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| author | Michel Lespinasse <walken@google.com> | 2013-02-22 16:35:56 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:23 -0800 |
| commit | 240aadeedc4a89fc44623f8ce4ca46bda73db07e (patch) | |
| tree | e12cc254f2e78560837e5d454fdbe9b5d9e05c5c /mm/nommu.c | |
| parent | 28a35716d317980ae9bc2ff2f84c33a3cda9e884 (diff) | |
| download | linux-240aadeedc4a89fc44623f8ce4ca46bda73db07e.tar.gz linux-240aadeedc4a89fc44623f8ce4ca46bda73db07e.tar.bz2 linux-240aadeedc4a89fc44623f8ce4ca46bda73db07e.zip | |
mm: accelerate mm_populate() treatment of THP pages
This change adds a follow_page_mask function which is equivalent to
follow_page, but with an extra page_mask argument.
follow_page_mask sets *page_mask to HPAGE_PMD_NR - 1 when it encounters
a THP page, and to 0 in other cases.
__get_user_pages() makes use of this in order to accelerate populating
THP ranges - that is, when both the pages and vmas arrays are NULL, we
don't need to iterate HPAGE_PMD_NR times to cover a single THP page (and
we also avoid taking mm->page_table_lock that many times).
Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 6ab706608492..da0d210fd403 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1819,9 +1819,11 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, return ret; } -struct page *follow_page(struct vm_area_struct *vma, unsigned long address, - unsigned int foll_flags) +struct page *follow_page_mask(struct vm_area_struct *vma, + unsigned long address, unsigned int flags, + unsigned int *page_mask) { + *page_mask = 0; return NULL; } |