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    SubjectRe: Tmem [PATCH 0/5] (Take 3): Transcendent memory
    Hi!

    > > achive this using
    > > > > some existing infrastructure in kernel.
    > > >
    > > > Hi Nitin --
    > > >
    > > > Sorry if I sounded overly negative... too busy around the holidays.
    > > >
    > > > I'm definitely OK with exploring alternatives. I just think that
    > > > existing kernel mechanisms are very firmly rooted in the notion
    > > > that either the kernel owns the memory/cache or an asynchronous
    > > > device owns it. Tmem falls somewhere in between and is very
    > >
    > > Well... compcache seems to be very similar to preswap: in preswap case
    > > you don't know if hypervisor will have space, in ramzswap you don't
    > > know if data are compressible.
    >
    > Hi Pavel --
    >
    > Yes there are definitely similarities too. In fact, I started
    > prototyping preswap (now called frontswap) with Nitin's
    > compcache code. IIRC I ran into some problems with compcache's
    > difficulties in dealing with failed "puts" due to dynamic
    > changes in size of hypervisor-available-memory.
    >
    > Nitin may have addressed this in later versions of ramzswap.

    That would be cool to find out.

    > One feature of frontswap which is different than ramzswap is
    > that frontswap acts as a "fronting store" for all configured
    > swap devices, including SAN/NAS swap devices. It doesn't
    > need to be separately configured as a "highest priority" swap
    > device. In many installations and depending on how ramzswap

    Ok, I'd call it a bug, not a feature :-).
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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