mirror of
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This code is based on the RDMA and misc cgroup initially, but now uses page_counter. It uses the same min/low/max semantics as the memory cgroup as a result. There's a small mismatch as TTM uses u64, and page_counter long pages. In practice it's not a problem. 32-bits systems don't really come with >=4GB cards and as long as we're consistently wrong with units, it's fine. The device page size may not be in the same units as kernel page size, and each region might also have a different page size (VRAM vs GART for example). The interface is simple: - Call dmem_cgroup_register_region() - Use dmem_cgroup_try_charge to check if you can allocate a chunk of memory, use dmem_cgroup__uncharge when freeing it. This may return an error code, or -EAGAIN when the cgroup limit is reached. In that case a reference to the limiting pool is returned. - The limiting cs can be used as compare function for dmem_cgroup_state_evict_valuable. - After having evicted enough, drop reference to limiting cs with dmem_cgroup_pool_state_put. This API allows you to limit device resources with cgroups. You can see the supported cards in /sys/fs/cgroup/dmem.capacity You need to echo +dmem to cgroup.subtree_control, and then you can partition device memory. Co-developed-by: Friedrich Vock <friedrich.vock@gmx.de> Signed-off-by: Friedrich Vock <friedrich.vock@gmx.de> Co-developed-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Maarten Lankhorst <dev@lankhorst.se> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20241204143112.1250983-1-dev@lankhorst.se Signed-off-by: Maxime Ripard <mripard@kernel.org>
145 lines
2.4 KiB
ReStructuredText
145 lines
2.4 KiB
ReStructuredText
======================
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Core API Documentation
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======================
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This is the beginning of a manual for core kernel APIs. The conversion
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(and writing!) of documents for this manual is much appreciated!
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Core utilities
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==============
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This section has general and "core core" documentation. The first is a
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massive grab-bag of kerneldoc info left over from the docbook days; it
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should really be broken up someday when somebody finds the energy to do
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it.
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.. toctree::
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:maxdepth: 1
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kernel-api
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workqueue
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watch_queue
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printk-basics
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printk-formats
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printk-index
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symbol-namespaces
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asm-annotations
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Data structures and low-level utilities
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=======================================
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Library functionality that is used throughout the kernel.
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.. toctree::
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:maxdepth: 1
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kobject
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kref
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cleanup
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assoc_array
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folio_queue
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xarray
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maple_tree
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idr
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circular-buffers
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rbtree
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generic-radix-tree
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packing
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this_cpu_ops
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timekeeping
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errseq
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wrappers/atomic_t
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wrappers/atomic_bitops
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floating-point
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union_find
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min_heap
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Low level entry and exit
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========================
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.. toctree::
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:maxdepth: 1
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entry
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Concurrency primitives
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======================
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How Linux keeps everything from happening at the same time. See
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Documentation/locking/index.rst for more related documentation.
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.. toctree::
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:maxdepth: 1
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refcount-vs-atomic
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irq/index
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local_ops
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padata
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../RCU/index
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wrappers/memory-barriers.rst
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Low-level hardware management
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=============================
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Cache management, managing CPU hotplug, etc.
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.. toctree::
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:maxdepth: 1
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cachetlb
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cpu_hotplug
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memory-hotplug
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genericirq
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protection-keys
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Memory management
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=================
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How to allocate and use memory in the kernel. Note that there is a lot
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more memory-management documentation in Documentation/mm/index.rst.
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.. toctree::
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:maxdepth: 1
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memory-allocation
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unaligned-memory-access
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dma-api
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dma-api-howto
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dma-attributes
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dma-isa-lpc
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swiotlb
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mm-api
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cgroup
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genalloc
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pin_user_pages
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boot-time-mm
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gfp_mask-from-fs-io
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Interfaces for kernel debugging
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===============================
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.. toctree::
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:maxdepth: 1
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debug-objects
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tracepoint
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debugging-via-ohci1394
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Everything else
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===============
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Documents that don't fit elsewhere or which have yet to be categorized.
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.. toctree::
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:maxdepth: 1
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librs
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netlink
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.. only:: subproject and html
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Indices
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=======
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* :ref:`genindex`
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