On Tue, Nov 15, 2011 at 12:37:23AM +0900, Minchan Kim wrote: > [1] made avoid unnecessary reclaim stall when second shrink_page_list(ie, synchronous > shrink_page_list) try to reclaim page_list which has not-dirty pages. > But it seems rather awkawrd on unevictable page. > The unevictable page in shrink_page_list would be moved into unevictable lru from page_list. > So it would be not on page_list when shrink_page_list returns. > Nevertheless it skips reclaim stall. > > This patch fixes it so that it can do reclaim stall in case of mixing mlocked pages > and writeback pages on page_list. > > [1] 7d3579e,vmscan: narrow the scenarios in whcih lumpy reclaim uses synchrounous reclaim Lumpy isolates physically contiguous in the hope to free a bunch of pages that can be merged to a bigger page. If an unevictable page is encountered, the chance of that is gone. Why invest the allocation latency when we know it won't pay off anymore? -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>