Re: [GIT PULL] tracing: Syscalls trace events + perf support

[Ingo Molnar]

* Jason Baron <jbaron@xxxxxxxxxx> wrote:

> On Wed, Aug 12, 2009 at 01:14:36PM +0200, Ingo Molnar wrote:

> > another thing: could we please also have a generic, highlevel 
> > tracepoint (in addition to the specific tracepoints) that 
> > enumerates the raw syscall Nr and the parameters it gets - in a 
> > single tracepoint?
> 
> The specific tracepoints, are all layered on 2 (entry, exit) 
> generic tracepoints already. So this shouldn't be too hard...The 
> parameters it gets might be tricky, since there are a variable 
> number b/w different syscalls?

We should just list all ~6 of them. It's up to the sampling entity 
to decide which ones (if any) is relevant.

At least on x86 the syscall arguments will always have a value when 
the syscall entry code is called. (they are in GP registers)

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/