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b=egnIImWAjekWM0hyh5G7FSbHakblC40grDwPP0aXTYu/nLY3GNOU4WJwFVBI8QzvF NpjLHTmr9QdDTg1pR3ejvqLf0NPsYbOGW74VEYYtfiVp1V4h5V1UWYu2nv+z0z5J0w XNAm20w1ucPg26aUEcjVxU0L20wNDXViVjPkoOnaBoKziKP6ZSZ2b3VZ6P8J5DUegw iaItZCo24oMkV/NtY1OO1xYeBqmQ1WpUgas+y4ly2QnGzsX6NkWIjxmHBb18fgDIZJ GwoTUKeNPa0trKdMm9oyPvukyGBv5Cc81mEQ7X9+0umyyPbdlGhBhH/RNCjSk54t8P qQPvI4ATQTkFQ== From: "Vlastimil Babka (SUSE)" Date: Mon, 20 Jul 2026 16:16:25 +0200 Subject: [PATCH v2 11/13] mm/slab: reduce slabobj_ext memory with allocation profiling disabled MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260720-b4-objext_split-v2-11-2fa7c6f60dbe@kernel.org> References: <20260720-b4-objext_split-v2-0-2fa7c6f60dbe@kernel.org> In-Reply-To: <20260720-b4-objext_split-v2-0-2fa7c6f60dbe@kernel.org> To: Harry Yoo , Suren Baghdasaryan Cc: Hao Li , Shakeel Butt , Alexander Potapenko , Marco Elver , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, "Vlastimil Babka (SUSE)" X-Mailer: b4 0.15.2 X-Rspamd-Queue-Id: 3C31F2000F X-Stat-Signature: o9cqiapgx1qbbjxekowkkag4qk57rehn X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1784557023-873743 X-HE-Meta: U2FsdGVkX1/izVnCyjDRphMXjMi6pVkpncJRYOZ3r1f0teEs241t2A8LJyR4oYmHBpgPQVV5m5RL3qe7TU7uzg4chgofIRFIpYkSc+11pQHlAZPhEsTvc1vqdfHaDxwLoQUA50sEVRJZj7LMIJXTt9V4L+hy2DoO8Qe59JHSmrygEZzOnCio5yHjMqBQZrVMuvzNOiPz6zuSv4xP86l3PXAR3nlLhC32gPfmzwURZk1eVnsKC1iNknESIvWBuCqy8bKeHvxz43PqJZkVo3mASYaLjCQYFmBDmYussTjXpAOSYF/H7n656c8Ora50Fwx57ib9m+xAXy9tKDKsEp+CkMIm7Gv3aLPQ6NHNf1Bk7jqCj6+AmdsL1GEhxW4oWGo8n1TumnjtZdRjYafHjKTVmr7i4kXKFJg+qWIRKUKJgXgflK8tljDIleQu/C86TxSkGlZ7ldu2cvl9lQsGVVwhZjDcglJpxNo9RfBfU8NDnvZpMcMbtJePkMdet8BAFC032lESyPiWN7lVMsIl2l5FEXYFknIt2rTTrLMnNcEfECeff1tPZiG9HsMVReOolXTubVzbHpVAzQHvYOUEcpbH4DbnUqudHvaUpd6Ah+/OAC9d+5eD29atXcQvUgo6u8W9BzaJ0IVoTz7rL5/zRptd9uNTyaMdb8dosXv/cmLj+QGTlLh5e5eywbJ/QiRaXoAdCJuu7E7O6d6tGg+7V3OrDNVgc8IAYprOW5wYtswEaaA8QHbvMBG6eBXoB0D9maCrX40isvaBLa2WiErl4Q/VPF6OhMl6P5LSTEwBBzIzXAt0Q3jj/0bff02FMcm/+oQNs6eFGQblcqodz51po3zQ8nril0xDyBHXG9WAX1r8g0VDkpsKOouTjCBsKns0CylI1nnzGbQw6aRnYh97Qom5Y6NEt17pFs8VnLFpz6fZvIKSbaamiN89ffp6jLhWutCBLjiLEcNvHNKF1+SiNKb VsD+qpf2 9soakD39PxHDCXklpzvbGIeJdQ4c/1nGyPMKUbBAmPHq6l4wTT7FCSuVooSpJrrksoiUE3eyTbyKv2wuvr0cldvM3Q92KpxnSK5HiCEklF3vnZT8WDrzUWGHMuEttWvFOweq5ZrjIX+/E3w8X/OWxOJH03Mm6AepgmDAHkWaCEtKaX7IkAr0k4aYF+BZRbDuuK0XyhICYNVUoKQ8X3NG0xDxZiZUovuP8qas8vM9mD2Pv5adbBGXzL+qsSwFNGY+daHmj0cN/w9Jh9A5Ny4k6T05WCg8gWgIuDtD3M0KI9EQEGEphKkEw0qDqpw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. Reviewed-by: Suren Baghdasaryan Signed-off-by: Vlastimil Babka (SUSE) --- mm/slab.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slab.h b/mm/slab.h index 983cb1119a76..c5f37a46434e 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -591,7 +591,7 @@ static inline size_t cache_obj_ext_size(struct kmem_cache *s) 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