernel/sched/sched.h | 3 + 13 files changed, 533 insertions(+), 14 deletions(-) create mode 100644 arch/x86/include/asm/intel_cat.h create mode 100644 arch/x86/include/asm/rdt.h create mode 100644 arch/x86/kernel/cpu/intel_cat.c -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
