MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6686
# Merge Request Required Information
JIRA: https://issues.redhat.com/browse/RHEL-77358
JIRA: https://issues.redhat.com/browse/RHEL-86051
## Summary of Changes
Two upstream patchsets are contained in this merge request:
* Collect timerlat samples using a BPF program instead of pulling them through a tracefs pipe. This helps with both performance and CPU usage, and fixes an issue where on systems with \>100 CPUs, rtla cannot keep up with timerlat samples and drops most of them, making it useless.
* Always set default values of all tracer options (osnoise or timerlat) if not specified otherwise, as they might be set to unexpected values either by another user of the tracers or by a previous abnormally exited run of rtla.
Those are combined into a single MR, because the latter depends on a refactoring done in the former. A dependency (rtla test suite) is also pulled.
## Approved Development Ticket(s)
All submissions to CentOS Stream must reference a ticket in [Red Hat Jira](https://issues.redhat.com/).
<details><summary>Click for formatting instructions</summary>
Please follow the CentOS Stream [contribution documentation](https://docs.centos.org/en-US/stream-contrib/quickstart/) for how to file this ticket and have it approved.
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
List tickets each on their own line of this description using the format "Resolves: RHEL-76229", "Related: RHEL-76229" or "Reverts: RHEL-76229", as appropriate.
</details>
Approved-by: Wander Lairson Costa <wander@redhat.com>
Approved-by: John Kacur <jkacur@redhat.com>
Approved-by: Gabriele Monaco <gmonaco@redhat.com>
Approved-by: Derek Barbosa <debarbos@redhat.com>
Approved-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>
Merged-by: Augusto Caringi <acaringi@redhat.com>
b65573c720