From: Fam Zheng <famz@redhat.com>

Date: Thu, 26 Mar 2015 11:03:12 +0800

Subject: [PATCH] configure: Add support for tcmalloc

This adds "--enable-tcmalloc" and "--disable-tcmalloc" to allow linking

to libtcmalloc from gperftools.

tcmalloc is a malloc implementation that works well with threads and is

fast, so it is good for performance.

It is disabled by default, because the MALLOC_PERTURB_ flag we use in

tests doesn't work with tcmalloc. However we can enable tcmalloc

specific heap checker and profilers later.

An IOPS gain can be observed with virtio-blk-dataplane, other parts of

QEMU will directly benefit from it as well:

==========================================================

                       glibc malloc

----------------------------------------------------------

rw         bs         iodepth    bw     iops       latency

read       4k         1          150    38511      24

----------------------------------------------------------

==========================================================

                         tcmalloc

----------------------------------------------------------

rw         bs         iodepth    bw     iops       latency

read       4k         1          156    39969      23

----------------------------------------------------------

Signed-off-by: Fam Zheng <famz@redhat.com>

Message-Id: <1427338992-27057-1-git-send-email-famz@redhat.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

(cherry picked from commit 2847b46958ab0bd604e1b3fcafba0f5ba4375833)

---

 configure | 24 ++++++++++++++++++++++++

 1 file changed, 24 insertions(+)

diff --git a/configure b/configure

index 6969f6f..75a4def 100755

--- a/configure

+++ b/configure

@@ -336,6 +336,7 @@ libssh2=""

 vhdx=""

 quorum=""

 numa=""

+tcmalloc="no"

 # parse CC options first

 for opt do

@@ -1134,6 +1135,10 @@ for opt do

   ;;

   --enable-numa) numa="yes"

   ;;

+  --disable-tcmalloc) tcmalloc="no"

+  ;;

+  --enable-tcmalloc) tcmalloc="yes"

+  ;;

   *)

       echo "ERROR: unknown option $opt"

       echo "Try '$0 --help' for more information"

@@ -1407,6 +1412,8 @@ Advanced options (experts only):

   --enable-quorum          enable quorum block filter support

   --disable-numa           disable libnuma support

   --enable-numa            enable libnuma support

+  --disable-tcmalloc       disable tcmalloc support

+  --enable-tcmalloc        enable tcmalloc support

 NOTE: The object files are built at the place where configure is launched

 EOF

@@ -3331,6 +3338,22 @@ EOF

 fi

 ##########################################

+# tcmalloc probe

+

+if test "$tcmalloc" = "yes" ; then

+  cat > $TMPC << EOF

+#include <stdlib.h>

+int main(void) { malloc(1); return 0; }

+EOF

+

+  if compile_prog "" "-ltcmalloc" ; then

+    LIBS="-ltcmalloc $LIBS"

+  else

+    feature_not_found "tcmalloc" "install gperftools devel"

+  fi

+fi

+

+##########################################

 # signalfd probe

 signalfd="no"

 cat > $TMPC << EOF

@@ -4441,6 +4464,7 @@ echo "lzo support       $lzo"

 echo "snappy support    $snappy"

 echo "bzip2 support     $bzip2"

 echo "NUMA host support $numa"

+echo "tcmalloc support  $tcmalloc"

 if test "$sdl_too_old" = "yes"; then

 echo "-> Your SDL version is too old - please upgrade to have SDL support"