From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 33E51C4727D for ; Tue, 22 Sep 2020 08:40:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D622F23A69 for ; Tue, 22 Sep 2020 08:40:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600764008; bh=tvhij8pgV6SUhbNJ0YXjdpggUwFiSRg+69/kr1GP5xo=; h=From:Cc:Subject:Date:To:List-ID:From; b=LgCjafxfT3SOlOWTX7HxNtv8gKbTfQER6zLaCmrUvQ41CSqwAwFyKdTr/6DyqES6b Zp0P9Rn49JTuWq3fyiJH/W2givQGPfmTCQTY6VPc074VT72Mclru2uxNNzc7VHkLtX peALl+e7pFBqcFXALkmoJXR/TJQBdLUji+sDJWjg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726577AbgIVIkH (ORCPT ); Tue, 22 Sep 2020 04:40:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:39848 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726098AbgIVIkH (ORCPT ); Tue, 22 Sep 2020 04:40:07 -0400 Received: from localhost (unknown [213.57.247.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1F07B23A34; Tue, 22 Sep 2020 08:40:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600764006; bh=tvhij8pgV6SUhbNJ0YXjdpggUwFiSRg+69/kr1GP5xo=; h=From:To:Cc:Subject:Date:From; b=uL/Dk1Q2J4t7IB3gxjpObZyP0l/Mume8siqJcyeS/5XNP+X6qcEAh2HRzM63kgEcU u4TPaoBWl1+IBziVD0Fbo9sj0AMA/qnQ8Xz/EF6yWmm+1X9PoRK36HxyRu3uF7gR2k E9AdqrRipCUcj2cVmWDTn9VZ7SC5UcEplhLkTTQo= From: Leon Romanovsky Cc: Leon Romanovsky , Daniel Vetter , David Airlie , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Jani Nikula , Joonas Lahtinen , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, Maor Gottlieb , Rodrigo Vivi , Roland Scheidegger , VMware Graphics Subject: [PATCH rdma-next v3 0/2] Dynamicaly allocate SG table from the pages Date: Tue, 22 Sep 2020 11:39:56 +0300 Message-Id: <20200922083958.2150803-1-leon@kernel.org> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Leon Romanovsky Changelog: v3: * Squashed Christopher's suggestion to avoid introduced new API, but extend existing one. v2: https://lore.kernel.org/linux-rdma/20200916140726.839377-1-leon@kernel.org * Fixed indentations and comments * Deleted sg_alloc_next() * Squashed lib/scatterlist patches into one v1: https://lore.kernel.org/lkml/20200910134259.1304543-1-leon@kernel.org * Changed _sg_chain to be __sg_chain * Added dependency on ARCH_NO_SG_CHAIN * Removed struct sg_append v0: * https://lore.kernel.org/lkml/20200903121853.1145976-1-leon@kernel.org -------------------------------------------------------------------------- >From Maor: This series extends __sg_alloc_table_from_pages to allow chaining of new pages to already initialized SG table. This allows drivers to utilize the optimization of merging contiguous pages without a need to pre allocate all the pages and hold them in a very large temporary buffer prior to the call to SG table initialization. The second patch changes the Infiniband driver to use the new API. It removes duplicate functionality from the code and benefits the optimization of allocating dynamic SG table from pages. In huge pages system of 2MB page size, without this change, the SG table would contain x512 SG entries. E.g. for 100GB memory registration: Number of entries Size Before 26214400 600.0MB After 51200 1.2MB Thanks Maor Gottlieb (2): lib/scatterlist: Add support in dynamic allocation of SG table from pages RDMA/umem: Move to allocate SG table from pages drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 12 +- drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c | 15 +- drivers/infiniband/core/umem.c | 92 ++---------- include/linux/scatterlist.h | 43 +++--- lib/scatterlist.c | 158 +++++++++++++++----- lib/sg_pool.c | 3 +- tools/testing/scatterlist/main.c | 9 +- 7 files changed, 175 insertions(+), 157 deletions(-) -- 2.26.2