Messages in this thread | | | Date | Mon, 28 Jun 2021 08:51:28 +0200 | From | Ingo Molnar <> | Subject | [GIT PULL] scheduler changes for v5.14 |
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Linus,
Please pull the latest sched/core git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-core-2021-06-28
# HEAD: adf3c31e18b765ea24eba7b0c1efc076b8ee3d55 sched/doc: Update the CPU capacity asymmetry bits
Scheduler udpates for this cycle:
- Changes to core scheduling facilities:
- Add "Core Scheduling" via CONFIG_SCHED_CORE=y, which enables coordinated scheduling across SMT siblings. This is a much requested feature for cloud computing platforms, to allow the flexible utilization of SMT siblings, without exposing untrusted domains to information leaks & side channels, plus to ensure more deterministic computing performance on SMT systems used by heterogenous workloads.
There's new prctls to set core scheduling groups, which allows more flexible management of workloads that can share siblings.
- Fix task->state access anti-patterns that may result in missed wakeups and rename it to ->__state in the process to catch new abuses.
- Load-balancing changes:
- Tweak newidle_balance for fair-sched, to improve 'memcache'-like workloads.
- "Age" (decay) average idle time, to better track & improve workloads such as 'tbench'.
- Fix & improve energy-aware (EAS) balancing logic & metrics.
- Fix & improve the uclamp metrics.
- Fix task migration (taskset) corner case on !CONFIG_CPUSET.
- Fix RT and deadline utilization tracking across policy changes
- Introduce a "burstable" CFS controller via cgroups, which allows bursty CPU-bound workloads to borrow a bit against their future quota to improve overall latencies & batching. Can be tweaked via /sys/fs/cgroup/cpu/<X>/cpu.cfs_burst_us.
- Rework assymetric topology/capacity detection & handling.
- Scheduler statistics & tooling:
- Disable delayacct by default, but add a sysctl to enable it at runtime if tooling needs it. Use static keys and other optimizations to make it more palatable.
- Use sched_clock() in delayacct, instead of ktime_get_ns().
- Misc cleanups and fixes.
Signed-off-by: Ingo Molnar <mingo@kernel.org> Thanks,
Ingo
------------------> Alexey Dobriyan (4): sched: Make nr_running() return 32-bit value sched: Make nr_iowait() return 32-bit value sched: Make nr_iowait_cpu() return 32-bit value sched: Make multiple runqueue task counters 32-bit
Aubrey Li (1): sched: Migration changes for core scheduling
Beata Michalska (3): sched/core: Introduce SD_ASYM_CPUCAPACITY_FULL sched_domain flag sched/topology: Rework CPU capacity asymmetry detection sched/doc: Update the CPU capacity asymmetry bits
Chris Hyser (2): sched: prctl() core-scheduling interface kselftest: Add test for core sched prctl interface
Dietmar Eggemann (1): sched/fair: Return early from update_tg_cfs_load() if delta == 0
Eric Dumazet (1): sched/debug: Remove obsolete init_schedstats()
Frederic Weisbecker (1): sched: Stop PF_NO_SETAFFINITY from being inherited by various init system threads
Huaixin Chang (1): sched/fair: Introduce the burstable CFS controller
Ingo Molnar (1): sched: Fix leftover comment typos
Joel Fernandes (Google) (3): sched: Fix priority inversion of cookied task with sibling sched/fair: Snapshot the min_vruntime of CPUs on force idle Documentation: Add usecases, design and interface for core scheduling
Lukasz Luba (3): thermal/cpufreq_cooling: Update offline CPUs per-cpu thermal_pressure sched/fair: Take thermal pressure into account while estimating energy sched/cpufreq: Consider reduced CPU capacity in energy calculation
Masahiro Yamada (1): sched: Fix a stale comment in pick_next_task()
Mel Gorman (1): delayacct: Document task_delayacct sysctl
