From patchwork Thu Mar 28 13:38:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunsheng Lin X-Patchwork-Id: 13608538 Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) (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 40ED739FC5; Thu, 28 Mar 2024 13:40:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.35 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711633243; cv=none; b=Qe/CxG35pRmglu3wDyCVbNpzFKklU5p3/ocWKSCU3d6NjSVW4VqeRb79kx/zyP2iMbiTIZgNLWu9ckf+ow1MzY0KgqauruvYnnEtpbP8JUSgBH/ETfOaGMRmAbfvF3mHNsyqxm1qJiRbQvHaSqeGkwPG2fn9UEiVgAzl2f0sD+g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711633243; c=relaxed/simple; bh=y/oraJ5CGRMf0aDMagJKBOG+7nPO1Z4eZNfOqBzfZ8w=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=GlLbzqMjfKbRNaIdHAKZ5D9M1yQagQjOIJwDOXW73kOJGrtfcI0SRnJrxR6eKywCI4jaV9iKYNfSUOYssDUlGk1po/US95/LWxMH3ob3hA0Cx0erptXHYP2sPT0lHw/KJokGgmxoa7WRYiFV3SR7ve5viO2NV8t3AVDIYBnaShk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.35 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.44]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4V54Ng4jTvz1R88n; Thu, 28 Mar 2024 21:37:55 +0800 (CST) Received: from dggpemm500005.china.huawei.com (unknown [7.185.36.74]) by mail.maildlp.com (Postfix) with ESMTPS id 83CC11402CA; Thu, 28 Mar 2024 21:40:36 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by dggpemm500005.china.huawei.com (7.185.36.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Thu, 28 Mar 2024 21:40:36 +0800 From: Yunsheng Lin To: , , CC: , , Yunsheng Lin , Alexander Duyck , Matthias Brugger , AngeloGioacchino Del Regno , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , , , Subject: [PATCH RFC 00/10] First try to replace page_frag with page_frag_cache Date: Thu, 28 Mar 2024 21:38:29 +0800 Message-ID: <20240328133839.13620-1-linyunsheng@huawei.com> X-Mailer: git-send-email 2.33.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500005.china.huawei.com (7.185.36.74) X-Patchwork-State: RFC After [1], Only there are two implementations for page frag: 1. mm/page_alloc.c: net stack seems to be using it in the rx part with 'struct page_frag_cache' and the main API being page_frag_alloc_align(). 2. net/core/sock.c: net stack seems to be using it in the tx part with 'struct page_frag' and the main API being skb_page_frag_refill(). This patchset tries to unfiy the page frag implementation by replacing page_frag with page_frag_cache for sk_page_frag() first. And will try to replace the rest of page_frag in the follow patchset. After this patchset, we are not only able to unify the page frag implementation a little, but seems able to have about 0.5% performance boost testing by using the vhost_net_test introduced in [1] too. Before this patch: Performance counter stats for './vhost_net_test' (10 runs): 603027.29 msec task-clock # 1.756 CPUs utilized ( +- 0.04% ) 2097713 context-switches # 3.479 K/sec ( +- 0.00% ) 212 cpu-migrations # 0.352 /sec ( +- 4.72% ) 40 page-faults # 0.066 /sec ( +- 1.18% ) 467215266413 cycles # 0.775 GHz ( +- 0.12% ) (66.02%) 131736729037 stalled-cycles-frontend # 28.20% frontend cycles idle ( +- 2.38% ) (64.34%) 77728393294 stalled-cycles-backend # 16.64% backend cycles