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 12277C43462 for ; Thu, 15 Apr 2021 18:19:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DFCF5610EA for ; Thu, 15 Apr 2021 18:19:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234651AbhDOSTt (ORCPT ); Thu, 15 Apr 2021 14:19:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234465AbhDOSTi (ORCPT ); Thu, 15 Apr 2021 14:19:38 -0400 Received: from mail-ed1-x530.google.com (mail-ed1-x530.google.com [IPv6:2a00:1450:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0701C061574 for ; Thu, 15 Apr 2021 11:19:14 -0700 (PDT) Received: by mail-ed1-x530.google.com with SMTP id x4so29252873edd.2 for ; Thu, 15 Apr 2021 11:19:14 -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=428k0AMzSmqdKdmEqEyPT/nED8Tp6UynaMYEPum1cPk=; b=RMJcdVN1t+an/1vn1xe2D71krKshq66o8EATIk84vthzlp6pUazycyGwi3YrS0g/Ci Zv+eyvDGwVVR7SUpjD94Qh9PbqANotxlb368FbGC46fyqOyN33eO9hMg1unvp4Z6dgGN iIgp9xX/3xPZ6p4LGJKdtpULQ+HnweUxPdcun7IMK1fRRV+trRh4IPpzL+eKYsw8wmdr KgNPZ6uxnTBlESaXvci1tlkBl7pbN9BN0u/e11Gm/LKpu8RT1Dx6LVJfmQ9We8jgYuXA xuHBwNN4tgE419XzTX1+Pczq6RCZt0GU7U6IZ8CSOG6BR0VcXsZeYIYIjrqo++O8fGrG VZEw== 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=428k0AMzSmqdKdmEqEyPT/nED8Tp6UynaMYEPum1cPk=; b=hB7eAOHXgdo+7jFSKUH4Cen4W8+tGSCPkKrS+jw7Alwq+M8sRmr/HrTZwiXwAmLbB5 VkHy0OhusIZQamB9DXVtSEobT6uwxSa2MS95BHKKIfgauNMdDFJN5zLZP354xa5tStiR CNE0wgEU440HU18WR9YYNv1km7irCn1xxL/Ej3Q91Q6h0o0FcuTBvx/qANjX5RZHjAkq 67HzxN/fbPhyYbXz8jfkpaDozAGeVoNITEb8WRYVO3hPMWta4DykQm6Fe0mW7dwYb9ch kusVMd3/i1c6DTj2E40obvt6BjMuyA7Znu7m07gSpOquGSgM2qMpdCa5S1AiFHr4p+4n tLiA== X-Gm-Message-State: AOAM5312wWX6o5Y26A06LEn44/xJfBbDCGYrjxYvupaKP4oc0v8I0j70 vINsi8NXACrA6BWuXC+51yO7spu2TKU= X-Google-Smtp-Source: ABdhPJyzC6apzBSgcGiObSCrF/rnxIhq7S6LTLURabpdj8d3R/VX4Su2edn1T2m7Z5JutpCccA3KdQ== X-Received: by 2002:a05:6402:a4a:: with SMTP id bt10mr5749489edb.39.1618510753464; Thu, 15 Apr 2021 11:19:13 -0700 (PDT) Received: from localhost.localdomain ([84.40.93.55]) by smtp.gmail.com with ESMTPSA id h9sm1130903ejf.10.2021.04.15.11.19.12 (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 3/6] tracing: Add "last_func_repeats" to struct trace_array Date: Thu, 15 Apr 2021 21:18:51 +0300 Message-Id: <20210415181854.147448-4-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 The field is used to keep track of the consecutive (on the same CPU) calls of a single function. This information is needed in order to consolidate the function tracing record in the cases when a single function is called number of times. Signed-off-by: Yordan Karadzhov (VMware) --- kernel/trace/trace.c | 1 + kernel/trace/trace.h | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 507a30bf26e4..82833be07c1e 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9104,6 +9104,7 @@ static int __remove_instance(struct trace_array *tr) ftrace_clear_pids(tr); ftrace_destroy_function_files(tr); tracefs_remove(tr->dir); + free_percpu(tr->last_func_repeats); free_trace_buffers(tr); for (i = 0; i < tr->nr_topts; i++) { diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 6a5b4c2a0fa7..a4f1b66049fd 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -262,6 +262,17 @@ struct cond_snapshot { cond_update_fn_t update; }; +/* + * struct trace_func_repeats - used to keep track of the consecutive + * (on the same CPU) calls of a single function. + */ +struct trace_func_repeats { + unsigned long ip; + unsigned long parent_ip; + unsigned long count; + u64 ts_last_call; +}; + /* * The trace array - an array of per-CPU trace arrays. This is the * highest level data structure that individual tracers deal with. @@ -358,6 +369,7 @@ struct trace_array { #ifdef CONFIG_TRACER_SNAPSHOT struct cond_snapshot *cond_snapshot; #endif + struct trace_func_repeats __percpu *last_func_repeats; }; enum { -- 2.25.1