diff options
Diffstat (limited to 'debian/patches-rt/0189-mm-Allow-only-SLUB-on-RT.patch')
| -rw-r--r-- | debian/patches-rt/0189-mm-Allow-only-SLUB-on-RT.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/debian/patches-rt/0189-mm-Allow-only-SLUB-on-RT.patch b/debian/patches-rt/0189-mm-Allow-only-SLUB-on-RT.patch new file mode 100644 index 000000000..9fc3d7351 --- /dev/null +++ b/debian/patches-rt/0189-mm-Allow-only-SLUB-on-RT.patch @@ -0,0 +1,47 @@ +From 1da220d86ade67051c7c89743d6d037902c3839d 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-5.10.204-rt100.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 9807c66b24bb..df8d0d0f800f 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 +-- +2.43.0 + |