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

From: H. Peter Anvin
Date: Tue Mar 19 2013 - 17:27:50 EST

On 03/19/2013 08:36 AM, Steven Rostedt wrote:
> 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 ;-)

Yes, given that the machinery is already there we might as well use it.


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