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=-15.8 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,USER_AGENT_GIT 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 73C48C43603 for ; Thu, 15 Apr 2021 18:19:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C42D611BF for ; Thu, 15 Apr 2021 18:19:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234683AbhDOSTu (ORCPT ); Thu, 15 Apr 2021 14:19:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60934 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234506AbhDOSTj (ORCPT ); Thu, 15 Apr 2021 14:19:39 -0400 Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B822DC061756 for ; Thu, 15 Apr 2021 11:19:15 -0700 (PDT) Received: by mail-ej1-x62f.google.com with SMTP id w3so38323220ejc.4 for ; Thu, 15 Apr 2021 11:19:15 -0700 (PDT) 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=+PqbqWfdg20x+owT9zu6vsX1RTHS/rsPqJzoP1vJhvk=; b=b7SxeApSb+oOMwN48cWg8N5oqiitHIhgQVQeFQMBCsdilHDLQAmJGKWdhwIhY4WvoL iXUZvgWojojIVLIJ0RYnXqf86leadLLRoAfwYyf8CIlSWRsSPS64jdNDMmJv2u6QF+fY iUd/CicCdQHxHgsHuYQpfdvHOtbd1QU9MD5x4lRHU0Qe8TTg5vVTQev/6jzpYzcmRySf QGzEeYk7ZG2dA2lb1JX6BGOrUQ2/ZqxGMVJebnoUdXTujZS6F4k3SptXyAFJ1/huFNlB 0aIK/dgXJPISO0zaCAVb0pRCZEyA0tN221VCLqf6qgOC2tie5SzB+NnBt36X8I3VxrrJ 2SNA== 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=+PqbqWfdg20x+owT9zu6vsX1RTHS/rsPqJzoP1vJhvk=; b=o9v2t1ngtZWsNhCVeW9jZEIJkZeB/QoFG8T9i3CICEibY9LfPaYXuboSUuaa5yY1aY uxb1rpulMANkfwDktHvp/ag8Rfga7AcZg2XWRynqIiDnPYTNQVp7e5AF8qGVFEh0dUPt sV5LFWXW6ol10akEHvrj5Zdf+W/SMmCJn9eDWMtV7b6LOidJ2x6My1vuQe1CqrJbdmb/ t5ZmEMgQM3qwOIbtzRj48Mas3znX7sTA+xVkBPa0wBXtCD92ijYGLvJ4SSLXnEDiKQD0 +Aa0hFis5iR5niEM8wYeHGT8eAOdGqlozTq4vhMZ73qunp3mqNSqTdxnknV1ZvGu7cym fDWg== X-Gm-Message-State: AOAM531Dx0wOjdcS5dMitdiJT2yjng87dPAMxgTJ+bzIYs6tsSkOOW9M Mci6WaIUYgHKFHyqTHdqBReAKkGsYAE= X-Google-Smtp-Source: ABdhPJyAcU/WLDMq5maxVY1fyjwgGHC5zvZFWwrltQOsc4HoR1wgEwlWr6oB0XsHQASsFafc0M8ZYQ== X-Received: by 2002:a17:906:55d1:: with SMTP id z17mr4640589ejp.164.1618510754325; Thu, 15 Apr 2021 11:19:14 -0700 (PDT) Received: from localhost.localdomain ([84.40.93.55]) by smtp.gmail.com with ESMTPSA id h9sm1130903ejf.10.2021.04.15.11.19.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Apr 2021 11:19:13 -0700 (PDT) From: "Yordan Karadzhov (VMware)" To: linux-kernel@vger.kernel.org Cc: rostedt@goodmis.org, tglx@linutronix.de, peterz@infradead.org, "Yordan Karadzhov (VMware)" Subject: [PATCH v4 4/6] tracing: Add method for recording "func_repeats" events Date: Thu, 15 Apr 2021 21:18:52 +0300 Message-Id: <20210415181854.147448-5-y.karadz@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210415181854.147448-1-y.karadz@gmail.com> References: <20210415181854.147448-1-y.karadz@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch only provides the implementation of the method. Later we will used it in a combination with a new option for function tracing. Signed-off-by: Yordan Karadzhov (VMware) --- kernel/trace/trace.c | 34 ++++++++++++++++++++++++++++++++++ kernel/trace/trace.h | 4 ++++ 2 files changed, 38 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 82833be07c1e..66a4ad93b5e9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3117,6 +3117,40 @@ static void ftrace_trace_userstack(struct trace_array *tr, #endif /* CONFIG_STACKTRACE */ +static inline void +func_repeats_set_delta_ts(struct func_repeats_entry *entry, + unsigned long long delta) +{ + entry->bottom_delta_ts = delta & U32_MAX; + entry->top_delta_ts = (delta >> 32); +} + +void trace_last_func_repeats(struct trace_array *tr, + struct trace_func_repeats *last_info, + unsigned int trace_ctx) +{ + struct trace_buffer *buffer = tr->array_buffer.buffer; + struct func_repeats_entry *entry; + struct ring_buffer_event *event; + u64 delta; + + event = __trace_buffer_lock_reserve(buffer, TRACE_FUNC_REPEATS, + sizeof(*entry), trace_ctx); + if (!event) + return; + + delta = ring_buffer_event_time_stamp(buffer, event) - + last_info->ts_last_call; + + entry = ring_buffer_event_data(event); + entry->ip = last_info->ip; + entry->parent_ip = last_info->parent_ip; + entry->count = last_info->count; + func_repeats_set_delta_ts(entry, delta); + + __buffer_unlock_commit(buffer, event); +} + /* created for use with alloc_percpu */ struct trace_buffer_struct { int nesting; diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index a4f1b66049fd..cd80d046c7a5 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -695,6 +695,10 @@ static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, } #endif /* CONFIG_STACKTRACE */ +void trace_last_func_repeats(struct trace_array *tr, + struct trace_func_repeats *last_info, + unsigned int trace_ctx); + extern u64 ftrace_now(int cpu); extern void trace_find_cmdline(int pid, char comm[]); -- 2.25.1