Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: Memory management woes - order 1 allocation failures | Date | Wed, 3 Mar 2010 08:31:01 +0900 (JST) |
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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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