Messages in this thread | | | Date | Mon, 23 Mar 2015 09:30:30 -0700 | Subject | Re: [PATCH v2] ARM: mm: Do not invoke OOM for higher order IOMMU DMA allocations | From | Doug Anderson <> |
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Tomasz,
On Mon, Mar 23, 2015 at 12:27 AM, Tomasz Figa <tfiga@chromium.org> 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@chromium.org> > --- > arch/arm/mm/dma-mapping.c | 27 +++++++++++++++++++++------ > 1 file changed, 21 insertions(+), 6 deletions(-)
FWIW:
Reviewed-by: Doug Anderson <dianders@chromium.org>
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