Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755358AbbHJG0c (ORCPT ); Mon, 10 Aug 2015 02:26:32 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:47391 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753174AbbHJGRQ (ORCPT ); Mon, 10 Aug 2015 02:17:16 -0400 From: Wang Nan To: , CC: , , , , , , , , , , , , Subject: [PATCH 10/27] perf tools: Suppress probing messages when probing by BPF loading Date: Mon, 10 Aug 2015 06:15:52 +0000 Message-ID: <1439187369-66492-11-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1439187369-66492-1-git-send-email-wangnan0@huawei.com> References: <1439187369-66492-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5131 Lines: 156 This patch suppresses message output by add_perf_probe_events() and del_perf_probe_events() if they are triggered by BPF loading. Before this patch, when using 'perf record' with BPF object/source as event selector, following message will be output: Added new event: perf_bpf_probe:lock_page_ret (on __lock_page%return) You can now use it in all perf tools, such as: perf record -e perf_bpf_probe:lock_page_ret -aR sleep 1 ... Removed event: perf_bpf_probe:lock_page_ret Which is misleading, especially 'use it in all perf tools' because they will be removed after 'pref record' exit. In this patch, a 'silent' field is appended into probe_conf to control output. bpf__{,un}probe() set it to true when calling {add,del}_perf_probe_events(). Signed-off-by: Wang Nan --- tools/perf/util/bpf-loader.c | 6 ++++++ tools/perf/util/probe-event.c | 17 ++++++++++++----- tools/perf/util/probe-event.h | 1 + tools/perf/util/probe-file.c | 5 ++++- 4 files changed, 23 insertions(+), 6 deletions(-) diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c index 909e4c0..ade8df7 100644 --- a/tools/perf/util/bpf-loader.c +++ b/tools/perf/util/bpf-loader.c @@ -188,6 +188,7 @@ static bool is_probed; int bpf__unprobe(void) { struct strfilter *delfilter; + bool old_silent = probe_conf.silent; int ret; if (!is_probed) @@ -199,7 +200,9 @@ int bpf__unprobe(void) return -ENOMEM; } + probe_conf.silent = true; ret = del_perf_probe_events(delfilter); + probe_conf.silent = old_silent; strfilter__delete(delfilter); if (ret < 0 && is_probed) pr_debug("Error: failed to delete events: %s\n", @@ -215,6 +218,7 @@ int bpf__probe(void) struct bpf_object *obj, *tmp; struct bpf_program *prog; struct perf_probe_event *pevs; + bool old_silent = probe_conf.silent; pevs = calloc(MAX_PROBES, sizeof(pevs[0])); if (!pevs) @@ -235,9 +239,11 @@ int bpf__probe(void) } } + probe_conf.silent = true; probe_conf.max_probes = MAX_PROBES; /* Let add_perf_probe_events generates probe_trace_event (tevs) */ err = add_perf_probe_events(pevs, nr_events, false); + probe_conf.silent = old_silent; /* add_perf_probe_events return negative when fail */ if (err < 0) { diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 1b6618c..597e30f 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -52,7 +52,9 @@ #define PERFPROBE_GROUP "probe" bool probe_event_dry_run; /* Dry run flag */ -struct probe_conf probe_conf; +struct probe_conf probe_conf = { + .silent = false, +}; #define semantic_error(msg ...) pr_err("Semantic error :" msg) @@ -2132,10 +2134,12 @@ static int show_perf_probe_event(const char *group, const char *event, ret = perf_probe_event__sprintf(group, event, pev, module, &buf); if (ret >= 0) { - if (use_stdout) + if (use_stdout && !probe_conf.silent) printf("%s\n", buf.buf); - else + else if (!probe_conf.silent) pr_info("%s\n", buf.buf); + else + pr_debug("%s\n", buf.buf); } strbuf_release(&buf); @@ -2356,7 +2360,10 @@ static int __add_probe_trace_events(struct perf_probe_event *pev, } ret = 0; - pr_info("Added new event%s\n", (ntevs > 1) ? "s:" : ":"); + if (!probe_conf.silent) + pr_info("Added new event%s\n", (ntevs > 1) ? "s:" : ":"); + else + pr_debug("Added new event%s\n", (ntevs > 1) ? "s:" : ":"); for (i = 0; i < ntevs; i++) { tev = &tevs[i]; /* Skip if the symbol is out of .text or blacklisted */ @@ -2392,7 +2399,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev, warn_uprobe_event_compat(tev); /* Note that it is possible to skip all events because of blacklist */ - if (ret >= 0 && event) { + if (ret >= 0 && event && !probe_conf.silent) { /* Show how to use the event. */ pr_info("\nYou can now use it in all perf tools, such as:\n\n"); pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event); diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h index 5db0f20..ba981c5 100644 --- a/tools/perf/util/probe-event.h +++ b/tools/perf/util/probe-event.h @@ -13,6 +13,7 @@ struct probe_conf { bool force_add; bool no_inlines; int max_probes; + bool silent; }; extern struct probe_conf probe_conf; extern bool probe_event_dry_run; diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c index bbb2437..db7bd4c 100644 --- a/tools/perf/util/probe-file.c +++ b/tools/perf/util/probe-file.c @@ -267,7 +267,10 @@ static int __del_trace_probe_event(int fd, struct str_node *ent) goto error; } - pr_info("Removed event: %s\n", ent->s); + if (!probe_conf.silent) + pr_info("Removed event: %s\n", ent->s); + else + pr_debug("Removed event: %s\n", ent->s); return 0; error: pr_warning("Failed to delete event: %s\n", -- 1.8.3.4 -- 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/