The patch titled
Subject: mm: allow only SLUB on PREEMPT_RT
has been added to the -mm tree. Its filename is
mm-allow-only-slub-on-preempt_rt.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-allow-only-slub-on-preempt_rt.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-allow-only-slub-on-preempt_rt.patch
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------------------------------------------------------
From: Ingo Molnar <mingo@xxxxxxxxxx>
Subject: mm: allow only SLUB on PREEMPT_RT
Memory allocators may disable interrupts or preemption as part of the
allocation and freeing process. For PREEMPT_RT it is important that these
sections remain deterministic and short and therefore don't depend on the
size of the memory to allocate/ free or the inner state of the algorithm.
Until v3.12-RT the SLAB allocator was an option but involved several
changes to meet all the requirements. The SLUB design fits better with
PREEMPT_RT model and so the SLAB patches were dropped in the 3.12-RT
patchset. Comparing the two allocator, SLUB outperformed SLAB in both
throughput (time needed to allocate and free memory) and the maximal
latency of the system measured with cyclictest during hackbench.
SLOB was never evaluated since it was unlikely that it preforms better
than SLAB. During a quick test, the kernel crashed with SLOB enabled
during boot.
Disable SLAB and SLOB on PREEMPT_RT.
[bigeasy@xxxxxxxxxxxxx: commit description]
Link: https://lkml.kernel.org/r/20211015210336.gen3tib33ig5q2md@xxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
init/Kconfig | 2 ++
1 file changed, 2 insertions(+)
--- a/init/Kconfig~mm-allow-only-slub-on-preempt_rt
+++ a/init/Kconfig
@@ -1905,6 +1905,7 @@ 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
@@ -1925,6 +1926,7 @@ 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
_
Patches currently in -mm which might be from mingo@xxxxxxxxxx are
mm-allow-only-slub-on-preempt_rt.patch
