(2012/05/14 14:02), Hugh Dickins wrote:

Take lruvec further: pass it instead of zone to add_page_to_lru_list()
and del_page_from_lru_list(); and pagevec_lru_move_fn() pass lruvec
down to its target functions.

This cleanup eliminates a swathe of cruft in memcontrol.c,
including mem_cgroup_lru_add_list(), mem_cgroup_lru_del_list() and
mem_cgroup_lru_move_lists() - which never actually touched the lists.

In their place, mem_cgroup_page_lruvec() to decide the lruvec,
previously a side-effect of add, and mem_cgroup_update_lru_size()
to maintain the lru_size stats.

Whilst these are simplifications in their own right, the goal is to
bring the evaluation of lruvec next to the spin_locking of the lrus,
in preparation for a future patch.

Signed-off-by: Hugh Dickins <hughd@google.com>

Acked-by: KAMEZAWA Hiroyuki <redacted>


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