Re: [PATCH 4/5] kmemtrace: SLUB hooks.

[Mathieu Desnoyers]

* Eduard - Gabriel Munteanu (eduard.munteanu@xxxxxxxxxxx) wrote:
> On Mon, Aug 11, 2008 at 05:22:37PM +0300, Pekka Enberg wrote:
> > On Mon, 2008-08-11 at 09:21 -0500, Christoph Lameter wrote:
> > > Pekka Enberg wrote:
> > > 
> > > > The function call is supposed to go away when we convert kmemtrace to
> > > > use Mathieu's markers but I suppose even then we have a problem with
> > > > inlining?
> > > 
> > > The function calls are overwritten with NOPs? Or how does that work?
> > 
> > I have no idea. Mathieu, Eduard?
> 
> Yes, the code is patched at runtime. But AFAIK markers already provide
> this stuff (called "immediate values"). Mathieu's tracepoints also do
> it. But it's not available on all arches. x86 and x86-64 work as far as
> I remember.
> 

The markers present in mainline kernel does not use immediate values.
However, immediate values in tip does implement a load
immediate/test/branch for x86, x86_64 and powerpc. I also have support
for sparc64 in my lttng tree.

Mathieu


-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
--
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/