On 2019/8/6 下午8:04, Jason Gunthorpe wrote:
On Mon, Aug 05, 2019 at 12:20:45PM +0800, Jason Wang wrote:
On 2019/8/2 下午8:46, Jason Gunthorpe wrote:
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
This must be a proper barrier, like a spinlock, mutex, or
synchronize_rcu.
I start wi
On Tue, Aug 06, 2019 at 09:36:58AM -0400, Michael S. Tsirkin wrote:
> On Tue, Aug 06, 2019 at 08:53:17AM -0300, Jason Gunthorpe wrote:
> > On Sun, Aug 04, 2019 at 04:07:17AM -0400, Michael S. Tsirkin wrote:
> > > > > > Also, why can't this just permanently GUP the pages? In fact, where
> > > > > >
On Tue, Aug 06, 2019 at 08:53:17AM -0300, Jason Gunthorpe wrote:
> On Sun, Aug 04, 2019 at 04:07:17AM -0400, Michael S. Tsirkin wrote:
> > > > > Also, why can't this just permanently GUP the pages? In fact, where
> > > > > does it put_page them anyhow? Worrying that 7f466 adds a get_user page
> > >
On Mon, Aug 05, 2019 at 12:20:45PM +0800, Jason Wang wrote:
>
> On 2019/8/2 下午8:46, Jason Gunthorpe wrote:
> > On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> > > > This must be a proper barrier, like a spinlock, mutex, or
> > > > synchronize_rcu.
> > >
> > > I start with synchroniz
On Sun, Aug 04, 2019 at 04:07:17AM -0400, Michael S. Tsirkin wrote:
> > > > Also, why can't this just permanently GUP the pages? In fact, where
> > > > does it put_page them anyhow? Worrying that 7f466 adds a get_user page
> > > > but does not add a put_page??
> >
> > You didn't answer this.. Why
On 2019/8/5 下午2:40, Michael S. Tsirkin wrote:
On Mon, Aug 05, 2019 at 12:41:45PM +0800, Jason Wang wrote:
On 2019/8/5 下午12:36, Jason Wang wrote:
On 2019/8/2 下午10:27, Michael S. Tsirkin wrote:
On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
On Fri, Aug 02, 2019 at 05:40:07PM
On 2019/8/5 下午2:30, Michael S. Tsirkin wrote:
On Mon, Aug 05, 2019 at 12:36:40PM +0800, Jason Wang wrote:
On 2019/8/2 下午10:27, Michael S. Tsirkin wrote:
On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
This must be
On 2019/8/5 下午2:28, Michael S. Tsirkin wrote:
On Mon, Aug 05, 2019 at 12:33:45PM +0800, Jason Wang wrote:
On 2019/8/2 下午10:03, Michael S. Tsirkin wrote:
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
Btw, I come up another idea, that is to disable preemption when vhost thread
ne
On 2019/8/4 上午5:54, Michael S. Tsirkin wrote:
On Thu, Aug 01, 2019 at 04:06:13AM -0400, Jason Wang wrote:
On 2019/8/1 上午2:29, Michael S. Tsirkin wrote:
On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
We used to use RCU to synchronize MMU notifier with worker. This leads
calling s
On Mon, Aug 05, 2019 at 12:41:45PM +0800, Jason Wang wrote:
>
> On 2019/8/5 下午12:36, Jason Wang wrote:
> >
> > On 2019/8/2 下午10:27, Michael S. Tsirkin wrote:
> > > On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
> > > > On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
On Mon, Aug 05, 2019 at 12:36:40PM +0800, Jason Wang wrote:
>
> On 2019/8/2 下午10:27, Michael S. Tsirkin wrote:
> > On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
> > > On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> > > > > This must be a proper barrier, like a spin
On Mon, Aug 05, 2019 at 12:33:45PM +0800, Jason Wang wrote:
>
> On 2019/8/2 下午10:03, Michael S. Tsirkin wrote:
> > On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> > > Btw, I come up another idea, that is to disable preemption when vhost
> > > thread
> > > need to access the memory.
On 2019/8/5 下午12:36, Jason Wang wrote:
On 2019/8/2 下午10:27, Michael S. Tsirkin wrote:
On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
This must be a proper barrier, like a spinlock, mutex, or
synchronize_rcu.
I s
On 2019/8/4 下午4:07, Michael S. Tsirkin wrote:
On Sat, Aug 03, 2019 at 09:14:00PM -0300, Jason Gunthorpe wrote:
On Sat, Aug 03, 2019 at 05:36:13PM -0400, Michael S. Tsirkin wrote:
On Fri, Aug 02, 2019 at 02:24:18PM -0300, Jason Gunthorpe wrote:
On Fri, Aug 02, 2019 at 10:27:21AM -0400, Michae
On 2019/8/2 下午10:27, Michael S. Tsirkin wrote:
On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
This must be a proper barrier, like a spinlock, mutex, or
synchronize_rcu.
I start with synchronize_rcu() but both you
On 2019/8/2 下午10:03, Michael S. Tsirkin wrote:
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
Btw, I come up another idea, that is to disable preemption when vhost thread
need to access the memory. Then register preempt notifier and if vhost
thread is preempted, we're sure no one
On 2019/8/2 下午8:46, Jason Gunthorpe wrote:
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
This must be a proper barrier, like a spinlock, mutex, or
synchronize_rcu.
I start with synchronize_rcu() but both you and Michael raise some
concern.
