On Wed, May 01, 2013 at 04:14:16PM +0800, Ric Mason wrote: > On 05/01/2013 04:06 PM, Mel Gorman wrote: > >On Wed, May 01, 2013 at 01:41:34PM +0800, Sam Ben wrote: > >>Hi Mel, > >>On 04/30/2013 12:31 AM, Mel Gorman wrote: > >>>If a page is on a pagevec then it is !PageLRU and mark_page_accessed() > >>>may fail to move a page to the active list as expected. Now that the > >>>LRU is selected at LRU drain time, mark pages PageActive if they are > >>>on a pagevec so it gets moved to the correct list at LRU drain time. > >>>Using a debugging patch it was found that for a simple git checkout > >>>based workload that pages were never added to the active file list in > >>Could you show us the details of your workload? > >> > >The workload is git checkouts of a fixed number of commits for the > > Is there script which you used? > mmtests with config-global-dhp__io-gitcheckout-randread-starvation . Parallel randread was to see if the random file read would push the metadata blocks out or not. I expected it would not be enough to trigger the reported problem but it would be enough to determine if file pages were getting added to the active lists or not. > >kernel git tree. It starts with a warm-up run that is not timed and then > >records the time for a number of iterations. > > How to record the time for a number of iterations? Is the iteration > here means lru scan? > /usr/bin/time -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>