Re: missing madvise functionality

Rik van Riel
2007-04-05T07:39:29Z

Rik van Riel wrote:

> MADV_DONTNEED, unpatched, 1000 loops
>
> real 0m13.672s
> user 0m1.217s
> sys 0m45.712s
>
>
> MADV_DONTNEED, with patch, 1000 loops
>
> real 0m4.169s
> user 0m2.033s
> sys 0m3.224s

I just noticed something fun with these numbers.

Without the patch, the system (a quad core CPU) is 10% idle.

With the patch, it is 66% idle - presumably I need Nick's
mmap_sem patch.

However, despite being 66% idle, the test still runs over
3 times as fast!

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