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Subject[PATCH 0/8] mm, hugetlb: fixes and fault scalability
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This patchset resumes the work to improve the whole hugepage fault
scalability path. Previous efforts can be found here:

https://lkml.org/lkml/2013/7/26/299
https://lkml.org/lkml/2013/12/18/50

The latest attempt to address the big-fat hugetlb instantiation mutex by
removing the need for it altogether ended up having too much of an overhead
to consider and allow scalability. The discussion can be found at:
https://lkml.org/lkml/2014/1/3/244

This patchset is divided in three parts, where the first seven patches,
from Joonsoo, have been included and reviewed in previous patchsets. The
last patch is the actual performance one.

Part 1. (1-3) Introduce new protection method for region tracking
data structure, instead of the hugetlb_instantiation_mutex. There
is race condition when we map the hugetlbfs file to two different
processes. To prevent it, we need to new protection method like
as this patchset.

Part 2. (4-7) clean-up.

These make code really simple, so these are worth to go into
mainline separately.

Part 4 (8) Use a table of mutexes instead of a unique one, and allow
faults to be handled in parallel. Benefits and caveats to this
approach are in the patch.

All changes have passed the libhugetblfs test cases.
This patchset applies on top of Linus' current tree (3.13-77d143de)

Thanks!

mm, hugetlb: unify region structure handling
mm, hugetlb: region manipulation functions take resv_map rather
list_head
mm, hugetlb: fix race in region tracking
mm, hugetlb: remove resv_map_put
mm, hugetlb: use vma_resv_map() map types
mm, hugetlb: remove vma_has_reserves
mm, hugetlb: mm, hugetlb: unify chg and avoid_reserve to use_reserve
mm, hugetlb: improve page-fault scalability

fs/hugetlbfs/inode.c | 17 ++-
include/linux/hugetlb.h | 10 ++
mm/hugetlb.c | 323 +++++++++++++++++++++++++++---------------------
3 files changed, 206 insertions(+), 144 deletions(-)

--
1.8.1.4



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