[PATCH 2/4] NUMA: add Linux libnuma detection

[Andre Przywara <andre.przywara@amd.com>]

Add detection of libnuma (mostly contained in the numactl package)
to the configure script. Currently this is Linux only, but can be
extended later should the need for other interfaces come up.
Can be enabled or disabled on the command line, default is use if
available.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
---
 configure |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index af50607..91d5e48 100755
--- a/configure
+++ b/configure
@@ -282,6 +282,7 @@ xen=""
 linux_aio=""
 attr=""
 vhost_net=""
+numa="yes"
 
 gprof="no"
 debug_tcg="no"
@@ -722,6 +723,10 @@ for opt do
   ;;
   --enable-vhost-net) vhost_net="yes"
   ;;
+  --disable-numa) numa="no"
+  ;;
+  --enable-numa) numa="yes"
+  ;;
   --*dir)
   ;;
   *) echo "ERROR: unknown option $opt"; show_help="yes"
@@ -909,6 +914,8 @@ echo "  --enable-docs            enable documentation build"
 echo "  --disable-docs           disable documentation build"
 echo "  --disable-vhost-net      disable vhost-net acceleration support"
 echo "  --enable-vhost-net       enable vhost-net acceleration support"
+echo "  --disable-numa           disable host Linux NUMA support"
+echo "  --enable-numa            enable host Linux NUMA support"
 echo ""
 echo "NOTE: The object files are built at the place where configure is launched"
 exit 1
@@ -1987,6 +1994,28 @@ if compile_prog "" "" ; then
   signalfd=yes
 fi
 
+##########################################
+# libnuma probe
+
+if test "$numa" = "yes" ; then
+  numa=no
+  cat > $TMPC << EOF
+#include <numa.h>
+int main(void) { return numa_available(); }
+EOF
+
+  if compile_prog "" "-lnuma" ; then
+    numa=yes
+    libs_softmmu="-lnuma $libs_softmmu"
+  else
+    if test "$numa" = "yes" ; then
+      feature_not_found "linux NUMA (install numactl?)"
+    fi
+    numa=no
+  fi
+fi
+
+
 # check if eventfd is supported
 eventfd=no
 cat > $TMPC << EOF
@@ -2256,6 +2285,7 @@ echo "preadv support    $preadv"
 echo "fdatasync         $fdatasync"
 echo "uuid support      $uuid"
 echo "vhost-net support $vhost_net"
+echo "NUMA host support $numa"
 
 if test $sdl_too_old = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -2487,6 +2517,9 @@ if test $cpu_emulation = "yes"; then
 else
   echo "CONFIG_NO_CPU_EMULATION=y" >> $config_host_mak
 fi
+if test "$numa" = "yes"; then
+  echo "CONFIG_NUMA=y" >> $config_host_mak
+fi
 
 # XXX: suppress that
 if [ "$bsd" = "yes" ] ; then
-- 
1.6.4