From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752168AbcFVJJ5 (ORCPT ); Wed, 22 Jun 2016 05:09:57 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:8022 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752100AbcFVJJx (ORCPT ); Wed, 22 Jun 2016 05:09:53 -0400 From: Wang Nan To: CC: , , Wang Nan , He Kuang , "Arnaldo Carvalho de Melo" , Jiri Olsa , Masami Hiramatsu , Namhyung Kim , Zefan Li Subject: [PATCH v9 4/8] perf record: Introduce rec->overwrite_evlist for overwritable events Date: Wed, 22 Jun 2016 09:08:47 +0000 Message-ID: <1466586531-89751-5-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1466586531-89751-1-git-send-email-wangnan0@huawei.com> References: <1466586531-89751-1-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=0001.0A020203.576A55D2.014E,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 0da29c48253166a46429c3473b6bbad7 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Create an auxiliary evlist for overwritable events. Before mmap, build this evlist and set 'overwrite' and 'backward' attribute. Since perf_evlist__mmap_ex() only maps events when evsel->overwrite matches evlist's corresponding attributes, with these two evlists an event goes to either rec->evlist or rec->overwrite_evlist. Signed-off-by: Wang Nan Cc: 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 | 81 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 76 insertions(+), 5 deletions(-) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 7998ec3..4a77bf3 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -50,6 +50,7 @@ struct record { struct perf_data_file file; struct auxtrace_record *itr; struct perf_evlist *evlist; + struct perf_evlist *overwrite_evlist; struct perf_session *session; const char *progname; int realtime_prio; @@ -341,13 +342,41 @@ int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused) #endif +static int record__create_overwrite_evlist(struct record *rec) +{ + struct perf_evlist *evlist = rec->evlist; + struct perf_evsel *pos; + + evlist__for_each(evlist, pos) { + if (!pos->overwrite) + continue; + + if (!rec->overwrite_evlist) { + rec->overwrite_evlist = perf_evlist__new_aux(evlist); + if (rec->overwrite_evlist) { + rec->overwrite_evlist->backward = true; + rec->overwrite_evlist->overwrite = true; + return 0; + } else + return -ENOMEM; + } + } + return 0; +} + static int record__mmap_evlist(struct record *rec, - struct perf_evlist *evlist) + struct perf_evlist *evlist, + bool overwrite) { struct record_opts *opts = &rec->opts; char msg[512]; - if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false, + /* + * Don't use evlist->overwrite because it is logically an + * internal attribute and is set by perf_evlist__mmap_ex(). + * Avoid circular dependency. + */ + if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, overwrite, opts->auxtrace_mmap_pages, opts->auxtrace_snapshot_mode) < 0) { if (errno == EPERM) { @@ -372,7 +401,23 @@ static int record__mmap_evlist(struct record *rec, static int record__mmap(struct record *rec) { - return record__mmap_evlist(rec, rec->evlist); + int err; + + err = record__create_overwrite_evlist(rec); + if (err) + return err; + + err = record__mmap_evlist(rec, rec->evlist, false); + if (err) + return err; + + if (!rec->overwrite_evlist) + return 0; + + err = record__mmap_evlist(rec, rec->overwrite_evlist, true); + if (err) + return err; + return 0; } static int record__open(struct record *rec) @@ -387,6 +432,13 @@ static int record__open(struct record *rec) perf_evlist__config(evlist, opts, &callchain_param); evlist__for_each(evlist, pos) { + if (pos->overwrite) { + if (!pos->attr.write_backward) { + ui__warning("Unable to read from overwrite ring buffer\n\n"); + rc = -ENOSYS; + goto out; + } + } try_again: if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) { if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) { @@ -671,10 +723,26 @@ perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused return 0; } +static const struct perf_event_mmap_page * +perf_evlist__pick_pc(struct perf_evlist *evlist) +{ + if (evlist && evlist->mmap && evlist->mmap[0].base) + return evlist->mmap[0].base; + return NULL; +} + static const struct perf_event_mmap_page *record__pick_pc(struct record *rec) { - if (rec->evlist && rec->evlist->mmap && rec->evlist->mmap[0].base) - return rec->evlist->mmap[0].base; + const struct perf_event_mmap_page *pc; + + /* Change it to a loop if a new aux evlist is added */ + pc = perf_evlist__pick_pc(rec->evlist); + if (pc) + return pc; + pc = perf_evlist__pick_pc(rec->overwrite_evlist); + if (pc) + return pc; + return NULL; } @@ -1285,6 +1353,7 @@ static struct record record = { .mmap2 = perf_event__process_mmap2, .ordered_events = true, }, + .overwrite_evlist = NULL, }; const char record_callchain_help[] = CALLCHAIN_RECORD_HELP @@ -1588,6 +1657,8 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused) err = __cmd_record(&record, argc, argv); out_symbol_exit: perf_evlist__delete(rec->evlist); + if (rec->overwrite_evlist) + perf_evlist__delete(rec->overwrite_evlist); symbol__exit(); auxtrace_record__free(rec->itr); return err; -- 1.8.3.4