| From: |
| Tejun Heo <tj-AT-kernel.org> |
| To: |
| David Vernet <void-AT-manifault.com>, Andrea Righi <arighi-AT-nvidia.com>, Changwoo Min <changwoo-AT-igalia.com> |
| Subject: |
| [PATCHSET sched_ext/for-7.3] sched_ext: Sub-scheduler follow-ups |
| Date: |
| Tue, 14 Jul 2026 13:09:13 -1000 |
| Message-ID: |
| <20260714230917.84158-1-tj@kernel.org> |
| Cc: |
| Emil Tsalapatis <emil-AT-etsalapatis.com>, sched-ext-AT-lists.linux.dev, linux-kernel-AT-vger.kernel.org, Tejun Heo <tj-AT-kernel.org> |
| Archive-link: |
| Article |
Hello,
Follow-ups to the sub-scheduler capability series, addressing two things
Andrea raised while reviewing v5[1]: sched teardown drained queued ecaps
syncs with an msleep() poll loop, and with CONFIG_EXT_SUB_SCHED=y hot paths
keep paying for sub-sched bookkeeping even when no sub-scheduler exists.
Patch 0001 replaces the teardown poll loop with direct removal from the
llist. Patches 0002-0003 are prep and 0004 adds the scx_has_subs static key
and gates the sub-sched portions of hot paths on it.
[1] https://lore.kernel.org/r/20260709225041.1695495-1-tj@ker...
Based on sched_ext/for-7.3 (35f9cbbacb67).
This patchset contains the following 4 patches.
0001 sched_ext: Remove queued ecaps syncs directly on sched teardown
0002 sched_ext: Move scx_dispatch_sched() from sub.h to internal.h
0003 sched_ext: Gate sub_dispatch_prev with CONFIG_EXT_SUB_SCHED
0004 sched_ext: Add the scx_has_subs static key and gate sub-sched hot paths
The patchset is also available in the following git branch:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git scx-sub-followups
diffstat follows. Thanks.
kernel/sched/ext/ext.c | 6 +-
kernel/sched/ext/idle.c | 10 ++++
kernel/sched/ext/internal.h | 133 +++++++++++++++++++++++++++++++++++++++++++-
kernel/sched/ext/sub.c | 88 ++++++++++++++++++++---------
kernel/sched/ext/sub.h | 124 +++++------------------------------------
kernel/sched/sched.h | 3 +-
6 files changed, 223 insertions(+), 141 deletions(-)
--
tejun