[0/4] tracing: Addition of tracing instances via kernel command line

Message

Steven Rostedt Jan. 11, 2023, 2:56 p.m. UTC

Instance creation can happen with the bootconfig but there's currently
no way to create and enable instances via the normal command line.

This series fixes that.

 trace_instance=foo,sched_switch,sched_waking ftrace_boot_snapshot=foo

The above creates a "foo" instance at early start up and enables
the sched_switch and sched_waking events. Then at the end of boot up
a snapshot is taken so that user space does not overwrite the boot
up data.


Steven Rostedt (Google) (4):
      tracing: Add creation of instances at boot command line
      tracing: Add enabling of events to boot instances
      tracing: Add trace_array_puts() to write into instance
      tracing: Allow boot instances to have snapshot buffers

----
 Documentation/admin-guide/kernel-parameters.txt |  29 +++++
 include/linux/trace.h                           |  13 ++
 kernel/trace/trace.c                            | 159 +++++++++++++++++++++---
 kernel/trace/trace.h                            |   2 +
 kernel/trace/trace_events.c                     |   9 +-
 5 files changed, 190 insertions(+), 22 deletions(-)