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 B0CB2C433E2 for ; Mon, 29 Mar 2021 13:06:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 780E861969 for ; Mon, 29 Mar 2021 13:06:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231422AbhC2NF7 (ORCPT ); Mon, 29 Mar 2021 09:05:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55486 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231136AbhC2NFw (ORCPT ); Mon, 29 Mar 2021 09:05:52 -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 5EF22C061756 for ; Mon, 29 Mar 2021 06:05:50 -0700 (PDT) Received: by mail-ej1-x62f.google.com with SMTP id u5so19346851ejn.8 for ; Mon, 29 Mar 2021 06:05:50 -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=3TViJ7SE5R90odfzRBnnvVIw5vnuAodunwkoluO1S3A=; b=S4JWnbe8m/f5kUz+20WWyFWoqliHZrzU2+SBIg71qcaX/yOSNsja8dYiDdXtHYPJNm EXLQ7ADyCYbmQ3iwyVd+lakWt1I8IZhIvJplvLReZodMYLBb9nkHdPnDkwAtNyhrGNT2 P9wF9K3g9e+K0C0YZL6SAFo7I+lL+fE09z0MELKkvQYJHLo0ps0un3IdQraZhx74uOPb ywAKpaZYk7l2RLoKBi1bFVNOEPaLgWxzwLIw/mrcpvFBIDu+D5Ji8Tz0ZDEG/7V5iJI6 7gaHyZVSP5uFVeQ4qAUV3Ia3/yoVwH8sbr49MHQ/wB4TE9p8eqZLJjvyQnnmEcIYZP0g C8jQ== 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=3TViJ7SE5R90odfzRBnnvVIw5vnuAodunwkoluO1S3A=; b=j6nQrFkP8+1W4q4fhQO1Qw39VSeDIM+yPs0uMcGQ97oXpguiLCQY0vG4rz8D0hw11w 6/0mnAuuYck7eoalrOSf3NtAxJklTxiaBzGEoFIgau2Y+T8ZIxKEmLK8K1/JVZGx6qW/ qwW4xldFCRlU2p7xIYfEDSFhzWqzLXjMqvvXjuE83y/mbcesyHCxdnwZCpE5LtksApq9 OpqXSiRMDtlOGRWYCmV/0YDO7PPUviyGc8NiMxrAUdR8yY4ivIo/zfFMTZWPTMqPUWb8 msftBagpEeDnskHyGY9h8TcypQaI7myUGLeEiqake6Ww+V8+81sjsRfJyltj3CaKDiB+ 4CCA== X-Gm-Message-State: AOAM531BRnpmpctokfnAy4fr7fOVTlV6h5Fbc1siFIwleG0qedoggx33 vDtq5ioEIqa9AMjfAErXMH/6E0awmrsV3w== X-Google-Smtp-Source: ABdhPJyWInp8VA3LCdQAqlwxx3eS8nVmWVte8zbr44J5CvhVCb7rJ6J886W3mbZoCWaZ3x0uDWthfg== X-Received: by 2002:a17:906:f296:: with SMTP id gu22mr27894329ejb.20.1617023148821; Mon, 29 Mar 2021 06:05:48 -0700 (PDT) Received: from localhost.localdomain ([95.87.199.133]) by smtp.gmail.com with ESMTPSA id gt37sm8123905ejc.12.2021.03.29.06.05.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Mar 2021 06:05:48 -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 v2 3/5] tracing: Add method for recording "func_repeats" events Date: Mon, 29 Mar 2021 16:05:31 +0300 Message-Id: <20210329130533.199507-4-y.karadz@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210329130533.199507-1-y.karadz@gmail.com> References: <20210329130533.199507-1-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 ++++ 2 files changed, 30 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 6fcc159c34a8..0d3d14112f50 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3116,6 +3116,32 @@ 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[]); -- 2.25.1