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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 818C7C43331 for ; Tue, 19 Jan 2021 18:30:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 59AE922AAA for ; Tue, 19 Jan 2021 18:30:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733193AbhASSWp (ORCPT ); Tue, 19 Jan 2021 13:22:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392531AbhASSUC (ORCPT ); Tue, 19 Jan 2021 13:20:02 -0500 Received: from mail-qt1-x835.google.com (mail-qt1-x835.google.com [IPv6:2607:f8b0:4864:20::835]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA0F6C061757 for ; Tue, 19 Jan 2021 10:19:20 -0800 (PST) Received: by mail-qt1-x835.google.com with SMTP id v5so14381421qtv.7 for ; Tue, 19 Jan 2021 10:19:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ttaylorr-com.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=Hi4N2WNwddO33w2ira543eAG0bSqGyiGjl0UrnoQOCU=; b=riaju/HPvsymt20f+bdw+Bl8g/VQH/DD3Q455q7EWI8YzRs2ZR0Gq2Xb5I2Mkm057c 3eaa880jit/CIZ/IOpjtncGGMK5pEftp1GmOiCXX2xKJDOyF7825XofJc8SO0+JFNySb q3yFcI91JoDwj9v82hFEgEs9iSPb4UB3oCmMPRKFwbQgFY6ElXgVELtG8oLnmdRyKIRL N1aWo+DFMwZdfW72JLwnG7YnJ01Zl0+tBkHDqB9rD5IVGTgJVUyJyLn9VldxfG/eBoPK 0F617rAKyFeqnBqvYUEpC0I7XzaOkmZidoEiTqhkLesDL5XHNSo1Sdt2un9EAXzauUiF GF9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Hi4N2WNwddO33w2ira543eAG0bSqGyiGjl0UrnoQOCU=; b=qLfKRym99/1HWaFRkkLYD8QKvoa0j8C+DdSCpj4tHwmFevG9G2Sv651ZCffjnlLiGI IPJ3YLJFWDL0/TSuYkMKc5O6FnarLdzMbtKn8ktPz9vaCf6SK0YBJu0khhnfYvCpp8h7 QtuVQnGrSD7Q8nPhSvhJK3ym29+eheu87XD+6U4sp7yPpCgaiHeRJiHWFxjdWxhxZqe6 iQohUVmIs8NAv1Ix4X5zFfBE0kOfOG1YPq+X901PMzhYL7VboQnjkmNTTqEjccrbyxJw jv4aG1tS+loyQXCCOFkUhdGtzuA3xDjj5DUWLoergQo3rASsfuWTV0QDuiZ85//P7KjQ zj6A== X-Gm-Message-State: AOAM531YnMT6Yh1oTB0LSjDB/pCFe+k1fND0CPHv5NuQPkdMY3fPy21A 9CRFZOc1X2/Ek2MDizehNTKF09BhD31P0g== X-Google-Smtp-Source: ABdhPJyERZgMvqZGDcTWRfaY7bWtY3Tetip3RJUqzUMjnpz2YnVW97qV79by/AADlC/sc6Bwvk3gmA== X-Received: by 2002:ac8:6d05:: with SMTP id o5mr5571018qtt.6.1611080359648; Tue, 19 Jan 2021 10:19:19 -0800 (PST) Received: from localhost ([2605:9480:22e:ff10:ed38:94a5:e78e:2d58]) by smtp.gmail.com with ESMTPSA id k64sm13623723qkc.110.2021.01.19.10.19.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Jan 2021 10:19:19 -0800 (PST) Date: Tue, 19 Jan 2021 13:19:17 -0500 From: Taylor Blau To: git@vger.kernel.org Cc: jacob@gitlab.com, peff@peff.net Subject: [PATCH 2/2] ls-refs.c: traverse longest common ref prefix Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org ls-refs performs a single revision walk over the whole ref namespace, and sends ones that match with one of the given ref prefixes down to the user. This can be expensive if there are many refs overall, but the portion of them covered by the given prefixes is small by comparison. To attempt to reduce the difference between the number of refs traversed, and the number of refs sent, only traverse references which are in the longest common prefix of the given prefixes. This is very reminiscent of the approach taken in b31e2680c4 (ref-filter.c: find disjoint pattern prefixes, 2019-06-26) which does an analogous thing for multi-patterned 'git for-each-ref' invocations. The only difference here is that we are operating on ref prefixes, which do not necessarily point to a single reference. That is just fine, since all we care about is finding the longest common prefix among prefixes which can be thought of as refspecs for our purposes here. Similarly, for_each_fullref_in_prefixes may return more results than the caller asked for (since the longest common prefix might match something that a longer prefix in the same set wouldn't match) but ls-refs.c:send_ref() discards such results. The code introduced in b31e2680c4 is resilient to stop early (and return a shorter prefix) when it encounters a metacharacter (as mentioned in that patch, there is some opportunity to improve this, but nobody has done it). There are two remaining small items in this patch: - If no prefixes were provided, then implicitly add the empty string (which will match all references). - Since we are manually munging the prefixes, make sure that we initialize it ourselves (previously this wasn't necessary since the first strvec_push would do so). Original-patch-by: Jacob Vosmaer Signed-off-by: Taylor Blau --- ls-refs.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/ls-refs.c b/ls-refs.c index a1e0b473e4..eaaa36d0df 100644 --- a/ls-refs.c +++ b/ls-refs.c @@ -90,6 +90,7 @@ int ls_refs(struct repository *r, struct strvec *keys, struct ls_refs_data data; memset(&data, 0, sizeof(data)); + strvec_init(&data.prefixes); git_config(ls_refs_config, NULL); @@ -109,7 +110,10 @@ int ls_refs(struct repository *r, struct strvec *keys, die(_("expected flush after ls-refs arguments")); head_ref_namespaced(send_ref, &data); - for_each_namespaced_ref(send_ref, &data); + if (!data.prefixes.nr) + strvec_push(&data.prefixes, ""); + for_each_fullref_in_prefixes(get_git_namespace(), data.prefixes.v, + send_ref, &data, 0); packet_flush(1); strvec_clear(&data.prefixes); return 0; -- 2.30.0.138.g6d7191ea01