* [PATCH] vhost: Make use of the helper macro kthread_run()
@ 2022-01-27 2:08 Yin Xiujiang
2022-01-27 8:31 ` Jason Wang
2022-01-27 12:41 ` Michael S. Tsirkin
0 siblings, 2 replies; 6+ messages in thread
From: Yin Xiujiang @ 2022-01-27 2:08 UTC (permalink / raw)
To: mst, jasowang; +Cc: kvm, virtualization, netdev, linux-kernel, yinxiujiang
Repalce kthread_create/wake_up_process() with kthread_run()
to simplify the code.
Signed-off-by: Yin Xiujiang <yinxiujiang@kylinos.cn>
---
drivers/vhost/vhost.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 59edb5a1ffe2..19e9eda9fc71 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -595,7 +595,7 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
dev->kcov_handle = kcov_common_handle();
if (dev->use_worker) {
- worker = kthread_create(vhost_worker, dev,
+ worker = kthread_run(vhost_worker, dev,
"vhost-%d", current->pid);
if (IS_ERR(worker)) {
err = PTR_ERR(worker);
@@ -603,7 +603,6 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
}
dev->worker = worker;
- wake_up_process(worker); /* avoid contributing to loadavg */
err = vhost_attach_cgroups(dev);
if (err)
--
2.30.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] vhost: Make use of the helper macro kthread_run()
2022-01-27 2:08 [PATCH] vhost: Make use of the helper macro kthread_run() Yin Xiujiang
@ 2022-01-27 8:31 ` Jason Wang
2022-01-27 12:41 ` Michael S. Tsirkin
1 sibling, 0 replies; 6+ messages in thread
From: Jason Wang @ 2022-01-27 8:31 UTC (permalink / raw)
To: Yin Xiujiang; +Cc: mst, kvm, virtualization, netdev, linux-kernel
On Thu, Jan 27, 2022 at 10:08 AM Yin Xiujiang <yinxiujiang@kylinos.cn> wrote:
>
> Repalce kthread_create/wake_up_process() with kthread_run()
> to simplify the code.
>
> Signed-off-by: Yin Xiujiang <yinxiujiang@kylinos.cn>
> ---
> drivers/vhost/vhost.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index 59edb5a1ffe2..19e9eda9fc71 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -595,7 +595,7 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
>
> dev->kcov_handle = kcov_common_handle();
> if (dev->use_worker) {
> - worker = kthread_create(vhost_worker, dev,
> + worker = kthread_run(vhost_worker, dev,
> "vhost-%d", current->pid);
Mike plans to introduce user_worker_create() to allow rlimit check[1].
So this is probably not needed.
Thanks
[1] https://www.spinics.net/lists/kernel/msg4161030.html (I'm not sure
this is the recent version, please check the list)
> if (IS_ERR(worker)) {
> err = PTR_ERR(worker);
> @@ -603,7 +603,6 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
> }
>
> dev->worker = worker;
> - wake_up_process(worker); /* avoid contributing to loadavg */
>
> err = vhost_attach_cgroups(dev);
> if (err)
> --
> 2.30.0
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] vhost: Make use of the helper macro kthread_run()
2022-01-27 2:08 [PATCH] vhost: Make use of the helper macro kthread_run() Yin Xiujiang
2022-01-27 8:31 ` Jason Wang
@ 2022-01-27 12:41 ` Michael S. Tsirkin
1 sibling, 0 replies; 6+ messages in thread
From: Michael S. Tsirkin @ 2022-01-27 12:41 UTC (permalink / raw)
To: Yin Xiujiang; +Cc: jasowang, kvm, virtualization, netdev, linux-kernel
On Thu, Jan 27, 2022 at 10:08:07AM +0800, Yin Xiujiang wrote:
> Repalce kthread_create/wake_up_process() with kthread_run()
> to simplify the code.
