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 51B55C43461 for ; Fri, 9 Apr 2021 18:11:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C19161007 for ; Fri, 9 Apr 2021 18:11:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234586AbhDISLL (ORCPT ); Fri, 9 Apr 2021 14:11:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234491AbhDISLC (ORCPT ); Fri, 9 Apr 2021 14:11:02 -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 4E9D3C061761 for ; Fri, 9 Apr 2021 11:10:49 -0700 (PDT) Received: by mail-ej1-x62f.google.com with SMTP id r9so10055828ejj.3 for ; Fri, 09 Apr 2021 11:10:49 -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=rd+KQGSQMRoX9Wl6ZAjqbgNO+Rophku4GQjzMQGkis8=; b=M2ABGqp5DVLqVu6iX+hdGL4YIufFsCpOehR8QoZW1IDwf7eKPwe2oZ+WnGl1V9FGjp oSl3hEFQndIe1rYOouK8NadCekOgwyLL0+XxdLHpRRaKb1KM6e05+4reyoauN5qAPfgB Bdj4+/tZfqbVa5u2tTH7gaw4tT7JpsawJTcoferVU4+R0l0qbweOEZmaplINYfILtXqk /btiUj3VU+sMCBnN4Uo+mI7S4vX6qWb6ShFPnI1Nv9yyvFe1Nxg6BS3uLpXOsMRr+h1p Uz5q9EQ+Txn3PBWRenpOY1BHYm2jWvvXiE+c3FHForfZLpZ1WSKCudsZ6TNn9AY2vM2D xySg== 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=rd+KQGSQMRoX9Wl6ZAjqbgNO+Rophku4GQjzMQGkis8=; b=tApLOihhtcXoSKHkX+1amAyroS/e2W7BVRIaV8rIB44SV4OG5TkUwFpRqeJcxZCv3j Sqe8pfhtrlSJQ+FVh455eRr0KHwU/WhZi7EWDLOknWLM4gXDoS7xHYFtl6abcg06E7BB uToDFpk6PHqHAgeDUt4JF6LajLz1ZyxK8YK4jcn1KKGfuk+fz9UOlPD73OQY2nttonqn 00gQmza92TNOUl9/an97Q5F8TNTg95N/fNfOLjokTXweEbs6YnOfFePzEQKa8AGrKct8 3PZ5EFjPcqB+2xOyk0OpPtaUIalP3BfZ+BlB01vE8I09L4hZWK2MDLXB7rUoSLyTbre2 tUJw== X-Gm-Message-State: AOAM531Vb3Wv9at2xLjRJZt9z1fVdQDFkYF445sLq5eggpbsZHBq65PV MV346GNPNpGJzGksUxZJrfjRoUFSy62qJg== X-Google-Smtp-Source: ABdhPJzqwt8P/kdtky2VB/F+kqcaNXiknVyVpqpXm51haiwERhpu4A4sAP60BAspYLPfkWML9YGmkg== X-Received: by 2002:a17:907:3c08:: with SMTP id gh8mr3629412ejc.439.1617991847898; Fri, 09 Apr 2021 11:10:47 -0700 (PDT) Received: from localhost.localdomain ([95.87.199.133]) by smtp.gmail.com with ESMTPSA id s20sm1806303edu.93.2021.04.09.11.10.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Apr 2021 11:10:47 -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 v3 3/5] tracing: Add method for recording "func_repeats" events Date: Fri, 9 Apr 2021 21:10:29 +0300 Message-Id: <20210409181031.26772-4-y.karadz@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210409181031.26772-1-y.karadz@gmail.com> References: <20210409181031.26772-1-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 | 26 ++++++++++++++++++++++++++ kernel/trace/trace.h | 4 ++++ kernel/trace/trace_entries.h | 6 ++++++ 3 files changed, 36 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 82833be07c1e..bbc57cf3bda4 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3117,6 +3117,32 @@ static void ftrace_trace_userstack(struct trace_array *tr, #endif /* CONFIG_STACKTRACE */ +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 1cd4da7ba769..e1f34119c036 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -701,6 +701,10 @@ 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[]); diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h index fdd022a7aecf..5e9dc56af4b1 100644 --- a/kernel/trace/trace_entries.h +++ b/kernel/trace/trace_entries.h @@ -342,6 +342,12 @@ FTRACE_ENTRY(hwlat, hwlat_entry, #define FUNC_REPEATS_GET_DELTA_TS(entry) \ (((u64)entry->top_delta_ts << 32) | entry->bottom_delta_ts) \ +#define FUNC_REPEATS_SET_DELTA_TS(entry, delta) \ + do { \ + entry->bottom_delta_ts = delta & U32_MAX; \ + entry->top_delta_ts = (delta >> 32); \ + } while (0); \ + FTRACE_ENTRY(func_repeats, func_repeats_entry, TRACE_FUNC_REPEATS, -- 2.25.1