Re: [PATCH 09/16] iommu/iommufd: use page allocation function provided by iommu-pages.h
From: Pasha Tatashin <pasha.tatashin@soleen.com>
Date: 2023-11-29 22:00:21
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asahi, cgroups, kvm, linux-doc, linux-fsdevel, linux-iommu, linux-mm, linux-rockchip, linux-samsung-soc, linux-sunxi, linux-tegra, lkml, virtualization
On Tue, Nov 28, 2023 at 6:52 PM Jason Gunthorpe [off-list ref] wrote:
On Tue, Nov 28, 2023 at 08:49:31PM +0000, Pasha Tatashin wrote:quoted
Convert iommu/iommufd/* files to use the new page allocation functions provided in iommu-pages.h. Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com> --- drivers/iommu/iommufd/iova_bitmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)This is a short term allocation, it should not be counted, that is why it is already not using GFP_KERNEL_ACCOUNT.
I made this change for completeness. I changed all calls to get_free_page/alloc_page etc under driver/iommu to use the iommu_alloc_* variants, this also helps future developers in this area to use the right allocation functions. The accounting is implemented using cheap per-cpu counters, so should not affect the performance, I think it is OK to keep them here.