On Thu, Dec 10, 2020 at 01:33:25PM -0600, Eric W. Biederman wrote:
> Peter Zijlstra writes:
>
> > On Tue, Dec 08, 2020 at 12:27:39PM -0600, Eric W. Biederman wrote:
> >> Peter Zijlstra writes:
> >>
> >> > On Mon, Dec 07, 2020 at 09:56:34AM -0600, Eric W. Biederman wrote:
> >> >
> >> >> Do you w
Peter Zijlstra writes:
> On Tue, Dec 08, 2020 at 12:27:39PM -0600, Eric W. Biederman wrote:
>> Peter Zijlstra writes:
>>
>> > On Mon, Dec 07, 2020 at 09:56:34AM -0600, Eric W. Biederman wrote:
>> >
>> >> Do you want to pull these two into a topic branch in the tip tree
>> >> based on v10-rc1?
>
On Tue, Dec 08, 2020 at 12:27:39PM -0600, Eric W. Biederman wrote:
> Peter Zijlstra writes:
>
> > On Mon, Dec 07, 2020 at 09:56:34AM -0600, Eric W. Biederman wrote:
> >
> >> Do you want to pull these two into a topic branch in the tip tree
> >> based on v10-rc1?
> >
> > I'll go do that. I'll let
Peter Zijlstra writes:
> On Mon, Dec 07, 2020 at 09:56:34AM -0600, Eric W. Biederman wrote:
>
>> Do you want to pull these two into a topic branch in the tip tree
>> based on v10-rc1?
>
> I'll go do that. I'll let the robots chew on it before pushing it out
> though, I'll reply once it's in tip.g
From: Waiman Long
> Sent: 08 December 2020 15:34
>
> On 12/8/20 4:12 AM, David Laight wrote:
> > From: Waiman Long
> >> Sent: 07 December 2020 19:02
> > ...
> >>> How much more difficult would it be to also add a timeout option?
> >>> I looked at adding one to the mutex code - and fell into a big
On 12/8/20 4:12 AM, David Laight wrote:
From: Waiman Long
Sent: 07 December 2020 19:02
...
How much more difficult would it be to also add a timeout option?
I looked at adding one to the mutex code - and fell into a big pile
of replicated code.
ISTM that one the initial locked exchange (and s
On Mon, Dec 07, 2020 at 09:56:34AM -0600, Eric W. Biederman wrote:
> Do you want to pull these two into a topic branch in the tip tree
> based on v10-rc1?
I'll go do that. I'll let the robots chew on it before pushing it out
though, I'll reply once it's in tip.git.
From: Peter Zijlstra
> Sent: 08 December 2020 12:32
>
> On Tue, Dec 08, 2020 at 09:12:36AM +, David Laight wrote:
> > From: Waiman Long
> > > Sent: 07 December 2020 19:02
> > ...
> > > > How much more difficult would it be to also add a timeout option?
> > > > I looked at adding one to the mut
On Tue, Dec 08, 2020 at 09:12:36AM +, David Laight wrote:
> From: Waiman Long
> > Sent: 07 December 2020 19:02
> ...
> > > How much more difficult would it be to also add a timeout option?
> > > I looked at adding one to the mutex code - and fell into a big pile
> > > of replicated code.
> > >
From: Waiman Long
> Sent: 07 December 2020 19:02
...
> > How much more difficult would it be to also add a timeout option?
> > I looked at adding one to the mutex code - and fell into a big pile
> > of replicated code.
> >
> > ISTM that one the initial locked exchange (and spin) fails a few
> > ext
On 12/7/20 11:58 AM, David Laight wrote:
From: Waiman Long
Sent: 07 December 2020 15:34
On 12/7/20 4:02 AM, Peter Zijlstra wrote:
On Thu, Dec 03, 2020 at 08:59:13PM -0500, Waiman Long wrote:
On 12/3/20 3:11 PM, Eric W. Biederman wrote:
+static inline int __down_read_interruptible(struct rw_s
From: Waiman Long
> Sent: 07 December 2020 15:34
>
> On 12/7/20 4:02 AM, Peter Zijlstra wrote:
> > On Thu, Dec 03, 2020 at 08:59:13PM -0500, Waiman Long wrote:
> >> On 12/3/20 3:11 PM, Eric W. Biederman wrote:
> >>> +static inline int __down_read_interruptible(struct rw_semaphore *sem)
> >>> +{
>
Peter Zijlstra writes:
> On Thu, Dec 03, 2020 at 08:59:13PM -0500, Waiman Long wrote:
>> On 12/3/20 3:11 PM, Eric W. Biederman wrote:
>
>> > +static inline int __down_read_interruptible(struct rw_semaphore *sem)
>> > +{
>> > + if (!rwsem_read_trylock(sem)) {
>> > + if (IS_ERR(rwsem_down
On 12/7/20 4:02 AM, Peter Zijlstra wrote:
On Thu, Dec 03, 2020 at 08:59:13PM -0500, Waiman Long wrote:
On 12/3/20 3:11 PM, Eric W. Biederman wrote:
+static inline int __down_read_interruptible(struct rw_semaphore *sem)
+{
+ if (!rwsem_read_trylock(sem)) {
+ if (IS_ERR(rwsem_
On Thu, Dec 03, 2020 at 08:59:13PM -0500, Waiman Long wrote:
> On 12/3/20 3:11 PM, Eric W. Biederman wrote:
> > +static inline int __down_read_interruptible(struct rw_semaphore *sem)
> > +{
> > + if (!rwsem_read_trylock(sem)) {
> > + if (IS_ERR(rwsem_down_read_slowpath(sem, TASK_INTERR
On 12/3/20 3:11 PM, Eric W. Biederman wrote:
In preparation for converting exec_update_mutex to a rwsem so that
multiple readers can execute in parallel and not deadlock, add
down_read_interruptible. This is needed for perf_event_open to be
converted (with no semantic changes) from working on a
In preparation for converting exec_update_mutex to a rwsem so that
multiple readers can execute in parallel and not deadlock, add
down_read_interruptible. This is needed for perf_event_open to be
converted (with no semantic changes) from working on a mutex to
wroking on a rwsem.
Cc: Peter Zijls
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