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    SubjectRe: Memory management woes - order 1 allocation failures
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    > > For reasons that are not particularly clear to me, tty_buffer_alloc() is
    > > called far more frequently in 2.6.33 than in 2.6.24. I instrumented the
    > > function to print out the size of the buffers allocated, booted under
    > > qemu and would just "cat /bin/ls" to see what buffers were allocated.
    > > 2.6.33 allocates loads, including high-order allocations. 2.6.24
    > > appeared to allocate once and keep silent.
    >
    > The pty layer is using them now and didn't before. That will massively
    > distort your numhers.
    >
    > > While there have been snags recently with respect to high-order
    > > allocation failures in recent kernels, this might be one of the cases
    > > where it's due to subsystems requesting high-order allocations more.
    >
    > The pty code certainly triggered more such allocations. I've sent Greg
    > patches to make the tty buffering layer allocate sensible sizes as it
    > doesn't need multiple page allocations in the first place.

    Wow, great! :)




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