RE: [PATCH v2 05/10] iommufd: Use GFP_KERNEL_ACCOUNT for iommu_map()
From: "Tian, Kevin" <kevin.tian@intel.com>
Date: 2023-01-20 04:33:18
Also in:
ath11k, dri-devel, kvm, linux-arm-kernel, linux-arm-msm, linux-iommu, linux-media, linux-rdma, linux-remoteproc, linux-s390, linux-tegra, linux-wireless, nouveau, virtualization
From: Jason Gunthorpe <jgg@nvidia.com> Sent: Thursday, January 19, 2023 2:01 AM iommufd follows the same design as KVM and uses memory cgroups to limit the amount of kernel memory a iommufd file descriptor can pin down. The various internal data structures already use GFP_KERNEL_ACCOUNT. However, one of the biggest consumers of kernel memory is the IOPTEs stored under the iommu_domain. Many drivers will allocate these at iommu_map() time and will trivially do the right thing if we pass in GFP_KERNEL_ACCOUNT. Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>