mm, slub: use migrate_disable() on PREEMPT_RT

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We currently use preempt_disable() (directly or via get_cpu_ptr()) to stabilize
the pointer to kmem_cache_cpu. On PREEMPT_RT this would be incompatible with
the list_lock spinlock. We can use migrate_disable() instead, but that
increases overhead on !PREEMPT_RT as it's an unconditional function call.

In order to get the best available mechanism on both PREEMPT_RT and
!PREEMPT_RT, introduce private slub_get_cpu_ptr() and slub_put_cpu_ptr()
wrappers and use them.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

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This commit is contained in:

Vlastimil Babka 2021-05-21 14:03:23 +02:00

parent e0a043aa41

commit 25c00c506e

1 changed files with 30 additions and 9 deletions

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mm/slub.c

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