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SubjectRe: [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v6
On Wed, 14 Dec 2011 15:41:22 +0000
Mel Gorman <mgorman@suse.de> 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.


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