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bh=jsrXu9wL6HcpTtqw1FtRK4iQ5uaKV2xOq9pWRRptEL8=; b=CzmQQrkKgHDHN3U7qZDSzB+sXYHDj4UCiMIRPFp7mAtQyBI0sTGtWOb87vzFwaWUacT7TO 42WncNale9q6hnnGSom3OqeG+cFUJ7fSfLSvHnxpQuvfQmG/5/FEQCnsy6ZAh46kAYNVn1 MyAi2UIZXuLMQxhWKKXBRKuIjHQIIAM= X-MC-Unique: j1CYt137MTmZ5Tzto6LhuQ-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Juan Quintela , Marcel Apfelbaum , Yanan Wang , Markus Armbruster , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , "Dr. David Alan Gilbert" , Eduardo Habkost , Eric Blake Subject: [PATCH v2 07/11] multifd: Prepare to send a packet without the mutex held Date: Mon, 30 Jan 2023 09:09:52 +0100 Message-Id: <20230130080956.3047-8-quintela@redhat.com> In-Reply-To: <20230130080956.3047-1-quintela@redhat.com> References: <20230130080956.3047-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1675066286520100009 Content-Type: text/plain; charset="utf-8" We do the send_prepare() and the fill of the head packet without the mutex held. It will help a lot for compression and later in the series for zero pages. Notice that we can use p->pages without holding p->mutex because p->pending_job =3D=3D 1. Signed-off-by: Juan Quintela --- migration/multifd.h | 2 ++ migration/multifd.c | 12 ++++++------ 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/migration/multifd.h b/migration/multifd.h index a67cefc0a2..cd389d18d2 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -109,7 +109,9 @@ typedef struct { /* array of pages to sent. * The owner of 'pages' depends of 'pending_job' value: * pending_job =3D=3D 0 -> migration_thread can use it. + * No need for mutex lock. * pending_job !=3D 0 -> multifd_channel can use it. + * No need for mutex lock. */ MultiFDPages_t *pages; =20 diff --git a/migration/multifd.c b/migration/multifd.c index 77196a55b4..7ebaca6e55 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -672,6 +672,8 @@ static void *multifd_send_thread(void *opaque) p->flags |=3D MULTIFD_FLAG_SYNC; p->sync_needed =3D false; } + qemu_mutex_unlock(&p->mutex); + p->normal_num =3D 0; =20 if (use_zero_copy_send) { @@ -688,16 +690,10 @@ static void *multifd_send_thread(void *opaque) if (p->normal_num) { ret =3D multifd_send_state->ops->send_prepare(p, &local_er= r); if (ret !=3D 0) { - qemu_mutex_unlock(&p->mutex); break; } } multifd_send_fill_packet(p); - p->num_packets++; - p->total_normal_pages +=3D p->normal_num; - p->pages->num =3D 0; - p->pages->block =3D NULL; - qemu_mutex_unlock(&p->mutex); =20 trace_multifd_send(p->id, packet_num, p->normal_num, p->flags, p->next_packet_size); @@ -722,6 +718,10 @@ static void *multifd_send_thread(void *opaque) } =20 qemu_mutex_lock(&p->mutex); + p->num_packets++; + p->total_normal_pages +=3D p->normal_num; + p->pages->num =3D 0; + p->pages->block =3D NULL; p->sent_bytes +=3D p->packet_len; p->sent_bytes +=3D p->next_packet_size; p->pending_job--; --=20 2.39.1