From: Mike Christie <michael.christie@oracle.com> To: geert@linux-m68k.org, vverma@digitalocean.com, hdanton@sina.com, hch@infradead.org, stefanha@redhat.com, jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com, virtualization@lists.linux-foundation.org, christian.brauner@ubuntu.com, axboe@kernel.dk, linux-kernel@vger.kernel.org Cc: Christoph Hellwig <hch@lst.de> Subject: [PATCH V6 09/10] vhost: move worker thread fields to new struct Date: Mon, 29 Nov 2021 13:47:06 -0600 [thread overview] Message-ID: <20211129194707.5863-10-michael.christie@oracle.com> (raw) In-Reply-To: <20211129194707.5863-1-michael.christie@oracle.com> This is just a prep patch. It moves the worker related fields to a new vhost_worker struct and moves the code around to create some helpers that will be used in the next patch. Signed-off-by: Mike Christie <michael.christie@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> --- drivers/vhost/vhost.c | 98 ++++++++++++++++++++++++++++--------------- drivers/vhost/vhost.h | 11 +++-- 2 files changed, 72 insertions(+), 37 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 59edb5a1ffe2..c9a1f706989c 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -263,8 +263,8 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work) * sure it was not in the list. * test_and_set_bit() implies a memory barrier. */ - llist_add(&work->node, &dev->work_list); - wake_up_process(dev->worker); + llist_add(&work->node, &dev->worker->work_list); + wake_up_process(dev->worker->task); } } EXPORT_SYMBOL_GPL(vhost_work_queue); @@ -272,7 +272,7 @@ EXPORT_SYMBOL_GPL(vhost_work_queue); /* A lockless hint for busy polling code to exit the loop */ bool vhost_has_work(struct vhost_dev *dev) { - return !llist_empty(&dev->work_list); + return dev->worker && !llist_empty(&dev->worker->work_list); } EXPORT_SYMBOL_GPL(vhost_has_work); @@ -343,7 +343,8 @@ static void vhost_vq_reset(struct vhost_dev *dev, static int vhost_worker(void *data) { - struct vhost_dev *dev = data; + struct vhost_worker *worker = data; + struct vhost_dev *dev = worker->dev; struct vhost_work *work, *work_next; struct llist_node *node; @@ -358,7 +359,7 @@ static int vhost_worker(void *data) break; } - node = llist_del_all(&dev->work_list); + node = llist_del_all(&worker->work_list); if (!node) schedule(); @@ -368,7 +369,7 @@ static int vhost_worker(void *data) llist_for_each_entry_safe(work, work_next, node, node) { clear_bit(VHOST_WORK_QUEUED, &work->flags); __set_current_state(TASK_RUNNING); - kcov_remote_start_common(dev->kcov_handle); + kcov_remote_start_common(worker->kcov_handle); work->fn(work); kcov_remote_stop(); if (need_resched()) @@ -487,7 +488,6 @@ void vhost_dev_init(struct vhost_dev *dev, dev->byte_weight = byte_weight; dev->use_worker = use_worker; dev->msg_handler = msg_handler; - init_llist_head(&dev->work_list); init_waitqueue_head(&dev->wait); INIT_LIST_HEAD(&dev->read_list); INIT_LIST_HEAD(&dev->pending_list); @@ -579,10 +579,60 @@ static void vhost_detach_mm(struct vhost_dev *dev) dev->mm = NULL; } +static void vhost_worker_free(struct vhost_dev *dev) +{ + struct vhost_worker *worker = dev->worker; + + if (!worker) + return; + + dev->worker = NULL; + WARN_ON(!llist_empty(&worker->work_list)); + kthread_stop(worker->task); + kfree(worker); +} + +static