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    mm: reuse_swap_page replaces can_share_swap_page · 7b1fe597
    Hugh Dickins 提交于
    A good place to free up old swap is where do_wp_page(), or do_swap_page(),
    is about to redirty the page: the data on disk is then stale and won't be
    read again; and if we do decide to write the page out later, using the
    previous swap location makes an unnecessary disk seek very likely.
    
    So give can_share_swap_page() the side-effect of delete_from_swap_cache()
    when it safely can.  And can_share_swap_page() was always a misleading
    name, the more so if it has a side-effect: rename it reuse_swap_page().
    
    Irrelevant cleanup nearby: remove swap_token_default_timeout definition
    from swap.h: it's used nowhere.
    Signed-off-by: NHugh Dickins <hugh@veritas.com>
    Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
    Acked-by: NRik van Riel <riel@redhat.com>
    Cc: Nick Piggin <nickpiggin@yahoo.com.au>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Robin Holt <holt@sgi.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    7b1fe597
swapfile.c 46.3 KB