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Message-ID: <20241122173557.MYOtT95Q@linutronix.de>
Date: Fri, 22 Nov 2024 18:35:57 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Cc: tglx@...utronix.de, Shrikanth Hegde <sshegde@...ux.ibm.com>,
Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Valentin Schneider <vschneid@...hat.com>
Subject: [PATCH] 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>
---
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 9cd9cd06538bf..23d9bd5ea7e47 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4818,6 +4818,11 @@
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
--
2.45.2
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