From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58200) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YyLzG-0002Bv-Vm for qemu-devel@nongnu.org; Fri, 29 May 2015 11:14:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YyLzC-0007PC-D2 for qemu-devel@nongnu.org; Fri, 29 May 2015 11:14:18 -0400 Received: from zimbra3.corp.accelance.fr ([2001:4080:204::2:8]:53883) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YyLzC-0007Oz-6t for qemu-devel@nongnu.org; Fri, 29 May 2015 11:14:14 -0400 From: Victor CLEMENT Date: Fri, 29 May 2015 17:14:03 +0200 Message-Id: <1432912446-9811-1-git-send-email-victor.clement@openwide.fr> Subject: [Qemu-devel] [PATCH v2 0/3] implement a new icount sleep=no mode List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: francois.guerret@hotmail.fr, pbonzini@redhat.com, Victor CLEMENT , julien.viarddegalbert@openwide.fr This patch adds a new icount_sleep mode set by the new 'sleep' parameter of the icount option. When using sleep=no mode, the QEMU_VIRTUAL_CLOCK will be running at the maximal possible speed by warping the CPU sleep times to the soonest virtual clock deadline. The goal is to get deterministic execution times by preventing potential latencies from qemu execution on the host machine. The virtual cpus sleep time will be calculated but not spent, hence the virtual time will not be realistic when looking from the host point of view (ex. a 'sleep 10' on the guest will return almost instantly while the guest clock wil act like 10s have really passed) This new mode will be used for testing real-time applications inside qemu. It makes the virtual clock "purely" virtual by removing any reference to host clocks in the calculation of QEMU_VIRTUAL_CLOCK value. To test real-time software using this mode, one need to write some scenario which will simulate inputs on an emulated device then record traces from this inputs and the associated outputs from the tested software. Victor CLEMENT (3): icount: implement a new icount_sleep mode toggleing real-time cpu sleep icount: add sleep parameter to the icount option to set icount_sleep mode icount: print a warning if there is no more deadline in sleep=no mode cpus.c | 85 +++++++++++++++++++++++++++++++++++++++------------------ qemu-options.hx | 12 ++++++-- vl.c | 3 ++ 3 files changed, 72 insertions(+), 28 deletions(-) -- 2.4.2