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slub: Reflow ___slab_alloc()

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[ Upstream commit 24c6a097b5 ]

The get_partial() interface used in ___slab_alloc() may return a single
object in the "kmem_cache_debug(s)" case, in which we will just return
the "freelist" object.

Move this handling up to prepare for later changes.

And the "pfmemalloc_match()" part is not needed for node partial slab,
since we already check this in the get_partial_node().

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Stable-dep-of: 850470a8413a ("mm: slub: avoid wake up kswapd in set_track_prepare")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chengming Zhou 2025-09-07 11:13:26 -04:00 committed by Greg Kroah-Hartman
parent e305ec2eac
commit da1cf8ca0c
1 changed files with 15 additions and 16 deletions
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31
mm/slub.c
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@ -3129,8 +3129,21 @@ new_objects:
pc.slab = &slab;
pc.orig_size = orig_size;
freelist = get_partial(s, node, &pc);
if (freelist)
goto check_new_slab;
if (freelist) {
if (kmem_cache_debug(s)) {
/*
* For debug caches here we had to go through
* alloc_single_from_partial() so just store the
* tracking info and return the object.
*/
if (s->flags & SLAB_STORE_USER)
set_track(s, freelist, TRACK_ALLOC, addr);
return freelist;
}
goto retry_load_slab;
}
slub_put_cpu_ptr(s->cpu_slab);
slab = new_slab(s, gfpflags, node);
@ -3166,20 +3179,6 @@ new_objects:
inc_slabs_node(s, slab_nid(slab), slab->objects);
check_new_slab:
if (kmem_cache_debug(s)) {
/*
* For debug caches here we had to go through
* alloc_single_from_partial() so just store the tracking info
* and return the object
*/
if (s->flags & SLAB_STORE_USER)
set_track(s, freelist, TRACK_ALLOC, addr);
return freelist;
}
if (unlikely(!pfmemalloc_match(slab, gfpflags))) {
/*
* For !pfmemalloc_match() case we don't load freelist so that