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

* Jason Baron <jbaron@redhat.com> 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


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