From: Alistair Popple <apopple@nvidia.com>
To: linux-mm@kvack.org, cgroups@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, jgg@nvidia.com,
jhubbard@nvidia.com, tjmercier@google.com, hannes@cmpxchg.org,
surenb@google.com, mkoutny@suse.com, daniel@ffwll.ch,
Alistair Popple <apopple@nvidia.com>
Subject: [RFC PATCH 15/19] mm/util: Extend vm_account to charge pages against the pin cgroup
Date: Tue, 24 Jan 2023 16:42:44 +1100 [thread overview]
Message-ID: <76d61af0219560c03910a189f1ffa340d108858e.1674538665.git-series.apopple@nvidia.com> (raw)
In-Reply-To: <cover.f52b9eb2792bccb8a9ecd6bc95055705cfe2ae03.1674538665.git-series.apopple@nvidia.com>
The vm_account_pinned() functions currently only account pages against
pinned_vm/locked_vm and enforce limits against RLIMIT_MEMLOCK. Extend
these to account pages and enforce limits using the pin count cgroup.
Accounting of pages will fail if either RLIMIT_MEMLOCK or the cgroup
limit is exceeded. Unlike rlimit enforcement which can be bypassed if
the user has CAP_IPC_LOCK cgroup limits can not be bypassed.
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
---
include/linux/mm_types.h | 1 +
mm/util.c | 22 ++++++++++++++++++----
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 7de2168..4adf8dc 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -1116,6 +1116,7 @@ struct vm_account {
struct mm_struct *mm;
struct user_struct *user;
} a;
+ struct pins_cgroup *pins_cg;
enum vm_account_flags flags;
};
diff --git a/mm/util.c b/mm/util.c
index af40b1e..e5fb01a 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -442,6 +442,7 @@ void vm_account_init(struct vm_account *vm_account, struct task_struct *task,
vm_account->a.mm = task->mm;
}
+ vm_account->pins_cg = get_pins_cg(task);
vm_account->flags = flags;
}
EXPORT_SYMBOL_GPL(vm_account_init);
@@ -459,6 +460,7 @@ void vm_account_release(struct vm_account *vm_account)
free_uid(vm_account->a.user);
else
mmdrop(vm_account->a.mm);
+ put_pins_cg(vm_account->pins_cg);
}
EXPORT_SYMBOL_GPL(vm_account_release);
@@ -489,6 +491,15 @@ static int vm_account_cmpxchg(struct vm_account *vm_account,
}
}
+static void vm_unaccount_legacy(struct vm_account *vm_account,
+ unsigned long npages)
+{
+ if (vm_account->flags & VM_ACCOUNT_USER)
+ atomic_long_sub(npages, &vm_account->a.user->locked_vm);
+ else
+ atomic64_sub(npages, &vm_account->a.mm->pinned_vm);
+}
+
int vm_account_pinned(struct vm_account *vm_account, unsigned long npages)
{
unsigned long lock_limit = RLIM_INFINITY;
@@ -506,16 +517,19 @@ int vm_account_pinned(struct vm_account *vm_account, unsigned long npages)
return ret;
}
+ if (pins_try_charge(vm_account->pins_cg, npages)) {
+ vm_unaccount_legacy(vm_account, npages);
+ return -ENOMEM;
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(vm_account_pinned);
void vm_unaccount_pinned(struct vm_account *vm_account, unsigned long npages)
{
- if (vm_account->flags & VM_ACCOUNT_USER)
- atomic_long_sub(npages, &vm_account->a.user->locked_vm);
- else
- atomic64_sub(npages, &vm_account->a.mm->pinned_vm);
+ vm_unaccount_legacy(vm_account, npages);
+ pins_uncharge(vm_account->pins_cg, npages);
}
EXPORT_SYMBOL_GPL(vm_unaccount_pinned);
--
git-series 0.9.1
next prev parent reply other threads:[~2023-01-24 5:50 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
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 ` Alistair Popple [this message]
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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