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    SubjectRe: [PATCH 04/14] mm,migration: Allow the migration of PageSwapCache pages
    On 04/24/2010 07:59 AM, Mel Gorman wrote:
    > On Sat, Apr 24, 2010 at 01:13:40PM +0200, Andrea Arcangeli wrote:

    >> Also keep in mind expand_downwards which also adjusts
    >> vm_start/vm_pgoff the same way (and without mmap_sem write mode).
    > Will keep it in mind. It's taking the anon_vma lock but once again,
    > there might be more than one anon_vma to worry about and the proper
    > locking still isn't massively clear to me.

    The locking for the anon_vma_chain->same_vma list is
    essentially the same as what was used before in mmap
    and anon_vma_prepare.

    Either the mmap_sem is held for write, or the mmap_sem
    is held for reading and the page_table_lock is held.

    What exactly is the problem that migration is seeing?

    All rights reversed

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      Last update: 2010-04-26 23:57    [W:0.018 / U:1.824 seconds]
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