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authorHugh Dickins <hugh.dickins@tiscali.co.uk>2009-12-14 17:59:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:18 -0800
commit31e855ea7173bdb0520f9684580423a9560f66e0 (patch)
tree20ff327e2a58929696946971a8201da559785338 /firmware/.gitignore
parent93d17715a5b960d34220f2edba3e6cee9b5b1c58 (diff)
ksm: remove redundancies when merging page
There is no need for replace_page() to calculate a write-protected prot vm_page_prot must already be write-protected for an anonymous page (see mm/memory.c do_anonymous_page() for similar reliance on vm_page_prot). There is no need for try_to_merge_one_page() to get_page and put_page on newpage and oldpage: in every case we already hold a reference to each of them. But some instinct makes me move try_to_merge_one_page()'s unlock_page of oldpage down after replace_page(): that doesn't increase contention on the ksm page, and makes thinking about the transition easier. Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Izik Eidus <ieidus@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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