From nobody Sun Feb 8 12:19:34 2026 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C9E2119E819 for ; Tue, 15 Apr 2025 17:20:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744737655; cv=none; b=stI9RKD5JhID9CYzfYAOUwKIcYZlVDaEYszUnP5Q2GoFEgLMJcJyP+9s7uBCIryvpisQhwqrGy6Uz+qkzt9BYPylnsD8PzW8WRlG8qylxpci/+7tXvUQQLAbgqccrZkDeJG7m3sO/K9HakCHVJlweGO+kiwELz2PLNdxd6Muvag= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744737655; c=relaxed/simple; bh=/IJKFtHh06K+r6fw9+YnmvZdUdj2qCNjcOk8l8INVIQ=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=EegZYT4P5g1FRmSHYQSWfgO6fgV+bfGChQPUqjY5oeHEIvBhqUOyqVFjpX0u7IoHHELd5a04dcpnRwXldUcMZM0vxBfTk04IgtE+D703niwTKTlyyjsdSJAWgJJkbr9u0wSNVv2ZIEphOr7RqtZCk6IINkVWb4ex9B+XGmeOq2I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=wFiFHoyO; arc=none smtp.client-ip=209.85.210.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="wFiFHoyO" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-7395d07a3dcso4240267b3a.3 for ; Tue, 15 Apr 2025 10:20:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744737653; x=1745342453; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=ZZKTzytUJ5gvm1rD+Ux7dnbHm6H7yF/Qpc+vR+tifvc=; b=wFiFHoyONavQQMToHC1E4DwlCsuPNLvHmGUWEH+zVeVDAycz0PUwvCe3nAAi2PgUdZ 7bFqqzJLQwcsKtyOMZr2sVmLcmJxzpjO62HaO0dlttfHnelUwqCh3XmBIqszxgKxZdyf XHu1hUsWjuZ1FO21xSBNi2ii88P9uKGqTwiyprQlYsA2IUG2vEo+ZS7VqOA0awC8l8yb G4QmJyj6Y8WPP/i17EI/r6dsxAk3jjQQZlYOj+oRl6JpQd9ma3cOhVPLfokpplQFvBSt qMpiV0wGFbkrl9Is0nMD9tDSzMXG9/OMbXJ2BCIOsEMJf5oHQCWf5j1+nRosJbDmLwPA tUWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744737653; x=1745342453; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ZZKTzytUJ5gvm1rD+Ux7dnbHm6H7yF/Qpc+vR+tifvc=; b=hVmdIzJTKpmz81CZ5K2szr7Z9qwzZKsREdwZ3m0hYxkAjBS9IO1EowBsDB642XRVnH UEyBLONZZ7ICJHdykxkjgAKhFztIMqISeHlmAMIcewMrCOJZX7lZWyQKrwLPZUNhnI3j 8lbW4JIQhrbs8M4z3Q08v85jzFwJDrKqnB9UumAz8fLxpzfJcUz2M5oPz5UwuBIJkDd5 kMbBML9v7JVcULX/W802q6uOS9w1w+kx68yCY9ngQHFUgulTGJkGhL7skxmG388JvFG4 8DK6UfijcquLR2k4MaP/vZkuxTxC323N09MgTGl4ZTlHfRlZuadbbLdxABQQ8//nxKU3 85Pw== X-Forwarded-Encrypted: i=1; AJvYcCU7ASz6vdHBJozNjoNc6OlqA1y7x0BLmnzRhGH1+CPW/XI747JsMgoT0NxEwAurZ20mknbCF2tsSsQ/9QU=@vger.kernel.org X-Gm-Message-State: AOJu0Ywigt5YyTcn4mqEip+x7DkE8cvlTCDRNap9TjkvgONT9Ws6tUo0 K80Jk8T69lDuoHVjWR9YEgWNJ9xDsxXcHqxYUrBIWQM779Pje5Hk52R4lG5DINFtxJyACQg5hLX ZYVrw5A== X-Google-Smtp-Source: AGHT+IEtqmOWyc2b0VefNP8+RxTxYVwyvsPccMVCWFhQFWDyZ1nHgtQ/5h+wSOOn5ob1foG8cOMdK2s8JDAm X-Received: from pfbga15.prod.google.com ([2002:a05:6a00:620f:b0:732:2279:bc82]) (user=jyescas job=prod-delivery.src-stubby-dispatcher) by 2002:aa7:9308:0:b0:736:34ca:dee2 with SMTP id d2e1a72fcca58-73c1f8c6b5emr422992b3a.4.1744737653056; Tue, 15 Apr 2025 10:20:53 -0700 (PDT) Date: Tue, 15 Apr 2025 10:19:53 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.49.0.604.gff1f9ca942-goog Message-ID: <20250415171954.3970818-1-jyescas@google.com> Subject: [PATCH] dma-buf: heaps: Set allocation orders for larger page sizes From: Juan Yescas To: Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , "=?UTF-8?q?Christian=20K=C3=B6nig?=" , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Cc: jyescas@google.com, baohua@kernel.org, dmitry.osipenko@collabora.com, jaewon31.kim@samsung.com, Guangming.Cao@mediatek.com, surenb@google.com, kaleshsingh@google.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This change sets the allocation orders for the different page sizes (4k, 16k, 64k) based on PAGE_SHIFT. Before this change, the orders for large page sizes were calculated incorrectly, this caused system heap to allocate from 2% to 4% more memory on 16KiB page size kernels. This change was tested on 4k/16k page size kernels. Signed-off-by: Juan Yescas Acked-by: John Stultz Reviewed-by: T.J. Mercier --- drivers/dma-buf/heaps/system_heap.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/sy= stem_heap.c index 26d5dc89ea16..54674c02dcb4 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -50,8 +50,15 @@ static gfp_t order_flags[] =3D {HIGH_ORDER_GFP, HIGH_ORD= ER_GFP, LOW_ORDER_GFP}; * to match with the sizes often found in IOMMUs. Using order 4 pages inst= ead * of order 0 pages can significantly improve the performance of many IOMM= Us * by reducing TLB pressure and time spent updating page tables. + * + * Note: When the order is 0, the minimum allocation is PAGE_SIZE. The pos= sible + * page sizes for ARM devices could be 4K, 16K and 64K. */ -static const unsigned int orders[] =3D {8, 4, 0}; +#define ORDER_1M (20 - PAGE_SHIFT) +#define ORDER_64K (16 - PAGE_SHIFT) +#define ORDER_FOR_PAGE_SIZE (0) +static const unsigned int orders[] =3D {ORDER_1M, ORDER_64K, ORDER_FOR_PAG= E_SIZE}; + #define NUM_ORDERS ARRAY_SIZE(orders) =20 static struct sg_table *dup_sg_table(struct sg_table *table) --=20 2.49.0.604.gff1f9ca942-goog