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 9C6EFC433E6 for ; Thu, 4 Mar 2021 09:04:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E24464F1E for ; Thu, 4 Mar 2021 09:04:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237371AbhCDJEB (ORCPT ); Thu, 4 Mar 2021 04:04:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237295AbhCDJDY (ORCPT ); Thu, 4 Mar 2021 04:03:24 -0500 Received: from mail-ej1-x62e.google.com (mail-ej1-x62e.google.com [IPv6:2a00:1450:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F74AC061762 for ; Thu, 4 Mar 2021 01:02:22 -0800 (PST) Received: by mail-ej1-x62e.google.com with SMTP id lr13so47846422ejb.8 for ; Thu, 04 Mar 2021 01:02:22 -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=Eu5OJzH7maufbREWovWushZstOy2hgo0oLSHqoVL++k=; b=imRENuLrcxxdbwjnbS0xNPn/qyDaRMGGVsSekjpuWvRIXE+UCPxeYOsD4eCQ+IUeZ8 gJN7qL20TeeXL+pID9+i370/fmIt0EJGeHbzVuTKu5YneKqwx1nhBFUIMpN4xrZe1N9n iNy4ETNY6nF2xx+SKmZmPYiXhT1Ndw3WXpPUZFxZvm+Zq5PWtrPi6IzSeelu2xpKLOn6 yNzRCxGwvMPkjYhsa1Vw2hE4nD0xQq+ivHc5TiO2Zk3730LtYE/R3gP2oLNltZhPmM6+ Ym38u7T8f0xPtu7eIjhEKV86KUjASeCE11TCMmF3bRubdPe4U/Kcq9ijfdY/icoungF4 8q2g== 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=Eu5OJzH7maufbREWovWushZstOy2hgo0oLSHqoVL++k=; b=Xg63PFMOPzOMx2+FkbB3HH81S04+xUgEKI/9S0LAKf4cQT9jwOShYXQ2/lMgG07f5v oWiwFC2E8e1fIL/zRYWtVCyj0Vv6DMPjRVzby15W3I3z+gx9GP+9hAY8PbOyhdNuZc8b rDZ7aV91HJxEvKPvXoe0mKqmI2U6wa3o+6Y6dIW6Tk7TcVnnYb68hfUoyiqEUOAqhCya 59rcDyGYkFefg/vRrFdp1UBnUH1mVT8YczHBUVsorb/vzDt+xzaUtcoGs/rHCa2MFSlS gpuc9F2bqkchmU96pD9DflkAatYpdzu2SF477o7lQfh6hRo36UMWlkorpRUgZrzL7Ti0 3cng== X-Gm-Message-State: AOAM532CwSbeeHftmHeqmIzgLRoVqkmdDUpCdD11nxqs24lN8K0rygts +RJBt6/Y6rZkXxd7DETGC34w4Zl/rEG4AA== X-Google-Smtp-Source: ABdhPJyEbmfrsrKvhMCXHGkT7tCMNu0vMNzRiLUG9aq2u988kNB7WgUTSf6tlVtZNMAc1s3zojRBYA== X-Received: by 2002:a17:906:5043:: with SMTP id e3mr3142322ejk.260.1614848540740; Thu, 04 Mar 2021 01:02:20 -0800 (PST) Received: from localhost.localdomain ([95.87.199.88]) by smtp.gmail.com with ESMTPSA id f22sm23123552eje.34.2021.03.04.01.02.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Mar 2021 01:02:20 -0800 (PST) From: "Yordan Karadzhov (VMware)" To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, "Yordan Karadzhov (VMware)" Subject: [RFC PATCH 3/5] tracing: Add method for recording "func_repeats" events Date: Thu, 4 Mar 2021 11:01:39 +0200 Message-Id: <20210304090141.207309-4-y.karadz@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210304090141.207309-1-y.karadz@gmail.com> References: <20210304090141.207309-1-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 | 21 +++++++++++++++++++++ kernel/trace/trace.h | 4 ++++ 2 files changed, 25 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 5f5fa08c0644..5c62fda666af 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3109,6 +3109,27 @@ 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; + + event = __trace_buffer_lock_reserve(buffer, TRACE_FUNC_REPEATS, + sizeof(*entry), trace_ctx); + if (!event) + return; + + entry = ring_buffer_event_data(event); + entry->ip = last_info->ip; + entry->pip = last_info->parent_ip; + entry->count = last_info->count; + + __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 09bf12c038f4..0ef823bb9594 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -696,6 +696,10 @@ 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