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| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2012-12-12 13:50:54 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 17:38:31 -0800 |
| commit | 93b4796dede916de74b21fbd637588da6a99a7ec (patch) | |
| tree | 3833de6051bb1b8d361a614743aafa56b43902e1 /lib/spinlock_debug.c | |
| parent | thp: copy_huge_pmd(): copy huge zero page (diff) | |
| download | linux-dev-93b4796dede916de74b21fbd637588da6a99a7ec.tar.xz linux-dev-93b4796dede916de74b21fbd637588da6a99a7ec.zip | |
thp: do_huge_pmd_wp_page(): handle huge zero page
On write access to huge zero page we alloc a new huge page and clear it.
If ENOMEM, graceful fallback: we create a new pmd table and set pte around
fault address to newly allocated normal (4k) page. All other ptes in the
pmd set to normal zero page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/spinlock_debug.c')
0 files changed, 0 insertions, 0 deletions