From nobody Tue Feb 10 20:47:04 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF19D37BE78; Mon, 9 Feb 2026 14:39:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770647981; cv=none; b=Q7vaplIsI7LV1R2BL6THV+PHeBE72a5ZgAe56hMX5IiGF+YrVPUfKt0DA0/7OcTEvk6D5r2L/yPkr31csqZy2awFuj2BwE73aXQYpOA0sLddCDcODVjbYyL/5NuuR4bb4WOYy06g4j9/DVFw76oBwsyMwxWJeWcT6EkOSKajAS0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770647981; c=relaxed/simple; bh=VslDN1mPgFIPh4fOyBZhDN58qjpQH9gwwiiN+krVdpc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Ga0olbyWDmbrE25PO+c3WZrZ7sXsyvEbG3VYXkPgoC6PVcc9rN0aEyOxIYD4dXzJd/WxbMgWQMSW709YevUdYKDDSHt2xLjZpE1ZK4TJAPF9gg82GP6FbBM8LsgBHGVyKxp53mh/DmeKs2eT/Onz51lY8BA2H/Y5HclCRivaOE8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i41dtz0x; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="i41dtz0x" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ECDF3C19425; Mon, 9 Feb 2026 14:39:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770647981; bh=VslDN1mPgFIPh4fOyBZhDN58qjpQH9gwwiiN+krVdpc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=i41dtz0xskrUok+uzr6C0WdKfzIZ4fXVrLBlLxCOk6zIViA9IMUrZWbY4l1jTHyiH 8q39lKA1o3D7s+vHLG0Y0d55CSJg07xGLYt2EcioMSRA26dHW4F2IpGpyZF3YbfTJ4 IatdZL1SyBG9AcRmkDKbpQ4Vk1r5jImqLCmctbbD/RjqXMg/ZALLuDtp9oXJ+/ET8B diWzf5VRTxiBdln3n3NORvW5jFAxjCw9DzAj5uhdNlAh8GPJ8VQ2TFstZ4QbYZ72LL 8n1pq7Sd4Tu4Ru6x8Lqf+X3j6sD6mG11ePNDnEAZAYar+jyK0vGujiBqYt/t9d4En0 77w3TEOXo83XQ== From: Andreas Hindborg Date: Mon, 09 Feb 2026 15:38:16 +0100 Subject: [PATCH v3 11/12] xarray, radix-tree: enable sheaf support for kmem_cache Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260209-xarray-entry-send-v3-11-f777c65b8ae2@kernel.org> References: <20260209-xarray-entry-send-v3-0-f777c65b8ae2@kernel.org> In-Reply-To: <20260209-xarray-entry-send-v3-0-f777c65b8ae2@kernel.org> To: Tamir Duberstein , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Alice Ryhl , Trevor Gross , Danilo Krummrich , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo Cc: Daniel Gomez , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andreas Hindborg , "Matthew Wilcox (Oracle)" X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1243; i=a.hindborg@kernel.org; h=from:subject:message-id; bh=VslDN1mPgFIPh4fOyBZhDN58qjpQH9gwwiiN+krVdpc=; b=owEBbQKS/ZANAwAKAeG4Gj55KGN3AcsmYgBpifFex2+rby13jaJSZme2/vU05ZzvMRP5UT6SK VJQYMHYp8qJAjMEAAEKAB0WIQQSwflHVr98KhXWwBLhuBo+eShjdwUCaYnxXgAKCRDhuBo+eShj d7xHD/48WEALFQfX+iMYXsiR/Mvn723D+YBjt2TOR/yfD7Sul4d8Iv02lIm3LGfCJsyUqsx0R/m Qk2ZkCueXt8bvCuSssHdX0jFMrBRDz9DFgMbk5SHMC2hLN/W0x/AY4rHDH4HxWqA/09V2h9kX9l by7veoXmADET0BEbdp15OIZLrP4+TbK6Md7Y98gcZZZZgKfyOgrWD9O+wZSe1jT4JSNrdw0pHhK WEiy/1R+bNnLAmMOP7AjVxTRKZ5SQafFzXZwe1+F6+mZe2saG8I5hrDR+VxNKisA7vQl9/z3gF1 XuYWSv6bLte0vcgMNpzi5111T1Tky95jqKotdLtHq7sO+hUg0IAm1sGAzEr848kitJXmQWyyp8z RtkHcd0kwQ/15cx2EZjuMGm32TRs79hH6cCTfvmf4CweWaQmqV+mC5uohtBCP7piEWMy/RrA1lx Lk8TicZ76wcecqeZ8TeDdarQAI/oVX1NO6bP4HKm3wcdjn2HDq2AW5m3Ss2RyH1ZoffhLt7eyAY HG8F4YbEif5r2ab7bGc75ROxcp9b9NTzghH7dtSdy8YrkyjeZNU9Uc1uq1KyyHMibe/jKSjYmPP debQlj5Vy7aICDbaFtI+SvG1jp8hcOSvnmatndAdy79kxiL25JYhXQRUaqy4lc6Xcs8Um0+KbQA EVG3kWV3B6ysnbw== X-Developer-Key: i=a.hindborg@kernel.org; a=openpgp; fpr=3108C10F46872E248D1FB221376EB100563EF7A7 The rust null block driver plans to rely on preloading xarray nodes from the radix_tree_node_cachep kmem_cache. Cc: "Matthew Wilcox (Oracle)" Signed-off-by: Andreas Hindborg --- lib/radix-tree.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 976b9bd02a1b5..1cf0012b15ade 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -1598,10 +1598,16 @@ void __init radix_tree_init(void) BUILD_BUG_ON(RADIX_TREE_MAX_TAGS + __GFP_BITS_SHIFT > 32); BUILD_BUG_ON(ROOT_IS_IDR & ~GFP_ZONEMASK); BUILD_BUG_ON(XA_CHUNK_SIZE > 255); - radix_tree_node_cachep =3D kmem_cache_create("radix_tree_node", - sizeof(struct radix_tree_node), 0, - SLAB_PANIC | SLAB_RECLAIM_ACCOUNT, - radix_tree_node_ctor); + + struct kmem_cache_args args =3D { + .ctor =3D radix_tree_node_ctor, + .sheaf_capacity =3D 64, + }; + + radix_tree_node_cachep =3D kmem_cache_create( + "radix_tree_node", sizeof(struct radix_tree_node), &args, + SLAB_PANIC | SLAB_RECLAIM_ACCOUNT); + ret =3D cpuhp_setup_state_nocalls(CPUHP_RADIX_DEAD, "lib/radix:dead", NULL, radix_tree_cpu_dead); WARN_ON(ret < 0); --=20 2.51.2