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| author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-02-07 20:28:53 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-02-07 20:49:56 +0300 |
| commit | 9c1c251d670bc107b9ce600a2c20adb08b4849e9 (patch) | |
| tree | cbb72fefb66e2fa9beac6e392afb5c82a704fd3f /Documentation/admin-guide | |
| parent | d503b8f7474fe7ac616518f7fc49773cbab49f36 (diff) | |
| download | linux-9c1c251d670bc107b9ce600a2c20adb08b4849e9.tar.xz | |
tracing: Allow boot instances to have snapshot buffers
Add to ftrace_boot_snapshot, "=<instance>" name, where the instance will
get a snapshot buffer, and will take a snapshot at the end of boot (which
will save the boot traces).
Link: https://lkml.kernel.org/r/20230207173026.792774721@goodmis.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Ross Zwisler <zwisler@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 40304dc3d319..7fa1ee4ba910 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1532,6 +1532,15 @@ boot up that is likely to be overridden by user space start up functionality. + Optionally, the snapshot can also be defined for a tracing + instance that was created by the trace_instance= command + line parameter. + + trace_instance=foo,sched_switch ftrace_boot_snapshot=foo + + The above will cause the "foo" tracing instance to trigger + a snapshot at the end of boot up. + ftrace_dump_on_oops[=orig_cpu] [FTRACE] will dump the trace buffers on oops. If no parameter is passed, ftrace will dump |