From: "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
To: Harry Yoo <harry@kernel.org>, Suren Baghdasaryan <surenb@google.com>
Cc: Hao Li <hao.li@linux.dev>, Shakeel Butt <shakeel.butt@linux.dev>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org,
"Vlastimil Babka (SUSE)" <vbabka@kernel.org>
Subject: [PATCH RFC 10/12] mm/slab: reduce slabobj_ext memory with allocation profiling disabled
Date: Wed, 15 Jul 2026 12:10:50 +0200 [thread overview]
Message-ID: <20260715-b4-objext_split-v1-10-9a49c4ccf4c3@kernel.org> (raw)
In-Reply-To: <20260715-b4-objext_split-v1-0-9a49c4ccf4c3@kernel.org>
When memory allocation profiling is compiled in but permanently disabled
on boot with (implicit or explicit) "never" parameter, stop allocating
(wasting) memory for the codetag_ref parts of slabobj_ext metadata.
Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
---
mm/slab.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/slab.h b/mm/slab.h
index dcca86799fc9..a50347c9dbe3 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -587,7 +587,7 @@ static inline size_t static_obj_ext_size(void)
if (IS_ENABLED(CONFIG_MEMCG))
sz += 1;
- if (IS_ENABLED(CONFIG_MEM_ALLOC_PROFILING))
+ if (slab_obj_ext_has_codetag())
sz += 1;
return sizeof(struct slabobj_ext) * sz;
--
2.55.0
next prev parent reply other threads:[~2026-07-15 10:11 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-15 10:10 [PATCH RFC 00/12] mm/slab, alloc_tag: reduce obj_ext memory waste Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 01/12] mm/slab: skip kfence objects in allocation profiling Vlastimil Babka (SUSE)
2026-07-15 16:02 ` Suren Baghdasaryan
2026-07-15 10:10 ` [PATCH RFC 02/12] mm/slab: remove objs_per_slab() Vlastimil Babka (SUSE)
2026-07-15 16:13 ` Suren Baghdasaryan
2026-07-15 10:10 ` [PATCH RFC 03/12] mm: move struct slabobj_ext to mm/slab.h Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 04/12] mm/slab: make slab_obj_ext() determine object index Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 05/12] mm/slab: abstract slabobj_ext.objcg access Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 06/12] mm/slab: abstract slabobj_ext.ref access Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 07/12] mm/slab: replace slab.stride with obj_exts_in_object Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 08/12] mm/slab: change struct slabobj_ext to a union Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 09/12] mm/slab: introduce slab_obj_ext_has_codetag() Vlastimil Babka (SUSE)
2026-07-15 10:10 ` Vlastimil Babka (SUSE) [this message]
2026-07-15 10:10 ` [PATCH RFC 11/12] mm/slab: add slab_needs_objcg() helper Vlastimil Babka (SUSE)
2026-07-15 10:10 ` [PATCH RFC 12/12] mm/slab: stop allocating objcg pointers when unnecessary Vlastimil Babka (SUSE)
2026-07-15 15:32 ` [PATCH RFC 00/12] mm/slab, alloc_tag: reduce obj_ext memory waste Suren Baghdasaryan
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