idle ( +- 3.98% ) (65.42%) 345874254764 instructions # 0.74 insn per cycle # 0.38 stalled cycles per insn ( +- 0.75% ) (70.28%) 105166217892 branches # 174.397 M/sec ( +- 0.65% ) (68.56%) 9649321070 branch-misses # 9.18% of all branches ( +- 0.69% ) (65.38%) 343.376 +- 0.147 seconds time elapsed ( +- 0.04% ) After this patch: Performance counter stats for './vhost_net_test' (10 runs): 598081.02 msec task-clock # 1.752 CPUs utilized ( +- 0.11% ) 2097738 context-switches # 3.507 K/sec ( +- 0.00% ) 220 cpu-migrations # 0.368 /sec ( +- 6.58% ) 40 page-faults # 0.067 /sec ( +- 0.92% ) 469788205101 cycles # 0.785 GHz ( +- 0.27% ) (64.86%) 137108509582 stalled-cycles-frontend # 29.19% frontend cycles idle ( +- 0.96% ) (63.62%) 75499065401 stalled-cycles-backend # 16.07% backend cycles idle ( +- 1.04% ) (65.86%) 345469451681 instructions # 0.74 insn per cycle # 0.40 stalled cycles per insn ( +- 0.37% ) (70.16%) 102782224964 branches # 171.853 M/sec ( +- 0.62% ) (69.28%) 9295357532 branch-misses # 9.04% of all branches ( +- 1.08% ) (66.21%) 341.466 +- 0.305 seconds time elapsed ( +- 0.09% ) CC: Alexander Duyck 1. https://lore.kernel.org/all/20240228093013.8263-1-linyunsheng@huawei.com/ Yunsheng Lin (10): mm: Move the page fragment allocator from page_alloc into its own file mm: page_frag: use initial zero offset for page_frag_alloc_align() mm: page_frag: change page_frag_alloc_* API to accept align param mm: page_frag: add '_va' suffix to page_frag API mm: page_frag: add two inline helper for page_frag API mm: page_frag: reuse MSB of 'size' field for pfmemalloc mm: page_frag: reuse existing bit field of 'va' for pagecnt_bias net: introduce the skb_copy_to_va_nocache() helper mm: page_frag: introduce prepare/commit API for page_frag net: replace page_frag with page_frag_cache drivers/net/ethernet/google/gve/gve_rx.c | 4 +- drivers/net/ethernet/intel/ice/ice_txrx.c | 2 +- drivers/net/ethernet/intel/ice/ice_txrx.h | 2 +- drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 2 +- .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 4 +- .../marvell/octeontx2/nic/otx2_common.c | 2 +- drivers/net/ethernet/mediatek/mtk_wed_wo.c | 4 +- drivers/net/tun.c | 36 ++--- drivers/nvme/host/tcp.c | 8 +- drivers/nvme/target/tcp.c | 22 +-- drivers/vhost/net.c | 6 +- include/linux/gfp.h | 22 --- include/linux/mm_types.h | 18 --- include/linux/page_frag_cache.h | 142 ++++++++++++++++ include/linux/sched.h | 5 +- include/linux/skbuff.h | 15 +- include/net/sock.h | 22 ++- kernel/bpf/cpumap.c | 2 +- kernel/exit.c | 3 +- kernel/fork.c | 2 +- mm/Makefile | 1 + mm/page_alloc.c | 136 ---------------- mm/page_frag_alloc.c | 152 ++++++++++++++++++ net/core/skbuff.c | 54 ++++--- net/core/skmsg.c | 24 +-- net/core/sock.c | 24 +-- net/core/xdp.c | 2 +- net/ipv4/ip_output.c | 37 +++-- net/ipv4/tcp.c | 33 ++-- net/ipv4/tcp_output.c | 30 ++-- net/ipv6/ip6_output.c | 37 +++-- net/kcm/kcmsock.c | 28 ++-- net/mptcp/protocol.c | 72 ++++++--- net/rxrpc/txbuf.c | 16 +- net/sunrpc/svcsock.c | 4 +- net/tls/tls_device.c | 139 +++++++++------- 36 files changed, 661 insertions(+), 451 deletions(-) create mode 100644 include/linux/page_frag_cache.h create mode 100644 mm/page_frag_alloc.c