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    SubjectRe: [PATCH] Document huge memory/cache overhead of memory controller in Kconfig
    KAMEZAWA Hiroyuki wrote:
    > On Thu, 21 Feb 2008 16:33:33 +0530
    > Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
    >
    >>> Another issue is that it will slightly increase TLB/cache
    >>> cost of the memory controller, but I think that would be a fair
    >>> trade off for it being zero cost when disabled but compiled
    >>> in.
    >>>
    >>> Doing it with vmalloc should be easy enough. I can do such
    >>> a patch later unless someone beats me to it...
    >>>
    >> I'll get to it, but I have too many things on my plate at the moment. KAMEZAWA
    >> also wanted to look at it. I looked through some vmalloc() internals yesterday
    >> and I am worried about allocating all the memory on a single node in a NUMA
    >> system and changing VMALLOC_XXXX on every architecture to provide more vmalloc
    >> space. I might be missing something obvious.
    >>
    >
    > I'll post a series of patch to do that later (it's under debug now...)
    > I'm glad if people (including you) look it and give me advices.
    >

    Thank you so much for your help. I'll definitely look at it and review/test them.

    --
    Warm Regards,
    Balbir Singh
    Linux Technology Center
    IBM, ISTL


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