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tracing/probes: Support dumping fetcharg program for debugging dynamic events

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For debugging probe events, it is helpful to verify the compiled
fetch instructions for each probe argument. This introduces a new
kernel config CONFIG_PROBE_EVENTS_DUMP_FETCHARG to decode the
instruction sequence of each argument and display it under a
commented line starting with '#' immediately following the dynamic
event definition (such as in dynamic_events, kprobe_events,
uprobe_events, etc.).

For example:
 /sys/kernel/tracing # cat dynamic_events
 p:kprobes/p_vfs_read_0 vfs_read arg1=+0(file):ustring arg2=%ax:x16
 #  arg1: ARG(0) -> ST_USTRING(offset=0,size=4) -> END
 #  arg2: REG(80) -> ST_RAW(size=2) -> END

Link: https://lore.kernel.org/all/178271359508.1176915.11895926894608440183.stgit@devnote2/

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google) 2026-07-02 21:12:40 +09:00
commit dccddc39aa
7 changed files with 164 additions and 32 deletions
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