From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755536AbbBTWTV (ORCPT ); Fri, 20 Feb 2015 17:19:21 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51802 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755266AbbBTWTR (ORCPT ); Fri, 20 Feb 2015 17:19:17 -0500 From: Jiri Olsa To: linux-kernel@vger.kernel.org Cc: Wang Nan , Arnaldo Carvalho de Melo , David Ahern , Frederic Weisbecker , Jeremie Galarneau , Jiri Olsa , Namhyung Kim , Paul Mackerras , Peter Zijlstra , Sebastian Andrzej Siewior , Tom Zanussi Subject: [PATCH 10/11] perf data: Fix duplicate field names and avoid reserved keywords Date: Fri, 20 Feb 2015 23:17:07 +0100 Message-Id: <1424470628-5969-11-git-send-email-jolsa@kernel.org> In-Reply-To: <1424470628-5969-1-git-send-email-jolsa@kernel.org> References: <1424470628-5969-1-git-send-email-jolsa@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wang Nan Some parameters of syscall tracepoints named as 'nr', 'event', etc. When dealing with them, perf convert to ctf meets some problem: 1. If a parameter with name 'nr', it will duplicate syscall's common field 'nr'. One such syscall is io_submit(). 2. If a parameter with name 'event', it is denied to be inserted because 'event' is a babeltrace keywork. One such syscall is epoll_ctl. This patch appends '_dupl_X' suffix to avoid problem 1, prepend a '_' prefix to avoid problem 2. Signed-off-by: Wang Nan Cc: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Frederic Weisbecker Cc: Jeremie Galarneau Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sebastian Andrzej Siewior Cc: Tom Zanussi [ changed to use format_file::alias ] Signed-off-by: Jiri Olsa --- tools/perf/util/data-convert-bt.c | 85 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 81 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c index ddecce88bf6d..95de04c31a80 100644 --- a/tools/perf/util/data-convert-bt.c +++ b/tools/perf/util/data-convert-bt.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include "asm/bug.h" @@ -184,6 +185,7 @@ static int add_tracepoint_field_value(struct ctf_writer *cw, unsigned int len; int ret; + name = fmtf->alias ? (const char *)fmtf->alias : fmtf->name; offset = fmtf->offset; len = fmtf->size; if (flags & FIELD_IS_STRING) @@ -567,6 +569,81 @@ static int process_sample_event(struct perf_tool *tool, return cs ? 0 : -1; } +/* If dup < 0, add a prefix. Else, add _dupl_X suffix. */ +static char *change_name(char *name, char *orig_name, int dup) +{ + char *new_name = NULL; + size_t len; + + if (!name) + name = orig_name; + + if (dup >= 10) + goto out; + /* + * Add '_' prefix to potential keywork. According to + * Mathieu Desnoyers (https://lkml.org/lkml/2015/1/23/652), + * futher CTF spec updating may require us to use '$'. + */ + if (dup < 0) + len = strlen(name) + sizeof("_"); + else + len = strlen(orig_name) + sizeof("_dupl_X"); + + new_name = malloc(len); + if (!new_name) + goto out; + + if (dup < 0) + snprintf(new_name, len, "_%s", name); + else + snprintf(new_name, len, "%s_dupl_%d", orig_name, dup); + +out: + if (name != orig_name) + free(name); + return new_name; +} + +static int event_class_add_field(struct bt_ctf_event_class *event_class, + struct bt_ctf_field_type *type, + struct format_field *field) +{ + struct bt_ctf_field_type *t = NULL; + char *name; + int dup = 1; + int ret; + + if (field->alias) + return bt_ctf_event_class_add_field(event_class, type, + (char *)field->alias); + + name = field->name; + + /* If 'name' is a keywork, add prefix. */ + if (bt_ctf_validate_identifier(name)) + name = change_name(name, field->name, -1); + + if (!name) { + pr_err("Failed to fix invalid identifier."); + return -1; + } + while ((t = bt_ctf_event_class_get_field_by_name(event_class, name))) { + bt_ctf_field_type_put(t); + name = change_name(name, field->name, dup++); + if (!name) { + pr_err("Failed to create dup name for '%s'\n", field->name); + return -1; + } + } + + ret = bt_ctf_event_class_add_field(event_class, type, name); + if (!ret) + field->alias = name; + + return ret; +} + static int add_tracepoint_fields_types(struct ctf_writer *cw, struct format_field *fields, struct bt_ctf_event_class *event_class) @@ -595,14 +672,14 @@ static int add_tracepoint_fields_types(struct ctf_writer *cw, if (flags & FIELD_IS_ARRAY) type = bt_ctf_field_type_array_create(type, field->arraylen); - ret = bt_ctf_event_class_add_field(event_class, type, - field->name); + ret = event_class_add_field(event_class, type, field); if (flags & FIELD_IS_ARRAY) bt_ctf_field_type_put(type); if (ret) { - pr_err("Failed to add field '%s\n", field->name); + pr_err("Failed to add field '%s': %d\n", + field->name, ret); return -1; } } @@ -646,7 +723,7 @@ static int add_generic_types(struct ctf_writer *cw, struct perf_evsel *evsel, do { \ pr2(" field '%s'\n", n); \ if (bt_ctf_event_class_add_field(cl, t, n)) { \ - pr_err("Failed to add field '%s;\n", n); \ + pr_err("Failed to add field '%s';\n", n); \ return -1; \ } \ } while (0) -- 1.9.3