• Rik van Riel's avatar
    vmscan: split LRU lists into anon & file sets · 4f98a2fe
    Rik van Riel authored
    Split the LRU lists in two, one set for pages that are backed by real file
    systems ("file") and one for pages that are backed by memory and swap
    ("anon").  The latter includes tmpfs.
    The advantage of doing this is that the VM will not have to scan over lots
    of anonymous pages (which we generally do not want to swap out), just to
    find the page cache pages that it should evict.
    This patch has the infrastructure and a basic policy to balance how much
    we scan the anon lists and how much we scan the file lists.  The big
    policy changes are in separate patches.
    [lee.schermerhorn@hp.com: collect lru meminfo statistics from correct offset]
    [kosaki.motohiro@jp.fujitsu.com: prevent incorrect oom under split_lru]
    [kosaki.motohiro@jp.fujitsu.com: fix pagevec_move_tail() doesn't treat unevictable page]
    [hugh@veritas.com: memcg swapbacked pages active]
    [hugh@veritas.com: splitlru: BDI_CAP_SWAP_BACKED]
    [akpm@linux-foundation.org: fix /proc/vmstat units]
    [nishimura@mxp.nes.nec.co.jp: memcg: fix handling of shmem migration]
    [kosaki.motohiro@jp.fujitsu.com: adjust Quicklists field of /proc/meminfo]
    [kosaki.motohiro@jp.fujitsu.com: fix style issue of get_scan_ratio()]
    Signed-off-by: default avatarRik van Riel <riel@redhat.com>
    Signed-off-by: default avatarLee Schermerhorn <Lee.Schermerhorn@hp.com>
    Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
    Signed-off-by: default avatarDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>