Messages in this thread | | | Date | Tue, 19 Mar 2013 14:27:38 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 2/2] tracing: syscall_regfunc() should not skip kernel threads |
| |
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@goodmis.org> 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.
-hpa
| |