• C
    [PATCH] page migration: Support a vma migration function · 7b2259b3
    Christoph Lameter 提交于
    Hooks for calling vma specific migration functions
    
    With this patch a vma may define a vma->vm_ops->migrate function.  That
    function may perform page migration on its own (some vmas may not contain page
    structs and therefore cannot be handled by regular page migration.  Pages in a
    vma may require special preparatory treatment before migration is possible
    etc) .  Only mmap_sem is held when the migration function is called.  The
    migrate() function gets passed two sets of nodemasks describing the source and
    the target of the migration.  The flags parameter either contains
    
    MPOL_MF_MOVE	which means that only pages used exclusively by
    		the specified mm should be moved
    
    or
    
    MPOL_MF_MOVE_ALL which means that pages shared with other processes
    		should also be moved.
    
    The migration function returns 0 on success or an error condition.  An error
    condition will prevent regular page migration from occurring.
    
    On its own this patch cannot be included since there are no users for this
    functionality.  But it seems that the uncached allocator will need this
    functionality at some point.
    Signed-off-by: NChristoph Lameter <clameter@sgi.com>
    Cc: Hugh Dickins <hugh@veritas.com>
    Cc: Andi Kleen <ak@muc.de>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    7b2259b3
migrate.c 21.3 KB