int vhost_worker_create(struct vhost_dev *dev) +{ + struct vhost_worker *worker; + struct task_struct *task; + int ret; + + worker = kzalloc(sizeof(*worker), GFP_KERNEL_ACCOUNT); + if (!worker) + return -ENOMEM; + + dev->worker = worker; + worker->dev = dev; + worker->kcov_handle = kcov_common_handle(); + init_llist_head(&worker->work_list); + + task = kthread_create(vhost_worker, worker, "vhost-%d", current->pid); + if (IS_ERR(task)) { + ret = PTR_ERR(task); + goto free_worker; + } + + worker->task = task; + wake_up_process(task); /* avoid contributing to loadavg */ + + ret = vhost_attach_cgroups(dev); + if (ret) + goto stop_worker; + + return 0; + +stop_worker: + kthread_stop(worker->task); +free_worker: + kfree(worker); + dev->worker = NULL; + return ret; +} + /* Caller should have device mutex */ long vhost_dev_set_owner(struct vhost_dev *dev) { - struct task_struct *worker; int err; /* Is there an owner already? */ @@ -593,36 +643,21 @@ long vhost_dev_set_owner(struct vhost_dev *dev) vhost_attach_mm(dev); - dev->kcov_handle = kcov_common_handle(); if (dev->use_worker) { - worker = kthread_create(vhost_worker, dev, - "vhost-%d", current->pid); - if (IS_ERR(worker)) { - err = PTR_ERR(worker); - goto err_worker; - } - - dev->worker = worker; - wake_up_process(worker); /* avoid contributing to loadavg */ - - err = vhost_attach_cgroups(dev); + err = vhost_worker_create(dev); if (err) - goto err_cgroup; + goto err_worker; } err = vhost_dev_alloc_iovecs(dev); if (err) - goto err_cgroup; + goto err_iovecs; return 0; -err_cgroup: - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - } +err_iovecs: + vhost_worker_free(dev); err_worker: vhost_detach_mm(dev); - dev->kcov_handle = 0; err_mm: return err; } @@ -712,12 +747,7 @@ void vhost_dev_cleanup(struct vhost_dev *dev) dev->iotlb = NULL; vhost_clear_msg(dev); wake_up_interruptible_poll(&dev->wait, EPOLLIN | EPOLLRDNORM); - WARN_ON(!llist_empty(&dev->work_list)); - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - dev->kcov_handle = 0; - } + vhost_worker_free(dev); vhost_detach_mm(dev); } EXPORT_SYMBOL_GPL(vhost_dev_cleanup); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 638bb640d6b4..102ce25e4e13 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -25,6 +25,13 @@ struct vhost_work { unsigned long flags; }; +struct vhost_worker { + struct task_struct *task; + struct llist_head work_list; + struct vhost_dev *dev; + u64 kcov_handle; +}; + /* Poll a file (eventfd or socket) */ /* Note: there's nothing vhost specific about this structure. */ struct vhost_poll { @@ -148,8 +155,7 @@ struct vhost_dev { struct vhost_virtqueue **vqs; int nvqs; struct eventfd_ctx *log_ctx; - struct llist_head work_list; - struct task_struct *worker; + struct vhost_worker *worker; struct vhost_iotlb *umem; struct vhost_iotlb *iotlb; spinlock_t iotlb_lock; @@ -159,7 +165,6 @@ struct vhost_dev { int iov_limit; int weight; int byte_weight; - u64 kcov_handle; bool use_worker; int (*msg_handler)(struct vhost_dev *dev, struct vhost_iotlb_msg *msg); -- 2.25.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
WARNING: multiple messages have this Message-ID (diff)
