tracing/probes: Add $current variable support

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Since we can use the BTF to cast value to a structure pointer type,
it is useful to introduce "$current" special variable support to
fetcharg.

User can define a fetcharg to access current task_struct properties
using BTF info. e.g.

  $current->cpus_ptr

Link: https://lore.kernel.org/all/178271366709.1176915.15320906169981578568.stgit@devnote2/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

...

This commit is contained in:

Masami Hiramatsu (Google) 2026-07-02 21:12:41 +09:00

parent f218345240

commit 738b78ee4b

6 changed files with 44 additions and 3 deletions

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1

Documentation/trace/fprobetrace.rst

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1

Documentation/trace/kprobetrace.rst

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4

kernel/trace/trace.c

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37

kernel/trace/trace_probe.c

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1

kernel/trace/trace_probe.h

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3

kernel/trace/trace_probe_tmpl.h

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