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Date: Wed, 28 Apr 2021 10:56:06 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Mel Gorman <mgorman@...e.de>,
Valentin Schneider <valentin.schneider@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] scheduler updates for v5.13
Linus,
Please pull the latest sched/core git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-core-2021-04-28
# HEAD: 2ea46c6fc9452ac100ad907b051d797225847e33 cpumask/hotplug: Fix cpu_dying() state tracking
Scheduler updates for this cycle are:
- Clean up SCHED_DEBUG: move the decades old mess of sysctl, procfs and debugfs interfaces
to a unified debugfs interface.
- Signals: Allow caching one sigqueue object per task, to improve performance & latencies.
- Improve newidle_balance() irq-off latencies on systems with a large number of CPU cgroups.
- Improve energy-aware scheduling
- Improve the PELT metrics for certain workloads
- Reintroduce select_idle_smt() to improve load-balancing locality - but without the previous
regressions
- Add 'scheduler latency debugging': warn after long periods of pending need_resched. This
is an opt-in feature that requires the enabling of the LATENCY_WARN scheduler feature,
or the use of the resched_latency_warn_ms=xx boot parameter.
- CPU hotplug fixes for HP-rollback, and for the 'fail' interface. Fix remaining
balance_push() vs. hotplug holes/races
- PSI fixes, plus allow /proc/pressure/ files to be written by CAP_SYS_RESOURCE tasks as well
- Fix/improve various load-balancing corner cases vs. capacity margins
- Fix sched topology on systems with NUMA diameter of 3 or above
- Fix PF_KTHREAD vs to_kthread() race
- Minor rseq optimizations
- Misc cleanups, optimizations, fixes and smaller updates
Thanks,
Ingo
------------------>
Aubrey Li (1):
sched/fair: Reduce long-tail newly idle balance cost
Barry Song (3):
sched/topology: fix the issue groups don't span domain->span for NUMA diameter > 2
sched/fair: Optimize test_idle_cores() for !SMT
sched/topology: Remove redundant cpumask_and() in init_overlap_sched_group()
Charan Teja Reddy (1):
sched,psi: Handle potential task count underflow bugs more gracefully
Chengming Zhou (3):
psi: Add PSI_CPU_FULL state
psi: Use ONCPU state tracking machinery to detect reclaim
psi: Optimize task switch inside shared cgroups
Clement Courbet (1):
sched: Optimize __calc_delta()
Edmundo Carmona Antoranz (1):
sched: Remove unnecessary variable from schedule_tail()
Eric Dumazet (3):
rseq: Optimize rseq_update_cpu_id()
rseq: Remove redundant access_ok()
rseq: Optimise rseq_get_rseq_cs() and clear_rseq_cs()
Ingo Molnar (1):
sched: Fix various typos
Johannes Weiner (1):
psi: Pressure states are unlikely
Josh Hunt (1):
psi: allow unprivileged users with CAP_SYS_RESOURCE to write psi files
Lingutla Chandrasekhar (1):
sched/fair: Ignore percpu threads for imbalance pulls
Mel Gorman (1):
sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED_DEBUG
Paul Turner (1):
sched: Warn on long periods of pending need_resched
Peter Zijlstra (14):
cpumask: Make cpu_{online,possible,present,active}() inline
cpumask: Introduce DYING mask
sched: Use cpu_dying() to fix balance_push vs hotplug-rollback
sched: Remove sched_schedstats sysctl out from under SCHED_DEBUG
sched: Don't make LATENCYTOP select SCHED_DEBUG
sched: Move SCHED_DEBUG sysctl to debugfs
sched,preempt: Move preempt_dynamic to debug.c
debugfs: Implement debugfs_create_str()
sched,debug: Convert sysctl sched_domains to debugfs
sched: Move /proc/sched_debug to debugfs
sched,fair: Alternative sched_slice()
sched/debug: Rename the sched_debug parameter to sched_verbose
kthread: Fix PF_KTHREAD vs to_kthread() race
cpumask/hotplug: Fix cpu_dying() state tracking
Piotr Figiel (1):
rseq, ptrace: Add PTRACE_GET_RSEQ_CONFIGURATION request
Rasmus Villemoes (2):
sched/core: Stop using magic values in sched_dynamic_mode()
sched/core: Use -EINVAL in sched_dynamic_mode()
Rik van Riel (1):
sched/fair: Bring back select_idle_smt(), but differently
Sebastian Andrzej Siewior (1):
kcov: Remove kcov include from sched.h and move it to its users.
