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X-Received-From: 2607:f8b0:400e:c00::243 Subject: [Qemu-devel] [PATCH v4 10/12] migration: create a dedicated thread to release rdma resource X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: adido@mellanox.com, qemu-devel@nongnu.org, Lidong Chen Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" ibv_dereg_mr wait for a long time for big memory size virtual server. The test result is: 10GB 326ms 20GB 699ms 30GB 1021ms 40GB 1387ms 50GB 1712ms 60GB 2034ms 70GB 2457ms 80GB 2807ms 90GB 3107ms 100GB 3474ms 110GB 3735ms 120GB 4064ms 130GB 4567ms 140GB 4886ms this will cause the guest os hang for a while when migration finished. So create a dedicated thread to release rdma resource. Signed-off-by: Lidong Chen --- migration/rdma.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/migration/rdma.c b/migration/rdma.c index dfa4f77..1b9e261 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -2979,12 +2979,12 @@ static void qio_channel_rdma_set_aio_fd_handler(QIO= Channel *ioc, } } =20 -static int qio_channel_rdma_close(QIOChannel *ioc, - Error **errp) +static void *qio_channel_rdma_close_thread(void *arg) { - QIOChannelRDMA *rioc =3D QIO_CHANNEL_RDMA(ioc); + QIOChannelRDMA *rioc =3D arg; RDMAContext *rdmain, *rdmaout; - trace_qemu_rdma_close(); + + rcu_register_thread(); =20 rdmain =3D rioc->rdmain; if (rdmain) { @@ -3009,6 +3009,19 @@ static int qio_channel_rdma_close(QIOChannel *ioc, g_free(rdmain); g_free(rdmaout); =20 + rcu_unregister_thread(); + return NULL; +} + +static int qio_channel_rdma_close(QIOChannel *ioc, + Error **errp) +{ + QemuThread t; + QIOChannelRDMA *rioc =3D QIO_CHANNEL_RDMA(ioc); + trace_qemu_rdma_close(); + + qemu_thread_create(&t, "rdma cleanup", qio_channel_rdma_close_thread, + rioc, QEMU_THREAD_DETACHED); return 0; } =20 --=20 1.8.3.1