Re: [PATCH 2/2] tracing: syscall_regfunc() should not skip kernelthreads

From: Steven Rostedt
Date: Tue Mar 19 2013 - 11:36:44 EST

On Tue, 2013-03-19 at 15:10 +0000, David Howells wrote:
> Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> > Why? If we remove the tracepoint from the slowpath and use a table swap,
> > then we wouldn't need to use the slowpath at all.
> How are you engineering a table swap? Do you patch the system call code to
> change the immediate address loaded or do you put in a level of indirection?

Patching the call site would probably be the easiest method.

We've gotten pretty good at doing that ;-)

-- Steve

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at