Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932097Ab0DFV7R (ORCPT ); Tue, 6 Apr 2010 17:59:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:61942 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757450Ab0DFV7C (ORCPT ); Tue, 6 Apr 2010 17:59:02 -0400 From: Masami Hiramatsu Subject: [PATCH -tip v2 2/8] perf probe: Use the last field name as the argument name To: Ingo Molnar , lkml Cc: systemtap , DLE , Masami Hiramatsu , Ingo Molnar , Paul Mackerras , Arnaldo Carvalho de Melo , Peter Zijlstra , Mike Galbraith , Frederic Weisbecker Date: Tue, 06 Apr 2010 18:05:55 -0400 Message-ID: <20100406220555.13329.9419.stgit@localhost6.localdomain6> In-Reply-To: <20100406220542.13329.45837.stgit@localhost6.localdomain6> References: <20100406220542.13329.45837.stgit@localhost6.localdomain6> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2604 Lines: 63 Set the last field name to the argument name when the argument is refering a data-structure member. e.g. ./perf probe --add 'vfs_read file->f_mode' Add new event: probe:vfs_read (on vfs_read with f_mode=file->f_mode) This probe records file->f_mode, but the argument name becomes "f_mode". This enables perf-trace command to parse trace event format correctly. Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Frederic Weisbecker --- tools/perf/Documentation/perf-probe.txt | 2 +- tools/perf/util/probe-event.c | 4 ++++ 2 files changed, 5 insertions(+), 1 deletions(-) diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt index e36ed4d..441324f 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt @@ -87,7 +87,7 @@ Each probe argument follows below syntax. [NAME=]LOCALVAR|$retval|%REG|@SYMBOL -'NAME' specifies the name of this argument (optional). You can use the name of local variable, local data structure member (e.g. var->field, var.field2), or kprobe-tracer argument format (e.g. $retval, %ax, etc). +'NAME' specifies the name of this argument (optional). You can use the name of local variable, local data structure member (e.g. var->field, var.field2), or kprobe-tracer argument format (e.g. $retval, %ax, etc). Note that the name of this argument will be set as the last member name if you specify a local data structure member (e.g. field2 for 'var->field1.field2'.) LINE SYNTAX ----------- diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index ab6f53d..19de8b7 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -481,6 +481,10 @@ static void parse_perf_probe_arg(const char *str, struct perf_probe_arg *arg) } while (tmp); (*fieldp)->name = xstrdup(str); pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); + + /* If no name is specified, set the last field name */ + if (!arg->name) + arg->name = xstrdup((*fieldp)->name); } /* Parse perf-probe event command */ -- Masami Hiramatsu e-mail: mhiramat@redhat.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/