[GIT PULL] scheduler changes for v5.14

From: Ingo Molnar
Date: Mon Jun 28 2021 - 02:51:45 EST

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@xxxxxxxxxx>
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