On Fri, Feb 24, 2017 at 01:31:47PM -0800, Shaohua Li wrote: > When memory pressure is high, we free MADV_FREE pages. If the pages are > not dirty in pte, the pages could be freed immediately. Otherwise we > can't reclaim them. We put the pages back to anonumous LRU list (by > setting SwapBacked flag) and the pages will be reclaimed in normal > swapout way. > > We use normal page reclaim policy. Since MADV_FREE pages are put into > inactive file list, such pages and inactive file pages are reclaimed > according to their age. This is expected, because we don't want to > reclaim too many MADV_FREE pages before used once pages. > > Based on Minchan's original patch > > Cc: Michal Hocko <[email protected]> > Cc: Minchan Kim <[email protected]> > Cc: Hugh Dickins <[email protected]> > Cc: Johannes Weiner <[email protected]> > Cc: Rik van Riel <[email protected]> > Cc: Mel Gorman <[email protected]> > Cc: Andrew Morton <[email protected]> > Signed-off-by: Shaohua Li <[email protected]>
Acked-by: Johannes Weiner <[email protected]> FWIW, I agree with Minchan that this could be folded into the previous patch and would be a little neater. But I don't feel strongly in this case since I didn't have any trouble reviewing the patches like this - void mark_page_lazyfree(struct page *) is an easy API to remember.
