From nobody Mon Feb 9 20:35:07 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1602661045; cv=none; d=zohomail.com; s=zohoarc; b=FUPoJ83/4gYPXH+WhcjhU+zHM5Q+8HAMQC8ACujR0wbJQoL9MiQ+bv3CUOk3u/QGQYdtO9yYypRAtJ75P0HSP40ug1gtpqLUwP37NcOblUvUqZOj/qFUIYnApm2/FuyIHZrlpd4C7TQZNHuonEBaJGEJfd7ZRD9aNR8jetlfhig= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1602661045; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=y6n9Bx6JtchOthF48MXL7Iwqajrg27ep7il7u6NHqI4=; b=E/C+CjVfSGESPHCVnQgnvkx9sscdW/SwcbrfbyuU6TxAMipGrQWDBzkJ4OupUtdyY2upBnKH3Vn3eXE3/iS2jU6gokWnost/7rfXZa4VFHF2fu6GRzvbIxPRZpZAkB1s2y56EN3RPa3ayul72UNdfE8et2aMWUFvT0DIxdrBlJY= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1602661045642385.3096348818683; Wed, 14 Oct 2020 00:37:25 -0700 (PDT) Received: from localhost ([::1]:45262 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kSbLg-0001SC-Eu for importer@patchew.org; Wed, 14 Oct 2020 03:37:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52252) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSbKg-00008T-52 for qemu-devel@nongnu.org; Wed, 14 Oct 2020 03:36:22 -0400 Received: from mx2.suse.de ([195.135.220.15]:50808) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSbKX-0006i0-M4 for qemu-devel@nongnu.org; Wed, 14 Oct 2020 03:36:21 -0400 Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C60FFB1F0; Wed, 14 Oct 2020 07:36:07 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de From: Claudio Fontana To: Richard Henderson , =?UTF-8?q?Alex=20Benn=C3=A9e?= Subject: [RFC v1 2/2] accel/tcg: split tcg_start_vcpu_thread Date: Wed, 14 Oct 2020 09:36:05 +0200 Message-Id: <20201014073605.6155-3-cfontana@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201014073605.6155-1-cfontana@suse.de> References: <20201014073605.6155-1-cfontana@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=195.135.220.15; envelope-from=cfontana@suse.de; helo=mx2.suse.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/12 01:21:00 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x (no timestamps) [generic] X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Claudio Fontana , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" after the initial split into 3 tcg variants, we proceed to also split tcg_start_vcpu_thread. We actually split it in 2 this time, since the icount variant just uses the round robin function. Signed-off-by: Claudio Fontana --- accel/tcg/tcg-all.c | 5 ++++ accel/tcg/tcg-cpus-icount.c | 2 +- accel/tcg/tcg-cpus-mttcg.c | 26 ++++++++++++++++- accel/tcg/tcg-cpus-rr.c | 37 +++++++++++++++++++++++- accel/tcg/tcg-cpus-rr.h | 3 ++ accel/tcg/tcg-cpus.c | 56 ------------------------------------- 6 files changed, 70 insertions(+), 59 deletions(-) diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c index e42a028043..1ac0b76515 100644 --- a/accel/tcg/tcg-all.c +++ b/accel/tcg/tcg-all.c @@ -105,6 +105,11 @@ static int tcg_init(MachineState *ms) tcg_exec_init(s->tb_size * 1024 * 1024); mttcg_enabled =3D s->mttcg_enabled; =20 + /* + * Initialize TCG regions + */ + tcg_region_init(); + if (mttcg_enabled) { cpus_register_accel(&tcg_cpus_mttcg); } else if (icount_enabled()) { diff --git a/accel/tcg/tcg-cpus-icount.c b/accel/tcg/tcg-cpus-icount.c index 43505e8f1f..8859e384d7 100644 --- a/accel/tcg/tcg-cpus-icount.c +++ b/accel/tcg/tcg-cpus-icount.c @@ -136,7 +136,7 @@ static void icount_handle_interrupt(CPUState *cpu, int = mask) } =20 const CpusAccel tcg_cpus_icount =3D { - .create_vcpu_thread =3D tcg_start_vcpu_thread, + .create_vcpu_thread =3D rr_start_vcpu_thread, .kick_vcpu_thread =3D qemu_cpu_kick_rr_cpus, =20 .handle_interrupt =3D icount_handle_interrupt, diff --git a/accel/tcg/tcg-cpus-mttcg.c b/accel/tcg/tcg-cpus-mttcg.c index 2f5317d767..1f34bbb625 100644 --- a/accel/tcg/tcg-cpus-mttcg.c +++ b/accel/tcg/tcg-cpus-mttcg.c @@ -110,8 +110,32 @@ static void mttcg_kick_vcpu_thread(CPUState *cpu) cpu_exit(cpu); } =20 +static void mttcg_start_vcpu_thread(CPUState *cpu) +{ + char thread_name[VCPU_THREAD_NAME_SIZE]; + + g_assert(tcg_enabled()); + + parallel_cpus =3D (current_machine->smp.max_cpus > 1); + + cpu->thread =3D g_malloc0(sizeof(QemuThread)); + cpu->halt_cond =3D g_malloc0(sizeof(QemuCond)); + qemu_cond_init(cpu->halt_cond); + + /* create a thread per vCPU with TCG (MTTCG) */ + snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG", + cpu->cpu_index); + + qemu_thread_create(cpu->thread, thread_name, tcg_cpu_thread_fn, + cpu, QEMU_THREAD_JOINABLE); + +#ifdef _WIN32 + cpu->hThread =3D qemu_thread_get_handle(cpu->thread); +#endif +} + const CpusAccel tcg_cpus_mttcg =3D { - .create_vcpu_thread =3D tcg_start_vcpu_thread, + .create_vcpu_thread =3D mttcg_start_vcpu_thread, .kick_vcpu_thread =3D mttcg_kick_vcpu_thread, =20 .handle_interrupt =3D tcg_handle_interrupt, diff --git a/accel/tcg/tcg-cpus-rr.c b/accel/tcg/tcg-cpus-rr.c index b8fd33d9d3..d3a1d8d626 100644 --- a/accel/tcg/tcg-cpus-rr.c +++ b/accel/tcg/tcg-cpus-rr.c @@ -262,8 +262,43 @@ void *tcg_rr_cpu_thread_fn(void *arg) return NULL; } =20 +void rr_start_vcpu_thread(CPUState *cpu) +{ + char thread_name[VCPU_THREAD_NAME_SIZE]; + static QemuCond *single_tcg_halt_cond; + static QemuThread *single_tcg_cpu_thread; + + g_assert(tcg_enabled()); + parallel_cpus =3D false; + + if (!single_tcg_cpu_thread) { + cpu->thread =3D g_malloc0(sizeof(QemuThread)); + cpu->halt_cond =3D g_malloc0(sizeof(QemuCond)); + qemu_cond_init(cpu->halt_cond); + + /* share a single thread for all cpus with TCG */ + snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG"); + qemu_thread_create(cpu->thread, thread_name, + tcg_rr_cpu_thread_fn, + cpu, QEMU_THREAD_JOINABLE); + + single_tcg_halt_cond =3D cpu->halt_cond; + single_tcg_cpu_thread =3D cpu->thread; +#ifdef _WIN32 + cpu->hThread =3D qemu_thread_get_handle(cpu->thread); +#endif + } else { + /* we share the thread */ + cpu->thread =3D single_tcg_cpu_thread; + cpu->halt_cond =3D single_tcg_halt_cond; + cpu->thread_id =3D first_cpu->thread_id; + cpu->can_do_io =3D 1; + cpu->created =3D true; + } +} + const CpusAccel tcg_cpus_rr =3D { - .create_vcpu_thread =3D tcg_start_vcpu_thread, + .create_vcpu_thread =3D rr_start_vcpu_thread, .kick_vcpu_thread =3D qemu_cpu_kick_rr_cpus, =20 .handle_interrupt =3D tcg_handle_interrupt, diff --git a/accel/tcg/tcg-cpus-rr.h b/accel/tcg/tcg-cpus-rr.h index 155510cfd4..94dc85c1c5 100644 --- a/accel/tcg/tcg-cpus-rr.h +++ b/accel/tcg/tcg-cpus-rr.h @@ -17,6 +17,9 @@ extern const CpusAccel tcg_cpus_rr; /* Kick all RR vCPUs. */ void qemu_cpu_kick_rr_cpus(CPUState *unused); =20 +/* start the round robin vcpu thread */ +void rr_start_vcpu_thread(CPUState *cpu); + /* Single-threaded TCG */ void *tcg_rr_cpu_thread_fn(void *arg); =20 diff --git a/accel/tcg/tcg-cpus.c b/accel/tcg/tcg-cpus.c index e518cc7ed4..3d2bb7a76a 100644 --- a/accel/tcg/tcg-cpus.c +++ b/accel/tcg/tcg-cpus.c @@ -36,62 +36,6 @@ =20 /* common functionality among all TCG variants */ =20 -void tcg_start_vcpu_thread(CPUState *cpu) -{ - char thread_name[VCPU_THREAD_NAME_SIZE]; - static QemuCond *single_tcg_halt_cond; - static QemuThread *single_tcg_cpu_thread; - static int tcg_region_inited; - - assert(tcg_enabled()); - /* - * Initialize TCG regions--once. Now is a good time, because: - * (1) TCG's init context, prologue and target globals have been set u= p. - * (2) qemu_tcg_mttcg_enabled() works now (TCG init code runs before t= he - * -accel flag is processed, so the check doesn't work then). - */ - if (!tcg_region_inited) { - tcg_region_inited =3D 1; - tcg_region_init(); - parallel_cpus =3D qemu_tcg_mttcg_enabled() && current_machine->smp= .max_cpus > 1; - } - - if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) { - cpu->thread =3D g_malloc0(sizeof(QemuThread)); - cpu->halt_cond =3D g_malloc0(sizeof(QemuCond)); - qemu_cond_init(cpu->halt_cond); - - if (qemu_tcg_mttcg_enabled()) { - /* create a thread per vCPU with TCG (MTTCG) */ - snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG", - cpu->cpu_index); - - qemu_thread_create(cpu->thread, thread_name, tcg_cpu_thread_fn, - cpu, QEMU_THREAD_JOINABLE); - - } else { - /* share a single thread for all cpus with TCG */ - snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG"); - qemu_thread_create(cpu->thread, thread_name, - tcg_rr_cpu_thread_fn, - cpu, QEMU_THREAD_JOINABLE); - - single_tcg_halt_cond =3D cpu->halt_cond; - single_tcg_cpu_thread =3D cpu->thread; - } -#ifdef _WIN32 - cpu->hThread =3D qemu_thread_get_handle(cpu->thread); -#endif - } else { - /* For non-MTTCG cases we share the thread */ - cpu->thread =3D single_tcg_cpu_thread; - cpu->halt_cond =3D single_tcg_halt_cond; - cpu->thread_id =3D first_cpu->thread_id; - cpu->can_do_io =3D 1; - cpu->created =3D true; - } -} - void qemu_tcg_destroy_vcpu(CPUState *cpu) { cpu_thread_signal_destroyed(cpu); --=20 2.26.2