Ben Gainey 80c281fca2 tools/perf: Correctly calculate sample period for inherited SAMPLE_READ values ...

Sample period calculation in deliver_sample_value is updated to
calculate the per-thread period delta for events that are inherit +
PERF_SAMPLE_READ. When the sampling event has this configuration, the
read_format.id is used with the tid from the sample to lookup the
storage of the previously accumulated counter total before calculating
the delta. All existing valid configurations where read_format.value
represents some global value continue to use just the read_format.id to
locate the storage of the previously accumulated total.

perf_sample_id is modified to support tracking per-thread
values, along with the existing global per-id values. In the
per-thread case, values are stored in a hash by tid within the
perf_sample_id, and are dynamically allocated as the number is not known
ahead of time.

Signed-off-by: Ben Gainey <ben.gainey@arm.com>
Cc: james.clark@arm.com
Link: https://lore.kernel.org/r/20241001121505.1009685-2-ben.gainey@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

2024-10-02 14:58:03 -07:00

..

internal

tools/perf: Correctly calculate sample period for inherited SAMPLE_READ values

2024-10-02 14:58:03 -07:00

perf

perf record: Ensure space for lost samples

2024-06-13 20:45:31 -07:00