On Wed, 14 Dec 2011 15:41:22 +0000 Mel Gorman <mgorman@xxxxxxx> wrote: > Short summary: There are severe stalls when a USB stick using VFAT > is used with THP enabled that are reduced by this series. If you are > experiencing this problem, please test and report back and considering > I have seen complaints from openSUSE and Fedora users on this as well > as a few private mails, I'm guessing it's a widespread issue. This > is a new type of USB-related stall because it is due to synchronous > compaction writing where as in the past the big problem was dirty > pages reaching the end of the LRU and being written by reclaim. Overall footprint: fs/btrfs/disk-io.c | 5 fs/hugetlbfs/inode.c | 3 fs/nfs/internal.h | 2 fs/nfs/write.c | 4 include/linux/fs.h | 11 +- include/linux/migrate.h | 23 +++- include/linux/mmzone.h | 4 include/linux/vm_event_item.h | 1 mm/compaction.c | 5 mm/memory-failure.c | 2 mm/memory_hotplug.c | 2 mm/mempolicy.c | 2 mm/migrate.c | 171 +++++++++++++++++++++----------- mm/page_alloc.c | 50 +++++++-- mm/swap.c | 74 ++++++++++++- mm/vmscan.c | 114 ++++++++++++++++++--- mm/vmstat.c | 2 17 files changed, 371 insertions(+), 104 deletions(-) The line count belies the increase in complexity. Sigh, this whole hugetlb page thing is just killing us. -- 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>