netdev - RE: [PATCH v2 05/10] iommufd: Use GFP_KERNEL_ACCOUNT for iommu

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Message-ID: <BN9PR11MB5276B57F724238DB11EFB42C8CC49@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 19 Jan 2023 03:48:50 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Robin Murphy <robin.murphy@....com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        "ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
        "ath11k@...ts.infradead.org" <ath11k@...ts.infradead.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: RE: [PATCH v2 05/10] iommufd: Use GFP_KERNEL_ACCOUNT for iommu_map()

> From: Jason Gunthorpe <jgg@...dia.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@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>