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From: Tejun Heo <tj@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, David Vernet <void@manifault.com>,
	Andrea Righi <arighi@nvidia.com>,
	Changwoo Min <changwoo@igalia.com>,
	sched-ext@lists.linux.dev
Subject: [GIT PULL] sched_ext: Fixes for v6.17-rc7
Date: Mon, 22 Sep 2025 06:49:54 -1000	[thread overview]
Message-ID: <aNF-Mqjnu_phEgvP@slm.duckdns.org> (raw)

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

             reply	other threads:[~2025-09-22 16:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-22 16:49 Tejun Heo [this message]
2025-09-22 19:11 ` pr-tracker-bot
2025-09-23 15:12 ` Linus Torvalds
2025-09-23 15:15   ` Tejun Heo
2025-09-23 15:25     ` Linus Torvalds

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