I've also idly wondered if calling sy
On Sat, Aug 03, 2019 at 09:14:00PM -0300, Jason Gunthorpe wrote:
> On Sat, Aug 03, 2019 at 05:36:13PM -0400, Michael S. Tsirkin wrote:
> > On Fri, Aug 02, 2019 at 02:24:18PM -0300, Jason Gunthorpe wrote:
> > > On Fri, Aug 02, 2019 at 10:27:21AM -0400, Michael S. Tsirkin wrote:
> > > > On Fri, Aug 0
On Sat, Aug 03, 2019 at 05:36:13PM -0400, Michael S. Tsirkin wrote:
> On Fri, Aug 02, 2019 at 02:24:18PM -0300, Jason Gunthorpe wrote:
> > On Fri, Aug 02, 2019 at 10:27:21AM -0400, Michael S. Tsirkin wrote:
> > > On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
> > > > On Fri, Aug 0
On Thu, Aug 01, 2019 at 04:06:13AM -0400, Jason Wang wrote:
> On 2019/8/1 上午2:29, Michael S. Tsirkin wrote:
> > On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
> >> We used to use RCU to synchronize MMU notifier with worker. This leads
> >> calling synchronize_rcu() in invalidate_range_
On Fri, Aug 02, 2019 at 02:24:18PM -0300, Jason Gunthorpe wrote:
> On Fri, Aug 02, 2019 at 10:27:21AM -0400, Michael S. Tsirkin wrote:
> > On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
> > > On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> > > > > This must be a prop
On Fri, Aug 02, 2019 at 10:27:21AM -0400, Michael S. Tsirkin wrote:
> On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
> > On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> > > > This must be a proper barrier, like a spinlock, mutex, or
> > > > synchronize_rcu.
> > >
>
On Fri, Aug 02, 2019 at 09:46:13AM -0300, Jason Gunthorpe wrote:
> On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> > > This must be a proper barrier, like a spinlock, mutex, or
> > > synchronize_rcu.
> >
> >
> > I start with synchronize_rcu() but both you and Michael raise some
> >
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> Btw, I come up another idea, that is to disable preemption when vhost thread
> need to access the memory. Then register preempt notifier and if vhost
> thread is preempted, we're sure no one will access the memory and can do the
> cleanu
On Fri, Aug 02, 2019 at 05:40:07PM +0800, Jason Wang wrote:
> > This must be a proper barrier, like a spinlock, mutex, or
> > synchronize_rcu.
>
>
> I start with synchronize_rcu() but both you and Michael raise some
> concern.
I've also idly wondered if calling synchronize_rcu() under the variou
On 2019/8/1 下午10:15, Jason Gunthorpe wrote:
On Thu, Aug 01, 2019 at 01:02:18PM +0800, Jason Wang wrote:
On 2019/8/1 上午3:30, Jason Gunthorpe wrote:
On Wed, Jul 31, 2019 at 09:28:20PM +0800, Jason Wang wrote:
On 2019/7/31 下午8:39, Jason Gunthorpe wrote:
On Wed, Jul 31, 2019 at 04:46:53AM -0400
On Thu, Aug 01, 2019 at 01:02:18PM +0800, Jason Wang wrote:
>
> On 2019/8/1 上午3:30, Jason Gunthorpe wrote:
> > On Wed, Jul 31, 2019 at 09:28:20PM +0800, Jason Wang wrote:
> > > On 2019/7/31 下午8:39, Jason Gunthorpe wrote:
> > > > On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
> > > > >
On 2019/8/1 上午2:29, Michael S. Tsirkin wrote:
> On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
>> We used to use RCU to synchronize MMU notifier with worker. This leads
>> calling synchronize_rcu() in invalidate_range_start(). But on a busy
>> system, there would be many factors that m
On 2019/8/1 上午3:30, Jason Gunthorpe wrote:
On Wed, Jul 31, 2019 at 09:28:20PM +0800, Jason Wang wrote:
On 2019/7/31 下午8:39, Jason Gunthorpe wrote:
On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
We used to use RCU to synchronize MMU notifier with worker. This leads
calling synchr
On Wed, Jul 31, 2019 at 09:28:20PM +0800, Jason Wang wrote:
>
> On 2019/7/31 下午8:39, Jason Gunthorpe wrote:
> > On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
> > > We used to use RCU to synchronize MMU notifier with worker. This leads
> > > calling synchronize_rcu() in invalidate_ran
On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
> We used to use RCU to synchronize MMU notifier with worker. This leads
> calling synchronize_rcu() in invalidate_range_start(). But on a busy
> system, there would be many factors that may slow down the
> synchronize_rcu() which makes it
On 2019/7/31 下午8:39, Jason Gunthorpe wrote:
On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
We used to use RCU to synchronize MMU notifier with worker. This leads
calling synchronize_rcu() in invalidate_range_start(). But on a busy
system, there would be many factors that may slow
On Wed, Jul 31, 2019 at 04:46:53AM -0400, Jason Wang wrote:
> We used to use RCU to synchronize MMU notifier with worker. This leads
> calling synchronize_rcu() in invalidate_range_start(). But on a busy
> system, there would be many factors that may slow down the
> synchronize_rcu() which makes it
On 2019/7/31 下午4:46, Jason Wang wrote:
We used to use RCU to synchronize MMU notifier with worker. This leads
calling synchronize_rcu() in invalidate_range_start(). But on a busy
system, there would be many factors that may slow down the
synchronize_rcu() which makes it unsuitable to be called
We used to use RCU to synchronize MMU notifier with worker. This leads
calling synchronize_rcu() in invalidate_range_start(). But on a busy
system, there would be many factors that may slow down the
synchronize_rcu() which makes it unsuitable to be called in MMU
notifier.
A solution is SRCU but it
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