Odin Ugedal (1): sched/fair: Fix ascii art by relpacing tabs
Oleg Nesterov (1): sched/core: Remove the pointless BUG_ON(!task) from wake_up_q()
Paul Gortmaker (1): sched/isolation: Reconcile rcu_nocbs= and nohz_full=
Peter Zijlstra (31): delayacct: Use sched_clock() sched: Rename sched_info_{queued,dequeued} sched: Simplify sched_info_on() kvm: Select SCHED_INFO instead of TASK_DELAY_ACCT delayacct: Add static_branch in scheduler hooks delayacct: Default disabled delayacct: Add sysctl to enable at runtime sched/fair: Add a few assertions sched: Provide raw_spin_rq_*lock*() helpers sched: Wrap rq::lock access sched: Prepare for Core-wide rq->lock sched: Core-wide rq->lock sched: Optimize rq_lockp() usage sched: Allow sched_core_put() from atomic context sched: Introduce sched_class::pick_task() sched: Basic tracking of matching tasks sched: Add core wide task selection and scheduling sched: Trivial forced-newidle balancer sched: Trivial core scheduling cookie management sched: Inherit task cookie on fork() sched,stats: Further simplify sched_info sched: Add CONFIG_SCHED_CORE help text sched,init: Fix DEBUG_PREEMPT vs early boot sched/fair: Age the average idle time sched: Unbreak wakeups sched: Introduce task_is_running() sched,perf,kvm: Fix preemption condition sched: Add get_current_state() sched,timer: Use __set_current_state() sched,arch: Remove unused TASK_STATE offsets sched: Change task_struct::state
Pierre Gondois (2): sched/fair: Only compute base_energy_pd if necessary sched/fair: Fix negative energy delta in find_energy_efficient_cpu()
Qais Yousef (3): sched/uclamp: Fix wrong implementation of cpu.uclamp.min sched/uclamp: Fix locking around cpu_util_update_eff() sched/uclamp: Fix uclamp_tg_restrict()
Rik van Riel (1): sched,fair: Skip newidle_balance if a wakeup is pending
Valentin Schneider (3): sched/core: Initialize the idle task with preemption disabled sched: Make the idle task quack like a per-CPU kthread sched: Don't defer CPU pick to migration_cpu_stop()
Vincent Donnefort (2): sched/rt: Fix RT utilization tracking during policy change sched/rt: Fix Deadline utilization tracking during policy change
Vincent Guittot (1): sched/pelt: Check that *_avg are null when *_sum are
Vineeth Pillai (1): sched/fair: Fix forced idle sibling starvation corner case
Yejune Deng (1): lib/smp_processor_id: Use is_percpu_thread() instead of nr_cpus_allowed
Zhaoyang Huang (1): psi: Fix race between psi_trigger_create/destroy
Documentation/accounting/delay-accounting.rst | 12 +- .../admin-guide/hw-vuln/core-scheduling.rst | 223 ++++ Documentation/admin-guide/hw-vuln/index.rst | 1 + Documentation/admin-guide/kernel-parameters.txt | 2 +- Documentation/admin-guide/sysctl/kernel.rst | 7 + Documentation/scheduler/sched-capacity.rst | 6 +- Documentation/scheduler/sched-energy.rst | 2 +- arch/alpha/kernel/process.c | 2 +- arch/alpha/kernel/smp.c | 1 - arch/arc/kernel/smp.c | 1 - arch/arc/kernel/stacktrace.c | 2 +- arch/arm/kernel/process.c | 2 +- arch/arm/kernel/smp.c | 1 - arch/arm64/include/asm/preempt.h | 2 +- arch/arm64/kernel/process.c | 2 +- arch/arm64/kernel/smp.c | 1 - arch/arm64/kvm/Kconfig | 5 +- arch/csky/kernel/asm-offsets.c | 1 - arch/csky/kernel/smp.c | 1 - arch/csky/kernel/stacktrace.c | 2 +- arch/h8300/kernel/asm-offsets.c | 1 - arch/h8300/kernel/process.c | 2 +- arch/hexagon/kernel/process.c | 2 +- arch/ia64/kernel/mca.c | 2 +- arch/ia64/kernel/process.c | 4 +- arch/ia64/kernel/ptrace.c | 8 +- arch/ia64/kernel/smpboot.c | 1 - arch/m68k/kernel/process.c | 2 +- arch/microblaze/kernel/asm-offsets.c | 1 - arch/mips/kernel/asm-offsets.c | 1 - arch/mips/kernel/process.c | 2 +- arch/mips/kernel/smp.c | 1 - arch/nds32/kernel/process.c | 2 +- arch/nios2/kernel/process.c | 2 +- arch/openrisc/kernel/asm-offsets.c | 1 - arch/openrisc/kernel/smp.c | 2 - arch/parisc/kernel/asm-offsets.c | 1 - arch/parisc/kernel/process.c | 4 +- arch/parisc/kernel/smp.c | 1 - arch/powerpc/kernel/process.c | 4 +- arch/powerpc/kernel/smp.c | 1 - arch/powerpc/xmon/xmon.c | 13 +- arch/riscv/kernel/smpboot.c | 1 - arch/riscv/kernel/stacktrace.c | 2 +- arch/s390/include/asm/preempt.h | 4 +- arch/s390/kernel/process.c | 2 +- arch/s390/kernel/smp.c | 1 - arch/s390/mm/fault.c | 2 +- arch/sh/kernel/process_32.c | 2 +- arch/sh/kernel/smp.c | 2 - arch/sparc/kernel/process_32.c | 3 +- arch/sparc/kernel/process_64.c | 3 +- arch/sparc/kernel/smp_32.c | 1 - arch/sparc/kernel/smp_64.c | 3 - arch/um/kernel/process.c | 2 +- arch/x86/include/asm/preempt.h | 2 +- arch/x86/kernel/process.c | 4 +- arch/x86/kernel/smpboot.c | 1 - arch/x86/kvm/Kconfig | 5 +- arch/xtensa/kernel/process.c | 2 +- arch/xtensa/kernel/smp.c | 1 - block/blk-mq.c | 6 +- drivers/cpuidle/governors/menu.c | 6 +- drivers/md/dm.c | 6 +- drivers/net/ethernet/qualcomm/qca_spi.c | 6 +- drivers/thermal/cpufreq_cooling.c | 2 +- drivers/usb/gadget/udc/max3420_udc.c | 15 +- drivers/usb/host/max3421-hcd.c | 3 +- fs/binfmt_elf.c | 8 +- fs/binfmt_elf_fdpic.c | 4 +- fs/proc/loadavg.c | 2 +- fs/proc/stat.c | 4 +- fs/userfaultfd.c | 4 +- include/asm-generic/preempt.h | 2 +- include/linux/delayacct.h | 22 +- include/linux/energy_model.h | 16 +- include/linux/kthread.h | 2 + include/linux/sched.h | 50 +- include/linux/sched/cpufreq.h | 2 +- include/linux/sched/debug.h | 2 +- include/linux/sched/sd_flags.h | 10 + include/linux/sched/signal.h | 2 +- include/linux/sched/stat.h | 16 +- include/linux/sched_clock.h | 2 +- include/uapi/linux/prctl.h | 8 + init/init_task.c | 2 +- init/main.c | 17 +- kernel/Kconfig.preempt | 20 + kernel/cgroup/cgroup-v1.c | 2 +- kernel/debug/kdb/kdb_support.c | 18 +- kernel/delayacct.c | 71 +- kernel/events/core.c | 7 +- kernel/fork.c | 12 +- kernel/freezer.c | 2 +- kernel/hung_task.c | 2 +- kernel/kcsan/report.c | 2 +- kernel/kthread.c | 34 +- kernel/locking/lockdep.c | 2 +- kernel/locking/mutex.c | 6 +- kernel/locking/rtmutex.c | 4 +- kernel/locking/rwsem.c | 2 +- kernel/ptrace.c | 12 +- kernel/rcu/rcutorture.c | 4 +- kernel/rcu/tree_plugin.h | 2 +- kernel/rcu/tree_stall.h | 12 +- kernel/sched/Makefile | 1 + kernel/sched/core.c | 1138 +++++++++++++++++--- kernel/sched/core_sched.c | 229 ++++ kernel/sched/cpuacct.c | 12 +- kernel/sched/cpufreq_schedutil.c | 1 + kernel/sched/deadline.c | 50 +- kernel/sched/debug.c | 4 +- kernel/sched/fair.c | 440 +++++--- kernel/sched/idle.c | 13 +- kernel/sched/isolation.c | 4 +- kernel/sched/loadavg.c | 2 +- kernel/sched/pelt.h | 2 +- kernel/sched/psi.c | 12 +- kernel/sched/rt.c | 48 +- kernel/sched/sched.h | 437 ++++++-- kernel/sched/stats.h | 68 +- kernel/sched/stop_task.c | 14 +- kernel/sched/topology.c | 213 ++-- kernel/signal.c | 2 +- kernel/smpboot.c | 1 - kernel/softirq.c | 5 +- kernel/sys.c | 5 + kernel/sysctl.c | 12 + kernel/time/timer.c | 2 +- lib/smp_processor_id.c | 6 +- lib/syscall.c | 4 +- mm/compaction.c | 2 +- net/core/dev.c | 2 +- tools/include/uapi/linux/prctl.h | 8 + tools/testing/selftests/sched/.gitignore | 1 + tools/testing/selftests/sched/Makefile | 14 + tools/testing/selftests/sched/config | 1 + tools/testing/selftests/sched/cs_prctl_test.c | 338 ++++++ virt/kvm/kvm_main.c | 2 +- 139 files changed, 3122 insertions(+), 781 deletions(-) create mode 100644 Documentation/admin-guide/hw-vuln/core-scheduling.rst create mode 100644 kernel/sched/core_sched.c create mode 100644 tools/testing/selftests/sched/.gitignore create mode 100644 tools/testing/selftests/sched/Makefile create mode 100644 tools/testing/selftests/sched/config create mode 100644 tools/testing/selftests/sched/cs_prctl_test.c
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