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    SubjectRe: [PATCH][RFC] 4K stacks default, not a debug thing any more...?
    On Wednesday 11 July 2007 10:54, Zan Lynx wrote:
    > Jesper Juhl wrote:
    > > Hi,
    > >
    > > I'm wondering if it's time to make 4K stacks the default and to start
    > > considering removing the 8K stack option alltogether soon?
    > >
    > > One of the big problem spots was XFS, but that got some stack usage
    > > fixes recently, and the 4K stack option has been around for quite a
    > > while now, so people really should have gotten around to fixing any
    > > code that can't handle it. Are there still any big problem areas
    > > remaining?
    > Has anyone fixed the infrequent crashes with 4K stacks and ext3 -> LVM
    > snapshot -> LVM -> DM mirror -> libata?

    Ahem: ext3 -> LVM snapshot -> LVM -> DM mirror -> DM crypt -> md -> libata,
    or worse.

    No, it's not fixed. The model is wrong. Virtual block drivers should not
    be callling submit_bio. The recursive IO submissions should be handled
    on a dedicated stack, most probably allocated as part of the request queue.
    This could be done easily in device mapper and md, or better, in


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