linux-next.git/kernel/sched/ext.h, branch master

sched_ext: Move sources under kernel/sched/ext/

2026-06-22T15:32:56+00:00

The sched_ext sources had grown to ten ext* files directly under kernel/sched/. Move them into a new kernel/sched/ext/ subdirectory and drop the now-redundant ext_ prefix. ext.c/h keep their names. kernel/sched/ext.{c,h} -> kernel/sched/ext/ext.{c,h} kernel/sched/ext_internal.h -> kernel/sched/ext/internal.h kernel/sched/ext_types.h -> kernel/sched/ext/types.h kernel/sched/ext_idle.{c,h} -> kernel/sched/ext/idle.{c,h} kernel/sched/ext_cid.{c,h} -> kernel/sched/ext/cid.{c,h} kernel/sched/ext_arena.{c,h} -> kernel/sched/ext/arena.{c,h} The include paths in build_policy.c and sched.h, the MAINTAINERS glob, and a few documentation and comment references are updated to match. No code or symbol changes. Suggested-by: Linus Torvalds Reviewed-by: Andrea Righi Signed-off-by: Tejun Heo

sched_ext: Add @kargs to scx_fork()

2026-03-06T17:58:02+00:00

Make sched_cgroup_fork() pass @kargs to scx_fork(). This will be used to determine @p's cgroup for cgroup sub-sched support. Signed-off-by: Tejun Heo Reviewed-by: Andrea Righi Cc: Peter Zijlstra

sched_ext: Use cgroup_lock/unlock() to synchronize against cgroup operations

2025-09-03T21:36:07+00:00

SCX hooks into CPU cgroup controller operations and read-locks scx_cgroup_rwsem to exclude them while enabling and disable schedulers. While this works, it's unnecessarily complicated given that cgroup_[un]lock() are available and thus the cgroup operations can be locked out that way. Drop scx_cgroup_rwsem locking from the tg on/offline and cgroup [can_]attach operations. Instead, grab cgroup_lock() from scx_cgroup_lock(). Drop scx_cgroup_finish_attach() which is no longer necessary. Drop the now unnecessary rcu locking and css ref bumping in scx_cgroup_init() and scx_cgroup_exit(). As scx_cgroup_set_weight/bandwidth() paths aren't protected by cgroup_lock(), rename scx_cgroup_rwsem to scx_cgroup_ops_rwsem and retain the locking there. This is overall simpler and will also allow enable/disable paths to synchronize against cgroup changes independent of the CPU controller. Signed-off-by: Tejun Heo Cc: Peter Zijlstra Acked-by: Andrea Righi

sched_ext: Move internal type and accessor definitions to ext_internal.h

2025-09-03T21:33:28+00:00

There currently isn't a place to place SCX-internal types and accessors to be shared between ext.c and ext_idle.c. Create kernel/sched/ext_internal.h and move internal type and accessor definitions there. This trims ext.c a bit and makes future additions easier. Pure code reorganization. No functional changes. Signed-off-by: Tejun Heo Acked-by: Andrea Righi

sched_ext: Add support for cgroup bandwidth control interface

2025-06-21T03:03:51+00:00

From 077814f57f8acce13f91dc34bbd2b7e4911fbf25 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 13 Jun 2025 15:06:47 -1000 - Add CONFIG_GROUP_SCHED_BANDWIDTH which is selected by both CONFIG_CFS_BANDWIDTH and EXT_GROUP_SCHED. - Put bandwidth control interface files for both cgroup v1 and v2 under CONFIG_GROUP_SCHED_BANDWIDTH. - Update tg_bandwidth() to fetch configuration parameters from fair if CONFIG_CFS_BANDWIDTH, SCX otherwise. - Update tg_set_bandwidth() to update the parameters for both fair and SCX. - Add bandwidth control parameters to struct scx_cgroup_init_args. - Add sched_ext_ops.cgroup_set_bandwidth() which is invoked on bandwidth control parameter updates. - Update scx_qmap and maximal selftest to test the new feature. Signed-off-by: Tejun Heo

sched_ext: Merge branch 'for-6.16-fixes' into for-6.17

2025-06-21T03:01:21+00:00

Pull sched_ext/for-6.16-fixes to receive: c50784e99f0e ("sched_ext: Make scx_group_set_weight() always update tg->scx.weight") 33796b91871a ("sched_ext, sched/core: Don't call scx_group_set_weight() prematurely from sched_create_group()") which are needed to implement CPU bandwidth control interface support. Signed-off-by: Tejun Heo

sched_ext, sched/core: Don't call scx_group_set_weight() prematurely from sched_create_group()

2025-06-17T18:19:55+00:00

During task_group creation, sched_create_group() calls scx_group_set_weight() with CGROUP_WEIGHT_DFL to initialize the sched_ext portion. This is premature and ends up calling ops.cgroup_set_weight() with an incorrect @cgrp before ops.cgroup_init() is called. sched_create_group() should just initialize SCX related fields in the new task_group. Fix it by factoring out scx_tg_init() from sched_init() and making sched_create_group() call that function instead of scx_group_set_weight(). v2: Retain CONFIG_EXT_GROUP_SCHED ifdef in sched_init() as removing it leads to build failures on !CONFIG_GROUP_SCHED configs. Signed-off-by: Tejun Heo Fixes: 819513666966 ("sched_ext: Add cgroup support") Cc: stable@vger.kernel.org # v6.12+

sched_ext: Always use SMP versions in kernel/sched/ext.h

2025-06-14T00:30:58+00:00

Simplify the scheduler by making formerly SMP-only primitives and data structures unconditional. tj: Updated subject for clarity. Replace #if defined() with #ifdef. Signed-off-by: Cheng-Yang Chou Signed-off-by: Tejun Heo

sched_ext: Make scx_locked_rq() inline

2025-06-09T16:25:35+00:00

scx_locked_rq() is used both from ext.c and ext_idle.c, move it to ext.h as a static inline function. No functional changes. v2: Rename locked_rq to scx_locked_rq_state, expose it and make scx_locked_rq() inline, as suggested by Tejun. Signed-off-by: Andrea Righi Signed-off-by: Tejun Heo

sched_ext: Make scx_rq_bypassing() inline

2025-06-09T16:25:24+00:00

scx_rq_bypassing() is used both from ext.c and ext_idle.c, move it to ext.h as a static inline function. No functional changes. Signed-off-by: Andrea Righi Signed-off-by: Tejun Heo