Shakeel Butt (1):
psi: Reduce calls to sched_clock() in psi
Thomas Gleixner (2):
signal: Hand SIGQUEUE_PREALLOC flag to __sigqueue_alloc()
signal: Allow tasks to cache one sigqueue struct
Valentin Schneider (5):
sched: Simplify migration_cpu_stop()
sched/fair: Fix shift-out-of-bounds in load_balance()
stop_machine: Add caller debug info to queue_stop_cpus_work
sched/fair: Clean up active balance nr_balance_failed trickery
sched/fair: Introduce a CPU capacity comparison helper
Vincent Donnefort (6):
sched/fair: Fix task utilization accountability in compute_energy()
sched/fair: use lsub_positive in cpu_util_next()
sched/pelt: Fix task util_est update filtering
cpu/hotplug: Allowing to reset fail injection
cpu/hotplug: CPUHP_BRINGUP_CPU failure exception
cpu/hotplug: Add cpuhp_invoke_callback_range()
Vincent Guittot (7):
sched/fair: Remove update of blocked load from newidle_balance
sched/fair: Remove unused return of _nohz_idle_balance
sched/fair: Remove unused parameter of update_nohz_stats
sched/fair: Merge for each idle cpu loop of ILB
sched/fair: Reorder newidle_balance pulled_task tests
sched/fair: Trigger the update of blocked load on newly idle cpu
sched/fair: Reduce the window for duplicated update
Waiman Long (1):
sched/debug: Fix cgroup_path[] serialization
YueHaibing (1):
sched/fair: Move update_nohz_stats() to the CONFIG_NO_HZ_COMMON block to simplify the code & fix an unused function warning
Documentation/admin-guide/kernel-parameters.txt | 2 +-
Documentation/scheduler/sched-domains.rst | 10 +-
drivers/usb/usbip/usbip_common.h | 1 +
fs/debugfs/file.c | 91 +++++
include/linux/cpumask.h | 117 +++++--
include/linux/debugfs.h | 17 +
include/linux/kcov.h | 1 +
include/linux/psi.h | 1 -
include/linux/psi_types.h | 3 +-
include/linux/sched.h | 4 +-
include/linux/sched/sysctl.h | 9 +-
include/linux/signal.h | 1 +
include/uapi/linux/ptrace.h | 10 +
kernel/cpu.c | 210 ++++++++----
kernel/exit.c | 1 +
kernel/fork.c | 1 +
kernel/kthread.c | 33 +-
kernel/ptrace.c | 25 ++
kernel/rseq.c | 29 +-
kernel/sched/clock.c | 2 +-
kernel/sched/core.c | 217 ++++++------
kernel/sched/cpuacct.c | 2 +-
kernel/sched/cpufreq_schedutil.c | 2 +-
kernel/sched/cpupri.c | 4 +-
kernel/sched/cputime.c | 2 +-
kernel/sched/deadline.c | 12 +-
kernel/sched/debug.c | 435 +++++++++++++-----------
kernel/sched/fair.c | 380 +++++++++++----------
kernel/sched/features.h | 7 +-
kernel/sched/idle.c | 10 +-
kernel/sched/loadavg.c | 2 +-
kernel/sched/pelt.c | 2 +-
kernel/sched/pelt.h | 2 +-
kernel/sched/psi.c | 164 +++++----
kernel/sched/rt.c | 6 +-
kernel/sched/sched.h | 59 +++-
kernel/sched/stats.c | 2 +-
kernel/sched/stats.h | 37 +-
kernel/sched/topology.c | 113 +++---
kernel/signal.c | 59 +++-
kernel/stop_machine.c | 1 +
kernel/sysctl.c | 94 -----
lib/Kconfig.debug | 1 -
net/core/skbuff.c | 1 +
net/mac80211/iface.c | 1 +
net/mac80211/rx.c | 1 +
46 files changed, 1284 insertions(+), 900 deletions(-)
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