linux-kernel - Re: [PATCH v2] ARM: mm: Do not invoke OOM for higher order IOMMU DMA allocations

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Date:	Mon, 23 Mar 2015 16:07:49 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Tomasz Figa <tfiga@...omium.org>
cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Will Deacon <will.deacon@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Ritesh Harjani <ritesh.harjani@...il.com>,
	Carlo Caione <carlo@...one.org>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Douglas Anderson <dianders@...omium.org>,
	Sonny Rao <sonnyrao@...omium.org>
Subject: Re: [PATCH v2] ARM: mm: Do not invoke OOM for higher order IOMMU
 DMA allocations

On Mon, 23 Mar 2015, Tomasz Figa wrote:

> IOMMU should be able to use single pages as well as bigger blocks, so if
> higher order allocations fail, we should not affect state of the system,
> with events such as OOM killer, but rather fall back to order 0
> allocations.
> 
> This patch changes the behavior of ARM IOMMU DMA allocator to use
> __GFP_NORETRY, which bypasses OOM invocation, for orders higher than
> zero and, only if that fails, fall back to normal order 0 allocation
> which might invoke OOM killer.
> 
> Signed-off-by: Tomasz Figa <tfiga@...omium.org>

Acked-by: David Rientjes <rientjes@...gle.com>
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