From patchwork Fri Mar 15 08:37:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tzvetomir Stoyanov X-Patchwork-Id: 10854275 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D534A1575 for ; Fri, 15 Mar 2019 08:38:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C0CF52A88D for ; Fri, 15 Mar 2019 08:38:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4F072A8BA; Fri, 15 Mar 2019 08:38:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 40A7D2A88D for ; Fri, 15 Mar 2019 08:38:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727291AbfCOIiA (ORCPT ); Fri, 15 Mar 2019 04:38:00 -0400 Received: from mail-wm1-f66.google.com ([209.85.128.66]:55909 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727058AbfCOIh7 (ORCPT ); Fri, 15 Mar 2019 04:37:59 -0400 Received: by mail-wm1-f66.google.com with SMTP id 4so5562137wmf.5 for ; Fri, 15 Mar 2019 01:37:58 -0700 (PDT) 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=/UnSjgn063r718kUxw+hYTPaixZKeywUhQaFk7tTPRA=; b=mlG6W34ZKlRTNZjNv+nDCFwxwiLvLnB4yCf68JFl3Zbta55QimwkNViYuBHhHoBUEw Xg+eyIYfovLIxYSZX6+tCb8EaRHtHyd69zFxopHpKvPBm7f5RrEJRg3G8dileK3iogNj 8VdVZ9VZvmMEeIGQI4EjkYiSYi33nnkt3Mn8oDpaD7VQb9qxQTfPq7IZe+9NJvthCru0 C8MH5YG+OeFC3Owtq8TLNHihJHdgAjsOKgiyW23seldu+tJf9q4+01irJecBjt0EBaIv ALmXAdjTvy5gPNTa6IeQ2VeEOCgIucawZ80CUnIjVDEgrldihnN9McN2RMKH0wnAuV49 vKHw== X-Gm-Message-State: APjAAAWbw2LC9z1l7EX9YW/2MKNHzfsyQDguO96GTP9tMpPoEQZ4bNVy Ne7s8WCtwbSfrbyoGpThNQ73inUZ X-Google-Smtp-Source: APXvYqw+xURQJaZ/ARpLT9i9mNIGa/BunMN0A4o3yrBSA/G5bQig9tyhpSAPugcHg23ujlqLzY/2mg== X-Received: by 2002:a1c:dc85:: with SMTP id t127mr1170787wmg.136.1552639077514; Fri, 15 Mar 2019 01:37:57 -0700 (PDT) Received: from oberon.eng.vmware.com ([146.247.46.5]) by smtp.gmail.com with ESMTPSA id o5sm979395wmh.12.2019.03.15.01.37.56 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 15 Mar 2019 01:37:56 -0700 (PDT) From: Tzvetomir Stoyanov To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v6 1/9] trace-cmd: Implemented new lib API: tracecmd_local_events_system() Date: Fri, 15 Mar 2019 10:37:46 +0200 Message-Id: <20190315083754.27532-2-tstoyanov@vmware.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190315083754.27532-1-tstoyanov@vmware.com> References: <20190315083754.27532-1-tstoyanov@vmware.com> MIME-Version: 1.0 Sender: linux-trace-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The new tracecmd lib API tracecmd_local_events_system() creates a tep handler and initializes it with the events of the specified subsystems. Signed-off-by: Tzvetomir Stoyanov --- include/trace-cmd/trace-cmd.h | 2 + lib/trace-cmd/trace-util.c | 95 ++++++++++++++++++++++++----------- 2 files changed, 67 insertions(+), 30 deletions(-) diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h index 27ba89d..21f83e2 100644 --- a/include/trace-cmd/trace-cmd.h +++ b/include/trace-cmd/trace-cmd.h @@ -32,6 +32,8 @@ void tracecmd_unload_plugins(struct tep_plugin_list *list, struct tep_handle *pe char **tracecmd_event_systems(const char *tracing_dir); char **tracecmd_system_events(const char *tracing_dir, const char *system); struct tep_handle *tracecmd_local_events(const char *tracing_dir); +struct tep_handle *tracecmd_local_events_system(const char *tracing_dir, + const char * const *sys_names); int tracecmd_fill_local_events(const char *tracing_dir, struct tep_handle *pevent); char **tracecmd_local_plugins(const char *tracing_dir); diff --git a/lib/trace-cmd/trace-util.c b/lib/trace-cmd/trace-util.c index b5aea39..ca32fcf 