• Rik van Riel's avatar
    vmscan: evict use-once pages first · 56e49d21
    Rik van Riel authored
    When the file LRU lists are dominated by streaming IO pages, evict those
    pages first, before considering evicting other pages.
    
    This should be safe from deadlocks or performance problems
    because only three things can happen to an inactive file page:
    
    1) referenced twice and promoted to the active list
    2) evicted by the pageout code
    3) under IO, after which it will get evicted or promoted
    
    The pages freed in this way can either be reused for streaming IO, or
    allocated for something else.  If the pages are used for streaming IO,
    this pageout pattern continues.  Otherwise, we will fall back to the
    normal pageout pattern.
    Signed-off-by: default avatarRik van Riel <riel@redhat.com>
    Reported-by: default avatarElladan <elladan@eskimo.com>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
    Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    56e49d21
memcontrol.c 61.4 KB