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[209.132.180.67]) by mx.google.com with ESMTP id r7-v6si4560892pgs.573.2018.05.17.13.55.54; Thu, 17 May 2018 13:56:08 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2017-10-26 header.b=GuZAWjZX; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752398AbeEQUyR (ORCPT + 99 others); Thu, 17 May 2018 16:54:17 -0400 Received: from aserp2130.oracle.com ([141.146.126.79]:37880 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752370AbeEQUyO (ORCPT ); Thu, 17 May 2018 16:54:14 -0400 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w4HKpQkj026687; Thu, 17 May 2018 20:54:07 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id; s=corp-2017-10-26; bh=7Qecx67eSyGzRx74Zckyk4mfZUaDdIaB/ZACzGDDErE=; b=GuZAWjZXPN+pG6NyY5VZskQ52nK/3TCSrihliMAnUJrF58uIdsuO5mEpBB2fHdxVFL/7 HdWu1Xvgq2gfA/lCn1hXKF6U//KTDhOYMMkaywpIcCnEG8QLzekqk6lM3mLW5VfNNneg 3H7l7QYgIBfy1kxkfXvR+gA2hqvUtptDlsbDxUwRqfv70o2dv74eDqBopzj2nADa6FKA cMkp7Mddz7uP91Jmrm+n6RBntsVCNujIE5jb9yHQlPKEdHPUJgWGorAI2P6ZsNuExQ49 0BqheldKScUSv3eP43pObT8VAr7Qnv3vE5oRliXpLoHloQ6q+CLJPm9dIBvZzk5dP9hW 5A== Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by aserp2130.oracle.com with ESMTP id 2hxpvd1kss-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 17 May 2018 20:54:06 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w4HKs3XL028883 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 17 May 2018 20:54:04 GMT Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id w4HKs2kn025856; Thu, 17 May 2018 20:54:03 GMT Received: from qing-ol6-work.us.oracle.com (/10.132.91.100) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 17 May 2018 13:54:02 -0700 From: Qing Huang To: tariqt@mellanox.com, davem@davemloft.net, haakon.bugge@oracle.com, yanjun.zhu@oracle.com Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, gi-oh.kim@profitbricks.com, Qing Huang Subject: [PATCH v3] mlx4_core: allocate ICM memory in page size chunks Date: Thu, 17 May 2018 13:53:43 -0700 Message-Id: <20180517205343.8401-1-qing.huang@oracle.com> X-Mailer: git-send-email 2.9.3 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8896 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=935 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1805170193 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When a system is under memory presure (high usage with fragments), the original 256KB ICM chunk allocations will likely trigger kernel memory management to enter slow path doing memory compact/migration ops in order to complete high order memory allocations. When that happens, user processes calling uverb APIs may get stuck for more than 120s easily even though there are a lot of free pages in smaller chunks available in the system. Syslog: ... Dec 10 09:04:51 slcc03db02 kernel: [397078.572732] INFO: task oracle_205573_e:205573 blocked for more than 120 seconds. ... With 4KB ICM chunk size on x86_64 arch, the above issue is fixed. However in order to support smaller ICM chunk size, we need to fix another issue in large size kcalloc allocations. E.g. Setting log_num_mtt=30 requires 1G mtt entries. With the 4KB ICM chunk size, each ICM chunk can only hold 512 mtt entries (8 bytes for each mtt entry). So we need a 16MB allocation for a table->icm pointer array to hold 2M pointers which can easily cause kcalloc to fail. The solution is to use vzalloc to replace kcalloc. There is no need for contiguous memory pages for a driver meta data structure (no need of DMA ops). Signed-off-by: Qing Huang Acked-by: Daniel Jurgens Reviewed-by: Zhu Yanjun --- v3: use PAGE_SIZE instead of PAGE_SHIFT add comma to the end of enum variables include vmalloc.h header file to avoid build issues on Sparc v2: adjuste chunk size to reflect different architectures drivers/net/ethernet/mellanox/mlx4/icm.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/icm.c b/drivers/net/ethernet/mellanox/mlx4/icm.c index a822f7a..3705f4e 100644 --- a/drivers/net/ethernet/mellanox/mlx4/icm.c +++ b/drivers/net/ethernet/mellanox/mlx4/icm.c @@ -33,6 +33,7 @@ #include #include +#include #include #include @@ -43,12 +44,12 @@ #include "fw.h" /* - * We allocate in as big chunks as we can, up to a maximum of 256 KB - * per chunk. + * We allocate in page size (default 4KB on many archs) chunks to avoid high + * order memory allocations in fragmented/high usage memory situation. */ enum { - MLX4_ICM_ALLOC_SIZE = 1 << 18, - MLX4_TABLE_CHUNK_SIZE = 1 << 18 + MLX4_ICM_ALLOC_SIZE = PAGE_SIZE, + MLX4_TABLE_CHUNK_SIZE = PAGE_SIZE, }; static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk) @@ -400,7 +401,7 @@ int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table, obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size; num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk; - table->icm = kcalloc(num_icm, sizeof(*table->icm), GFP_KERNEL); + table->icm = vzalloc(num_icm * sizeof(*table->icm)); if (!table->icm) return -ENOMEM; table->virt = virt; @@ -446,7 +447,7 @@ int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table, mlx4_free_icm(dev, table->icm[i], use_coherent); } - kfree(table->icm); + vfree(table->icm); return -ENOMEM; } @@ -462,5 +463,5 @@ void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table) mlx4_free_icm(dev, table->icm[i], table->coherent); } - kfree(table->icm); + vfree(table->icm); } -- 2.9.3