On 12/04/2021 12:10, Leo Yan wrote:
> In current code, it assigns the arch timer counter to the synthesized
> samples Arm SPE trace, thus the samples don't contain the kernel time
> but only contain the raw counter value.
>
> To fix the issue, this patch converts the timer counter to kernel time
> and assigns it to sample timestamp.
>
> Signed-off-by: Leo Yan <leo....@linaro.org>
> ---
> tools/perf/util/arm-spe.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
> index 23714cf0380e..c13a89f06ab8 100644
> --- a/tools/perf/util/arm-spe.c
> +++ b/tools/perf/util/arm-spe.c
> @@ -234,7 +234,7 @@ static void arm_spe_prep_sample(struct arm_spe *spe,
> struct arm_spe_record *record = &speq->decoder->record;
>
> if (!spe->timeless_decoding)
> - sample->time = speq->timestamp;
> + sample->time = tsc_to_perf_time(record->timestamp, &spe->tc);
I noticed that in arm_spe_recording_options() the TIME sample bit is set
regardless of any options.
I don't know of a way to remove this, and if there isn't, does that mean that
all the code in this
file that looks at spe->timeless_decoding is untested and has never been hit?
Unless there is a way to get a perf file with only the AUXTRACE event and no
others? I think that one
might have no timestamp set. Otherwise other events will always have timestamps
so spe->timeless_decoding
is always false.
>
> sample->ip = record->from_ip;
> sample->cpumode = arm_spe_cpumode(spe, sample->ip);
>
