On 07/23/2018 12:04 AM, Davidlohr Bueso wrote:
> On Wed, 18 Jul 2018, Waiman Long wrote:
>
>> The key here is that we don't want other incoming readers to observe
>> that there are waiters in the wait queue and hence have to go into the
>> slowpath until the single waiter in the queue is sure that
On Wed, 18 Jul 2018, Waiman Long wrote:
The key here is that we don't want other incoming readers to observe
that there are waiters in the wait queue and hence have to go into the
slowpath until the single waiter in the queue is sure that it probably
will need to go to sleep if there is writer.
On 07/18/2018 12:16 PM, Peter Zijlstra wrote:
> On Fri, Jul 13, 2018 at 02:30:53PM -0400, Waiman Long wrote:
>> It was discovered that a constant stream of readers might cause the
>> count to go negative most of the time after an initial trigger by a
>> writer even if no writer was present afterwar
On Fri, Jul 13, 2018 at 02:30:53PM -0400, Waiman Long wrote:
> It was discovered that a constant stream of readers might cause the
> count to go negative most of the time after an initial trigger by a
> writer even if no writer was present afterward. As a result, most of the
> readers would have to
On 07/13/2018 02:30 PM, Waiman Long wrote:
> It was discovered that a constant stream of readers might cause the
> count to go negative most of the time after an initial trigger by a
> writer even if no writer was present afterward. As a result, most of the
> readers would have to go through the sl
It was discovered that a constant stream of readers might cause the
count to go negative most of the time after an initial trigger by a
writer even if no writer was present afterward. As a result, most of the
readers would have to go through the slowpath reducing their performance.
To avoid that f
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