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 319C3C433ED for ; Fri, 9 Apr 2021 18:10:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 068DC610C8 for ; Fri, 9 Apr 2021 18:10:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234559AbhDISLK (ORCPT ); Fri, 9 Apr 2021 14:11:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233332AbhDISLB (ORCPT ); Fri, 9 Apr 2021 14:11:01 -0400 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 2DCFCC061762 for ; Fri, 9 Apr 2021 11:10:48 -0700 (PDT) Received: by mail-ej1-x62e.google.com with SMTP id u21so10017117ejo.13 for ; Fri, 09 Apr 2021 11:10:48 -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=WFwcOu4xRxqbiyWXa2HmZCe+M5m6xHGIKM2VUv3lA68=; b=PmtpoltgTjIBn+xoDZhDszfwCFIvr8FMJkFgDwEfIffN19lmVBYc3x9taTcNRXYlQG Lf/EXNM6LZqeSZrfkXSvmHt1MhtdwZMFi3aQkRakIc4Ju+bwuWpP9lZIYYJ7OxNo6rhS +fHh+EvHLBWIgB1dnkpjnM+wx1TUBZpSMqK8uBsvnDefmEG6AWqnl/NCcQpf8wRNoVNp rDrR8Xg0RVHYvUQnX3zmoF2wTKfu07HeRKfW0lGRpEGq+WaJ4oUQNXfxyFj5lGhfIRWB woOYhvUN0bbIt4nNlq8tSk3/UbI2RYiLmMRXA+1z4VKLzVYSs9groxU2nLlYGASKdYWw YxmA== 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=WFwcOu4xRxqbiyWXa2HmZCe+M5m6xHGIKM2VUv3lA68=; b=Ng3yz0mMcVVG9eQXDmd6UE35/dKn6h5GTQam+9833YEJxAmZgy9QT9g328hM7cRN7L IllmluQno1fB8c1ghJlC3IM5lGe//roq+FDXNAFjutKKe1ETckFj/LS23LHy2R4J+8Ls okRcHBNKys8SvWCh+sGZYo9kh8t3aUbc5J9LoYfpaSoyesX8q/2/73jb8J/uRFgITTk5 KOe9My3ry7JS5+EXgfiwOtrhQAm5293dchRKSwexVazHkCE7xc8soN1qSBwG1Lo5K1wY OJnFpRBHpICffIvry4ZguHnIUWT/FVQm0+AE2r6vjDDW0W5gyiE6TkK+/HRcB90czgFF wNRw== X-Gm-Message-State: AOAM533ch55zM4lI46RlVptMzTnHel+PMsruOoC5gGLK7N7FVBb4oG76 DnuAcOE+q1ZvWeL8aa0BxSwBxN4eKhzxSA== X-Google-Smtp-Source: ABdhPJwvlZUKLIfVdEW54lUuyI3plBCMSjQrlRQkqAbylOydJ4P3yo0Ic/olAm/RPikgOPXu8xb30w== X-Received: by 2002:a17:906:c301:: with SMTP id s1mr16943994ejz.382.1617991846722; Fri, 09 Apr 2021 11:10:46 -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 11:10:46 -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 2/5] tracing: Add "last_func_repeats" to struct trace_array Date: Fri, 9 Apr 2021 21:10:28 +0300 Message-Id: <20210409181031.26772-3-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 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 | 18 ++++++++++++++++++ 2 files changed, 19 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..1cd4da7ba769 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. @@ -358,8 +369,15 @@ struct trace_array { #ifdef CONFIG_TRACER_SNAPSHOT struct cond_snapshot *cond_snapshot; #endif + struct trace_func_repeats __percpu *last_func_repeats; }; +static inline struct trace_func_repeats __percpu * +tracer_alloc_func_repeats(struct trace_array *tr) +{ + return tr->last_func_repeats = alloc_percpu(struct trace_func_repeats); +} + enum { TRACE_ARRAY_FL_GLOBAL = (1 << 0) }; -- 2.25.1