From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760168AbcAKNt6 (ORCPT ); Mon, 11 Jan 2016 08:49:58 -0500 Received: from szxga02-in.huawei.com ([119.145.14.65]:11633 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760109AbcAKNtz (ORCPT ); Mon, 11 Jan 2016 08:49:55 -0500 From: Wang Nan To: CC: , , , , , Wang Nan , He Kuang , "Arnaldo Carvalho de Melo" , Jiri Olsa , Masami Hiramatsu , Namhyung Kim Subject: [PATCH 52/53] perf record: Toggle tailsize ring buffer for reading Date: Mon, 11 Jan 2016 13:48:43 +0000 Message-ID: <1452520124-2073-53-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1452520124-2073-1-git-send-email-wangnan0@huawei.com> References: <1452520124-2073-1-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 X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.5693B2F7.000D,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: fc66c8bebac95e97671c480cd5b0268b Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Toggel tailsize_evt_stopped director after receiving done or switch output. After this patch it is possible to trigger a dump use SIGUSR2 when something happen. Signed-off-by: Wang Nan Signed-off-by: He Kuang Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Zefan Li Cc: pi3orama@163.com --- tools/perf/builtin-record.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 6c8905b..6ec0529 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -591,6 +591,26 @@ static void record__init_features(struct record *rec) } static void +record__toggle_tailsize_evsels(struct record *rec, bool stop) +{ + struct perf_evsel *pos; + struct perf_evlist *evlist = rec->evlist; + + evlist__for_each(evlist, pos) { + if (!pos->tailsize) + continue; + if (!pos->overwrite) + continue; + if (stop) + perf_evsel__disable(pos); + else + perf_evsel__enable(pos); + } + + rec->tailsize_evt_stopped = stop; +} + +static void record__finish_output(struct record *rec) { struct perf_data_file *file = &rec->file; @@ -925,6 +945,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) for (;;) { unsigned long long hits = rec->samples; + if (switch_output_started || done) + record__toggle_tailsize_evsels(rec, true); + if (record__mmap_read_all(rec) < 0) { auxtrace_snapshot_disable(); err = -1; @@ -943,7 +966,20 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) } if (switch_output_started) { + /* + * SIGUSR2 raise after or during record__mmap_read_all(). + * continue to read again. + */ + if (!rec->tailsize_evt_stopped) + continue; + switch_output_started = 0; + /* + * Reenable events in tailsize ring buffer after + * record__mmap_read_all(): we have collected + * data from it. + */ + record__toggle_tailsize_evsels(rec, false); if (!quiet) fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", -- 1.8.3.4