Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 094/168] perf cs-etm: Fix endless record after being terminated | Date | Tue, 10 Mar 2020 13:39:00 +0100 |
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From: Wei Li <liwei391@huawei.com>
commit c9f2833cb472cf9e0a49b7bcdc210a96017a7bfd upstream.
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 cs_etm event is disabled, we don't enable it again here.
Note: This patch is NOT tested since i don't have such a machine with coresight feature, but the code seems buggy same as arm-spe and intel-pt.
Tester notes:
Thanks for looping, Adrian. Applied this patch and tested with CoreSight on juno board, it works well.
Signed-off-by: Wei Li <liwei391@huawei.com> Reviewed-by: Leo Yan <leo.yan@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Tested-by: Leo Yan <leo.yan@linaro.org> 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/20200214132654.20395-4-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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- tools/perf/arch/arm/util/cs-etm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/tools/perf/arch/arm/util/cs-etm.c +++ b/tools/perf/arch/arm/util/cs-etm.c @@ -865,9 +865,12 @@ static int cs_etm_read_finish(struct aux struct evsel *evsel; evlist__for_each_entry(ptr->evlist, evsel) { - if (evsel->core.attr.type == ptr->cs_etm_pmu->type) + if (evsel->core.attr.type == ptr->cs_etm_pmu->type) { + if (evsel->disabled) + return 0; return perf_evlist__enable_event_idx(ptr->evlist, evsel, idx); + } } return -EINVAL;
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