[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH 08/36] xen/arm: add colored flag to page struct
Hi, On 04/03/2022 17:46, Marco Solieri wrote: From: Luca Miccio <lucmiccio@xxxxxxxxx> A new allocator enforcing a cache-coloring configuration is going to be introduced. We thus need to distinguish the memory pages assigned to, and managed by, such colored allocator from the ordinary buddy allocator's ones. Add a color flag to the page structure. Signed-off-by: Luca Miccio <lucmiccio@xxxxxxxxx> Signed-off-by: Marco Solieri <marco.solieri@xxxxxxxxxxxxxxx> --- xen/arch/arm/include/asm/mm.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h index 487be7cf59..9ac1767595 100644 --- a/xen/arch/arm/include/asm/mm.h +++ b/xen/arch/arm/include/asm/mm.h @@ -88,6 +88,10 @@ struct page_info */ u32 tlbflush_timestamp; }; + + /* Is page managed by the cache-colored allocator? */ + bool colored; struct page_info is going to be used quite a lot. In fact, there is one per RAM page. So we need to avoid growing the structure. For Arm64, there is a 4 bytes padding here. But for arm32, there are none. So the size will increase by another 8 bytes. In this case, I would use a bit in count_info. Cheers, -- Julien Grall
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