system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-11-05 18:23:50 +00:00
Code Issues Projects Releases Packages Wiki Activity

perf cs-etm: Enable itrace option 'T'

Browse source 
Prior to Armv8.4, the feature FEAT_TRF is not supported by Arm CPUs.
Consequently, the sysfs node 'ts_source' will not be set as 1 by the
CoreSight ETM driver.  On the other hand, the perf tool relies on the
'ts_source' node to determine whether the kernel timestamp is traced.
Since the 'ts_source' is not set for Arm CPUs prior to Armv8.4,
platforms in this case cannot utilize the traced timestamp as the kernel
time.

This patch enables the 'T' itrace option, which forcibly utilizes the
traced timestamp as the kernel time.  If users are aware that their
working platform's Arm CoreSight shares the same counter with the kernel
time, they can specify 'T' option to decode the traced timestamp as the
kernel time.

An usage example is:

  # perf record -e cs_etm// -- test_program
  # perf script --itrace=i10ibT
  # perf report --itrace=i10ibT

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20231014074513.1668000-3-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Leo Yan 2023-10-14 15:45:13 +08:00 committed by Arnaldo Carvalho de Melo
parent 26218331f4
commit a4271827e6
1 changed files with 18 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
tools/perf/util/cs-etm.c
View file

@ -3346,12 +3346,27 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
etm->metadata = metadata;
etm->auxtrace_type = auxtrace_info->type;
/* Use virtual timestamps if all ETMs report ts_source = 1 */
etm->has_virtual_ts = cs_etm__has_virtual_ts(metadata, num_cpu);
if (etm->synth_opts.use_timestamp)
/*
* Prior to Armv8.4, Arm CPUs don't support FEAT_TRF feature,
* therefore the decoder cannot know if the timestamp trace is
* same with the kernel time.
*
* If a user has knowledge for the working platform and can
* specify itrace option 'T' to tell decoder to forcely use the
* traced timestamp as the kernel time.
*/
etm->has_virtual_ts = true;
else
/* Use virtual timestamps if all ETMs report ts_source = 1 */
etm->has_virtual_ts = cs_etm__has_virtual_ts(metadata, num_cpu);
if (!etm->has_virtual_ts)
ui__warning("Virtual timestamps are not enabled, or not supported by the traced system.\n"
"The time field of the samples will not be set accurately.\n\n");
"The time field of the samples will not be set accurately.\n"
"For Arm CPUs prior to Armv8.4 or without support FEAT_TRF,\n"
"you can specify the itrace option 'T' for timestamp decoding\n"
"if the Coresight timestamp on the platform is same with the kernel time.\n\n");
etm->auxtrace.process_event = cs_etm__process_event;
etm->auxtrace.process_auxtrace_event = cs_etm__process_auxtrace_event;