linux-kernel - [GIT PULL] sched_ext: A fix for v6.14-rc4

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Message-ID: <Z7-AF0Oi6TF24bl5@slm.duckdns.org>
Date: Wed, 26 Feb 2025 10:56:55 -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>,
	Changwoo Min <changwoo@...lia.com>,
	Andrea Righi <arighi@...dia.com>
Subject: [GIT PULL] sched_ext: A fix for v6.14-rc4

The following changes since commit f5717c93a1b999970f3a64d771a1a9ee68cc37d0:

  sched_ext: Use SCX_CALL_OP_TASK in task_tick_scx (2025-02-13 06:57:33 -1000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git/ tags/sched_ext-for-6.14-rc4-fixes

for you to fetch changes up to 8fef0a3b17bb258130a4fcbcb5addf94b25e9ec5:

  sched_ext: Fix pick_task_scx() picking non-queued tasks when it's called without balance() (2025-02-25 08:28:52 -1000)

----------------------------------------------------------------
sched_ext: A fix for v6.14-rc4

pick_task_scx() has a workaround to avoid stalling when the fair class's
balance() says yes but pick_task() says no. The workaround was incorrectly
deciding to keep the prev taks running if the task is on SCX even when the
task is in a sleeping state, which can lead to several confusing failure
modes. Fix it by testing the prev task is currently queued on SCX instead.

----------------------------------------------------------------
Tejun Heo (1):
      sched_ext: Fix pick_task_scx() picking non-queued tasks when it's called without balance()

 kernel/sched/ext.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

-- 
tejun