Benjamin LaHaise wrote:
Hello Andrew et al,
The patch below adds a fast path that avoids the atomic dec and test
operation and spinlock acquire/release on page free. This is especially
important to the network stack which uses put_page() to free user
buffers. Removing these atomic ops helps improve netperf on the P4
from ~8126Mbit/s to ~8199Mbit/s (although that number fluctuates quite a
bit with some runs getting 8243Mbit/s). There are probably better
workloads to see an improvement from this on, but removing 3 atomics and
an irq save/restore is good.
-ben
You can't do this because you can't test PageLRU like that.
Have a look in the lkml archives a few months back, where I proposed
a way to do this for __free_pages(). You can't do it for put_page.
BTW I have quite a large backlog of patches in -mm which should end
up avoiding an atomic or two around these parts.
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