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| 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 /kernel/trace/trace.c | |
| parent | f2183452402508ad68ea01eed18ae8eecfcd8f0a (diff) | |
| download | linux-next-738b78ee4bfa5e290f155be1e946bc2ae5660dfd.tar.gz linux-next-738b78ee4bfa5e290f155be1e946bc2ae5660dfd.zip | |
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.
$current->cpus_ptr
Link: https://lore.kernel.org/all/178271366709.1176915.15320906169981578568.stgit@devnote2/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 5670c4b91dc0..2b0b4f9acb2e 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4320,13 +4320,13 @@ static const char readme_msg[] = "\t args: <name>=fetcharg[:type]\n" "\t fetcharg: (%<register>|$<efield>), @<address>, @<symbol>[+|-<offset>],\n" #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API - "\t $stack<index>, $stack, $retval, $comm, $arg<N>,\n" + "\t $stack<index>, $stack, $retval, $comm, $arg<N>, $current\n" #ifdef CONFIG_PROBE_EVENTS_BTF_ARGS "\t [(structname[,field])]<argname>[->field[->field|.field...]],\n" "\t [(structname[,field])](fetcharg)->field[->field|.field...],\n" #endif #else - "\t $stack<index>, $stack, $retval, $comm,\n" + "\t $stack<index>, $stack, $retval, $comm, $current\n" #endif "\t +|-[u]<offset>(<fetcharg>), \\imm-value, \\\"imm-string\"\n" "\t kernel return probes support: $retval, $arg<N>, $comm\n" |