From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: * X-Spam-ASN: AS3215 2.6.0.0/16 X-Spam-Status: No, score=1.3 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,LIST_MIRROR_RECEIVED,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE shortcircuit=no autolearn=no autolearn_force=no version=3.4.2 Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by dcvr.yhbt.net (Postfix) with ESMTP id F3D4F1F953 for ; Fri, 11 Feb 2022 20:59:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353467AbiBKU40 (ORCPT ); Fri, 11 Feb 2022 15:56:26 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:49496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232904AbiBKU4Z (ORCPT ); Fri, 11 Feb 2022 15:56:25 -0500 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37B3CBA4 for ; Fri, 11 Feb 2022 12:56:23 -0800 (PST) Received: by mail-wr1-x433.google.com with SMTP id s10so3656846wrb.1 for ; Fri, 11 Feb 2022 12:56:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=RRpz92VGuvw0YR2fhpzZ+/QaEGfxZA1ikNoqwNpxXPw=; b=HaByYoJL9fTSzHxbHXyTXPmRw5r6/qrOMTcl6zyZsDvroAoI3ErLurvjSQMJ0y7Mn9 D4cpCjKZeZ58Or+tT30/PHSSmILh/DCGmFiJY28RWj3mNSpuGX4C8cHZ+KMAvO2NaxkK 9VJJ5thlafDuD/l94nahvEBnVHPf+05Z8+8BqaT1psAZ+2X0AyfoM9AP5kkbePMWt/cc YEk8MloEwF0dfcokqho3C0hMav31jsGA/2Azxkfq939oPWY5ifpzCe48Jkdxph+sKBvB OdkxXlLt1ioJQOCbscd4vbQTujUT7JfR4LLIBnU78Btlb2Z/pMM3RF3nxrLVDW7a99gO 105Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=RRpz92VGuvw0YR2fhpzZ+/QaEGfxZA1ikNoqwNpxXPw=; b=uO3tksNq5fw56Uj8Gcnf854PrkISC1fE50AVF26QyZqAfqeNZOU+anEEPmLtEea6F9 gML1uhTM0An7ZuOuwsMrY0YRoq5jrPymBjxJ17FwUzZS3YNsLY2oNeE9vYEtTe3wKtuL opdh1TYmaHvcGeXDSzADW2juDto7UHY7NYK1X79M9VierH6rEWNbSSbB+pyPos3wx9wR 7ITEYoG8TBPTG/tTqHdOHopC39iV3YnJmdyJjBUgfbXy5Yf0jEOYYTpC6+J5dkeDJLqI NaOS3pvPFGYnfh0z5Gq53628Yy8zPhtOEk6D9MInnZGHTDkXFkNuX4JOlPta9cuVNnti J7WA== X-Gm-Message-State: AOAM5315M5bG6mEEKkK3LGbAe/WKfNTunLOIA87Dmnv1djHWgft/I39T 2W9CnsTylSQSgD4TLmrKbhW8UKBQ64Y= X-Google-Smtp-Source: ABdhPJz7mTeB+1orxzjmBk38iaqYFLSTN19KJ+SA3XP97et5lJQVWmChUaxRfwkIAG6DXVFih/aUMA== X-Received: by 2002:a5d:5541:: with SMTP id g1mr2620224wrw.515.1644612981628; Fri, 11 Feb 2022 12:56:21 -0800 (PST) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id k34sm4048356wms.35.2022.02.11.12.56.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Feb 2022 12:56:21 -0800 (PST) Message-Id: In-Reply-To: References: From: "Jeff Hostetler via GitGitGadget" Date: Fri, 11 Feb 2022 20:55:50 +0000 Subject: [PATCH v5 01/30] fsmonitor: enhance existing comments, clarify trivial response handling Fcc: Sent Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 To: git@vger.kernel.org Cc: Bagas Sanjaya , =?UTF-8?Q?=C3=86var_Arnfj=C3=B6r=C3=B0?= Bjarmason , Jeff Hostetler , Eric Sunshine , Jeff Hostetler , Jeff Hostetler Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Jeff Hostetler Signed-off-by: Jeff Hostetler --- fsmonitor.c | 64 ++++++++++++++++++++++++++++++++++------------------- 1 file changed, 41 insertions(+), 23 deletions(-) diff --git a/fsmonitor.c b/fsmonitor.c index ab9bfc60b34..448d0ee33f5 100644 --- a/fsmonitor.c +++ b/fsmonitor.c @@ -168,29 +168,15 @@ static int query_fsmonitor(int version, const char *last_update, struct strbuf * if (result) trace2_data_intmax("fsm_hook", NULL, "query/failed", result); - else { + else trace2_data_intmax("fsm_hook", NULL, "query/response-length", query_result->len); - if (fsmonitor_is_trivial_response(query_result)) - trace2_data_intmax("fsm_hook", NULL, - "query/trivial-response", 