doc: add Arm PMU build option in profiling guide

Documented the role of RTE_ARM_EAL_RDTSC_USE_PMU to enable
PMU based rte_rdtsc().

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Acked-by: Ruifeng Wang <ruifeng.wang@arm.com>

diff --git a/doc/guides/prog_guide/profile_app.rst b/doc/guides/prog_guide/profile_app.rst
index 52f85bb..bd6700e 100644 (file)
--- a/doc/guides/prog_guide/profile_app.rst
+++ b/doc/guides/prog_guide/profile_app.rst
@@ -94,7 +94,16 @@ an ARMv8 machine.
     make
     sudo insmod pmu_el0_cycle_counter.ko
 
-Please refer to :doc:`../linux_gsg/build_dpdk` for details on compiling DPDK with meson.
+Please refer to :doc:`../linux_gsg/build_dpdk` for generic details on compiling DPDK with meson.
+
+In order to enable ``PMU`` based ``rte_rdtsc()``, user needs to configure the
+build with ``-Dc_args='-DRTE_ARM_EAL_RDTSC_USE_PMU'``.
+
+Example:
+
+.. code-block:: console
+
+   meson --cross config/arm/arm64_armv8_linux_gcc -Dc_args='-DRTE_ARM_EAL_RDTSC_USE_PMU' build
 
 .. warning::