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From 70adf5ebf9706c12042d4e636ac6fada7bf1ab29 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:44:03 -0500
Subject: [PATCH 189/323] mm: Allow only SLUB on RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.215-rt107.tar.xz
Memory allocation disables interrupts as part of the allocation and freeing
process. For -RT it is important that this section remain short and don't
depend on the size of the request or an internal state of the memory allocator.
At the beginning the SLAB memory allocator was adopted for RT's needs and it
required substantial changes. Later, with the addition of the SLUB memory
allocator we adopted this one as well and the changes were smaller. More
important, due to the design of the SLUB allocator it performs better and its
worst case latency was smaller. In the end only SLUB remained supported.
Disable SLAB and SLOB on -RT. Only SLUB is adopted to -RT needs.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
init/Kconfig | 2 ++
1 file changed, 2 insertions(+)
diff --git a/init/Kconfig b/init/Kconfig
index 9807c66b24bb6..df8d0d0f800f5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1922,6 +1922,7 @@ choice
config SLAB
bool "SLAB"
+ depends on !PREEMPT_RT
select HAVE_HARDENED_USERCOPY_ALLOCATOR
help
The regular slab allocator that is established and known to work
@@ -1942,6 +1943,7 @@ config SLUB
config SLOB
depends on EXPERT
bool "SLOB (Simple Allocator)"
+ depends on !PREEMPT_RT
help
SLOB replaces the stock allocator with a drastically simpler
allocator. SLOB is generally more space efficient but
--
2.44.0
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