Change Details

We used to use the number of inactive queue scans as a measure of how many clean pages were being reclaimed by the page daemon. This was used to decide how to launder a small number of dirty pages. With r329882, we now scan the inactive queue more frequently, freeing a smaller number of pages each time. Thus, the number of scans isn't as useful a metric and we now launder too often. Rather than counting scans, just count the total number of clean pages freed during inactive queue scans. The laundry thread adds this value into an accumulator which gets cleared once the background laundering threshold is reached. This way we consider only the number of pages freed rather than the number of scans.

We used to use the number of inactive queue scans as a measure of how many clean pages were being reclaimed by the page daemon. This was used to decide how often to launder a small number of dirty pages. With r329882, we now scan the inactive queue more frequently, freeing a smaller number of pages each time. Thus, the number of scans isn't as useful a metric and we now launder too often. Rather than counting scans, just count the total number of clean pages freed during inactive queue scans. The laundry thread adds this value into an accumulator which gets cleared once the background laundering threshold is reached. This way we consider only the number of pages freed rather than the number of scans.

We used to use the number of inactive queue scans as a measure of how many clean pages were being reclaimed by the page daemon. This was used to decide how often to launder a small number of dirty pages. With r329882, we now scan the inactive queue more frequently, freeing a smaller number of pages each time. Thus, the number of scans isn't as useful a metric and we now launder too often. Rather than counting scans, just count the total number of clean pages freed during inactive queue scans. The laundry thread adds this value into an accumulator which gets cleared once the background laundering threshold is reached. This way we consider only the number of pages freed rather than the number of scans.