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Add test cases for persistent ring buffer (reserve_mem= combined
with trace_instance=) and backup instance (trace_instance=backup=boot_map).
These test cases verify:
- persistent-01-reserve-mem: Memory reservation via reserve_mem=
and trace_instance=boot_map@trace. Verifies trace data retention in
the boot_map instance across guest crash/reboot via sysrq-trigger.
- persistent-02-backup-instance: Backup instance creation via
trace_instance=backup=boot_map. Verifies that previous boot trace
log is preserved in the backup instance on the subsequent boot.
These test cases specify '# REBOOT: 1' to enable multi-boot guest
crash/reboot testing with doubled QEMU timeout.
Link: https://lore.kernel.org/all/178649544683.438282.14573895196260214231.stgit@devnote2/
Assisted-by: LLM
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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Add test cases for kernel command-line tracing options. It verifies
various parameters like trace_buf_size and trace_options by reading
the output of tracing files in sysfs.
Link: https://lore.kernel.org/all/178649543741.438282.2638887907664217934.stgit@devnote2/
Assisted-by: LLM
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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Add test cases for boot-time tracing configuration via bootconfig
(see Documentation/trace/boottime-trace.rst).
These test cases verify:
- 01-kprobe: Dynamic kprobe events via bootconfig
- 02-synth: Synthetic events via bootconfig
- 03-eprobe: Event probes (eprobes) via bootconfig
- 04-fprobe: Function probes (fprobes) via bootconfig
- 05-tprobe: Tracepoint probes via bootconfig
- 06-instance: Custom trace instances via bootconfig
Link: https://lore.kernel.org/all/178649542809.438282.16167291066989252262.stgit@devnote2/
Assisted-by: LLM
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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Add a generic test framework under tools/testing/selftests/ftrace/boottime/
to verify kernel boot tracing configurations (bootconfig, kernel
command-line tracing options, and persistent ring buffers) during early
boot.
The test runner (run_boottime_test.sh) sources ktap_helpers.sh to generate
output in TAP version 13 format. It builds a minimal initramfs with busybox,
dynamically resolves test specifications (.bconf for bootconfig, .cmdline
for kernel boot parameters, .qemuopts for QEMU options, and # REBOOT: 1
for multi-boot crash/reboot tests with doubled timeout), boots QEMU, and
runs corresponding tracefs checker scripts.
Link: https://lore.kernel.org/all/178649541846.438282.672153252242971310.stgit@devnote2/
Assisted-by: LLM
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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