From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33628) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZNLMc-00045r-0N for qemu-devel@nongnu.org; Thu, 06 Aug 2015 09:37:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZNLMb-0003UQ-89 for qemu-devel@nongnu.org; Thu, 06 Aug 2015 09:37:41 -0400 From: Paolo Bonzini Date: Thu, 6 Aug 2015 15:36:09 +0200 Message-Id: <1438868176-20364-12-git-send-email-pbonzini@redhat.com> In-Reply-To: <1438868176-20364-1-git-send-email-pbonzini@redhat.com> References: <1438868176-20364-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH 11/18] qemu-timer: optimize timerlist_run_timers List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, famz@redhat.com, stefanha@redhat.com, qemu-block@nongnu.org The case of no active timers is relatively common. Check it outside the lock. Signed-off-by: Paolo Bonzini --- qemu-timer.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/qemu-timer.c b/qemu-timer.c index 2463fe6..dc11ab9 100644 --- a/qemu-timer.c +++ b/qemu-timer.c @@ -476,6 +476,10 @@ bool timerlist_run_timers(QEMUTimerList *timer_list) QEMUTimerCB *cb; void *opaque; + if (!atomic_read(&timer_list->active_timers)) { + return false; + } + qemu_event_reset(&timer_list->timers_done_ev); if (!timer_list->clock->enabled) { goto out; -- 2.4.3