[PATCH v4] eal: add build-time option to omit trace

[Stephen Hemminger]

On Tue, 24 Sep 2024 13:39:57 +0000
Morten Brørup <mb at smartsharesystems.com> wrote:

> Some applications want to omit the trace feature.
> Either to reduce the memory footprint, to reduce the exposed attack
> surface, or for other reasons.
> 
> This patch adds an option in rte_config.h to include or omit trace in the
> build. Trace is included by default.
> 
> Omitting trace works by omitting all trace points.
> For API and ABI compatibility, the trace feature itself remains.
> 
> Signed-off-by: Morten Brørup <mb at smartsharesystems.com>

This is good compact solution. In future, it would be nice if DPDK could
use static keys to isolate rarely used features. But static keys require
runtime modification of instructions.

https://docs.kernel.org/6.7/staging/static-keys.html

Acked-by: Stephen Hemminger <stephen at networkplumber.org>