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[v3,05/35] mm, slub: remove redundant unfreeze_partials() from put_cpu_partial()

Message ID 20210729132132.19691-6-vbabka@suse.cz (mailing list archive)
State New
Headers show
Series SLUB: reduce irq disabled scope and make it RT compatible | expand

Commit Message

Vlastimil Babka July 29, 2021, 1:21 p.m. UTC
Commit d6e0b7fa1186 ("slub: make dead caches discard free slabs immediately")
introduced cpu partial flushing for kmemcg caches, based on setting the target
cpu_partial to 0 and adding a flushing check in put_cpu_partial().
This code that sets cpu_partial to 0 was later moved by c9fc586403e7 ("slab:
introduce __kmemcg_cache_deactivate()") and ultimately removed by 9855609bde03
("mm: memcg/slab: use a single set of kmem_caches for all accounted
allocations"). However the check and flush in put_cpu_partial() was never
removed, although it's effectively a dead code. So this patch removes it.

Note that d6e0b7fa1186 also added preempt_disable()/enable() to
unfreeze_partials() which could be thus also considered unnecessary. But
further patches will rely on it, so keep it.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
 mm/slub.c | 7 -------
 1 file changed, 7 deletions(-)
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diff --git a/mm/slub.c b/mm/slub.c
index 0f08b64e2fd1..15f01d2ca30f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2463,13 +2463,6 @@  static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
 	} while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page)
 								!= oldpage);
-	if (unlikely(!slub_cpu_partial(s))) {
-		unsigned long flags;
-		local_irq_save(flags);
-		unfreeze_partials(s, this_cpu_ptr(s->cpu_slab));
-		local_irq_restore(flags);
-	}