diff options
| author | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2026-07-02 21:12:41 +0900 |
|---|---|---|
| committer | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2026-07-14 22:43:16 +0900 |
| commit | 738b78ee4bfa5e290f155be1e946bc2ae5660dfd (patch) | |
| tree | 733aa8a8fbaa4ab8637c9a5b70886c95f2fc3559 /Documentation | |
| parent | f2183452402508ad68ea01eed18ae8eecfcd8f0a (diff) | |
tracing/probes: Add $current variable support
Since we can use the BTF to cast value to a structure pointer type,
it is useful to introduce "$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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/trace/fprobetrace.rst | 1 | ||||
| -rw-r--r-- | Documentation/trace/kprobetrace.rst | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/trace/fprobetrace.rst b/Documentation/trace/fprobetrace.rst index 290a9e6f7491..3392cab016b3 100644 --- a/Documentation/trace/fprobetrace.rst +++ b/Documentation/trace/fprobetrace.rst @@ -50,6 +50,7 @@ Synopsis of fprobe-events $argN : Fetch the Nth function argument. (N >= 1) (\*2) $retval : Fetch return value.(\*3) $comm : Fetch current task comm. + $current : Fetch the address of the current task_struct. +|-[u]OFFS(FETCHARG) : Fetch memory at FETCHARG +|- OFFS address.(\*4)(\*5) \IMM : Store an immediate value to the argument. NAME=FETCHARG : Set NAME as the argument name of FETCHARG. diff --git a/Documentation/trace/kprobetrace.rst b/Documentation/trace/kprobetrace.rst index a62707e6a9f2..81e4fe38791d 100644 --- a/Documentation/trace/kprobetrace.rst +++ b/Documentation/trace/kprobetrace.rst @@ -53,6 +53,7 @@ Synopsis of kprobe_events $argN : Fetch the Nth function argument. (N >= 1) (\*1) $retval : Fetch return value.(\*2) $comm : Fetch current task comm. + $current : Fetch the address of the current task_struct. +|-[u]OFFS(FETCHARG) : Fetch memory at FETCHARG +|- OFFS address.(\*3)(\*4) \IMM : Store an immediate value to the argument. NAME=FETCHARG : Set NAME as the argument name of FETCHARG. |