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    SubjectRe: [PATCH 00/11] V4: rwsem changes + down_read_critical() proposal
    On Wed, May 26, 2010 at 10:23:59AM +0900, KAMEZAWA Hiroyuki wrote:
    > On Tue, 25 May 2010 11:27:55 +0200
    > Peter Zijlstra <peterz@infradead.org> wrote:
    > > Also, do you really think doing something like:
    > >
    > > /*
    > > * Check the vma index is within the range and do
    > > * sequential scan until m_index.
    > > */
    > > vma = NULL;
    > > if ((unsigned long)l < mm->map_count) {
    > > vma = mm->mmap;
    > > while (l-- && vma)
    > > vma = vma->vm_next;
    > > goto out;
    > > }
    > >
    > > with preemption disabled is a _good_ thing?
    > >
    > > People were talking about raising our vma limit of 64k...

    All right, this is clearly a problem then.

    > Hmm..can't we use something speculative lookup for reading maps ?
    > (as we played in several months ago...)

    Would you happen to have a link to that conversation / remember the
    subject line of the thread ?

    Thanks,

    --
    Michel "Walken" Lespinasse
    A program is never fully debugged until the last user dies.


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