From nobody Tue Nov 18 07:26:45 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1608170025; cv=none; d=zohomail.com; s=zohoarc; b=KtMEa4jluPCnCx35XMc1xgFGXr0aVUJlZuuCTgvowpVdKWpV1qQJVQezCFnhh+PABfaDzOQRRf1C5x2NTFwiHg0m8wLOKngzHILQQsYIxBX87bN5UMx2IOdPYzOMWT98n48ra/zRTIbJV77OqyzPrg8Oe6sb5R0kW7i5HAALvq8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1608170025; h=Content-Type:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=BWfGsTzK5rKjlWuJUWUeqJYinUxptHD90QJQY93bstQ=; b=UBahhSjg7BlCYKf9KSXzO1S7aQ8I3nzNDc2MUAxHnapxYu/vAz8aLd61bGy6JgVL+wTk41hacD5yA6j7VhvnLyprXaHlHRtmGRM8R5QGOITesEkW8m7+/swTbonVaanJuq7GIvoJ+EXOnz/1T3Az8Dc7Uq0I/YUMNO2ewBo5fOo= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1608170025673987.6815152941284; Wed, 16 Dec 2020 17:53:45 -0800 (PST) Received: from localhost ([::1]:53252 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kpiUC-0003YH-L4 for importer@patchew.org; Wed, 16 Dec 2020 20:53:44 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51796) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kpiR8-0000yD-Hd; Wed, 16 Dec 2020 20:50:34 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:2608) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kpiR5-0005tD-E3; Wed, 16 Dec 2020 20:50:34 -0500 Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4CxFKz3sWmz7FlN; Thu, 17 Dec 2020 09:49:43 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.174.187.37) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.498.0; Thu, 17 Dec 2020 09:50:14 +0800 From: Keqian Zhu To: Peter Maydell , Paolo Bonzini , "Dr . David Alan Gilbert" , Andrew Jones , Peter Xu Subject: [PATCH v2 1/2] accel: kvm: Fix memory waste under mismatch page size Date: Thu, 17 Dec 2020 09:49:40 +0800 Message-ID: <20201217014941.22872-2-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20201217014941.22872-1-zhukeqian1@huawei.com> References: <20201217014941.22872-1-zhukeqian1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.187.37] X-CFilter-Loop: Reflected Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=45.249.212.35; envelope-from=zhukeqian1@huawei.com; helo=szxga07-in.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jiangkunkun@huawei.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, Zenghui Yu , wanghaibin.wang@huawei.com, Keqian Zhu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When handle dirty log, we face qemu_real_host_page_size and TARGET_PAGE_SIZE. The first one is the granule of KVM dirty bitmap, and the second one is the granule of QEMU dirty bitmap. As qemu_real_host_page_size >=3D TARGET_PAGE_SIZE (kvm_init() enforced it), misuse TARGET_PAGE_SIZE to init kvmslot dirty_bmap may waste memory. For example, when qemu_real_host_page_size is 64K and TARGET_PAGE_SIZE is 4K, it wastes 93.75% (15/16) memory. Signed-off-by: Keqian Zhu Reviewed-by: Andrew Jones Reviewed-by: Peter Xu --- accel/kvm/kvm-all.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- v2 - Address Andrew's comment (qemu_real_host_page_size >=3D TARGET_PAGE_SIZE is a rule). - Add Andrew and Peter's R-b. diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 389eaace72..f6b16a8df8 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -620,8 +620,12 @@ static void kvm_memslot_init_dirty_bitmap(KVMSlot *mem) * too, in most cases). * So for now, let's align to 64 instead of HOST_LONG_BITS here, in * a hope that sizeof(long) won't become >8 any time soon. + * + * Note: the granule of kvm dirty log is qemu_real_host_page_size. + * And mem->memory_size is aligned to it (otherwise this mem can't + * be registered to KVM). */ - hwaddr bitmap_size =3D ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS), + hwaddr bitmap_size =3D ALIGN(mem->memory_size / qemu_real_host_page_si= ze, /*HOST_LONG_BITS*/ 64) / 8; mem->dirty_bmap =3D g_malloc0(bitmap_size); } --=20 2.23.0