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    SubjectRe: [PATCH 1/3] mm: completely disable THP by transparent_hugepage=never
    于 2011年06月21日 01:10, Rik van Riel 写道:
    > On 06/20/2011 01:07 PM, Cong Wang wrote:
    >> 于 2011年06月21日 00:58, Mel Gorman 写道:
    >>> On Tue, Jun 21, 2011 at 12:34:28AM +0800, Amerigo Wang wrote:
    >>>> transparent_hugepage=never should mean to disable THP completely,
    >>>> otherwise we don't have a way to disable THP completely.
    >>>> The design is broken.
    >>>>
    >>>
    >>> I don't get why it's broken. Why would the user be prevented from
    >>> enabling it at runtime?
    >>>
    >>
    >> We need to a way to totally disable it, right? Otherwise, when I configure
    >> THP in .config, I always have THP initialized even when I pass "=never".
    >>
    >> For me, if you don't provide such way to disable it, it is not flexible.
    >>
    >> I meet this problem when I try to disable THP in kdump kernel, there is
    >> no user of THP in kdump kernel, THP is a waste for kdump kernel. This is
    >> why I need to find a way to totally disable it.
    >
    > What you have not explained yet is why having THP
    > halfway initialized (but not used, and without a
    > khugepaged thread) is a problem at all.
    >
    > Why is it a problem for you?

    It occupies some memory, memory is valuable in kdump kernel (usually
    only 128M). :) Since I am sure no one will use it, why do I still need
    to initialize it at all?

    Thanks.
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