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| author | Steven Rostedt <rostedt@goodmis.org> | 2024-08-23 03:39:04 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-08-26 19:54:08 +0200 |
| commit | ddb8ea9e5ae482c469bcfd61cc83399bef67beb8 (patch) | |
| tree | 9c091197ab91b992f6e7e8a73fb6b30986019f4a /Documentation/admin-guide/kernel-parameters.txt | |
| parent | tracing: Add "traceoff" flag to boot time tracing instances (diff) | |
| download | linux-ddb8ea9e5ae482c469bcfd61cc83399bef67beb8.tar.xz linux-ddb8ea9e5ae482c469bcfd61cc83399bef67beb8.zip | |
tracing: Allow trace_printk() to go to other instance buffers
Currently, trace_printk() just goes to the top level ring buffer. But
there may be times that it should go to one of the instances created by
the kernel command line.
Add a new trace_instance flag: traceprintk (also can use "printk" or
"trace_printk" as people tend to forget the actual flag name).
trace_instance=foo^traceprintk
Will assign the trace_printk to this buffer at boot up.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineeth Pillai <vineeth@bitbyteword.org>
Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Alexander Aring <aahringo@redhat.com>
Cc: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Jonathan Corbet" <corbet@lwn.net>
Link: https://lore.kernel.org/20240823014019.226694946@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 3803f2b7f065..a8803c0c0a89 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6744,11 +6744,17 @@ event, and all events under the "initcall" system. Flags can be added to the instance to modify its behavior when it is - created. The flags are separated by '^'. Currently there's only one flag - defined, and that's "traceoff", to have the tracing instance tracing - disabled after it is created. + created. The flags are separated by '^'. - trace_instance=foo^traceoff,sched,irq + The available flags are: + + traceoff - Have the tracing instance tracing disabled after it is created. + traceprintk - Have trace_printk() write into this trace instance + (note, "printk" and "trace_printk" can also be used) + Currently, traceprintk flag cannot be used for memory + mapped ring buffers as described below. + + trace_instance=foo^traceoff^traceprintk,sched,irq The flags must come before the defined events. |