From patchwork Mon Dec 2 10:17:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 11268939 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 500BB109A for ; Mon, 2 Dec 2019 10:17:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2E3C7217D9 for ; Mon, 2 Dec 2019 10:17:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575281844; bh=N2bOqK08ug6H1YZmw+OlkHkSLCiZT7nKPHpqdeNdqwA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=o2fkXXV4ngv/5JyGdZ8nMguuEd6QHk3PSjNe91GcgZTuPrcDL8Awkm9BGHnECZpF6 7Wvfeefn+Zm6R9Z8Ji9M2eHgyad4lDH3p8XSaSd4NH4NzaIPJNCche8jVBDy0Dl26C P4XVHBBuTW+M8DjWf072XIOwrL+hS5tVsLiq+Ra8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727479AbfLBKRU (ORCPT ); Mon, 2 Dec 2019 05:17:20 -0500 Received: from mail.kernel.org ([198.145.29.99]:33556 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727368AbfLBKRU (ORCPT ); Mon, 2 Dec 2019 05:17:20 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EF267215E5; Mon, 2 Dec 2019 10:17:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575281839; bh=N2bOqK08ug6H1YZmw+OlkHkSLCiZT7nKPHpqdeNdqwA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hd9SRW4J1o0g9w8lnNHTWVXj76+Yg/alCed/P6WMhgP61/7O8xAv7yn1cRRjCj6kM aW3XH/wqm7wKg3F80blnLmUjWJS4WsQ7XvTrKrbaD2dzQDHzm7FWVFk6PQ5HV7jG7e 0l4G2JOYkJnnHpQOyJ9QLMZh7p59ofP71MGF+Saw= From: Masami Hiramatsu To: Steven Rostedt , Frank Rowand Cc: Ingo Molnar , Namhyung Kim , Tim Bird , Jiri Olsa , Arnaldo Carvalho de Melo , Tom Zanussi , Rob Herring , Andrew Morton , Thomas Gleixner , Greg Kroah-Hartman , Alexey Dobriyan , Jonathan Corbet , Linus Torvalds , linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v4 21/22] tracing/boot: Add function tracer filter options Date: Mon, 2 Dec 2019 19:17:13 +0900 Message-Id: <157528183338.22451.2725921016653118215.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <157528159833.22451.14878731055438721716.stgit@devnote2> References: <157528159833.22451.14878731055438721716.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Add below function-tracer filter options to boot-time tracing. - ftrace.[instance.INSTANCE.]ftrace.filters This will take an array of tracing function filter rules - ftrace.[instance.INSTANCE.]ftrace.notraces This will take an array of NON-tracing function filter rules Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_boot.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c index 81d923c16a4d..57274b9b3718 100644 --- a/kernel/trace/trace_boot.c +++ b/kernel/trace/trace_boot.c @@ -244,11 +244,51 @@ trace_boot_init_events(struct trace_array *tr, struct xbc_node *node) #define trace_boot_init_events(tr, node) do {} while (0) #endif +#ifdef CONFIG_FUNCTION_TRACER +extern bool ftrace_filter_param __initdata; +extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, + int len, int reset); +extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, + int len, int reset); +static void __init +trace_boot_set_ftrace_filter(struct trace_array *tr, struct xbc_node *node) +{ + struct xbc_node *anode; + const char *p; + char *q; + + xbc_node_for_each_array_value(node, "ftrace.filters", anode, p) { + q = kstrdup(p, GFP_KERNEL); + if (!q) + return; + if (ftrace_set_filter(tr->ops, q, strlen(q), 0) < 0) + pr_err("Failed to add %s to ftrace filter\n", p); + else + ftrace_filter_param = true; + kfree(q); + } + xbc_node_for_each_array_value(node, "ftrace.notraces", anode, p) { + q = kstrdup(p, GFP_KERNEL); + if (!q) + return; + if (ftrace_set_notrace(tr->ops, q, strlen(q), 0) < 0) + pr_err("Failed to add %s to ftrace filter\n", p); + else + ftrace_filter_param = true; + kfree(q); + } +} +#else +#define trace_boot_set_ftrace_filter(tr, node) do {} while (0) +#endif + static void __init trace_boot_enable_tracer(struct trace_array *tr, struct xbc_node *node) { const char *p; + trace_boot_set_ftrace_filter(tr, node); + p = xbc_node_find_value(node, "tracer", NULL); if (p && *p != '\0') { if (tracing_set_tracer(tr, p) < 0)