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Message-ID: <CAJ9a7VgFL24gWGGJ-Wn2YycsW1DzKgu29_HaHtE=OJ0Fz3oNcA@mail.gmail.com>
Date: Wed, 5 Feb 2020 15:59:40 +0000
From: Mike Leach <mike.leach@...aro.org>
To: Leo Yan <leo.yan@...aro.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-kernel@...r.kernel.org,
Robert Walker <robert.walker@....com>,
Coresight ML <coresight@...ts.linaro.org>
Subject: Re: [PATCH v3 1/5] perf cs-etm: Swap packets for instruction samples
Hi Leo
On Mon, 3 Feb 2020 at 01:52, Leo Yan <leo.yan@...aro.org> wrote:
>
> If use option '--itrace=iNNN' with Arm CoreSight trace data, perf tool
> fails inject instruction samples; the root cause is the packets are
> only switched for branch samples and last branches but not for
> instruction samples, so the new coming packets cannot be properly
> handled for only synthesizing instruction samples.
>
> To fix this issue, this patch switches packets for instruction samples.
>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
> tools/perf/util/cs-etm.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
> index 5471045ebf5c..3dd5ba34a2c2 100644
> --- a/tools/perf/util/cs-etm.c
> +++ b/tools/perf/util/cs-etm.c
> @@ -1404,7 +1404,8 @@ static int cs_etm__sample(struct cs_etm_queue *etmq,
> }
> }
>
> - if (etm->sample_branches || etm->synth_opts.last_branch) {
> + if (etm->sample_branches || etm->synth_opts.last_branch ||
> + etm->sample_instructions) {
> /*
> * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for
> * the next incoming packet.
> @@ -1476,7 +1477,8 @@ static int cs_etm__flush(struct cs_etm_queue *etmq,
> }
>
> swap_packet:
> - if (etm->sample_branches || etm->synth_opts.last_branch) {
> + if (etm->sample_branches || etm->synth_opts.last_branch ||
> + etm->sample_instructions) {
> /*
> * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for
> * the next incoming packet.
> --
> 2.17.1
>
if is worth putting the 'if <options> { swap packet }' into a separate
function as it appears twice in identical form? Might help if more
options for swap packet are needed later.
Either way
Reviewed by: Mike Leach <mike.leach@...aro.org>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
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