1); - } - trace2_region_leave("fsm_hook", "query", NULL); return result; } -int fsmonitor_is_trivial_response(const struct strbuf *query_result) -{ - static char trivial_response[3] = { '\0', '/', '\0' }; - - return query_result->len >= 3 && - !memcmp(trivial_response, - &query_result->buf[query_result->len - 3], 3); -} - static void fsmonitor_refresh_callback(struct index_state *istate, char *name) { int i, len = strlen(name); @@ -238,6 +224,7 @@ void refresh_fsmonitor(struct index_state *istate) struct strbuf last_update_token = STRBUF_INIT; char *buf; unsigned int i; + int is_trivial = 0; if (!core_fsmonitor || istate->fsmonitor_has_run_once) return; @@ -283,6 +270,7 @@ void refresh_fsmonitor(struct index_state *istate) query_success = 0; } else { bol = last_update_token.len + 1; + is_trivial = query_result.buf[bol] == '/'; } } else if (hook_version < 0) { hook_version = HOOK_INTERFACE_VERSION1; @@ -294,16 +282,38 @@ void refresh_fsmonitor(struct index_state *istate) if (hook_version == HOOK_INTERFACE_VERSION1) { query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION1, istate->fsmonitor_last_update, &query_result); + if (query_success) + is_trivial = query_result.buf[0] == '/'; } + if (is_trivial) + trace2_data_intmax("fsm_hook", NULL, + "query/trivial-response", 1); + trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor); trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s", core_fsmonitor, query_success ? "success" : "failure"); } - /* a fsmonitor process can return '/' to indicate all entries are invalid */ - if (query_success && query_result.buf[bol] != '/') { - /* Mark all entries returned by the monitor as dirty */ + /* + * The response from FSMonitor (excluding the header token) is + * either: + * + * [a] a (possibly empty) list of NUL delimited relative + * pathnames of changed paths. This list can contain + * files and directories. Directories have a trailing + * slash. + * + * [b] a single '/' to indicate the provider had no + * information and that we should consider everything + * invalid. We call this a trivial response. + */ + if (query_success && !is_trivial) { + /* + * Mark all pathnames returned by the monitor as dirty. + * + * This updates both the cache-entries and the untracked-cache. + */ buf = query_result.buf; for (i = bol; i < query_result.len; i++) { if (buf[i] != '\0') @@ -318,11 +328,16 @@ void refresh_fsmonitor(struct index_state *istate) if (istate->untracked) istate->untracked->use_fsmonitor = 1; } else { - - /* We only want to run the post index changed hook if we've actually changed entries, so keep track - * if we actually changed entries or not */ + /* + * We failed to get a response or received a trivial response, + * so invalidate everything. + * + * We only want to run the post index changed hook if + * we've actually changed entries, so keep track if we + * actually changed entries or not. + */ int is_cache_changed = 0; - /* Mark all entries invalid */ + for (i = 0; i < istate->cache_nr; i++) { if (istate->cache[i]->ce_flags & CE_FSMONITOR_VALID) { is_cache_changed = 1; @@ -330,7 +345,10 @@ void refresh_fsmonitor(struct index_state *istate) } } - /* If we're going to check every file, ensure we save the results */ + /* + * If we're going to check every file, ensure we save + * the results. + */ if (is_cache_changed) istate->cache_changed |= FSMONITOR_CHANGED; -- gitgitgadget