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| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2011-07-26 04:12:09 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 07:57:08 +0400 |
| commit | 6c6d5280431544e4036886ea74e3334a98bc5f96 (patch) | |
| tree | 1362944d254ff1dfa609d84a1e4182a77ce3ca07 /mm/truncate.c | |
| parent | 4b6ddbf7ed4ef2f40e0a27418146eedaa68953c6 (diff) | |
| download | linux-6c6d5280431544e4036886ea74e3334a98bc5f96.tar.xz | |
pagewalk: don't look up vma if walk->hugetlb_entry is unused
Currently, walk_page_range() calls find_vma() every page table for walk
iteration. but it's completely unnecessary if walk->hugetlb_entry is
unused. And we don't have to assume find_vma() is a lightweight
operation. So this patch checks the walk->hugetlb_entry and avoids the
find_vma() call if possible.
This patch also makes some cleanups. 1) remove ugly uninitialized_var()
and 2) #ifdef in function body.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Hiroyuki Kamezawa <kamezawa.hiroyuki@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/truncate.c')
0 files changed, 0 insertions, 0 deletions