tcmalloc.patch: make it work without bash

[pve-qemu-kvm.git] / debian / patches / tcmalloc.patch

From patchwork Thu Mar 26 03:03:12 2015
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Subject: configure: Add support for tcmalloc
From: Fam Zheng <famz@redhat.com>
X-Patchwork-Id: 454848
Message-Id: <1427338992-27057-1-git-send-email-famz@redhat.com>
To: qemu-devel@nongnu.org
Cc: kwolf@redhat.com, Paolo Bonzini <pbonzini@redhat.com>,
 Stefan Hajnoczi <stefanha@redhat.com>,
 Peter Maydell <peter.maydell@linaro.org>
Date: Thu, 26 Mar 2015 11:03:12 +0800

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>
---
 configure | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/configure b/configure
index 589798e..03ba305 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-numa            enable tcmalloc support
 
 NOTE: The object files are built at the place where configure is launched
 EOF
@@ -3325,6 +3332,22 @@ 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
@@ -4435,6 +4458,7 @@ 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"