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Message-ID: <ca8ceefd49d27fa71aed4859c0037b2f@kernel.org>
Date: Mon, 01 Dec 2025 13:48:47 -1000
From: Tejun Heo <tj@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: David Vernet <void@...ifault.com>, Andrea Righi <arighi@...dia.com>,
Changwoo Min <multics69@...il.com>, linux-kernel@...r.kernel.org,
sched-ext@...ts.linux.dev
Subject: [GIT PULL] sched_ext: Changes for v6.19
The following changes since commit 81e839803f9355084bc78f9e0c350c4e2853c880:
Merge tag 'cgroup-for-6.19' into pr-base-for-6.19 (2025-12-01 13:20:56 -1000)
are available in the Git repository at:
https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git tags/sched_ext-for-6.19
for you to fetch changes up to 1dd6c84f1c544e552848a8968599220bd464e338:
sched_ext: Fix incorrect sched_class settings for per-cpu migration tasks (2025-12-01 10:58:49 -1000)
Please note that sched_ext-for-6.19 is based on v6.18 + tip/sched-core-2025-12-01
+ cgroup/for-6.19.
When merging sched_ext-for-6.19 into the above base, there is a trivial merge
conflict in kernel/sched/ext.c around pick_task_scx(). Both sched_ext and tip
sched/core independently pulled in a8ad873113d3 ("sched_ext: defer
queue_balance_callback() until after ops.dispatch") resolving conflicts
slightly differently (whitespace only). 67fa319f5fff ("sched_ext: Allow
forcibly picking an scx task") then added further changes in the same area.
Resolve by taking the sched_ext side.
----------------------------------------------------------------
sched_ext: Changes for v6.19
- Improve recovery from misbehaving BPF schedulers. When a scheduler puts many
tasks with varying affinity restrictions on a shared DSQ, CPUs scanning
through tasks they cannot run can overwhelm the system, causing lockups.
Bypass mode now uses per-CPU DSQs with a load balancer to avoid this, and
hooks into the hardlockup detector to attempt recovery. Add scx_cpu0 example
scheduler to demonstrate this scenario.
- Add lockless peek operation for DSQs to reduce lock contention for schedulers
that need to query queue state during load balancing.
- Allow scx_bpf_reenqueue_local() to be called from anywhere in preparation for
deprecating cpu_acquire/release() callbacks in favor of generic BPF hooks.
- Prepare for hierarchical scheduler support: add scx_bpf_task_set_slice() and
scx_bpf_task_set_dsq_vtime() kfuncs, make scx_bpf_dsq_insert*() return bool,
and wrap kfunc args in structs for future aux__prog parameter.
- Implement cgroup_set_idle() callback to notify BPF schedulers when a cgroup's
idle state changes.
- Fix migration tasks being incorrectly downgraded from stop_sched_class to
rt_sched_class across sched_ext enable/disable. Applied late as the fix is
low risk and the bug subtle but needs stable backporting.
- Various fixes and cleanups including cgroup exit ordering, SCX_KICK_WAIT
reliability, and backward compatibility improvements.