From: Mike Christie <michael.christie@oracle.com> To: geert@linux-m68k.org, vverma@digitalocean.com, hdanton@sina.com, hch@infradead.org, stefanha@redhat.com, jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com, virtualization@lists.linux-foundation.org, christian.brauner@ubuntu.com, axboe@kernel.dk, linux-kernel@vger.kernel.org Cc: Mike Christie <michael.christie@oracle.com>, Christoph Hellwig <hch@lst.de> Subject: [PATCH V6 09/10] vhost: move worker thread fields to new struct Date: Mon, 29 Nov 2021 13:47:06 -0600 [thread overview] Message-ID: <20211129194707.5863-10-michael.christie@oracle.com> (raw) In-Reply-To: <20211129194707.5863-1-michael.christie@oracle.com> This is just a prep patch. It moves the worker related fields to a new vhost_worker struct and moves the code around to create some helpers that will be used in the next patch. Signed-off-by: Mike Christie <michael.christie@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> --- drivers/vhost/vhost.c | 98 ++++++++++++++++++++++++++++--------------- drivers/vhost/vhost.h | 11 +++-- 2 files changed, 72 insertions(+), 37 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 59edb5a1ffe2..c9a1f706989c 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -263,8 +263,8 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work) * sure it was not in the list. * test_and_set_bit() implies a memory barrier. */ - llist_add(&work->node, &dev->work_list); - wake_up_process(dev->worker); + llist_add(&work->node, &dev->worker->work_list); + wake_up_process(dev->worker->task); } } EXPORT_SYMBOL_GPL(vhost_work_queue); @@ -272,7 +272,7 @@ EXPORT_SYMBOL_GPL(vhost_work_queue); /* A lockless hint for busy polling code to exit the loop */ bool vhost_has_work(struct vhost_dev *dev) { - return !llist_empty(&dev->work_list); + return dev->worker && !llist_empty(&dev->worker->work_list); } EXPORT_SYMBOL_GPL(vhost_has_work); @@ -343,7 +343,8 @@ static void vhost_vq_reset(struct vhost_dev *dev, static int vhost_worker(void *data) { - struct vhost_dev *dev = data; + struct vhost_worker *worker = data; + struct vhost_dev *dev = worker->dev; struct vhost_work *work, *work_next; struct llist_node *node; @@ -358,7 +359,7 @@ static int vhost_worker(void *data) break; } - node = llist_del_all(&dev->work_list); + node = llist_del_all(&worker->work_list); if (!node) schedule(); @@ -368,7 +369,7 @@ static int vhost_worker(void *data) llist_for_each_entry_safe(work, work_next, node, node) { clear_bit(VHOST_WORK_QUEUED, &work->flags); __set_current_state(TASK_RUNNING); - kcov_remote_start_common(dev->kcov_handle); + kcov_remote_start_common(worker->kcov_handle); work->fn(work); kcov_remote_stop(); if (need_resched()) @@ -487,7 +488,6 @@ void vhost_dev_init(struct vhost_dev *dev, dev->byte_weight = byte_weight; dev->use_worker = use_worker; dev->msg_handler = msg_handler; - init_llist_head(&dev->work_list); init_waitqueue_head(&dev->wait); INIT_LIST_HEAD(&dev->read_list); INIT_LIST_HEAD(&dev->pending_list); @@ -579,10 +579,60 @@ static void vhost_detach_mm(struct vhost_dev *dev) dev->mm = NULL; } +static void vhost_worker_free(struct vhost_dev *dev) +{ + struct vhost_worker *worker = dev->worker; + + if (!worker) + return; + + dev->worker = NULL; + WARN_ON(!llist_empty(&worker->work_list)); + kthread_stop(worker->task); + kfree(worker); +} + +static int vhost_worker_create(struct vhost_dev *dev) +{ + struct vhost_worker *worker; + struct task_struct *task; + int ret; + + worker = kzalloc(sizeof(*worker), GFP_KERNEL_ACCOUNT); + if (!worker) + return -ENOMEM; + + dev->worker = worker; + worker->dev = dev; + worker->kcov_handle = kcov_common_handle(); + init_llist_head(&worker->work_list); + + task = kthread_create(vhost_worker, worker, "vhost-%d", current->pid); + if (IS_ERR(task)) { + ret = PTR_ERR(task); + goto free_worker; + } + + worker->task = task; + wake_up_process(task); /* avoid contributing to loadavg */ + + ret = vhost_attach_cgroups(dev); + if (ret) + goto stop_worker; + + return 0; + +stop_worker: + kthread_stop(worker->task); +free_worker: + kfree(worker); + dev->worker = NULL; + return ret; +} + /* Caller should have device mutex */ long vhost_dev_set_owner(struct vhost_dev *dev) { - struct task_struct *worker; int err; /* Is there an owner already? */ @@ -593,36 +643,21 @@ long vhost_dev_set_owner(struct vhost_dev *dev) vhost_attach_mm(dev); - dev->kcov_handle = kcov_common_handle(); if (dev->use_worker) { - worker = kthread_create(vhost_worker, dev, - "vhost-%d", current->pid); - if (IS_ERR(worker)) { - err = PTR_ERR(worker); - goto err_worker; - } - - dev->worker = worker; - wake_up_process(worker); /* avoid contributing to loadavg */ - - err = vhost_attach_cgroups(dev); + err = vhost_worker_create(dev); if (err) - goto err_cgroup; + goto err_worker; } err = vhost_dev_alloc_iovecs(dev); if (err) - goto err_cgroup; + goto err_iovecs; return 0; -err_cgroup: - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - } +err_iovecs: + vhost_worker_free(dev); err_worker: vhost_detach_mm(dev); - dev->kcov_handle = 0; err_mm: return err; } @@ -712,12 +747,7 @@ void vhost_dev_cleanup(struct vhost_dev *dev) dev->iotlb = NULL; vhost_clear_msg(dev); wake_up_interruptible_poll(&dev->wait, EPOLLIN | EPOLLRDNORM); - WARN_ON(!llist_empty(&dev->work_list)); - if (dev->worker) { - kthread_stop(dev->worker); - dev->worker = NULL; - dev->kcov_handle = 0; - } + vhost_worker_free(dev); vhost_detach_mm(dev); } EXPORT_SYMBOL_GPL(vhost_dev_cleanup); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 638bb640d6b4..102ce25e4e13 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -25,6 +25,13 @@ struct vhost_work { unsigned long flags; }; +struct vhost_worker { + struct task_struct *task; + struct llist_head work_list; + struct vhost_dev *dev; + u64 kcov_handle; +}; + /* Poll a file (eventfd or socket) */ /* Note: there's nothing vhost specific about this structure. */ struct vhost_poll { @@ -148,8 +155,7 @@ struct vhost_dev { struct vhost_virtqueue **vqs; int nvqs; struct eventfd_ctx *log_ctx; - struct llist_head work_list; - struct task_struct *worker; + struct vhost_worker *worker; struct vhost_iotlb *umem; struct vhost_iotlb *iotlb; spinlock_t iotlb_lock; @@ -159,7 +165,6 @@ struct vhost_dev { int iov_limit; int weight; int byte_weight; - u64 kcov_handle; bool use_worker; int (*msg_handler)(struct vhost_dev *dev, struct vhost_iotlb_msg *msg); -- 2.25.1
