On Thu, 15 Nov 2012, Andrew Morton wrote: > From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Subject: revert "mm: fix-up zone present pages" > > Revert > > commit 7f1290f2f2a4d2c3f1b7ce8e87256e052ca23125 > Author: Jianguo Wu <wujianguo@xxxxxxxxxx> > AuthorDate: Mon Oct 8 16:33:06 2012 -0700 > Commit: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > CommitDate: Tue Oct 9 16:22:54 2012 +0900 > > mm: fix-up zone present pages > > > That patch tried to fix a issue when calculating zone->present_pages, but > it caused a regression on 32bit systems with HIGHMEM. With that > changeset, reset_zone_present_pages() resets all zone->present_pages to > zero, and fixup_zone_present_pages() is called to recalculate > zone->present_pages when the boot allocator frees core memory pages into > buddy allocator. Because highmem pages are not freed by bootmem > allocator, all highmem zones' present_pages becomes zero. > > Various options for improving the situation are being discussed but for > now, let's return to the 3.6 code. > > Cc: Jianguo Wu <wujianguo@xxxxxxxxxx> > Cc: Jiang Liu <jiang.liu@xxxxxxxxxx> > Cc: Petr Tesarik <ptesarik@xxxxxxx> > Cc: "Luck, Tony" <tony.luck@xxxxxxxxx> > Cc: Mel Gorman <mel@xxxxxxxxx> > Cc: Yinghai Lu <yinghai@xxxxxxxxxx> > Cc: Minchan Kim <minchan.kim@xxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: David Rientjes <rientjes@xxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> -- 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>