linux-kernel - Re: [Linaro-mm-sig] [PATCH 12/15] drivers: add Contiguous Memory Allocator

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Date:	Fri, 27 Jan 2012 11:44:05 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	Daniel Walker <dwalker@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Jonathan Corbet <corbet@....net>, Mel Gorman <mel@....ul.ie>,
	Michal Nazarewicz <mina86@...a86.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Jesse Barker <jesse.barker@...aro.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [Linaro-mm-sig] [PATCH 12/15] drivers: add Contiguous Memory Allocator

Hi Marek,

With v19, I can't seem to allocate big regions anymore (e.g. 101MiB).
In particular, this seems to fail:

On Thu, Jan 26, 2012 at 11:00 AM, Marek Szyprowski
<m.szyprowski@...sung.com> wrote:
> +static int cma_activate_area(unsigned long base_pfn, unsigned long count)
> +{
> +       unsigned long pfn = base_pfn;
> +       unsigned i = count >> pageblock_order;
> +       struct zone *zone;
> +
> +       WARN_ON_ONCE(!pfn_valid(pfn));
> +       zone = page_zone(pfn_to_page(pfn));
> +
> +       do {
> +               unsigned j;
> +               base_pfn = pfn;
> +               for (j = pageblock_nr_pages; j; --j, pfn++) {
> +                       WARN_ON_ONCE(!pfn_valid(pfn));
> +                       if (page_zone(pfn_to_page(pfn)) != zone)
> +                               return -EINVAL;

The above WARN_ON_ONCE is triggered, and then the conditional is
asserted (page_zone() retuns a "Movable" zone, whereas zone is
"Normal") and the function fails.

This happens to me on OMAP4 with your 3.3-rc1-cma-v19 branch (and a
bunch of remoteproc/rpmsg patches).

Do big allocations work for you ?

Thanks,
Ohad.
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