Re: [RFC] Changing COW detection to be memory hotplug friendly

[Andrew Morton]

Andrea Arcangeli <andrea@xxxxxxx> wrote:
>
> you're right something might be different now
>  that we don't follow a swapout virtual address space order anymore

There's a patch in -mm which attempts to do so, and afair, succeeds.

However the performance seems to be crappy.  Its main benefit at present
is in reducing worst-case scheduling latencies (scan_swap_map).

ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.11-rc3/2.6.11-rc3-mm2/broken-out/swapspace-layout-improvements-fix.patch
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