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tracing: expose current->comm to [ku]probe events

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ftrace is very quick to give up on saving the task command line (see
`trace_save_cmdline()`). The workaround for events which really care
about the command line is to explicitly assign it as part of the entry.
However, this doesn't work for kprobe events, as there's no
straightforward way to get access to current->comm. Add a kprobe/uprobe
event variable $comm which provides exactly that.

Link: http://lkml.kernel.org/r/f59b472033b943a370f5f48d0af37698f409108f.1465435894.git.osandov@fb.com

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Omar Sandoval
2016-06-08 18:38:02 -07:00
committed by Steven Rostedt
parent 345ddcc882
commit 35abb67de7
5 changed files with 50 additions and 0 deletions
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Documentation/trace/kprobetrace.txt
+3
View File
@@ -40,6 +40,7 @@ Synopsis of kprobe_events
$stackN : Fetch Nth entry of stack (N >= 0)
$stack : Fetch stack address.
$retval : Fetch return value.(*)
$comm : Fetch current task comm.
+|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(**)
NAME=FETCHARG : Set NAME as the argument name of FETCHARG.
FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types
@@ -62,6 +63,8 @@ offset, and container-size (usually 32). The syntax is;
b<bit-width>@<bit-offset>/<container-size>
For $comm, the default type is "string"; any other type is invalid.
Per-Probe Event Filtering
-------------------------
Documentation/trace/uprobetracer.txt
+3
View File
@@ -36,6 +36,7 @@ Synopsis of uprobe_tracer
$stackN : Fetch Nth entry of stack (N >= 0)
$stack : Fetch stack address.
$retval : Fetch return value.(*)
$comm : Fetch current task comm.
+|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(**)
NAME=FETCHARG : Set NAME as the argument name of FETCHARG.
FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types
@@ -57,6 +58,8 @@ offset, and container-size (usually 32). The syntax is;
b<bit-width>@<bit-offset>/<container-size>
For $comm, the default type is "string"; any other type is invalid.
Event Profiling
---------------