linux-kernel - [GIT PULL] sched_ext: Fixes for v6.17-rc7

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Message-ID: <aNF-Mqjnu_phEgvP@slm.duckdns.org>
Date: Mon, 22 Sep 2025 06:49:54 -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: Fixes for v6.17-rc7

The following changes since commit a1eab4d813f7b6e606ed21381b8cfda5c59a87e5:

  sched_ext, sched/core: Fix build failure when !FAIR_GROUP_SCHED && EXT_GROUP_SCHED (2025-09-16 23:07:27 -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-6.17-rc7-fixes

for you to fetch changes up to 55ed11b181c43d81ce03b50209e4e7c4a14ba099:

  sched_ext: idle: Handle migration-disabled tasks in BPF code (2025-09-22 06:24:44 -1000)

----------------------------------------------------------------
sched_ext: Fixes for v6.17-rc7

This contains a fix for sched_ext idle CPU selection that likely fixes
a substantial performance regression.

The scx_bpf_select_cpu_dfl/and() kfuncs were incorrectly detecting all
tasks as migration-disabled when called outside ops.select_cpu(), causing
them to always return -EBUSY instead of finding idle CPUs. The fix properly
distinguishes between genuinely migration-disabled tasks vs. the current
task whose migration is temporarily disabled by BPF execution.

----------------------------------------------------------------
Andrea Righi (1):
      sched_ext: idle: Handle migration-disabled tasks in BPF code

 kernel/sched/ext_idle.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

-- 
tejun