user/sven/linux.git/include/linux/sched.h, branch v4.1.6

x86: pvclock: Really remove the sched notifier for cross-cpu migrations

2015-04-27T13:49:30Z

This reverts commits 0a4e6be9ca17c54817cf814b4b5aa60478c6df27 and 80f7fdb1c7f0f9266421f823964fd1962681f6ce. The task migration notifier was originally introduced in order to support the pvclock vsyscall with non-synchronized TSC, but KVM only supports it with synchronized TSC. Hence, on KVM the race condition is only needed due to a bad implementation on the host side, and even then it's so rare that it's mostly theoretical. As far as KVM is concerned it's possible to fix the host, avoiding the additional complexity in the vDSO and the (re)introduction of the task migration notifier. Xen, on the other hand, hasn't yet implemented vsyscall support at all, so we do not care about its plans for non-synchronized TSC. Reported-by: Peter Zijlstra Suggested-by: Marcelo Tosatti Signed-off-by: Paolo Bonzini

Merge branch 'exec_domain_rip_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc

2015-04-15T20:53:55Z

Pull exec domain removal from Richard Weinberger: "This series removes execution domain support from Linux. The idea behind exec domains was to support different ABIs. The feature was never complete nor stable. Let's rip it out and make the kernel signal handling code less complicated" * 'exec_domain_rip_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc: (27 commits) arm64: Removed unused variable sparc: Fix execution domain removal Remove rest of exec domains. arch: Remove exec_domain from remaining archs arc: Remove signal translation and exec_domain xtensa: Remove signal translation and exec_domain xtensa: Autogenerate offsets in struct thread_info x86: Remove signal translation and exec_domain unicore32: Remove signal translation and exec_domain um: Remove signal translation and exec_domain tile: Remove signal translation and exec_domain sparc: Remove signal translation and exec_domain sh: Remove signal translation and exec_domain s390: Remove signal translation and exec_domain mn10300: Remove signal translation and exec_domain microblaze: Remove signal translation and exec_domain m68k: Remove signal translation and exec_domain m32r: Remove signal translation and exec_domain m32r: Autogenerate offsets in struct thread_info frv: Remove signal translation and exec_domain ...

Merge branch 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2015-04-13T23:47:11Z

Pull cgroup updates from Tejun Heo: "Nothing too interesting. Rik made cpuset cooperate better with isolcpus and there are several other cleanup patches" * 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cpuset, isolcpus: document relationship between cpusets & isolcpus cpusets, isolcpus: exclude isolcpus from load balancing in cpusets sched, isolcpu: make cpu_isolated_map visible outside scheduler cpuset: initialize cpuset a bit early cgroup: Use kvfree in pidlist_free() cgroup: call cgroup_subsys->bind on cgroup subsys initialization

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-04-13T17:47:34Z

Pull scheduler changes from Ingo Molnar: "Major changes: - Reworked CPU capacity code, for better SMP load balancing on systems with assymetric CPUs. (Vincent Guittot, Morten Rasmussen) - Reworked RT task SMP balancing to be push based instead of pull based, to reduce latencies on large CPU count systems. (Steven Rostedt) - SCHED_DEADLINE support updates and fixes. (Juri Lelli) - SCHED_DEADLINE task migration support during CPU hotplug. (Wanpeng Li) - x86 mwait-idle optimizations and fixes. (Mike Galbraith, Len Brown) - sched/numa improvements. (Rik van Riel) - various cleanups" * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (28 commits) sched/core: Drop debugging leftover trace_printk call sched/deadline: Support DL task migration during CPU hotplug sched/core: Check for available DL bandwidth in cpuset_cpu_inactive() sched/deadline: Always enqueue on previous rq when dl_task_timer() fires sched/core: Remove unused argument from init_[rt|dl]_rq() sched/deadline: Fix rt runtime corruption when dl fails its global constraints sched/deadline: Avoid a superfluous check sched: Improve load balancing in the presence of idle CPUs sched: Optimize freq invariant accounting sched: Move CFS tasks to CPUs with higher capacity sched: Add SD_PREFER_SIBLING for SMT level sched: Remove unused struct sched_group_capacity::capacity_orig sched: Replace capacity_factor by usage sched: Calculate CPU's usage statistic and put it into struct sg_lb_stats::group_usage sched: Add struct rq::cpu_capacity_orig sched: Make scale_rt invariant with frequency sched: Make sched entity usage tracking scale-invariant sched: Remove frequency scaling from cpu_capacity sched: Track group sched_entity usage contributions sched: Add sched_avg::utilization_avg_contrib ...

