From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35171) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZG6ta-0000Kd-W7 for qemu-devel@nongnu.org; Fri, 17 Jul 2015 10:45:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZG6tU-0006zB-5Y for qemu-devel@nongnu.org; Fri, 17 Jul 2015 10:45:50 -0400 Received: from greensocs.com ([193.104.36.180]:59946) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZG6tT-0006xB-Rp for qemu-devel@nongnu.org; Fri, 17 Jul 2015 10:45:44 -0400 From: fred.konrad@greensocs.com Date: Fri, 17 Jul 2015 16:45:34 +0200 Message-Id: <1437144337-21442-1-git-send-email-fred.konrad@greensocs.com> Subject: [Qemu-devel] [RFC PATCH V3 0/3] Multithread TCG async_safe_work part. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, mttcg@listserver.greensocs.com Cc: mark.burton@greensocs.com, a.rigo@virtualopensystems.com, guillaume.delbergue@greensocs.com, pbonzini@redhat.com, alex.bennee@linaro.org, fred.konrad@greensocs.com From: KONRAD Frederic This is the async_safe_work introduction bit of the Multithread TCG work. Rebased on current upstream (6169b60285fe1ff730d840a49527e721bfb30899). (Currently untested as I need to rebase MTTCG first.) It can be cloned here: http://git.greensocs.com/fkonrad/mttcg.git branch async_work_v3 The first patch introduces a mutex to protect the existing queued_work_* CPUState members against multiple (concurent) access. The second patch introduces a tcg_exec_flag which will be 1 when we are inside cpu_exec(), -1 when we must not enter the cpu execution and 0 when we are allowed to do so. This is required as safe work need to be sure that's all vCPU are outside cpu_exec(). The last patch introduces async_safe_work. It allows to add some work which will be done asynchronously but only when all vCPUs are outside cpu_exec(). The tcg thread will wait that no vCPUs have any pending safe work before reentering cpu-exec(). Changes V2 -> V3: * Check atomically we are not in the executiong loop to fix the race condition which might happen. Changes V1 -> V2: * Release the lock while running the callback for both async and safe work. KONRAD Frederic (3): cpus: protect queued_work_* with work_mutex. cpus: add tcg_exec_flag. cpus: introduce async_run_safe_work_on_cpu. cpu-exec.c | 10 ++++ cpus.c | 160 ++++++++++++++++++++++++++++++++++++++++-------------- include/qom/cpu.h | 57 +++++++++++++++++++ qom/cpu.c | 20 +++++++ 4 files changed, 207 insertions(+), 40 deletions(-) -- 1.9.0