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thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE

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For file mappings, we don't deposit page tables on THP allocation
because it's not strictly required to implement split_huge_pmd(): we can
just clear pmd and let following page faults to reconstruct the page
table.

But Power makes use of deposited page table to address MMU quirk.

Let's hide THP page cache, including huge tmpfs, under separate config
option, so it can be forbidden on Power.

We can revert the patch later once solution for Power found.

Link: http://lkml.kernel.org/r/1466021202-61880-36-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Aneesh Kumar K.V <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2016-07-26 15:26:35 -07:00 • committed by Linus Torvalds
commit e496cf3d78
6 changed files with 41 additions and 21 deletions
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8
mm/Kconfig
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@ -439,6 +439,14 @@ choice
benefit.
endchoice
#
# We don't deposit page tables on file THP mapping,
# but Power makes use of them to address MMU quirk.
#
config TRANSPARENT_HUGE_PAGECACHE
def_bool y
depends on TRANSPARENT_HUGEPAGE && !PPC
#
# UP and nommu archs use km based percpu allocator
#