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

Christoph Lameter
2008-08-11T15:48:29Z

Frank Ch. Eigler wrote:
> Christoph Lameter <cl@linux-foundation.org> writes:
>
>> [...]
>>> There should be no extra function calls when this is configured on but
>>> tracing disabled. We try very hard to keep the speed of the tracer as
>>> close to a non tracing kernel as possible when tracing is disabled.
>> Makes sense. But then we have even more code bloat because of the
>> tests that are inserted in all call sites of kmalloc.
>
> Are you talking about the tests that implement checking whether a
> marker is active or not? Those checks are already efficient, and will
> get more so with the "immediate values" optimization in or near the
> tree.

AFAICT: Each test also adds an out of line call to the tracing facility.