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From: Jason Gunthorpe <jgg@nvidia.com>
To: Alistair Popple <apopple@nvidia.com>
Cc: linux-mm@kvack.org, cgroups@vger.kernel.org,
	linux-kernel@vger.kernel.org, jhubbard@nvidia.com,
	tjmercier@google.com, hannes@cmpxchg.org, surenb@google.com,
	mkoutny@suse.com, daniel@ffwll.ch, linuxppc-dev@lists.ozlabs.org,
	linux-fpga@vger.kernel.org, linux-rdma@vger.kernel.org,
	virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
	netdev@vger.kernel.org, io-uring@vger.kernel.org,
	bpf@vger.kernel.org, rds-devel@oss.oracle.com,
	linux-kselftest@vger.kernel.org
Subject: Re: [RFC PATCH 01/19] mm: Introduce vm_account
Date: Tue, 24 Jan 2023 10:32:23 -0400	[thread overview]
Message-ID: <Y8/r91PGGiY5JJvE@nvidia.com> (raw)
In-Reply-To: <748338ffe4c42d86669923159fe0426808ecb04d.1674538665.git-series.apopple@nvidia.com>

On Tue, Jan 24, 2023 at 04:42:30PM +1100, Alistair Popple wrote:
> +/**
> + * enum vm_account_flags - Determine how pinned/locked memory is accounted.
> + * @VM_ACCOUNT_TASK: Account pinned memory to mm->pinned_vm.
> + * @VM_ACCOUNT_BYPASS: Don't enforce rlimit on any charges.
> + * @VM_ACCOUNT_USER: Accounnt locked memory to user->locked_vm.
> + *
> + * Determines which statistic pinned/locked memory is accounted
> + * against. All limits will be enforced against RLIMIT_MEMLOCK and the
> + * pins cgroup if CONFIG_CGROUP_PINS is enabled.
> + *
> + * New drivers should use VM_ACCOUNT_TASK. VM_ACCOUNT_USER is used by
> + * pre-existing drivers to maintain existing accounting against
> + * user->locked_mm rather than mm->pinned_mm.

I thought the guidance was the opposite of this, it is the newer
places in the kernel that are using VM_ACCOUNT_USER?

I haven't got to the rest of the patches yet, but isn't there also a
mm->pinned_vm vs mm->locked_vm variation in the current drivers as
well?

> +void vm_account_init_current(struct vm_account *vm_account)
> +{
> +	vm_account_init(vm_account, current, NULL, VM_ACCOUNT_TASK);
> +}
> +EXPORT_SYMBOL_GPL(vm_account_init_current);

This can probably just be a static inline

You might consider putting all this in some new vm_account.h - given
how rarely it is used? Compile times and all

Jason

  parent reply	other threads:[~2023-01-24 14:32 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-24  5:42 [RFC PATCH 00/19] mm: Introduce a cgroup to limit the amount of locked and pinned memory Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 01/19] mm: Introduce vm_account Alistair Popple
2023-01-24  6:29   ` Christoph Hellwig
2023-01-24 14:32   ` Jason Gunthorpe [this message]
2023-01-30 11:36     ` Alistair Popple
2023-01-31 14:00   ` David Hildenbrand
2023-01-24  5:42 ` [RFC PATCH 02/19] drivers/vhost: Convert to use vm_account Alistair Popple
2023-01-24  5:55   ` Michael S. Tsirkin
2023-01-30 10:43     ` Alistair Popple
2023-01-24 14:34   ` Jason Gunthorpe
2023-01-24  5:42 ` [RFC PATCH 03/19] drivers/vdpa: Convert vdpa to use the new vm_structure Alistair Popple
2023-01-24 14:35   ` Jason Gunthorpe
2023-01-24  5:42 ` [RFC PATCH 04/19] infiniband/umem: Convert to use vm_account Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 05/19] RMDA/siw: " Alistair Popple
2023-01-24 14:37   ` Jason Gunthorpe
2023-01-24 15:22     ` Bernard Metzler
2023-01-24 15:56     ` Bernard Metzler
2023-01-30 11:34       ` Alistair Popple
2023-01-30 13:27         ` Bernard Metzler
2023-01-24  5:42 ` [RFC PATCH 06/19] RDMA/usnic: convert " Alistair Popple
2023-01-24 14:41   ` Jason Gunthorpe
2023-01-30 11:10     ` Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 07/19] vfio/type1: Charge pinned pages to pinned_vm instead of locked_vm Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 08/19] vfio/spapr_tce: Convert accounting to pinned_vm Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 09/19] io_uring: convert to use vm_account Alistair Popple
2023-01-24 14:44   ` Jason Gunthorpe
2023-01-30 11:12     ` Alistair Popple
2023-01-30 13:21       ` Jason Gunthorpe
2023-01-24  5:42 ` [RFC PATCH 10/19] net: skb: Switch to using vm_account Alistair Popple
2023-01-24 14:51   ` Jason Gunthorpe
2023-01-30 11:17     ` Alistair Popple
2023-02-06  4:36       ` Alistair Popple
2023-02-06 13:14         ` Jason Gunthorpe
2023-01-24  5:42 ` [RFC PATCH 11/19] xdp: convert to use vm_account Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 12/19] kvm/book3s_64_vio: Convert account_locked_vm() to vm_account_pinned() Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 13/19] fpga: dfl: afu: convert to use vm_account Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 14/19] mm: Introduce a cgroup for pinned memory Alistair Popple
2023-01-27 21:44   ` Tejun Heo
2023-01-30 13:20     ` Jason Gunthorpe
2023-01-24  5:42 ` [RFC PATCH 15/19] mm/util: Extend vm_account to charge pages against the pin cgroup Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 16/19] mm/util: Refactor account_locked_vm Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 17/19] mm: Convert mmap and mlock to use account_locked_vm Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 18/19] mm/mmap: Charge locked memory to pins cgroup Alistair Popple
2023-01-24  5:42 ` [RFC PATCH 19/19] selftests/vm: Add pins-cgroup selftest for mlock/mmap Alistair Popple
2023-01-24 18:26 ` [RFC PATCH 00/19] mm: Introduce a cgroup to limit the amount of locked and pinned memory Yosry Ahmed
2023-01-31  0:54   ` Alistair Popple
2023-01-31  5:14     ` Yosry Ahmed
2023-01-31 11:22       ` Alistair Popple
2023-01-31 19:49         ` Yosry Ahmed
2023-01-24 20:12 ` Jason Gunthorpe
2023-01-31 13:57   ` David Hildenbrand
2023-01-31 14:03     ` Jason Gunthorpe
2023-01-31 14:06       ` David Hildenbrand
2023-01-31 14:10         ` Jason Gunthorpe
2023-01-31 14:15           ` David Hildenbrand
2023-01-31 14:21             ` Jason Gunthorpe

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