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    SubjectRe: [PATCH] memcg: fix stale swap cache leak v5
    * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2009-04-30 18:04:26]:

    > On Thu, 30 Apr 2009 16:35:39 +0900
    > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
    >
    > > On Thu, 30 Apr 2009 16:16:27 +0900
    > > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
    > >
    > > > This is v5 but all codes are rewritten.
    > > >
    > > > After this patch, when memcg is used,
    > > > 1. page's swapcount is checked after I/O (without locks). If the page is
    > > > stale swap cache, freeing routine will be scheduled.
    > > > 2. vmscan.c calls try_to_free_swap() when __remove_mapping() fails.
    > > >
    > > > Works well for me. no extra resources and no races.
    > > >
    > > > Because my office will be closed until May/7, I'll not be able to make a
    > > > response. Posting this for showing what I think of now.
    > > >
    > > I found a hole immediately after posted this...sorry. plz ignore this patch/
    > > see you again in the next month.
    > >
    > I'm now wondering to disable "swapin readahed" completely when memcg is used...
    > Then, half of the problems will go away immediately.
    > And it's not so bad to try to free swapcache if swap writeback ends. Then, another
    > half will go away...
    >

    Could you clarify? Will memcg not account for swapin readahead pages?


    --
    Balbir


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