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    SubjectRe: [PATCH][RFC] splice support
    On Thu, Mar 30 2006, KAMEZAWA Hiroyuki wrote:
    > On Thu, 30 Mar 2006 15:53:46 +0200
    > Jens Axboe <axboe@suse.de> wrote:
    >
    > > > I don't know about sendfile() but this looks client can hold server's
    > > > memory, when server uses sendfile() 64k/conn.
    > >
    > > You mean when the server uses splice, 64kb (well 16 pages actually) /
    > > connection? That's a correct observation, I wouldn't think that pinning
    > > that small a number of pages is likely to cause any issues. At least I
    > > can think of much worse pinning by just doing IO :-)
    > >
    > My point is consumer can sleep forever and pages are pinnded forever.
    > And people who use splice() will not notice they are pinning pages.
    >
    > But as you say, it's not problem in usual situation.
    > Maybe I'm too pessimistic how my cusomers play with Linux ;)

    It's a valid concern, however as mentioned there's a number of ways in
    which a user can pin memory already. Perhaps this general problem should
    be capped elsewhere?

    --
    Jens Axboe

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