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41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
From: Ingo Molnar <mingo@elte.hu>
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Date: Fri, 3 Jul 2009 08:44:03 -0500
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Subject: mm: Allow only SLUB on RT
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Memory allocation disables interrupts as part of the allocation and freeing
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process. For -RT it is important that this section remain short and don't
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depend on the size of the request or an internal state of the memory allocator.
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At the beginning the SLAB memory allocator was adopted for RT's needs and it
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required substantial changes. Later, with the addition of the SLUB memory
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allocator we adopted this one as well and the changes were smaller. More
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important, due to the design of the SLUB allocator it performs better and its
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worst case latency was smaller. In the end only SLUB remained supported.
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Disable SLAB and SLOB on -RT. Only SLUB is adopted to -RT needs.
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Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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init/Kconfig | 2 ++
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1 file changed, 2 insertions(+)
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -1895,6 +1895,7 @@ choice
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config SLAB
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bool "SLAB"
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+ depends on !PREEMPT_RT
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select HAVE_HARDENED_USERCOPY_ALLOCATOR
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help
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The regular slab allocator that is established and known to work
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@@ -1915,6 +1916,7 @@ config SLUB
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config SLOB
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depends on EXPERT
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bool "SLOB (Simple Allocator)"
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+ depends on !PREEMPT_RT
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help
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SLOB replaces the stock allocator with a drastically simpler
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allocator. SLOB is generally more space efficient but
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