On Friday August 10, [EMAIL PROTECTED] wrote: > On 8/1/07, Neil Brown <[EMAIL PROTECTED]> wrote: > > > No, this does not use indefinite stack. > > > > loop will schedule each request to be handled by a kernel thread, so > > requests to 'loop' are serialised, never stacked. > > > > In 2.6.22, generic_make_request detects and serialises recursive calls, > > so unlimited recursion is not possible there either. > > Is that saying "before 2.6.22, a read/write on a deeply layered device > would use a lot of stack?"
before 2.6.22, a stack of dm and/or md devices (not loop, and not md/raid0 or md/linear) would use more stack the more devices were involved. If you made a very deep stack, you could push the stack over any limit you chose. I won't say "a lot of stack" as I haven't measured the exact amount, just "more stack as you add more devices". NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
