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authorSteven Rostedt <[email protected]>2024-08-22 21:39:06 -0400
committerSteven Rostedt (Google) <[email protected]>2024-08-26 13:54:08 -0400
commitef2bd81d0c95616fab718738be48d7cc9b23e33d (patch)
tree74cb377eb07f2969c6634c08eed1c4d8f22b0c6f /scripts/bpf_doc.py
parent9b7bdf6f6ece6ea888cc7d2f02c00b403b66a119 (diff)
tracing: Add option to set an instance to be the trace_printk destination
Add a option "trace_printk_dest" that will make the tracing instance the location that trace_printk() will go to. This is useful if the trace_printk or one of the top level tracers is too noisy and there's a need to separate the two. Then an instance can be created, the trace_printk can be set to go there instead, where it will not be lost in the noise of the top level tracer. Note, only one instance can be the destination of trace_printk at a time. If an instance sets this flag, the instance that had it set will have it cleared. There is always one instance that has this set. By default, that is the top instance. This flag cannot be cleared from the top instance. Doing so will result in an -EINVAL. The only way this flag can be cleared from the top instance is by another instance setting it. Cc: Masami Hiramatsu <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Vincent Donnefort <[email protected]> Cc: Joel Fernandes <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vineeth Pillai <[email protected]> Cc: Beau Belgrave <[email protected]> Cc: Alexander Graf <[email protected]> Cc: Baoquan He <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: "Paul E. McKenney" <[email protected]> Cc: David Howells <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Tony Luck <[email protected]> Cc: Guenter Roeck <[email protected]> Cc: Ross Zwisler <[email protected]> Cc: Kees Cook <[email protected]> Cc: Alexander Aring <[email protected]> Cc: "Luis Claudio R. Goncalves" <[email protected]> Cc: Tomas Glozar <[email protected]> Cc: John Kacur <[email protected]> Cc: Clark Williams <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: "Jonathan Corbet" <[email protected]> Link: https://lore.kernel.org/[email protected] Signed-off-by: Steven Rostedt (Google) <[email protected]>
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