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2015-04-13T16:47:01Z

Pull KVM updates from Paolo Bonzini: "First batch of KVM changes for 4.1 The most interesting bit here is irqfd/ioeventfd support for ARM and ARM64. Summary: ARM/ARM64: fixes for live migration, irqfd and ioeventfd support (enabling vhost, too), page aging s390: interrupt handling rework, allowing to inject all local interrupts via new ioctl and to get/set the full local irq state for migration and introspection. New ioctls to access memory by virtual address, and to get/set the guest storage keys. SIMD support. MIPS: FPU and MIPS SIMD Architecture (MSA) support. Includes some patches from Ralf Baechle's MIPS tree. x86: bugfixes (notably for pvclock, the others are small) and cleanups. Another small latency improvement for the TSC deadline timer" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (146 commits) KVM: use slowpath for cross page cached accesses kvm: mmu: lazy collapse small sptes into large sptes KVM: x86: Clear CR2 on VCPU reset KVM: x86: DR0-DR3 are not clear on reset KVM: x86: BSP in MSR_IA32_APICBASE is writable KVM: x86: simplify kvm_apic_map KVM: x86: avoid logical_map when it is invalid KVM: x86: fix mixed APIC mode broadcast KVM: x86: use MDA for interrupt matching kvm/ppc/mpic: drop unused IRQ_testbit KVM: nVMX: remove unnecessary double caching of MAXPHYADDR KVM: nVMX: checks for address bits beyond MAXPHYADDR on VM-entry KVM: x86: cache maxphyaddr CPUID leaf in struct kvm_vcpu KVM: vmx: pass error code with internal error #2 x86: vdso: fix pvclock races with task migration KVM: remove kvm_read_hva and kvm_read_hva_atomic KVM: x86: optimize delivery of TSC deadline timer interrupt KVM: x86: extract blocking logic from __vcpu_run kvm: x86: fix x86 eflags fixed bit KVM: s390: migrate vcpu interrupt state ...

Remove rest of exec domains.

2015-04-12T19:03:31Z

It is gone from all archs, now we can remove the final bits. Signed-off-by: Richard Weinberger

sched: Add sched_avg::utilization_avg_contrib

2015-03-27T08:35:57Z

Add new statistics which reflect the average time a task is running on the CPU and the sum of these running time of the tasks on a runqueue. The latter is named utilization_load_avg. This patch is based on the usage metric that was proposed in the 1st versions of the per-entity load tracking patchset by Paul Turner but that has be removed afterwards. This version differs from the original one in the sense that it's not linked to task_group. The rq's utilization_load_avg will be used to check if a rq is overloaded or not instead of trying to compute how many tasks a group of CPUs can handle. Rename runnable_avg_period into avg_period as it is now used with both runnable_avg_sum and running_avg_sum. Add some descriptions of the variables to explain their differences. Signed-off-by: Vincent Guittot Signed-off-by: Peter Zijlstra (Intel) Acked-by: Morten Rasmussen Cc: Paul Turner Cc: Ben Segall Cc: Ben Segall Cc: Morten.Rasmussen@arm.com Cc: Paul Turner Cc: dietmar.eggemann@arm.com Cc: efault@gmx.de Cc: kamalesh@linux.vnet.ibm.com Cc: linaro-kernel@lists.linaro.org Cc: nicolas.pitre@linaro.org Cc: preeti@linux.vnet.ibm.com Cc: riel@redhat.com Link: http://lkml.kernel.org/r/1425052454-25797-2-git-send-email-vincent.guittot@linaro.org Signed-off-by: Ingo Molnar

mm: numa: slow PTE scan rate if migration failures occur

2015-03-25T23:20:31Z

Dave Chinner reported the following on https://lkml.org/lkml/2015/3/1/226 Across the board the 4.0-rc1 numbers are much slower, and the degradation is far worse when using the large memory footprint configs. Perf points straight at the cause - this is from 4.0-rc1 on the "-o bhash=101073" config: - 56.07% 56.07% [kernel] [k] default_send_IPI_mask_sequence_phys - default_send_IPI_mask_sequence_phys - 99.99% physflat_send_IPI_mask - 99.37% native_send_call_func_ipi smp_call_function_many - native_flush_tlb_others - 99.85% flush_tlb_page ptep_clear_flush try_to_unmap_one rmap_walk try_to_unmap migrate_pages migrate_misplaced_page - handle_mm_fault - 99.73% __do_page_fault trace_do_page_fault do_async_page_fault + async_page_fault 0.63% native_send_call_func_single_ipi generic_exec_single smp_call_function_single This is showing excessive migration activity even though excessive migrations are meant to get throttled. Normally, the scan rate is tuned on a per-task basis depending on the locality of faults. However, if migrations fail for any reason then the PTE scanner may scan faster if the faults continue to be remote. This means there is higher system CPU overhead and fault trapping at exactly the time we know that migrations cannot happen. This patch tracks when migration failures occur and slows the PTE scanner. Signed-off-by: Mel Gorman Reported-by: Dave Chinner Tested-by: Dave Chinner Cc: Ingo Molnar Cc: Aneesh Kumar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

x86: kvm: Revert "remove sched notifier for cross-cpu migrations"

2015-03-23T23:22:48Z

The following point: 2. per-CPU pvclock time info is updated if the underlying CPU changes. Is not true anymore since "KVM: x86: update pvclock area conditionally, on cpu migration". Add task migration notification back. Problem noticed by Andy Lutomirski. Signed-off-by: Marcelo Tosatti CC: stable@kernel.org # 3.11+

sched, isolcpu: make cpu_isolated_map visible outside scheduler

2015-03-19T18:28:19Z

Needed by the next patch. Also makes cpu_isolated_map present when compiled without SMP and/or with CONFIG_NR_CPUS=1, like the other cpu masks. At some point we may want to clean things up so cpumasks do not exist in UP kernels. Maybe something for the CONFIG_TINY crowd. Cc: Peter Zijlstra Cc: Clark Williams Cc: Li Zefan Cc: Ingo Molnar Cc: Luiz Capitulino Cc: David Rientjes Cc: Mike Galbraith Cc: cgroups@vger.kernel.org Signed-off-by: Rik van Riel Acked-by: Zefan Li Signed-off-by: Tejun Heo