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=-13.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 A9151C43387 for ; Tue, 8 Jan 2019 19:59:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 705F1214C6 for ; Tue, 8 Jan 2019 19:59:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546977585; bh=uBNUvjkMY3Cs9U5Bt+ExJ49E8ntdzD3+JZ6nIl2lj1M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=b41HdL7KFYtRq2jU78rgfTYhGWzJP3bTdxj+y48S255eIaLuzj9ga6WWNvj+koE4g 99YzRevhS5k28kaQPiTSLhr4cyTblySME/w3CHqcyLAEE1e22QZEaZSofBMZjoUcAO 2PVSMLz4hVSdyoxQnQ1HA62DCVc9p94/OxuS2mLU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732938AbfAHT7o (ORCPT ); Tue, 8 Jan 2019 14:59:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:56640 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732915AbfAHT7l (ORCPT ); Tue, 8 Jan 2019 14:59:41 -0500 Received: from quaco.ghostprotocols.net (unknown [177.135.9.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9D70C2176F; Tue, 8 Jan 2019 19:59:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546977580; bh=uBNUvjkMY3Cs9U5Bt+ExJ49E8ntdzD3+JZ6nIl2lj1M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aaaah+QSKhrQ4ERn36Y00b1cVmdf+Qn5KrndEwNZGu1I+VgDg+M8hyI7UObDX8wdv yZWvdomS5SkpFn/6scf1uajwiOEsMc8tn1L9mf+aoBkO/ceVz80ekt7c/jmzHLeQFQ ZNSAb45iNnNNuROp+3cHKDv5Bk8kGFuYkD/r38yY= From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Tzvetomir Stoyanov , Andrew Morton , Jiri Olsa , Namhyung Kim , Steven Rostedt , Arnaldo Carvalho de Melo Subject: [PATCH 05/16] tools lib traceevent: Introduce new libtracevent API: tep_override_comm() Date: Tue, 8 Jan 2019 16:58:59 -0300 Message-Id: <20190108195910.17726-6-acme@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190108195910.17726-1-acme@kernel.org> References: <20190108195910.17726-1-acme@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tzvetomir Stoyanov This patch adds a new API of tracevent library: tep_override_comm() It registers a pid / command mapping. If a mapping with the same pid already exists, the entry is updated with the new command. Signed-off-by: Tzvetomir Stoyanov Cc: Andrew Morton Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lkml.kernel.org/r/20181130154648.038915912@goodmis.org Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/traceevent/event-parse.c | 69 +++++++++++++++++++++++------- tools/lib/traceevent/event-parse.h | 1 + 2 files changed, 55 insertions(+), 15 deletions(-) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index 69a96e39f0ab..156e513074b2 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -232,11 +232,13 @@ int tep_pid_is_registered(struct tep_handle *pevent, int pid) * we must add this pid. This is much slower than when cmdlines * are added before the array is initialized. */ -static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid) +static int add_new_comm(struct tep_handle *pevent, + const char *comm, int pid, bool override) { struct cmdline *cmdlines = pevent->cmdlines; - const struct cmdline *cmdline; + struct cmdline *cmdline; struct cmdline key; + char *new_comm; if (!pid) return 0; @@ -247,8 +249,19 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid) cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count, sizeof(*pevent->cmdlines), cmdline_cmp); if (cmdline) { - errno = EEXIST; - return -1; + if (!override) { + errno = EEXIST; + return -1; + } + new_comm = strdup(comm); + if (!new_comm) { + errno = ENOMEM; + return -1; + } + free(cmdline->comm); + cmdline->comm = new_comm; + + return 0; } cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1)); @@ -275,21 +288,13 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid) return 0; } -/** - * tep_register_comm - register a pid / comm mapping - * @pevent: handle for the pevent - * @comm: the command line to register - * @pid: the pid to map the command line to - * - * This adds a mapping to search for command line names with - * a given pid. The comm is duplicated. - */ -int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid) +static int _tep_register_comm(struct tep_handle *pevent, + const char *comm, int pid, bool override) { struct cmdline_list *item; if (pevent->cmdlines) - return add_new_comm(pevent, comm, pid); + return add_new_comm(pevent, comm, pid, override); item = malloc(sizeof(*item)); if (!item) @@ -312,6 +317,40 @@ int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid) return 0; } +/** + * tep_register_comm - register a pid / comm mapping + * @pevent: handle for the pevent + * @comm: the command line to register + * @pid: the pid to map the command line to + * + * This adds a mapping to search for command line names with + * a given pid. The comm is duplicated. If a command with the same pid + * already exist, -1 is returned and errno is set to EEXIST + */ +int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid) +{ + return _tep_register_comm(pevent, comm, pid, false); +} + +/** + * tep_override_comm - register a pid / comm mapping + * @pevent: handle for the pevent + * @comm: the command line to register + * @pid: the pid to map the command line to + * + * This adds a mapping to search for command line names with + * a given pid. The comm is duplicated. If a command with the same pid + * already exist, the command string is udapted with the new one + */ +int tep_override_comm(struct tep_handle *pevent, const char *comm, int pid) +{ + if (!pevent->cmdlines && cmdline_init(pevent)) { + errno = ENOMEM; + return -1; + } + return _tep_register_comm(pevent, comm, pid, true); +} + int tep_register_trace_clock(struct tep_handle *pevent, const char *trace_clock) { pevent->trace_clock = strdup(trace_clock); diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h index 35d37087d3c5..e6f4249910e6 100644 --- a/tools/lib/traceevent/event-parse.h +++ b/tools/lib/traceevent/event-parse.h @@ -432,6 +432,7 @@ int tep_set_function_resolver(struct tep_handle *pevent, tep_func_resolver_t *func, void *priv); void tep_reset_function_resolver(struct tep_handle *pevent); int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid); +int tep_override_comm(struct tep_handle *pevent, const char *comm, int pid); int tep_register_trace_clock(struct tep_handle *pevent, const char *trace_clock); int tep_register_function(struct tep_handle *pevent, char *name, unsigned long long addr, char *mod); -- 2.20.1