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    SubjectRe: [PATCH V3 0/8] Cleancache: overview
    On 07/24/2010 12:17 AM, Dan Magenheimer wrote:
    >>> On Fri, Jul 23, 2010 at 06:58:03AM -0700, Dan Magenheimer wrote:
    >>>> CHRISTOPH AND ANDREW, if you disagree and your concerns have
    >>>> not been resolved, please speak up.
    >> Hi Christoph --
    >> Thanks very much for the quick (instantaneous?) reply!
    >>> Anything that need modification of a normal non-shared fs is utterly
    >>> broken and you'll get a clear NAK, so the propsal before is a good
    >>> one.
    >> No, the per-fs opt-in is very sensible; and its design is
    >> very minimal.
    > Not to belabor the point, but maybe the right way to think about
    > this is:
    > Cleancache is a new optional feature provided by the VFS layer
    > that potentially dramatically increases page cache effectiveness
    > for many workloads in many environments at a negligible cost.
    > Filesystems that are well-behaved and conform to certain restrictions
    > can utilize cleancache simply by making a call to cleancache_init_fs
    > at mount time. Unusual, misbehaving, or poorly layered filesystems
    > must either add additional hooks and/or undergo extensive additional
    > testing... or should just not enable the optional cleancache.

    OK, So I maintain a filesystem in Kernel. How do I know if my FS
    is not "Unusual, misbehaving, or poorly layered"


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