]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
perf arm-spe: Bail out if the trace is later than perf event
authorLeo Yan <leo.yan@linaro.org>
Wed, 19 May 2021 07:19:38 +0000 (15:19 +0800)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 1 Jul 2021 19:14:36 +0000 (16:14 -0300)
commitafb5e9e47faf53e0f557e22979076dc1a94ef3d7
tree218ed45b8e79adb43e2b1ee078c57f1d6ccd42ec
parent85498f756f015e3ae89dbe0c94480ad76929752a
perf arm-spe: Bail out if the trace is later than perf event

It's possible that record in Arm SPE trace is later than perf event and
vice versa.  This asks to correlate the perf events and Arm SPE
synthesized events to be processed in the manner of correct timing.

To achieve the time ordering, this patch reverses the flow, it firstly
calls arm_spe_sample() and then calls arm_spe_decode().  By comparing
the timestamp value and detect the perf event is coming earlier than Arm
SPE trace data, it bails out from the decoding loop, the last record is
pushed into auxtrace stack and is deferred to generate sample.  To track
the timestamp, everytime it updates timestamp for the latest record.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Al Grant <Al.Grant@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20210519071939.1598923-5-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/util/arm-spe.c