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Sat, 23 Jan 2021 08:06:59 +0000 From: Dongli Zhang To: virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v2 1/1] vhost scsi: alloc vhost_scsi with kvzalloc() to avoid delay Date: Sat, 23 Jan 2021 00:08:53 -0800 Message-Id: <20210123080853.4214-1-dongli.zhang@oracle.com> X-Mailer: git-send-email 2.17.1 X-Originating-IP: [138.3.200.16] X-ClientProxiedBy: BY5PR03CA0012.namprd03.prod.outlook.com (2603:10b6:a03:1e0::22) To BYAPR10MB2663.namprd10.prod.outlook.com (2603:10b6:a02:a9::20) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (138.3.200.16) by BY5PR03CA0012.namprd03.prod.outlook.com (2603:10b6:a03:1e0::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3784.12 via Frontend Transport; Sat, 23 Jan 2021 08:06:59 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a1e8f6f0-e7e0-4900-f053-08d8bf75dc0e X-MS-TrafficTypeDiagnostic: BYAPR10MB3445: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:635; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" The size of 'struct vhost_scsi' is order-10 (~2.3MB). It may take long time delay by kzalloc() to compact memory pages by retrying multiple times when there is a lack of high-order pages. As a result, there is latency to create a VM (with vhost-scsi) or to hotadd vhost-scsi-based storage. The prior commit 595cb754983d ("vhost/scsi: use vmalloc for order-10 allocation") prefers to fallback only when really needed, while this patch allocates with kvzalloc() with __GFP_NORETRY implicitly set to avoid retrying memory pages compact for multiple times. The __GFP_NORETRY is implicitly set if the size to allocate is more than PAGE_SZIE and when __GFP_RETRY_MAYFAIL is not explicitly set. Cc: Aruna Ramakrishna Cc: Joe Jin Signed-off-by: Dongli Zhang --- Changed since v1: - To combine kzalloc() and vzalloc() as kvzalloc() (suggested by Jason Wang) drivers/vhost/scsi.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 4ce9f00ae10e..5de21ad4bd05 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -1814,12 +1814,9 @@ static int vhost_scsi_open(struct inode *inode, struct file *f) struct vhost_virtqueue **vqs; int r = -ENOMEM, i; - vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL); - if (!vs) { - vs = vzalloc(sizeof(*vs)); - if (!vs) - goto err_vs; - } + vs = kvzalloc(sizeof(*vs), GFP_KERNEL); + if (!vs) + goto err_vs; vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL); if (!vqs) -- 2.17.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization