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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 F1609C7618F for ; Mon, 15 Jul 2019 21:12:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C3F1521721 for ; Mon, 15 Jul 2019 21:12:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563225163; bh=U9IEyP91JQxsxqzwUvL8EnXtTjjUlLnqw2mG8cQ2A/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yMRHP3G4rGuYzeKnxtKIuOnO+XxtD9f1IBKlV9DeVBCLx63lxag/IdaK4eOAvejnv RPnS0Cn8PtteiuHu2fp14U4OZGsGGPhkq8LjLHZF9fCoUquHeUmuTj1AXa/XDC/hhE kcMcV7y4KDoOgTjdjLxb8Ivn1a/7th6eU16xN6wQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732895AbfGOVMm (ORCPT ); Mon, 15 Jul 2019 17:12:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:43500 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730207AbfGOVMl (ORCPT ); Mon, 15 Jul 2019 17:12:41 -0400 Received: from quaco.ghostprotocols.net (179-240-129-12.3g.claro.net.br [179.240.129.12]) (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 D31932173C; Mon, 15 Jul 2019 21:12:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563225160; bh=U9IEyP91JQxsxqzwUvL8EnXtTjjUlLnqw2mG8cQ2A/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CawXqTa9mSNPqKVttactcNuZybLVW6+B01ZTIjBR/nrfLkXYSnBvgC3gilt7xNTqB 6eDwviS4iRRmFBFZPDX+JOqhxK35Tr3dzBODlp+WR8w0+MprQx4K810inaVP5ElDpA U7FIIR+0tLBCb/dmxS3KtZQfp8EECaBhaDroBUZU= From: Arnaldo Carvalho de Melo To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Adrian Hunter , Jiri Olsa , Arnaldo Carvalho de Melo Subject: [PATCH 05/28] perf db-export: Rename db_export__comm() to db_export__exec_comm() Date: Mon, 15 Jul 2019 18:11:37 -0300 Message-Id: <20190715211200.10984-6-acme@kernel.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190715211200.10984-1-acme@kernel.org> References: <20190715211200.10984-1-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: Adrian Hunter Rename db_export__comm() to db_export__exec_comm() to better reflect what it does and add explanatory comments. Signed-off-by: Adrian Hunter Cc: Jiri Olsa Link: http://lkml.kernel.org/r/20190710085810.1650-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/db-export.c | 22 +++++++++++++++++++--- tools/perf/util/db-export.h | 4 ++-- 2 files changed, 21 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c index 34cf197fe74f..8fab57f90cbc 100644 --- a/tools/perf/util/db-export.c +++ b/tools/perf/util/db-export.c @@ -105,8 +105,14 @@ int db_export__thread(struct db_export *dbe, struct thread *thread, return err; } -int db_export__comm(struct db_export *dbe, struct comm *comm, - struct thread *main_thread) +/* + * Export the "exec" comm. The "exec" comm is the program / application command + * name at the time it first executes. It is used to group threads for the same + * program. Note that the main thread pid (or thread group id tgid) cannot be + * used because it does not change when a new program is exec'ed. + */ +int db_export__exec_comm(struct db_export *dbe, struct comm *comm, + struct thread *main_thread) { int err; @@ -121,6 +127,16 @@ int db_export__comm(struct db_export *dbe, struct comm *comm, return err; } + /* + * Record the main thread for this comm. Note that the main thread can + * have many "exec" comms because there will be a new one every time it + * exec's. An "exec" comm however will only ever have 1 main thread. + * That is different to any other threads for that same program because + * exec() will effectively kill them, so the relationship between the + * "exec" comm and non-main threads is 1-to-1. That is why + * db_export__comm_thread() is called here for the main thread, but it + * is called for non-main threads when they are exported. + */ return db_export__comm_thread(dbe, comm, main_thread); } @@ -313,7 +329,7 @@ int db_export__sample(struct db_export *dbe, union perf_event *event, goto out_put; if (comm) { - err = db_export__comm(dbe, comm, main_thread); + err = db_export__exec_comm(dbe, comm, main_thread); if (err) goto out_put; es.comm_db_id = comm->db_id; diff --git a/tools/perf/util/db-export.h b/tools/perf/util/db-export.h index 261cfece8dee..148a657b1887 100644 --- a/tools/perf/util/db-export.h +++ b/tools/perf/util/db-export.h @@ -76,8 +76,8 @@ int db_export__evsel(struct db_export *dbe, struct perf_evsel *evsel); int db_export__machine(struct db_export *dbe, struct machine *machine); int db_export__thread(struct db_export *dbe, struct thread *thread, struct machine *machine, struct comm *comm); -int db_export__comm(struct db_export *dbe, struct comm *comm, - struct thread *main_thread); +int db_export__exec_comm(struct db_export *dbe, struct comm *comm, + struct thread *main_thread); int db_export__comm_thread(struct db_export *dbe, struct comm *comm, struct thread *thread); int db_export__dso(struct db_export *dbe, struct dso *dso, -- 2.21.0