From: Wei Li liwei391@huawei.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@huawei-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@huawei-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@huawei.com Cc: Jiri Olsa jolsa@redhat.com Cc: Tan Xiaojun tanxiaojun@huawei.com Cc: stable@vger.kernel.org # 5.4+ Link: http://lore.kernel.org/lkml/20200214132654.20395-2-adrian.hunter@intel.com [ ahunter: removed redundant 'else' after 'return' ] Signed-off-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com --- 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 20df442fdf36..be07d6886256 100644 --- a/tools/perf/arch/x86/util/intel-pt.c +++ b/tools/perf/arch/x86/util/intel-pt.c @@ -1173,9 +1173,12 @@ 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; }