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Message-ID: <a8f16e2b0703201434w39108ed0m6d1b50f3b8cd6c42@mail.gmail.com> Date: Wed, 21 Mar 2007 00:34:08 +0300 From: "Dan Kruchinin" <dubalom@...il.com> To: "Chris Friesen" <cfriesen@...tel.com>, linux-kernel@...r.kernel.org Subject: Re: how to purposfully fragment memory? On 3/20/07, Chris Friesen <cfriesen@...tel.com> 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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