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Tsirkin" , Thomas Huth , Jason Wang , Alex Williamson , Peter Xu Subject: [PULL 04/25] migration/multifd: Remove p->quit from recv side Date: Wed, 28 Feb 2024 13:12:54 +0800 Message-ID: <20240228051315.400759-5-peterx@redhat.com> In-Reply-To: <20240228051315.400759-1-peterx@redhat.com> References: <20240228051315.400759-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 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=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.088, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1709097272977100002 Content-Type: text/plain; charset="utf-8" From: Fabiano Rosas Like we did on the sending side, replace the p->quit per-channel flag with a global atomic 'exiting' flag. Signed-off-by: Fabiano Rosas Reviewed-by: Peter Xu Link: https://lore.kernel.org/r/20240220224138.24759-5-farosas@suse.de Signed-off-by: Peter Xu --- migration/multifd.c | 41 ++++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 17 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index adfe8c9a0a..fba00b9e8f 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -79,6 +79,19 @@ struct { MultiFDMethods *ops; } *multifd_send_state; =20 +struct { + MultiFDRecvParams *params; + /* number of created threads */ + int count; + /* syncs main thread and channels */ + QemuSemaphore sem_sync; + /* global number of generated multifd packets */ + uint64_t packet_num; + int exiting; + /* multifd ops */ + MultiFDMethods *ops; +} *multifd_recv_state; + /* Multifd without compression */ =20 /** @@ -440,6 +453,11 @@ static bool multifd_send_should_exit(void) return qatomic_read(&multifd_send_state->exiting); } =20 +static bool multifd_recv_should_exit(void) +{ + return qatomic_read(&multifd_recv_state->exiting); +} + /* * The migration thread can wait on either of the two semaphores. This * function can be used to kick the main thread out of waiting on either of @@ -1063,24 +1081,16 @@ bool multifd_send_setup(void) return true; } =20 -struct { - MultiFDRecvParams *params; - /* number of created threads */ - int count; - /* syncs main thread and channels */ - QemuSemaphore sem_sync; - /* global number of generated multifd packets */ - uint64_t packet_num; - /* multifd ops */ - MultiFDMethods *ops; -} *multifd_recv_state; - static void multifd_recv_terminate_threads(Error *err) { int i; =20 trace_multifd_recv_terminate_threads(err !=3D NULL); =20 + if (qatomic_xchg(&multifd_recv_state->exiting, 1)) { + return; + } + if (err) { MigrationState *s =3D migrate_get_current(); migrate_set_error(s, err); @@ -1094,8 +1104,6 @@ static void multifd_recv_terminate_threads(Error *err) for (i =3D 0; i < migrate_multifd_channels(); i++) { MultiFDRecvParams *p =3D &multifd_recv_state->params[i]; =20 - qemu_mutex_lock(&p->mutex); - p->quit =3D true; /* * We could arrive here for two reasons: * - normal quit, i.e. everything went fine, just finished @@ -1105,7 +1113,6 @@ static void multifd_recv_terminate_threads(Error *err) if (p->c) { qio_channel_shutdown(p->c, QIO_CHANNEL_SHUTDOWN_BOTH, NULL); } - qemu_mutex_unlock(&p->mutex); } } =20 @@ -1210,7 +1217,7 @@ static void *multifd_recv_thread(void *opaque) while (true) { uint32_t flags; =20 - if (p->quit) { + if (multifd_recv_should_exit()) { break; } =20 @@ -1274,6 +1281,7 @@ int multifd_recv_setup(Error **errp) multifd_recv_state =3D g_malloc0(sizeof(*multifd_recv_state)); multifd_recv_state->params =3D g_new0(MultiFDRecvParams, thread_count); qatomic_set(&multifd_recv_state->count, 0); + qatomic_set(&multifd_recv_state->exiting, 0); qemu_sem_init(&multifd_recv_state->sem_sync, 0); multifd_recv_state->ops =3D multifd_ops[migrate_multifd_compression()]; =20 @@ -1282,7 +1290,6 @@ int multifd_recv_setup(Error **errp) =20 qemu_mutex_init(&p->mutex); qemu_sem_init(&p->sem_sync, 0); - p->quit =3D false; p->id =3D i; p->packet_len =3D sizeof(MultiFDPacket_t) + sizeof(uint64_t) * page_count; --=20 2.43.0