Re: Lockless page cache test results

[Andrew Morton]

Jens Axboe <axboe@xxxxxxx> wrote:
>
> Running a splice benchmark on a 4-way IPF box, I decided to give the
>  lockless page cache patches from Nick a spin. I've attached the results
>  as a png, it pretty much speaks for itself.

It does.

What does the test do?

In particular, does it cause the kernel to take tree_lock once per page, or
once per batch-of-pages?
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