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video: tegra: nvmap: Account NvMap memory for OOM Decisions

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Account NvMap allocated memory into both RSS and CG tracking to make
efficient OOM kill decisions during memory pressure.

NvMap allocates memory via kernel APIs like alloc_pages, the kernel
memory is not accounted on behalf of process who requests the
allocation. Hence in case OOM, the OOM killer never kills the process
who has allocated memory via NvMap even though this process might be
holding most of the memory.

Solve this issue using following approach:
- Use __GFP_ACCOUNT and __GFP_NORETRY flag
-  __GFP_NORETRY will not let the current allocation flow to go into OOM
path, so that it will never trigger OOM.
- __GFP_ACCOUNT causes the allocation to be accounted to kmemcg. So any
allocation done by NvMap will be definitely accounted to kmemcg and
cgroups can be used to define memory limits.
- Add RSS counting for the process which allocates by NvMap, so that OOM
score for that process will get updated and OOM killer can pick this
process based upon the OOM score.
- Every process that has a reference to NvMap Handle would have the
memory size accounted into its RSS. On releasing the reference to
handle, the RSS would be reduced.

Bug 5222690

Change-Id: I3fa9b76ec9fc8d7f805111cb96e11e2ab1db42ce
Signed-off-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3427871
(cherry picked from commit 2ca91098aa)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3453101
Tested-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
Reviewed-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Ketan Patil
2025-08-11 17:32:18 +00:00
committed by Amulya Yarlagadda
parent efa698bed8
commit cfe6242c8c
4 changed files with 99 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/video/tegra/nvmap/nvmap_priv.h
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@@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2009-2023, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2009-2025, NVIDIA CORPORATION. All rights reserved.
*
* GPU memory management driver for Tegra
*/
@@ -93,7 +93,7 @@ do { \
} \
} while (0)
#define GFP_NVMAP (GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN)
#define GFP_NVMAP (GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN | __GFP_ACCOUNT | __GFP_NORETRY)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
@@ -271,6 +271,7 @@ struct nvmap_handle {
wait_queue_head_t waitq;
int numa_id;
u64 serial_id;
u64 anon_count;
};
struct nvmap_handle_info {
@@ -295,6 +296,8 @@ struct nvmap_handle_ref {
struct rb_node node;
atomic_t dupes; /* number of times to free on file close */
bool is_ro;
struct mm_struct *mm;
u64 anon_count;
};
#if defined(NVMAP_CONFIG_PAGE_POOLS)