From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56719) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eRhyi-0004zy-OH for qemu-devel@nongnu.org; Wed, 20 Dec 2017 12:16:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eRhyf-0007OT-Hq for qemu-devel@nongnu.org; Wed, 20 Dec 2017 12:16:24 -0500 Received: from mail-wr0-x229.google.com ([2a00:1450:400c:c0c::229]:37040) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eRhyf-0007O3-8j for qemu-devel@nongnu.org; Wed, 20 Dec 2017 12:16:21 -0500 Received: by mail-wr0-x229.google.com with SMTP id f8so12143066wre.4 for ; Wed, 20 Dec 2017 09:16:21 -0800 (PST) Sender: Paolo Bonzini From: Paolo Bonzini Date: Wed, 20 Dec 2017 18:14:53 +0100 Message-Id: <1513790098-9815-42-git-send-email-pbonzini@redhat.com> In-Reply-To: <1513790098-9815-1-git-send-email-pbonzini@redhat.com> References: <1513790098-9815-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PULL 41/46] rcu: reduce more than 7MB heap memory by malloc_trim() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Yang Zhong From: Yang Zhong Since there are some issues in memory alloc/free machenism in glibc for little chunk memory, if Qemu frequently alloc/free little chunk memory, the glibc doesn't alloc little chunk memory from free list of glibc and still allocate from OS, which make the heap size bigger and bigger. This patch introduce malloc_trim(), which will free heap memory when there is no rcu call during rcu thread loop. malloc_trim() can be enabled/disabled by --enable-malloc-trim/ --disable-malloc-trim in the Qemu configure command. The default malloc_trim() is enabled for libc. Below are test results from smaps file. (1)without patch 55f0783e1000-55f07992a000 rw-p 00000000 00:00 0 [heap] Size: 21796 kB Rss: 14260 kB Pss: 14260 kB (2)with patch 55cc5fadf000-55cc61008000 rw-p 00000000 00:00 0 [heap] Size: 21668 kB Rss: 6940 kB Pss: 6940 kB Signed-off-by: Yang Zhong Message-Id: <1513775806-19779-1-git-send-email-yang.zhong@intel.com> Signed-off-by: Paolo Bonzini --- configure | 35 +++++++++++++++++++++++++++++++++++ util/rcu.c | 6 ++++++ 2 files changed, 41 insertions(+) diff --git a/configure b/configure index 99ccc17..100309c 100755 --- a/configure +++ b/configure @@ -426,6 +426,7 @@ vxhs="" supported_cpu="no" supported_os="no" bogus_os="no" +malloc_trim="" # parse CC options first for opt do @@ -1047,6 +1048,10 @@ for opt do ;; --enable-tcg) tcg="yes" ;; + --disable-malloc-trim) malloc_trim="no" + ;; + --enable-malloc-trim) malloc_trim="yes" + ;; --disable-spice) spice="no" ;; --enable-spice) spice="yes" @@ -1466,6 +1471,7 @@ Advanced options (experts only): Default:trace- --disable-slirp disable SLIRP userspace network connectivity --enable-tcg-interpreter enable TCG with bytecode interpreter (TCI) + --enable-malloc-trim enable libc malloc_trim() for memory optimization --oss-lib path to OSS library --cpu=CPU Build for host CPU [$cpu] --with-coroutine=BACKEND coroutine backend. Supported options: @@ -3860,6 +3866,30 @@ if test "$tcmalloc" = "yes" && test "$jemalloc" = "yes" ; then exit 1 fi +# Even if malloc_trim() is available, these non-libc memory allocators +# do not support it. +if test "$tcmalloc" = "yes" || test "$jemalloc" = "yes" ; then + if test "$malloc_trim" = "yes" ; then + echo "Disabling malloc_trim with non-libc memory allocator" + fi + malloc_trim="no" +fi + +####################################### +# malloc_trim + +if test "$malloc_trim" != "no" ; then + cat > $TMPC << EOF +#include +int main(void) { malloc_trim(0); return 0; } +EOF + if compile_prog "" "" ; then + malloc_trim="yes" + else + malloc_trim="no" + fi +fi + ########################################## # tcmalloc probe @@ -5505,6 +5535,7 @@ if test "$tcg" = "yes" ; then echo "TCG debug enabled $debug_tcg" echo "TCG interpreter $tcg_interpreter" fi +echo "malloc trim support $malloc_trim" echo "RDMA support $rdma" echo "fdt support $fdt" echo "preadv support $preadv" @@ -6015,6 +6046,10 @@ if test "$opengl" = "yes" ; then fi fi +if test "$malloc_trim" = "yes" ; then + echo "CONFIG_MALLOC_TRIM=y" >> $config_host_mak +fi + if test "$avx2_opt" = "yes" ; then echo "CONFIG_AVX2_OPT=y" >> $config_host_mak fi diff --git a/util/rcu.c b/util/rcu.c index ca5a63e..f4d09c8 100644 --- a/util/rcu.c +++ b/util/rcu.c @@ -32,6 +32,9 @@ #include "qemu/atomic.h" #include "qemu/thread.h" #include "qemu/main-loop.h" +#if defined(CONFIG_MALLOC_TRIM) +#include +#endif /* * Global grace period counter. Bit 0 is always one in rcu_gp_ctr. @@ -246,6 +249,9 @@ static void *call_rcu_thread(void *opaque) qemu_event_reset(&rcu_call_ready_event); n = atomic_read(&rcu_call_count); if (n == 0) { +#if defined(CONFIG_MALLOC_TRIM) + malloc_trim(4 * 1024 * 1024); +#endif qemu_event_wait(&rcu_call_ready_event); } } -- 1.8.3.1