>
> Signed-off-by: Yin Xiujiang <yinxiujiang@kylinos.cn>
> ---
> drivers/vhost/vhost.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index 59edb5a1ffe2..19e9eda9fc71 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -595,7 +595,7 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
>
> dev->kcov_handle = kcov_common_handle();
> if (dev->use_worker) {
> - worker = kthread_create(vhost_worker, dev,
> + worker = kthread_run(vhost_worker, dev,
> "vhost-%d", current->pid);
> if (IS_ERR(worker)) {
> err = PTR_ERR(worker);
> @@ -603,7 +603,6 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
> }
>
> dev->worker = worker;
> - wake_up_process(worker); /* avoid contributing to loadavg */
>
> err = vhost_attach_cgroups(dev);
> if (err)
I think if you do this, you need to set dev->worker earlier.
> --
> 2.30.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] vhost: Make use of the helper macro kthread_run()
@ 2021-10-21 8:44 Cai Huoqing
2021-10-27 20:02 ` Michael S. Tsirkin
0 siblings, 1 reply; 6+ messages in thread
From: Cai Huoqing @ 2021-10-21 8:44 UTC (permalink / raw)
To: caihuoqing
Cc: Michael S. Tsirkin, Jason Wang, kvm, virtualization, netdev,
linux-kernel
Repalce kthread_create/wake_up_process() with kthread_run()
to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
drivers/vhost/vhost.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 59edb5a1ffe2..e67bd5603b5f 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -595,15 +595,15 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
dev->kcov_handle = kcov_common_handle();
if (dev->use_worker) {
- worker = kthread_create(vhost_worker, dev,
- "vhost-%d", current->pid);
+ /* avoid contributing to loadavg */
+ worker = kthread_run(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);
if (err)
--
2.25.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] vhost: Make use of the helper macro kthread_run()
2021-10-21 8:44 Cai Huoqing
@ 2021-10-27 20:02 ` Michael S. Tsirkin
2021-10-27 20:12 ` Mike Christie
0 siblings, 1 reply; 6+ messages in thread
From: Michael S. Tsirkin @ 2021-10-27 20:02 UTC (permalink / raw)
To: Cai Huoqing
Cc: Jason Wang, kvm, virtualization, netdev, linux-kernel,
Mike Christie
On Thu, Oct 21, 2021 at 04:44:06PM +0800, Cai Huoqing wrote:
> Repalce kthread_create/wake_up_process() with kthread_run()
> to simplify the code.
>
> Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Pls check how this interacts with Mike Christie's patches.
Pls fix up the typo in the commit log.
> ---
> drivers/vhost/vhost.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index 59edb5a1ffe2..e67bd5603b5f 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -595,15 +595,15 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
>
> dev->kcov_handle = kcov_common_handle();
> if (dev->use_worker) {
> - worker = kthread_create(vhost_worker, dev,
> - "vhost-%d", current->pid);
> + /* avoid contributing to loadavg */
doesn't this comment have any value anymore?
> + worker = kthread_run(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);
> if (err)
> --
> 2.25.1
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] vhost: Make use of the helper macro kthread_run()
2021-10-27 20:02 ` Michael S. Tsirkin
@ 2021-10-27 20:12 ` Mike Christie
0 siblings, 0 replies; 6+ messages in thread
From: Mike Christie @ 2021-10-27 20:12 UTC (permalink / raw)
To: Michael S. Tsirkin, Cai Huoqing
Cc: Jason Wang, kvm, virtualization, netdev, linux-kernel
On 10/27/21 3:02 PM, Michael S. Tsirkin wrote:
> On Thu, Oct 21, 2021 at 04:44:06PM +0800, Cai Huoqing wrote:
>> Repalce kthread_create/wake_up_process() with kthread_run()
>> to simplify the code.
>>
>> Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
>
> Pls check how this interacts with Mike Christie's patches.
> Pls fix up the typo in the commit log.
>
Hi Cai,
We probably don't need this patch since it's an API cleanup and
not fixing a bug. I'm replacing this code with the kernel_worker API
with this patch
https://lore.kernel.org/all/20211007214448.6282-9-michael.christie@oracle.com/
in this patchset;
https://lore.kernel.org/all/20211007214448.6282-1-michael.christie@oracle.com/
so the issue of using kthread_create + wake_up_process will be
gone shortly either way.
^ permalink raw reply [flat|nested] 6+ messages in thread
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