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bh=w0nkvQYI5RGRxsFjUD91f2WONLDlvHrVWt56hOA4xfc=; b=XwE5CUHpbp468wBeHxQYf7lhAaCmmK+U8Rxaw7723AzldSZMYJI7Avc5EqyYY404toTEVs qENMMlirsxMp9P4xXKQxLUazd3F4UXGH0fMwenIUu0+djJBtVS/X5Z/6VTmCrxYOXa5Cxo QfAYfCSs6RirHxwY3Marp3zGsnouubk= X-MC-Unique: 4CA8ct6aNvaIpKt0s6r2Hw-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, aiyutao@huawei.com, peter.maydell@linaro.org, vgoyal@redhat.com, lersek@redhat.com, alex.chen@huawei.com, armbru@redhat.com, tu.guoyi@h3c.com Subject: [PULL 05/15] virtiofsd: Use --thread-pool-size=0 to mean no thread pool Date: Fri, 18 Dec 2020 10:41:07 +0000 Message-Id: <20201218104117.199096-6-dgilbert@redhat.com> In-Reply-To: <20201218104117.199096-1-dgilbert@redhat.com> References: <20201218104117.199096-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=216.205.24.124; envelope-from=dgilbert@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_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: stefanha@redhat.com, quintela@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Vivek Goyal Right now we create a thread pool and main thread hands over the request to thread in thread pool to process. Number of threads in thread pool can be managed by option --thread-pool-size. In tests we have noted that many of the workloads are getting better performance if we don't use a thread pool at all and process all the requests in the context of a thread receiving the request. Hence give user an option to be able to run virtiofsd without using a thread pool. To implement this, I have used existing option --thread-pool-size. This option defines how many maximum threads can be in the thread pool. Thread pool size zero freezes thead pool. I can't see why will one start virtiofsd with a frozen thread pool (hence frozen file system). So I am redefining --thread-pool-size=3D0 to mean, don't use a thread pool. Instead process the request in the context of thread receiving request from the queue. Signed-off-by: Vivek Goyal Message-Id: <20201109143548.GA1479853@redhat.com> Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Stefan Hajnoczi Signed-off-by: Dr. David Alan Gilbert --- tools/virtiofsd/fuse_virtio.c | 36 ++++++++++++++++++++++++++--------- 1 file changed, 27 insertions(+), 9 deletions(-) diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index b264dcbd18..ddcefee427 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -578,13 +578,18 @@ static void *fv_queue_thread(void *opaque) struct VuDev *dev =3D &qi->virtio_dev->dev; struct VuVirtq *q =3D vu_get_queue(dev, qi->qidx); struct fuse_session *se =3D qi->virtio_dev->se; - GThreadPool *pool; - - pool =3D g_thread_pool_new(fv_queue_worker, qi, se->thread_pool_size, = FALSE, - NULL); - if (!pool) { - fuse_log(FUSE_LOG_ERR, "%s: g_thread_pool_new failed\n", __func__); - return NULL; + GThreadPool *pool =3D NULL; + GList *req_list =3D NULL; + + if (se->thread_pool_size) { + fuse_log(FUSE_LOG_DEBUG, "%s: Creating thread pool for Queue %d\n", + __func__, qi->qidx); + pool =3D g_thread_pool_new(fv_queue_worker, qi, se->thread_pool_si= ze, + FALSE, NULL); + if (!pool) { + fuse_log(FUSE_LOG_ERR, "%s: g_thread_pool_new failed\n", __fun= c__); + return NULL; + } } =20 fuse_log(FUSE_LOG_INFO, "%s: Start for queue %d kick_fd %d\n", __func_= _, @@ -659,14 +664,27 @@ static void *fv_queue_thread(void *opaque) =20 req->reply_sent =3D false; =20 - g_thread_pool_push(pool, req, NULL); + if (!se->thread_pool_size) { + req_list =3D g_list_prepend(req_list, req); + } else { + g_thread_pool_push(pool, req, NULL); + } } =20 pthread_mutex_unlock(&qi->vq_lock); pthread_rwlock_unlock(&qi->virtio_dev->vu_dispatch_rwlock); + + /* Process all the requests. */ + if (!se->thread_pool_size && req_list !=3D NULL) { + g_list_foreach(req_list, fv_queue_worker, qi); + g_list_free(req_list); + req_list =3D NULL; + } } =20 - g_thread_pool_free(pool, FALSE, TRUE); + if (pool) { + g_thread_pool_free(pool, FALSE, TRUE); + } =20 return NULL; } --=20 2.29.2