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configure: Add support for tcmalloc

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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>
This commit is contained in:
Fam Zheng 2015-03-26 11:03:12 +08:00 committed by Paolo Bonzini
parent 23820dbfc7
commit 2847b46958
1 changed files with 24 additions and 0 deletions
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24
configure vendored
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@ -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 '$0 --help' for more information"
@ -1407,6 +1412,8 @@ Advanced options (experts only):
--enable-quorum enable quorum block filter support
--disable-numa disable libnuma support
--enable-numa enable libnuma support
--disable-tcmalloc disable tcmalloc support
--enable-tcmalloc enable tcmalloc support
NOTE: The object files are built at the place where configure is launched
EOF
@ -3330,6 +3337,22 @@ EOF
fi
fi
##########################################
# tcmalloc probe
if test "$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"
@ -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"