From nobody Mon Feb 9 19:10:17 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1643033955099208.67424409046941; Mon, 24 Jan 2022 06:19:15 -0800 (PST) Received: from localhost ([::1]:41000 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nC0Bd-0002ZM-EZ for importer@patchew.org; Mon, 24 Jan 2022 09:19:13 -0500 Received: from eggs.gnu.org ([209.51.188.92]:40050) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nC046-0001XU-0j for qemu-devel@nongnu.org; Mon, 24 Jan 2022 09:11:26 -0500 Received: from prt-mail.chinatelecom.cn ([42.123.76.222]:43199 helo=chinatelecom.cn) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nC03z-0003w0-6Z for qemu-devel@nongnu.org; Mon, 24 Jan 2022 09:11:25 -0500 Received: from clientip-171.223.99.59 (unknown [172.18.0.188]) by chinatelecom.cn (HERMES) with SMTP id 9DC8F2800A8; Mon, 24 Jan 2022 22:10:50 +0800 (CST) Received: from ([172.18.0.188]) by app0023 with ESMTP id 120752eb612a4aab8455b98c6b944354 for qemu-devel@nongnu.org; Mon, 24 Jan 2022 22:10:53 CST HMM_SOURCE_IP: 172.18.0.188:38272.1433758357 HMM_ATTACHE_NUM: 0000 HMM_SOURCE_TYPE: SMTP X-189-SAVE-TO-SEND: +huangy81@chinatelecom.cn X-Transaction-ID: 120752eb612a4aab8455b98c6b944354 X-Real-From: huangy81@chinatelecom.cn X-Receive-IP: 172.18.0.188 X-MEDUSA-Status: 0 From: huangy81@chinatelecom.cn To: qemu-devel Subject: [PATCH v12 1/5] accel/kvm/kvm-all: refactor per-vcpu dirty ring reaping Date: Mon, 24 Jan 2022 22:10:36 +0800 Message-Id: X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=42.123.76.222; envelope-from=huangy81@chinatelecom.cn; helo=chinatelecom.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , David Hildenbrand , Hyman , Juan Quintela , Richard Henderson , Markus ArmBruster , Peter Xu , "Dr. David Alan Gilbert" , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1643033957762100001 From: Hyman Huang(=E9=BB=84=E5=8B=87) Add a non-required argument 'CPUState' to kvm_dirty_ring_reap so that it can cover single vcpu dirty ring reaping scenario. Only just reaping the target vcpu dirty ring instead of all when vcpu thread return to user space caused by KVM_EXIT_DIRTY_RING_FULL. Signed-off-by: Hyman Huang(=E9=BB=84=E5=8B=87) --- accel/kvm/kvm-all.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 0e66ebb..1a5f1d1 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -756,17 +756,20 @@ static uint32_t kvm_dirty_ring_reap_one(KVMState *s, = CPUState *cpu) } =20 /* Must be with slots_lock held */ -static uint64_t kvm_dirty_ring_reap_locked(KVMState *s) +static uint64_t kvm_dirty_ring_reap_locked(KVMState *s, CPUState* cpu) { int ret; - CPUState *cpu; uint64_t total =3D 0; int64_t stamp; =20 stamp =3D get_clock(); =20 - CPU_FOREACH(cpu) { - total +=3D kvm_dirty_ring_reap_one(s, cpu); + if (cpu) { + total =3D kvm_dirty_ring_reap_one(s, cpu); + } else { + CPU_FOREACH(cpu) { + total +=3D kvm_dirty_ring_reap_one(s, cpu); + } } =20 if (total) { @@ -787,7 +790,7 @@ static uint64_t kvm_dirty_ring_reap_locked(KVMState *s) * Currently for simplicity, we must hold BQL before calling this. We can * consider to drop the BQL if we're clear with all the race conditions. */ -static uint64_t kvm_dirty_ring_reap(KVMState *s) +static uint64_t kvm_dirty_ring_reap(KVMState *s, CPUState *cpu) { uint64_t total; =20 @@ -807,7 +810,7 @@ static uint64_t kvm_dirty_ring_reap(KVMState *s) * reset below. */ kvm_slots_lock(); - total =3D kvm_dirty_ring_reap_locked(s); + total =3D kvm_dirty_ring_reap_locked(s, cpu); kvm_slots_unlock(); =20 return total; @@ -854,7 +857,7 @@ static void kvm_dirty_ring_flush(void) * vcpus out in a synchronous way. */ kvm_cpu_synchronize_kick_all(); - kvm_dirty_ring_reap(kvm_state); + kvm_dirty_ring_reap(kvm_state, NULL); trace_kvm_dirty_ring_flush(1); } =20 @@ -1398,7 +1401,7 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml, * Not easy. Let's cross the fingers until it's fixed. */ if (kvm_state->kvm_dirty_ring_size) { - kvm_dirty_ring_reap_locked(kvm_state); + kvm_dirty_ring_reap_locked(kvm_state, NULL); } else { kvm_slot_get_dirty_log(kvm_state, mem); } @@ -1470,7 +1473,7 @@ static void *kvm_dirty_ring_reaper_thread(void *data) r->reaper_state =3D KVM_DIRTY_RING_REAPER_REAPING; =20 qemu_mutex_lock_iothread(); - kvm_dirty_ring_reap(s); + kvm_dirty_ring_reap(s, NULL); qemu_mutex_unlock_iothread(); =20 r->reaper_iteration++; @@ -2956,7 +2959,7 @@ int kvm_cpu_exec(CPUState *cpu) */ trace_kvm_dirty_ring_full(cpu->cpu_index); qemu_mutex_lock_iothread(); - kvm_dirty_ring_reap(kvm_state); + kvm_dirty_ring_reap(kvm_state, cpu); qemu_mutex_unlock_iothread(); ret =3D 0; break; --=20 1.8.3.1