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    SubjectRe: [PATCHv6 00/22] Transparent huge page cache: phase 1, everything but mmap()
    On Tue, Sep 24, 2013 at 04:37:40PM -0700, Andrew Morton wrote:
    > On Mon, 23 Sep 2013 15:05:28 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
    >
    > > It brings thp support for ramfs, but without mmap() -- it will be posted
    > > separately.
    >
    > We were never going to do this :(
    >
    > Has anyone reviewed these patches much yet?
    >

    I am afraid I never looked too closely once I learned that the primary
    motivation for this was relieving iTLB pressure in a very specific
    case. AFAIK, this is not a problem in the vast majority of modern CPUs
    and I found it very hard to be motivated to review the series as a result.
    I suspected that in many cases that the cost of IO would continue to dominate
    performance instead of TLB pressure. I also found it unlikely that there
    was a workload that was tmpfs based that used enough memory to be hurt
    by TLB pressure. My feedback was that a much more compelling case for the
    series was needed but this discussion all happened on IRC unfortunately.

    --
    Mel Gorman
    SUSE Labs


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