Nick Piggin writes:
> Nick Piggin wrote:
> > Linus Torvalds wrote:
> >
> >>
> >> Why do you think the IO layer should get larger requests?
> >
> >
> > For workloads where plugging helps (ie. lots of smaller, contiguous
> > requests going into the IO layer), should be pretty good these days
> > due to multiple readahead and writeback.
>
> Let me try again.
>
> For workloads where plugging helps (ie. lots of smaller, contiguous
> requests going into the IO layer), the request pattern should be
> pretty good without plugging these days, due to multiple page
> readahead and writeback.
Pageout by VM scanner doesn't benefit from those, and it is still quite
important in some workloads (e.g., mmap intensive).
Nikita.
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