From patchwork Sat Jan 9 16:03:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 12008449 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, 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 0215DC4332E for ; Sat, 9 Jan 2021 16:08:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BAC4223A04 for ; Sat, 9 Jan 2021 16:08:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727004AbhAIQIL (ORCPT ); Sat, 9 Jan 2021 11:08:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726527AbhAIQII (ORCPT ); Sat, 9 Jan 2021 11:08:08 -0500 Received: from mail-wm1-x32f.google.com (mail-wm1-x32f.google.com [IPv6:2a00:1450:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B8A73C0617A5; Sat, 9 Jan 2021 08:06:52 -0800 (PST) Received: by mail-wm1-x32f.google.com with SMTP id k10so10197014wmi.3; Sat, 09 Jan 2021 08:06:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=BfcAWicfY3ps8Cp/gsA4qs7Avo53ajYGpXmNYv+JbSY=; b=AeQssdOPinNt7VEfPxpzOS0PFW0o40Y9EV+3MG63+Dd8wEjtQhPls6aUI/zqMC4gsv IW3I6GjVy1dOi5SnlEp+YRA1/gtBdhH5asZs1Vc8BwgkTu/OQL9SiwZQeTeh6MEK9Ytx oKJWgI/oCxvRIUq3vpAnYYeXiwoUDBD2DaSwvxqPoCeBCIOxe63PTPOjy+qnYmafOzLt pOInVokeOb4fjqx5nf6WKgyOT4BJn7nKX37LNZAUETQywherYZWmn6EShmOq2aNMEzsS +u1A8+eL2dHUF/rHQOXJTo6YWxB4tASlksAkwh8nvZUnfMoL5BQpSeLSg0/B3npBgBaE OwzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=BfcAWicfY3ps8Cp/gsA4qs7Avo53ajYGpXmNYv+JbSY=; b=BHGQA2UIqbpfCASUyFgEzop2pJwTum3A7MttmuA/MrYk2Y3Fziq9Bxy0/lqLKHk8zc rmTsFH9Vfb8m96q1zpOJCLRfsPkZthPsR6OAgXBay6d/22KO0DS0yhZEb+Q4SI6RFFZH G+pEqVuPrPfrrFloNkvEB8DItyqJbwtX/jL4sphIZwoEPXDZl9P6Tg7nXmOERVZgiliM BpbYZEdabwzwe1QfRoKpDrbyVV6nkpslp4HXbWZriYkGIgeFk84UXfclgF1cSV1b8N6U 2BoSt0luBZm/j/zdFs1MkZA065atDw4ledBsvR2A6An6s9RYWPw4DVeyc+q1PrW+BDPP Y2uQ== X-Gm-Message-State: AOAM531nrSjIY+5yn6vWpErUL/Le9z/2dp1MNepGCXcwuMNQQIwKYPUt HVseCUtTEabpC7s8yQRqJaR90G0HzrRuyCZC X-Google-Smtp-Source: ABdhPJx4y4lbIa9CtCF5CrCkTJk2J7iIX4ikX7/zFLt/oXjOr5IOUBU+qaI+PSRkIWiQi2yqw+zLjA== X-Received: by 2002:a1c:4384:: with SMTP id q126mr7875358wma.84.1610208411272; Sat, 09 Jan 2021 08:06:51 -0800 (PST) Received: from localhost.localdomain ([185.69.144.125]) by smtp.gmail.com with ESMTPSA id j9sm17403866wrm.14.2021.01.09.08.06.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 Jan 2021 08:06:50 -0800 (PST) From: Pavel Begunkov To: linux-block@vger.kernel.org Cc: Jens Axboe , Christoph Hellwig , Matthew Wilcox , Ming Lei , Johannes Weiner , Alexander Viro , "Darrick J . Wong" , "Martin K . Petersen" , Jonathan Corbet , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-doc@vger.kernel.org, Christoph Hellwig Subject: [PATCH v3 5/7] iov_iter: optimise bvec iov_iter_advance() Date: Sat, 9 Jan 2021 16:03:01 +0000 Message-Id: <58552e3ba333650ccd425823cb9dc0b949350959.1610170479.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org iov_iter_advance() is heavily used, but implemented through generic means. For bvecs there is a specifically crafted function for that, so use bvec_iter_advance() instead, it's faster and slimmer. Reviewed-by: Christoph Hellwig Signed-off-by: Pavel Begunkov Reviewed-by: Ming Lei --- lib/iov_iter.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 7de304269641..9b1c109dc8a9 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1065,6 +1065,21 @@ static void pipe_advance(struct iov_iter *i, size_t size) pipe_truncate(i); } +static void iov_iter_bvec_advance(struct iov_iter *i, size_t size) +{ + struct bvec_iter bi; + + bi.bi_size = i->count; + bi.bi_bvec_done = i->iov_offset; + bi.bi_idx = 0; + bvec_iter_advance(i->bvec, &bi, size); + + i->bvec += bi.bi_idx; + i->nr_segs -= bi.bi_idx; + i->count = bi.bi_size; + i->iov_offset = bi.bi_bvec_done; +} + void iov_iter_advance(struct iov_iter *i, size_t size) { if (unlikely(iov_iter_is_pipe(i))) { @@ -1075,6 +1090,10 @@ void iov_iter_advance(struct iov_iter *i, size_t size) i->count -= size; return; } + if (iov_iter_is_bvec(i)) { + iov_iter_bvec_advance(i, size); + return; + } iterate_and_advance(i, size, v, 0, 0, 0) } EXPORT_SYMBOL(iov_iter_advance);