----------------------------------------------------------------
Andrea Righi (4):
sched_ext: Exit early on hotplug events during attach
sched_ext: Allow forcibly picking an scx task
sched_ext: Fix scx_bpf_dsq_peek() with FIFO DSQs
sched_ext: Update comments replacing breather with aborting mechanism
Rong Tao (1):
sched_ext: tools: Removing duplicate targets during non-cross compilation
Ryan Newton (2):
sched_ext: Add lockless peek operation for DSQs
sched_ext: Add a selftest for scx_bpf_dsq_peek
Tejun Heo (34):
tools/sched_ext: Strip compatibility macros for cgroup and dispatch APIs
sched_ext: Add scx_bpf_task_set_slice() and scx_bpf_task_set_dsq_vtime()
sched_ext: Wrap kfunc args in struct to prepare for aux__prog
sched_ext: Make scx_bpf_dsq_insert*() return bool
sched_ext/tools: Add compat wrapper for scx_bpf_task_set_slice/dsq_vtime()
sched_ext: Fix scx_bpf_dsq_insert() backward binary compatibility
sched_ext: Don't kick CPUs running higher classes
sched_ext: Fix SCX_KICK_WAIT to work reliably
sched_ext: Rename pnt_seq to kick_sync
sched_ext: Use rhashtable_lookup() instead of rhashtable_lookup_fast()
sched_ext: Add ___compat suffix to scx_bpf_dsq_insert___v2 in compat.bpf.h
sched_ext: Use SCX_TASK_READY test instead of tryget_task_struct() during class switch
sched_ext: Split schedule_deferred() into locked and unlocked variants
sched_ext: Factor out reenq_local() from scx_bpf_reenqueue_local()
sched_ext: Allow scx_bpf_reenqueue_local() to be called from anywhere
sched_ext/tools: Restore backward compat with v6.12 kernels
sched_ext: Fix cgroup exit ordering by moving sched_ext_free() to finish_task_switch()
sched_ext: Move __SCX_DSQ_ITER_ALL_FLAGS BUILD_BUG_ON to the right place
sched_ext: Minor cleanups to scx_task_iter
sched_ext: Mark racy bitfields to prevent adding fields that can't tolerate races
sched_ext: Use shorter slice in bypass mode
sched_ext: Refactor do_enqueue_task() local and global DSQ paths
sched_ext: Use per-CPU DSQs instead of per-node global DSQs in bypass mode
sched_ext: Simplify breather mechanism with scx_aborting flag
sched_ext: Exit dispatch and move operations immediately when aborting
sched_ext: Make scx_exit() and scx_vexit() return bool
sched_ext: Refactor lockup handlers into handle_lockup()
sched_ext: Make handle_lockup() propagate scx_verror() result
sched_ext: Hook up hardlockup detector
sched_ext: Add scx_cpu0 example scheduler
sched_ext: Factor out scx_dsq_list_node cursor initialization into INIT_DSQ_LIST_CURSOR
sched_ext: Factor out abbreviated dispatch dequeue into dispatch_dequeue_locked()
sched_ext: Implement load balancer for bypass mode
sched_ext: Pass locked CPU parameter to scx_hardlockup() and add docs
Zqiang (2):
sched_ext: Use kvfree_rcu() to release per-cpu ksyncs object
sched_ext: Fix incorrect sched_class settings for per-cpu migration tasks
zhidao su (1):
sched/ext: Implement cgroup_set_idle() callback
include/linux/sched/ext.h | 27 +-
include/trace/events/sched_ext.h | 39 +
kernel/fork.c | 1 -
kernel/sched/core.c | 6 +
kernel/sched/ext.c | 1068 ++++++++++++++++------
kernel/sched/ext_idle.c | 43 +-
kernel/sched/ext_internal.h | 29 +-
kernel/sched/sched.h | 4 +-
kernel/watchdog.c | 9 +
tools/sched_ext/Makefile | 4 +-
tools/sched_ext/include/scx/common.bpf.h | 15 +-
tools/sched_ext/include/scx/compat.bpf.h | 314 ++++--
tools/sched_ext/include/scx/compat.h | 14 +
tools/sched_ext/scx_cpu0.bpf.c | 88 ++
tools/sched_ext/scx_cpu0.c | 106 +++
tools/sched_ext/scx_flatcg.bpf.c | 10 +-
tools/sched_ext/scx_qmap.bpf.c | 52 +-
tools/testing/selftests/sched_ext/Makefile | 1 +
tools/testing/selftests/sched_ext/peek_dsq.bpf.c | 251 +++++
tools/testing/selftests/sched_ext/peek_dsq.c | 224 +++++
20 files changed, 1894 insertions(+), 411 deletions(-)
create mode 100644 tools/sched_ext/scx_cpu0.bpf.c
create mode 100644 tools/sched_ext/scx_cpu0.c
create mode 100644 tools/testing/selftests/sched_ext/peek_dsq.bpf.c
create mode 100644 tools/testing/selftests/sched_ext/peek_dsq.c
Thanks.
--
tejun
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