linux-kernel - [PATCH v2 0/4] tracing: Addition of tracing instances via kernel command line

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Message-ID: <20230207172849.461894073@goodmis.org>
Date:   Tue, 07 Feb 2023 12:28:49 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ross Zwisler <zwisler@...gle.com>
Subject: [PATCH v2 0/4] tracing: Addition of tracing instances via kernel command line

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.

Changes since v1: https://lore.kernel.org/linux-trace-kernel/20230111145636.450953217@goodmis.org/
 - Fixed document grammar (Randy Dunlap)
 - Removed extra workqueue.h include (Ross Zwisler)
 - Use sizeof(boot_instance_info) than using COMMAND_LINE_SIZE)
 - Remove unneeded @ip in kernel-doc (Ross Zwisler)
 - Make stub function for do_allocate_snapshot() for !CONFIG_TRACER_MAX_TRACE (kernel test robot)
 - Compare strstr() to NULL and not zero (kernel test robot)
 - Use sizeof(boot_snapshot_info) instead of COMMAND_LINE_SIZE (Ross Zwisler)

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/bootconfig.rst        |   6 +-
 Documentation/admin-guide/kernel-parameters.txt |  29 +++++
 include/linux/bootconfig.h                      |   2 +-
 include/linux/trace.h                           |  12 ++
 init/Kconfig                                    |  13 --
 init/main.c                                     |   2 +-
 kernel/trace/trace.c                            | 160 +++++++++++++++++++++---
 kernel/trace/trace.h                            |   2 +
 kernel/trace/trace_events.c                     |   9 +-
 9 files changed, 193 insertions(+), 42 deletions(-)