Enables the uverbs_remove_one to succeed despite the fact that there are
running IB applications working with the given ib device. This functionality
enables a HW device to be unbind/reset despite the fact that there are running
user space applications using it.
It exposes a new IB kernel API nam
On Wed, May 13, 2015 at 02:10:36PM +0300, Yishai Hadas wrote:
> + struct srcu_struct disassociate_srcu;
There is no need for rcu for this, use a rw sem.
> @@ -1326,6 +1327,13 @@ ssize_t ib_uverbs_create_comp_channel(struct
> ib_uverbs_file *file,
> return
On Mon, 2015-05-25 at 10:54 -0600, Jason Gunthorpe wrote:
> On Wed, May 13, 2015 at 02:10:36PM +0300, Yishai Hadas wrote:
>
> > + struct srcu_struct disassociate_srcu;
>
> There is no need for rcu for this, use a rw sem.
The rcu was used becuase it's on the hot path I assu
On Wed, May 27, 2015 at 12:04:29PM -0400, Doug Ledford wrote:
> On Mon, 2015-05-25 at 10:54 -0600, Jason Gunthorpe wrote:
> > On Wed, May 13, 2015 at 02:10:36PM +0300, Yishai Hadas wrote:
> >
> > > + struct srcu_struct disassociate_srcu;
> >
> > There is no need for rcu for t
On 5/27/2015 7:04 PM, Doug Ledford wrote:
On Mon, 2015-05-25 at 10:54 -0600, Jason Gunthorpe wrote:
On Wed, May 13, 2015 at 02:10:36PM +0300, Yishai Hadas wrote:
+ struct srcu_struct disassociate_srcu;
There is no need for rcu for this, use a rw sem.
The rcu was
On Wed, May 27, 2015 at 8:43 PM, Jason Gunthorpe
wrote:
> On Wed, May 27, 2015 at 12:04:29PM -0400, Doug Ledford wrote:
>> On Mon, 2015-05-25 at 10:54 -0600, Jason Gunthorpe wrote:
>> > On Wed, May 13, 2015 at 02:10:36PM +0300, Yishai Hadas wrote:
>> >
>> > > + struct srcu_struct
On Thu, 2015-05-28 at 00:36 +0300, Or Gerlitz wrote:
> On Wed, May 27, 2015 at 8:43 PM, Jason Gunthorpe
> wrote:
> > On Wed, May 27, 2015 at 12:04:29PM -0400, Doug Ledford wrote:
> >> On Mon, 2015-05-25 at 10:54 -0600, Jason Gunthorpe wrote:
> >> > On Wed, May 13, 2015 at 02:10:36PM +0300, Yishai
On Wed, May 27, 2015 at 11:47:31PM +0300, Yishai Hadas wrote:
> That's correct, it was chosen from performance reasons to enable parallel
> commands as part of ib_uverbs_write with minimum synchronization overhead
> comparing the rwsem.
The locking scheme makes no sense, see my other email, design
Hi,
> From: Jason Gunthorpe [mailto:jguntho...@obsidianresearch.com]
> Sent: Thursday, May 28, 2015 9:19 AM
> Subject: Re: [PATCH V3 for-next 1/3] IB/uverbs: Enable device removal
> when there are active user space applications
>
> On Wed, May 27, 2015 at 11:47:31PM +0300,
On Fri, May 29, 2015 at 10:30:52AM +, Shachar Raindel wrote:
> > The locking scheme makes no sense, see my other email, design it for a
> > rwsem and then consider rcu if necessary.
>
> Jason, the RCU based scheme is important, as it allows the performance
> critical path (verbs such as ibv_re
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