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From 7016ef484a8150337f22f45f694c0901c5ae0a26 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 26 Jun 2015 11:23:50 +0200
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Subject: [PATCH 10/10] configure: Add support for tcmalloc
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Message-id: <1435317831-6743-1-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 66518
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O-Subject: [RHEL7.2 qemu-kvm PATCH] configure: Add support for tcmalloc
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Bugzilla: 1213881
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RH-Acked-by: Jeff Nelson <jenelson@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Fam Zheng <famz@redhat.com>
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This adds "--enable-tcmalloc" and "--disable-tcmalloc" to allow linking
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to libtcmalloc from gperftools.
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tcmalloc is a malloc implementation that works well with threads and is
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fast, so it is good for performance.
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It is disabled by default, because the MALLOC_PERTURB_ flag we use in
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tests doesn't work with tcmalloc. However we can enable tcmalloc
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specific heap checker and profilers later.
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An IOPS gain can be observed with virtio-blk-dataplane, other parts of
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QEMU will directly benefit from it as well:
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==========================================================
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glibc malloc
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----------------------------------------------------------
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rw bs iodepth bw iops latency
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read 4k 1 150 38511 24
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----------------------------------------------------------
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==========================================================
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tcmalloc
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----------------------------------------------------------
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rw bs iodepth bw iops latency
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read 4k 1 156 39969 23
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----------------------------------------------------------
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Message-Id: <1427338992-27057-1-git-send-email-famz@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 2847b46958ab0bd604e1b3fcafba0f5ba4375833)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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configure
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Note on the RHEL7 part:
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malloc(1) would fail to compile due to -D_FORTIFY_SOURCE=2 that
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configure passes in --extra-cflags. The flag enables warnings
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for unused result of malloc. However, QEMU already knows about
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-D_FORTIFY_SOURCE and enables it after configure tests are run.
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So, remove it from --extra-cflags and trust configure to do the
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right thing.
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---
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configure | 24 ++++++++++++++++++++++++
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redhat/qemu-kvm.spec.template | 10 ++++++++++
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2 files changed, 34 insertions(+)
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diff --git a/configure b/configure
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index 85dbfb0..5877e82 100755
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--- a/configure
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+++ b/configure
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@@ -250,6 +250,7 @@ libssh2=""
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live_block_ops="yes"
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live_block_migration="no"
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vhdx=""
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+tcmalloc="no"
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# parse CC options first
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for opt do
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@@ -972,6 +973,10 @@ for opt do
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;;
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--disable-vhdx) vhdx="no"
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;;
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+ --disable-tcmalloc) tcmalloc="no"
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+ ;;
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+ --enable-tcmalloc) tcmalloc="yes"
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+ ;;
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*) echo "ERROR: unknown option $opt"; show_help="yes"
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;;
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esac
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@@ -1253,6 +1258,8 @@ echo " --disable-live-block-migration disable live block migration"
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echo " --enable-live-block-migration enable live block migration"
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echo " --disable-vhdx disables support for the Microsoft VHDX image format"
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echo " --enable-vhdx enable support for the Microsoft VHDX image format"
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+echo " --disable-tcmalloc disable tcmalloc support"
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+echo " --enable-tcmalloc enable tcmalloc support"
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echo ""
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echo "NOTE: The object files are built at the place where configure is launched"
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exit 1
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@@ -2878,6 +2885,22 @@ if compile_prog "" "" ; then
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fi
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##########################################
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+# tcmalloc probe
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+
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+if test "$tcmalloc" = "yes" ; then
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+ cat > $TMPC << EOF
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+#include <stdlib.h>
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+int main(void) { malloc(1); return 0; }
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+EOF
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+
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+ if compile_prog "" "-ltcmalloc" ; then
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+ LIBS="-ltcmalloc $LIBS"
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+ else
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+ feature_not_found "tcmalloc" "install gperftools devel"
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+ fi
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+fi
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+
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+##########################################
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# signalfd probe
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signalfd="no"
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cat > $TMPC << EOF
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@@ -3744,6 +3767,7 @@ echo "Live block migration $live_block_migration"
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echo "vhdx $vhdx"
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echo "lzo support $lzo"
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echo "snappy support $snappy"
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+echo "tcmalloc support $tcmalloc"
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if test "$sdl_too_old" = "yes"; then
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echo "-> Your SDL version is too old - please upgrade to have SDL support"
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--
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1.8.3.1
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