Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754201AbZLAAVB (ORCPT ); Mon, 30 Nov 2009 19:21:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752869AbZLAAU7 (ORCPT ); Mon, 30 Nov 2009 19:20:59 -0500 Received: from mx1.redhat.com ([209.132.183.28]:61860 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752470AbZLAAUy (ORCPT ); Mon, 30 Nov 2009 19:20:54 -0500 From: Masami Hiramatsu Subject: [PATCH -tip 9/9] perf probe: Simplify event naming To: Ingo Molnar , Frederic Weisbecker , lkml Cc: systemtap , DLE , Masami Hiramatsu , Ingo Molnar , Steven Rostedt , Jim Keniston , Ananth N Mavinakayanahalli , Christoph Hellwig , "Frank Ch. Eigler" , Frederic Weisbecker , Jason Baron , "K.Prasad" , Peter Zijlstra , Srikar Dronamraju , Arnaldo Carvalho de Melo Date: Mon, 30 Nov 2009 19:20:25 -0500 Message-ID: <20091201002024.10235.2353.stgit@harusame> In-Reply-To: <20091201001912.10235.79411.stgit@harusame> References: <20091201001912.10235.79411.stgit@harusame> 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: 4459 Lines: 145 Simplify event naming as _. Each event name is globally unique (group name is not checked). So, if there is schedule_0, next probe event on schedule() will be schedule_1. Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Steven Rostedt Cc: Jim Keniston Cc: Ananth N Mavinakayanahalli Cc: Christoph Hellwig Cc: Frank Ch. Eigler Cc: Frederic Weisbecker Cc: Jason Baron Cc: K.Prasad Cc: Peter Zijlstra Cc: Srikar Dronamraju Cc: Arnaldo Carvalho de Melo --- tools/perf/util/probe-event.c | 67 ++++++++++++++++++++++++++++++++--------- tools/perf/util/probe-event.h | 3 ++ 2 files changed, 56 insertions(+), 14 deletions(-) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 7f4f288..e42f3ac 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -403,6 +403,29 @@ void show_perf_probe_events(void) strlist__delete(rawlist); } +/* Get current perf-probe event names */ +static struct strlist *get_perf_event_names(int fd) +{ + unsigned int i; + char *group, *event; + struct strlist *sl, *rawlist; + struct str_node *ent; + + rawlist = get_trace_kprobe_event_rawlist(fd); + + sl = strlist__new(false, NULL); + for (i = 0; i < strlist__nr_entries(rawlist); i++) { + ent = strlist__entry(rawlist, i); + parse_trace_kprobe_event(ent->s, &group, &event, NULL); + strlist__add(sl, event); + free(group); + } + + strlist__delete(rawlist); + + return sl; +} + static int write_trace_kprobe_event(int fd, const char *buf) { int ret; @@ -416,30 +439,46 @@ static int write_trace_kprobe_event(int fd, const char *buf) return ret; } +static void get_new_event_name(char *buf, size_t len, const char *base, + struct strlist *namelist) +{ + int i, ret; + for (i = 0; i < MAX_EVENT_INDEX; i++) { + ret = e_snprintf(buf, len, "%s_%d", base, i); + if (ret < 0) + die("snprintf() failed: %s", strerror(-ret)); + if (!strlist__has_entry(namelist, buf)) + break; + } + if (i == MAX_EVENT_INDEX) + die("Too many events are on the same function."); +} + void add_trace_kprobe_events(struct probe_point *probes, int nr_probes) { int i, j, fd; struct probe_point *pp; char buf[MAX_CMDLEN]; + char event[64]; + struct strlist *namelist; - fd = open_kprobe_events(O_WRONLY, O_APPEND); + fd = open_kprobe_events(O_RDWR, O_APPEND); + /* Get current event names */ + namelist = get_perf_event_names(fd); for (j = 0; j < nr_probes; j++) { pp = probes + j; - if (pp->found == 1) { - snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x %s\n", - pp->retprobe ? 'r' : 'p', PERFPROBE_GROUP, - pp->function, pp->offset, pp->probes[0]); + for (i = 0; i < pp->found; i++) { + /* Get an unused new event name */ + get_new_event_name(event, 64, pp->function, namelist); + snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n", + pp->retprobe ? 'r' : 'p', + PERFPROBE_GROUP, event, + pp->probes[i]); write_trace_kprobe_event(fd, buf); - } else - for (i = 0; i < pp->found; i++) { - snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x_%d %s\n", - pp->retprobe ? 'r' : 'p', - PERFPROBE_GROUP, - pp->function, pp->offset, i, - pp->probes[i]); - write_trace_kprobe_event(fd, buf); - } + /* Add added event name to namelist */ + strlist__add(namelist, event); + } } close(fd); } diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h index 88db7d1..0c6fe56 100644 --- a/tools/perf/util/probe-event.h +++ b/tools/perf/util/probe-event.h @@ -12,4 +12,7 @@ extern int synthesize_trace_kprobe_event(struct probe_point *pp); extern void add_trace_kprobe_events(struct probe_point *probes, int nr_probes); extern void show_perf_probe_events(void); +/* Maximum index number of event-name postfix */ +#define MAX_EVENT_INDEX 1024 + #endif /*_PROBE_EVENT_H */ -- Masami Hiramatsu Software Engineer Hitachi Computer Products (America), Inc. Software Solutions Division 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/