0b20035778
the reason why we add a vendor hook adjusting alloc_flags: 1 the user only pass parameter size and gfp_flags once. if we mask the __GFP_RECLAIM, we can't distinguish high-order and low-order, they all will not rise reclaim behavior, it's wrong. 2 for __iommu_dma_alloc_pages, there is a loop to try to alloc pages from high-order to low-order fallback, and we add hook callsite to only change the high-order( > costly order) alloc behavior(which high probability will result more overhead than benifit). which allow low order alloc to do reclaim behavior still, otherwise may end up with alloc fail. 3 in android ION(drivers/dma-buf/heaps/system_heap.c ) there is same logic, high-order alloc will not do reclaim behavior. so this change and a vendor hook for adjusting alloc_flags, and add a callsite in __iommu_dma_alloc_pages to turn the reclaim behavior. Bug: 300857012 Change-Id: I30bd634d8ede1cc29c83d52bdd9276c8cf72ac1e Signed-off-by: lvwenhuan <lvwenhuan@oppo.com> (cherry picked from commit d6c24c3a63567676de818011403abe5b9b3d38b0) |
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