*: Allow disabling of `getrusage` calls

getrusage, in a heavily stressed system, can account for
signficant running time due to process switching to the kernel.
Allow the end-operator to specify `--disable-cpu-time` to
avoid this call.  Additionally we cause `show thread cpu` to
not show up if this is selected.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 730e2ae6f..6147ebf0d 100755
--- a/configure.ac
+++ b/configure.ac
@@ -536,6 +536,8 @@ AC_ARG_ENABLE([backtrace],
   AS_HELP_STRING([--disable-backtrace,], [disable crash backtraces (default autodetect)]))
 AC_ARG_ENABLE([time-check],
   AS_HELP_STRING([--disable-time-check], [disable slow thread warning messages]))
+AC_ARG_ENABLE([cpu-time],
+  AS_HELP_STRING([--disable-cpu-time], [disable cpu usage data gathering]))
 AC_ARG_ENABLE([pcreposix],
   AS_HELP_STRING([--enable-pcreposix], [enable using PCRE Posix libs for regex functions]))
 AC_ARG_ENABLE([fpm],
@@ -614,6 +616,14 @@ if test x"${enable_time_check}" != x"no" ; then
   fi
 fi
 
+case "${enable_cpu_time}" in
+  "no")
+  AC_DEFINE([EXCLUDE_CPU_TIME], [1], [Exclude getrusage data gathering])
+  ;;
+  "*")
+  ;;
+esac
+
 case "${enable_systemd}" in
   "no") ;;
   "yes")