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bh=6eNEoeXfc5ez3tr2mQ5dzlA3PIZzEWSh+pM9YsqJQCs=; b=IOxo0LpDCXl5KZXsZnKYBZ8FlXS/KogOgIlhRDaxHJDtHd2LTsjHj/MFgKmZgpW870CyvU TL2gF/MbByBX5+zivdiFh3Sgi/Rued6Yq4Ej658G12w40WNRGkIEp8YZp/xbN6KNkuu+kB q/4hJmRJkXVf7z/Cbbv5f/uOl1nYuDU= X-MC-Unique: guXbQ1L6NzeDBzMI5vAoAQ-1 Date: Thu, 5 Nov 2020 14:44:16 -0500 From: Vivek Goyal To: qemu-devel@nongnu.org, virtio-fs-list Subject: [PATCH] virtiofsd: Use --thread-pool-size=0 to mean no thread pool Message-ID: <20201105194416.GA1384085@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vgoyal@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline 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=63.128.21.124; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/04 22:46:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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_H5=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: jose.carlos.venegas.munoz@intel.com, "Dr. David Alan Gilbert" , Stefan Hajnoczi Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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. There is a chance that in case of some workloads, we might get better performance if we don't handover the request to a different thread and process in the context of thread receiving the request. To implement that, redefine the meaning of --thread-pool-size=3D0 to mean that don't use a thread pool. Instead process the request in the context of thread receiving request from the queue. I can't think how --thread-pool-size=3D0 is useful and hence using that. If it is already useful somehow, I could look at defining a new option say "--no-thread-pool". I think this patch will be used more as a debug help to do comparison when it is more effecient to do not hand over the requests to a thread pool. Signed-off-by: Vivek Goyal --- tools/virtiofsd/fuse_virtio.c | 33 ++++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index ff86f6d1ce..60aa7cd3e5 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -695,13 +695,17 @@ 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_= _, @@ -780,14 +784,25 @@ static void *fv_queue_thread(void *opaque) req->bad_in_num =3D bad_in_num; req->bad_out_num =3D bad_out_num; =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 2.25.4