K 10 svn:author V 5 markj K 8 svn:date V 27 2016-08-22T01:41:03.933341Z K 7 svn:log V 540 Rework the background laundering target after r304442. Now that we launder less frequently and at a rate proportional to the ratio of dirty to clean inactive pages, we want to process more pages during each background laundering run. Launder a constant number of pages, derived from the amount of system memory. Cap the rate at which pages are laundered to 4MB/s and add a check to ensure we don't launder too much on larger-memory systems if page daemon wakeups are infrequent and the number of dirty pages is large. Discussed with: alc END