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Message-ID: <41d26de7756d571845b9feb04a4e8e9d@kernel.org>
Date: Fri, 26 Sep 2025 09:40:26 -1000
From: Tejun Heo <tj@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, David Vernet <void@...ifault.com>, Andrea Righi <arighi@...dia.com>, Changwoo Min <changwoo@...lia.com>, sched-ext@...ts.linux.dev
Subject: [GIT PULL] sched_ext: Changes for v6.18
The following changes since commit 55ed11b181c43d81ce03b50209e4e7c4a14ba099:
sched_ext: idle: Handle migration-disabled tasks in BPF code (2025-09-22 06:24:44 -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-6.18
for you to fetch changes up to df10932ad740ba1f871b6dd2ddafc7dc8cea944f:
Revert "sched_ext: Use rhashtable_lookup() instead of rhashtable_lookup_fast()" (2025-09-23 20:38:23 -1000)
----------------------------------------------------------------
sched_ext: Changes for v6.18
- Code organization cleanup. Separate internal types and accessors to
ext_internal.h to reduce the size of ext.c and improve maintainability.
- Prepare for cgroup sub-scheduler support by adding @sch parameter to
various functions and helpers, reorganizing scheduler instance handling,
and dropping obsolete helpers like scx_kf_exit() and kf_cpu_valid().
- Add new scx_bpf_cpu_curr() and scx_bpf_locked_rq() BPF helpers to provide
safer access patterns with proper RCU protection. scx_bpf_cpu_rq() is
deprecated with warnings due to potential race conditions.
- Improve debugging with migration-disabled counter in error state dumps,
SCX_EFLAG_INITIALIZED flag, bitfields for warning flags, and other
enhancements to help diagnose issues.
- Use cgroup_lock/unlock() for cgroup synchronization instead of
scx_cgroup_rwsem based synchronization. This is simpler and allows
enable/disable paths to synchronize against cgroup changes independent of
the CPU controller.
- rhashtable_lookup() replacement to avoid redundant RCU locking was
reverted due to RCU usage warnings. Will be redone once rhashtable is
updated to use rcu_dereference_all().
- Other misc updates and fixes including bypass handling improvements,
scx_task_iter_relock() improvements, tools/sched_ext updates, and
compatibility helpers.
----------------------------------------------------------------
Andrea Righi (5):
tools/sched_ext: Receive updates from SCX repo
tools/sched_ext: Add compat helper for scx_bpf_cpu_curr()
sched_ext: Fix NULL dereference in scx_bpf_cpu_rq() warning
sched_ext: Add migration-disabled counter to error state dump
sched_ext: Verify RCU protection in scx_bpf_cpu_curr()
Christian Loehle (3):
sched_ext: Introduce scx_bpf_locked_rq()
sched_ext: Introduce scx_bpf_cpu_curr()
sched_ext: deprecation warn for scx_bpf_cpu_rq()
Tejun Heo (21):
sched_ext: Make explicit scx_task_iter_relock() calls unnecessary
sched_ext: Keep bypass on between enable failure and scx_disable_workfn()
sched_ext: Move internal type and accessor definitions to ext_internal.h
sched_ext: Put event_stats_cpu in struct scx_sched_pcpu
sched_ext: Use cgroup_lock/unlock() to synchronize against cgroup operations
sched_ext: Use rhashtable_lookup() instead of rhashtable_lookup_fast()
sched_ext: Improve SCX_KF_DISPATCH comment
sched_ext: Fix stray scx_root usage in task_can_run_on_remote_rq()
sched_ext: Use bitfields for boolean warning flags
sched_ext: Add SCX_EFLAG_INITIALIZED to indicate successful ops.init()
sched_ext: Make qmap dump operation non-destructive
tools/sched_ext: scx_qmap: Make debug output quieter by default
sched_ext: Separate out scx_kick_cpu() and add @sch to it
sched_ext: Add the @sch parameter to __bstr_format()
sched_ext: Add the @sch parameter to ext_idle helpers
sched_ext: Drop kf_cpu_valid()
sched_ext: Add the @sch parameter to scx_dsq_insert_preamble/commit()
sched_ext: Drop scx_kf_exit() and scx_kf_error()
sched_ext: Misc updates around scx_sched instance pointer
sched_ext: Merge branch 'for-6.17-fixes' into for-6.18
Revert "sched_ext: Use rhashtable_lookup() instead of rhashtable_lookup_fast()"
include/linux/sched/ext.h | 6 +-
kernel/sched/build_policy.c | 1 +
kernel/sched/core.c | 2 -
kernel/sched/ext.c | 1556 ++++----------------
kernel/sched/ext.h | 25 -
kernel/sched/ext_idle.c | 146 +-
kernel/sched/ext_internal.h | 1078 ++++++++++++++
tools/sched_ext/include/scx/bpf_arena_common.bpf.h | 175 +++
tools/sched_ext/include/scx/bpf_arena_common.h | 33 +
tools/sched_ext/include/scx/common.bpf.h | 104 +-
tools/sched_ext/include/scx/common.h | 5 +-
tools/sched_ext/include/scx/compat.bpf.h | 22 +
tools/sched_ext/include/scx/user_exit_info.bpf.h | 40 +
tools/sched_ext/include/scx/user_exit_info.h | 49 +-
.../sched_ext/include/scx/user_exit_info_common.h | 30 +
tools/sched_ext/scx_central.bpf.c | 2 +-
tools/sched_ext/scx_central.c | 1 +
tools/sched_ext/scx_flatcg.bpf.c | 2 +-
tools/sched_ext/scx_flatcg.c | 2 +
tools/sched_ext/scx_qmap.bpf.c | 98 +-
tools/sched_ext/scx_qmap.c | 12 +-
tools/sched_ext/scx_simple.c | 2 +
22 files changed, 1992 insertions(+), 1399 deletions(-)
create mode 100644 kernel/sched/ext_internal.h
create mode 100644 tools/sched_ext/include/scx/bpf_arena_common.bpf.h
create mode 100644 tools/sched_ext/include/scx/bpf_arena_common.h
create mode 100644 tools/sched_ext/include/scx/user_exit_info.bpf.h
create mode 100644 tools/sched_ext/include/scx/user_exit_info_common.h
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