| Message ID | 5-v2-ce66f632bd0d+484-iommu_map_gfp_jgg@nvidia.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Johannes Berg |
| Headers | show |
| Series | Let iommufd charge IOPTE allocations to the memory cgroup | expand |
> 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>
diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c index 22cc3bb0c6c55a..f8d92c9bb65b60 100644 --- a/drivers/iommu/iommufd/pages.c +++ b/drivers/iommu/iommufd/pages.c @@ -457,7 +457,7 @@ static int batch_iommu_map_small(struct iommu_domain *domain, while (size) { rc = iommu_map(domain, iova, paddr, PAGE_SIZE, prot, - GFP_KERNEL); + GFP_KERNEL_ACCOUNT); if (rc) goto err_unmap; iova += PAGE_SIZE; @@ -502,7 +502,7 @@ static int batch_to_domain(struct pfn_batch *batch, struct iommu_domain *domain, rc = iommu_map(domain, iova, PFN_PHYS(batch->pfns[cur]) + page_offset, next_iova - iova, area->iommu_prot, - GFP_KERNEL); + GFP_KERNEL_ACCOUNT); if (rc) goto err_unmap; iova = next_iova;
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> --- drivers/iommu/iommufd/pages.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)