100644 --- a/lib/trace-cmd/trace-util.c +++ b/lib/trace-cmd/trace-util.c @@ -1119,43 +1119,25 @@ static int read_header(struct tep_handle *pevent, const char *events_dir) return ret; } -/** - * tracecmd_local_events - create a pevent from the events on system - * @tracing_dir: The directory that contains the events. - * - * Returns a pevent structure that contains the pevents local to - * the system. - */ -struct tep_handle *tracecmd_local_events(const char *tracing_dir) +static bool contains(const char *name, const char * const *names) { - struct tep_handle *pevent = NULL; - - pevent = tep_alloc(); - if (!pevent) - return NULL; - - if (tracecmd_fill_local_events(tracing_dir, pevent)) { - tep_free(pevent); - pevent = NULL; - } - - return pevent; + if (!names) + return false; + for (; *names; names++) + if (strcmp(name, *names) == 0) + return true; + return false; } -/** - * tracecmd_fill_local_events - Fill a pevent with the events on system - * @tracing_dir: The directory that contains the events. - * @pevent: Allocated pevent which will be filled - * - * Returns whether the operation succeeded - */ -int tracecmd_fill_local_events(const char *tracing_dir, struct tep_handle *pevent) +static int tracecmd_fill_local_events_system(const char *tracing_dir, + struct tep_handle *pevent, + const char * const *sys_names) { + int ret, failure = 0; struct dirent *dent; char *events_dir; struct stat st; DIR *dir; - int ret, failure = 0; if (!tracing_dir) return -1; @@ -1189,7 +1171,8 @@ int tracecmd_fill_local_events(const char *tracing_dir, struct tep_handle *peven if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0) continue; - + if (sys_names && !contains(name, sys_names)) + continue; sys = append_file(events_dir, name); ret = stat(sys, &st); if (ret < 0 || !S_ISDIR(st.st_mode)) { @@ -1217,6 +1200,58 @@ int tracecmd_fill_local_events(const char *tracing_dir, struct tep_handle *peven return ret; } +/** + * tracecmd_local_events_system - create a tep from the events of the specified subsystem. + * + * @tracing_dir: The directory that contains the events. + * @sys_name: Array of system names, to load the events from. + * The last element from the array must be NULL + * + * Returns a tep structure that contains the tep local to + * the system. + */ +struct tep_handle *tracecmd_local_events_system(const char *tracing_dir, + const char * const *sys_names) +{ + struct tep_handle *tep = NULL; + + tep = tep_alloc(); + if (!tep) + return NULL; + + if (tracecmd_fill_local_events_system(tracing_dir, tep, sys_names)) { + tep_free(tep); + tep = NULL; + } + + return tep; +} + +/** + * tracecmd_local_events - create a pevent from the events on system + * @tracing_dir: The directory that contains the events. + * + * Returns a pevent structure that contains the pevents local to + * the system. + */ +struct tep_handle *tracecmd_local_events(const char *tracing_dir) +{ + return tracecmd_local_events_system(tracing_dir, NULL); +} + +/** + * tracecmd_fill_local_events - Fill a pevent with the events on system + * @tracing_dir: The directory that contains the events. + * @pevent: Allocated pevent which will be filled + * + * Returns whether the operation succeeded + */ +int tracecmd_fill_local_events(const char *tracing_dir, + struct tep_handle *pevent) +{ + return tracecmd_fill_local_events_system(tracing_dir, pevent, NULL); +} + /** * tracecmd_local_plugins - returns an array of available tracer plugins * @tracing_dir: The directory that contains the tracing directory