next prev parent reply other threads:[~2021-11-29 19:47 UTC|newest] Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-29 19:46 [PATCH V6 01/10] Use copy_process in vhost layer Mike Christie 2021-11-29 19:46 ` Mike Christie 2021-11-29 19:46 ` [PATCH V6 01/10] fork: Make IO worker options flag based Mike Christie 2021-11-29 19:46 ` Mike Christie 2021-11-29 19:46 ` [PATCH V6 02/10] fork/vm: Move common PF_IO_WORKER behavior to new flag Mike Christie 2021-11-29 19:46 ` Mike Christie 2021-11-29 19:47 ` [PATCH V6 03/10] fork: add USER_WORKER flag to not dup/clone files Mike Christie 2021-11-29 19:47 ` Mike Christie 2021-11-29 19:47 ` [PATCH V6 04/10] fork: Add USER_WORKER flag to ignore signals Mike Christie 2021-11-29 19:47 ` Mike Christie 2021-11-29 19:47 ` [PATCH V6 05/10] signal: Perfom autoreap for PF_USER_WORKER Mike Christie 2021-11-29 19:47 ` Mike Christie 2021-12-17 18:42 ` Eric W. Biederman 2021-12-17 18:42 ` Eric W. Biederman 2021-11-29 19:47 ` [PATCH V6 06/10] fork: add helpers to clone a process for kernel use Mike Christie 2021-11-29 19:47 ` Mike Christie 2021-12-17 18:53 ` Eric W. Biederman 2021-12-17 18:53 ` Eric W. Biederman 2021-11-29 19:47 ` [PATCH V6 07/10] io_uring: switch to user_worker Mike Christie 2021-11-29 19:47 ` Mike Christie 2021-11-29 19:47 ` [PATCH V6 08/10] fork: remove create_io_thread Mike Christie 2021-11-29 19:47 ` Mike Christie 2021-11-29 19:47 ` Mike Christie [this message] 2021-11-29 19:47 ` [PATCH V6 09/10] vhost: move worker thread fields to new struct Mike Christie 2021-11-29 19:47 ` [PATCH V6 10/10] vhost: use user_worker to check RLIMITs Mike Christie 2021-11-29 19:47 ` Mike Christie 2021-12-17 19:01 ` Eric W. Biederman 2021-12-17 19:01 ` Eric W. Biederman 2021-12-08 20:34 ` [PATCH V6 01/10] Use copy_process in vhost layer Michael S. Tsirkin 2021-12-08 20:34 ` Michael S. Tsirkin 2021-12-08 22:13 ` michael.christie 2021-12-08 22:13 ` michael.christie 2021-12-09 9:32 ` Christian Brauner 2021-12-17 19:26 ` Eric W. Biederman 2021-12-17 19:26 ` Eric W. Biederman 2021-12-17 22:08 ` michael.christie 2021-12-17 22:08 ` michael.christie 2021-12-22 0:20 ` Eric W. Biederman 2021-12-22 0:20 ` Eric W. Biederman 2021-12-22 17:32 ` Mike Christie 2021-12-22 17:32 ` Mike Christie 2021-12-22 18:24 ` Eric W. Biederman 2021-12-22 18:24 ` Eric W. Biederman 2021-12-22 20:25 ` Michael S. Tsirkin 2021-12-22 20:25 ` Michael S. Tsirkin 2022-01-17 16:41 ` Mike Christie 2022-01-17 16:41 ` Mike Christie 2022-01-17 17:31 ` Eric W. Biederman 2022-01-17 17:31 ` Eric W. Biederman 2022-01-18 18:51 ` Mike Christie 2022-01-18 18:51 ` Mike Christie 2022-01-18 19:00 ` Mike Christie 2022-01-18 19:00 ` Mike Christie 2022-01-18 19:12 ` Eric W. Biederman 2022-01-18 19:12 ` Eric W. Biederman 2022-02-02 21:02 ` Mike Christie 2022-02-02 21:02 ` Mike Christie
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20211129194707.5863-10-michael.christie@oracle.com \ --to=michael.christie@oracle.com \ --cc=axboe@kernel.dk \ --cc=christian.brauner@ubuntu.com \ --cc=geert@linux-m68k.org \ --cc=hch@infradead.org \ --cc=hch@lst.de \ --cc=hdanton@sina.com \ --cc=jasowang@redhat.com \ --cc=linux-kernel@vger.kernel.org \ --cc=mst@redhat.com \ --cc=sgarzare@redhat.com \ --cc=stefanha@redhat.com \ --cc=virtualization@lists.linux-foundation.org \ --cc=vverma@digitalocean.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.