linux-kernel - [PATCH V2 1/5] perf tools: intel-pt: fix endless record after being terminated

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Date:   Fri, 14 Feb 2020 15:26:50 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Tan Xiaojun <tanxiaojun@...wei.com>,
        Wei Li <liwei391@...wei.com>
Subject: [PATCH V2 1/5] perf tools: intel-pt: fix endless record after being terminated

From: Wei Li <liwei391@...wei.com>

In __cmd_record(), when receiving SIGINT(ctrl + c), a done flag will
be set and the event list will be disabled by evlist__disable() once.

While in auxtrace_record.read_finish(), the related events will be
enabled again, if they are continuous, the recording seems to be endless.

If the intel_pt event is disabled, we don't enable it again here.

Before the patch:
huawei@...wei-2288H-V5:~/linux-5.5-rc4/tools/perf$ ./perf record -e \
intel_pt//u -p 46803
^C^C^C^C^C^C

After the patch:
huawei@...wei-2288H-V5:~/linux-5.5-rc4/tools/perf$ ./perf record -e \
intel_pt//u -p 48591
^C[ perf record: Woken up 0 times to write data ]
Warning:
AUX data lost 504 times out of 4816!

[ perf record: Captured and wrote 2024.405 MB perf.data ]

Signed-off-by: Wei Li <liwei391@...wei.com>
[ahunter: removed redundant 'else' after 'return']
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: stable@...r.kernel.org # 5.4+
---
 tools/perf/arch/x86/util/intel-pt.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index ec75445ef7cf..2f0a0832907f 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -1177,9 +1177,12 @@ static int intel_pt_read_finish(struct auxtrace_record *itr, int idx)
 	struct evsel *evsel;
 
 	evlist__for_each_entry(ptr->evlist, evsel) {
-		if (evsel->core.attr.type == ptr->intel_pt_pmu->type)
+		if (evsel->core.attr.type == ptr->intel_pt_pmu->type) {
+			if (evsel->disabled)
+				return 0;
 			return perf_evlist__enable_event_idx(ptr->evlist, evsel,
 							     idx);
+		}
 	}
 	return -EINVAL;
 }
-- 
2.17.1