Re: how to purposfully fragment memory?

[Dan Kruchinin]

On 3/20/07, Chris Friesen <cfriesen@xxxxxxxxxx> wrote:
> Asgard wrote:
>
> > btw, can you describe your aim in details?
>
> I'm doing some work on a network device driver.  We were having jumbo
> frame issues after being up for a month or so because it couldn't
> allocate enough contiguous memory.
>
> We've got a new code path now that doesn't need large contiguous
> allocations, so I'd like to demonstrate it by forcing the system to
> become severely fragmented.
>
> Chris

and by the way, you can try to use void split_page(struct page *page,
unsigned int order) function, but keep in mind, that it's not
recommended to use it in drivers:
/*
* split_page takes a non-compound higher-order page, and splits it into
* n (1<<order) sub-pages: page[0..n]
* Each sub-page must be freed individually.
*
* Note: this is probably too low level an operation for use in drivers.
* Please consult with lkml before using this in your driver.
*/
void split_page(struct page *page, unsigned int order)

Good luck.
Dan.
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