On Wed, Jul 15, 2015 at 09:08:15PM +0200, Oleg Nesterov wrote:
> On 07/15, Paul E. McKenney wrote:
> >
> > On Wed, Jul 15, 2015 at 08:15:11PM +0200, Peter Zijlstra wrote:
> > >
> > > No, it makes the read-side primitive contain an unconditional memory
> > > barrier, that forgoes the entire point.
>
On 07/15, Paul E. McKenney wrote:
>
> On Wed, Jul 15, 2015 at 08:15:11PM +0200, Peter Zijlstra wrote:
> >
> > No, it makes the read-side primitive contain an unconditional memory
> > barrier, that forgoes the entire point.
> >
> > The writers are stupidly expensive already for they need global
> >
On 07/15, Paul E. McKenney wrote:
>
> On Sun, Jul 12, 2015 at 01:35:48AM +0200, Oleg Nesterov wrote:
> > It is functionally equivalent to
> >
> > struct rcu_sync_struct {
> > atomic_t counter;
> > };
> >
> > static inline bool rcu_sync_is_idle(struct rcu_sync
On Wed, Jul 15, 2015 at 08:15:11PM +0200, Peter Zijlstra wrote:
> On Wed, Jul 15, 2015 at 11:05:46AM -0700, Paul E. McKenney wrote:
> > On Sun, Jul 12, 2015 at 01:35:48AM +0200, Oleg Nesterov wrote:
> > > It is functionally equivalent to
> > >
> > > struct rcu_sync_struct {
> > >
On Wed, Jul 15, 2015 at 11:05:46AM -0700, Paul E. McKenney wrote:
> On Sun, Jul 12, 2015 at 01:35:48AM +0200, Oleg Nesterov wrote:
> > It is functionally equivalent to
> >
> > struct rcu_sync_struct {
> > atomic_t counter;
> > };
> >
> > static inline bool
On Sun, Jul 12, 2015 at 01:35:48AM +0200, Oleg Nesterov wrote:
> It is functionally equivalent to
>
> struct rcu_sync_struct {
> atomic_t counter;
> };
>
> static inline bool rcu_sync_is_idle(struct rcu_sync_struct *rss)
> {
If you add an smp_mb()
It is functionally equivalent to
struct rcu_sync_struct {
atomic_t counter;
};
static inline bool rcu_sync_is_idle(struct rcu_sync_struct *rss)
{
return atomic_read(&rss->counter) == 0;
}
static inline void rcu_sync_
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