debug: update gprof user guide
Document usage of config option "CFG_TA_MCOUNT=y" to instrument user TAs
instead of using "CFLAGS_ta_arm{64/32}=-pg" flag.
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
diff --git a/debug/gprof.rst b/debug/gprof.rst
index 63d5c0c..d76cf7a 100644
--- a/debug/gprof.rst
+++ b/debug/gprof.rst
@@ -17,8 +17,8 @@
``CFG_ULIBS_MCOUNT=y`` to instrument the user TA libraries (libutee,
libutils, libmpa).
- - Build user TAs with ``-pg``, for instance using: ``CFLAGS_ta_arm32=-pg``
- or ``CFLAGS_ta_arm64=-pg``. Note that instrumented TAs have a larger
+ - Build user TAs with ``-pg``, for instance enable: ``CFG_TA_MCOUNT=y`` to
+ instrument whole user TA. Note that instrumented TAs have a larger
``.bss`` section. The memory overhead is 1.36 times the ``.text`` size for
32-bit TAs, and 1.77 times for 64-bit ones (refer to the TA linker script
for details: ``ta/arch/arm/ta.ld.S``).