Re: [PATCH -mm] make swapin readahead skip over holes

[Christoph Lameter]

On Wed, 11 Jan 2012, John Stoffel wrote:

> KOSAKI> so, we can eat free lunch up to 7MB ~= 60(MB/sec) * 1000 / 8.5(ms).
>
> What if the disk is busy doing other writeout or readin during this
> time?  You can't assume you have the full disk bandwidth available,
> esp when you hit a swap storm like this.

The assumptions by Kosaki are quite conservative.

What if one did not get a disk from the garbage heap but instead has a
state of the art storage cluster or simply an SSD (in particular relevant
now since HDs are in short supply given the situation in Asia)?

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