linux-kernel - [tip: sched/core] sched/core: Update kernel boot parameters for LAZY preempt.

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Message-ID: <173313808754.412.8236870383786854735.tip-bot2@tip-bot2>
Date: Mon, 02 Dec 2024 11:14:47 -0000
From: "tip-bot2 for Sebastian Andrzej Siewior" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Shrikanth Hegde <sshegde@...ux.ibm.com>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: sched/core] sched/core: Update kernel boot parameters for LAZY preempt.

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     f66e4a996582d59b6f5ce88078b0ad2a328aa532
Gitweb:        https://git.kernel.org/tip/f66e4a996582d59b6f5ce88078b0ad2a328aa532
Author:        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate:    Fri, 22 Nov 2024 18:35:57 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 02 Dec 2024 12:01:28 +01:00

sched/core: Update kernel boot parameters for LAZY preempt.

Update the documentation for the `preempt=' parameter which now also
accepts `lazy'.

Fixes: 7c70cb94d29cd ("sched: Add Lazy preemption model")
Reported-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
Link: https://lore.kernel.org/r/20241122173557.MYOtT95Q@linutronix.de
---
 Documentation/admin-guide/kernel-parameters.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index dc663c0..3872bc6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4822,6 +4822,11 @@
 			       can be preempted anytime.  Tasks will also yield
 			       contended spinlocks (if the critical section isn't
 			       explicitly preempt disabled beyond the lock itself).
+			lazy - Scheduler controlled. Similar to full but instead
+			       of preempting the task immediately, the task gets
+			       one HZ tick time to yield itself before the
+			       preemption will be forced. One preemption is when the
+			       task returns to user space.

 	print-fatal-signals=
 			[KNL] debug: print fatal signals