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authorHugh Dickins <hugh@veritas.com>2005-10-29 18:16:00 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-29 21:40:37 -0700
commit7be7a546994f1222b2312fd348da14e16b6b7b42 (patch)
treee1f8dae8783274372a0f136be6eb64102877e9f6 /include/asm-generic
parent65500d234e74fc4e8f18e1a429bc24e51e75de4a (diff)
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[PATCH] mm: move_page_tables by extents
Speeding up mremap's moving of ptes has never been a priority, but the locking will get more complicated shortly, and is already too baroque. Scrap the current one-by-one moving, do an extent at a time: curtailed by end of src and dst pmds (have to use PMD_SIZE: the way pmd_addr_end gets elided doesn't match this usage), and by latency considerations. One nice property of the old method is lost: it never allocated a page table unless absolutely necessary, so you could free empty page tables by mremapping to and fro. Whereas this way, it allocates a dst table wherever there was a src table. I keep diving in to reinstate the old behaviour, then come out preferring not to clutter how it now is. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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