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source | linux | ================
Shadow Variables
================
Shadow variables are a simple way for livepatch modules to associate
additional "shadow" data with existing data structures. Shadow data is
allocated separately from parent data structures, which are left
unmodified. The shadow variable API described in this documen... | Documentation/livepatch/shadow-vars.rst | null | null | null | null | null |
source | linux | ====================
System State Changes
====================
Some users are really reluctant to reboot a system. This brings the need
to provide more livepatches and maintain some compatibility between them.
Maintaining more livepatches is much easier with cumulative livepatches.
Each new livepatch completely repla... | Documentation/livepatch/system-state.rst | null | null | null | null | null |
source | linux | ================
Futex Requeue PI
================
Requeueing of tasks from a non-PI futex to a PI futex requires
special handling in order to ensure the underlying rt_mutex is never
left without an owner if it has waiters; doing so would break the PI
boosting logic [see rt-mutex-design.rst] For the purposes of
brevit... | Documentation/locking/futex-requeue-pi.rst | null | null | null | null | null |
source | linux | ===========================
Hardware Spinlock Framework
===========================
Introduction
============
Hardware spinlock modules provide hardware assistance for synchronization
and mutual exclusion between heterogeneous processors and those not operating
under a single, shared operating system.
For example, O... | Documentation/locking/hwspinlock.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=======
Locking
=======
.. toctree::
:maxdepth: 1
locktypes
lockdep-design
lockstat
locktorture
mutex-design
rt-mutex-design
rt-mutex
seqlock
spinlocks
ww-mutex-design
preempt-locking
pi-futex
futex-requeue-pi
hwspinlock
... | Documentation/locking/index.rst | null | null | null | null | null |
source | linux | Runtime locking correctness validator
=====================================
started by Ingo Molnar <mingo@redhat.com>
additions by Arjan van de Ven <arjan@linux.intel.com>
Lock-class
----------
The basic object the validator operates upon is a 'class' of locks.
A class of locks is a group of locks that are logical... | Documentation/locking/lockdep-design.rst | null | null | null | null | null |
source | linux | ===============
Lock Statistics
===============
What
====
As the name suggests, it provides statistics on locks.
Why
===
Because things like lock contention can severely impact performance.
How
===
Lockdep already has hooks in the lock functions and maps lock instances to
lock classes. We build on that (see Docu... | Documentation/locking/lockstat.rst | null | null | null | null | null |
source | linux | ==================================
Kernel Lock Torture Test Operation
==================================
CONFIG_LOCK_TORTURE_TEST
========================
The CONFIG_LOCK_TORTURE_TEST config option provides a kernel module
that runs torture tests on core kernel locking primitives. The kernel
module, 'locktorture', ma... | Documentation/locking/locktorture.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _kernel_hacking_locktypes:
==========================
Lock types and their rules
==========================
Introduction
============
The kernel provides a variety of locking primitives which can be divided
into three categories:
- Sleeping locks
- CPU local locks
- Spinni... | Documentation/locking/locktypes.rst | null | null | null | null | null |
source | linux | =======================
Generic Mutex Subsystem
=======================
started by Ingo Molnar <mingo@redhat.com>
updated by Davidlohr Bueso <davidlohr@hp.com>
What are mutexes?
-----------------
In the Linux kernel, mutexes refer to a particular locking primitive
that enforces serialization on shared memory system... | Documentation/locking/mutex-design.rst | null | null | null | null | null |
source | linux | ====================
Percpu rw semaphores
====================
Percpu rw semaphores is a new read-write semaphore design that is
optimized for locking for reading.
The problem with traditional read-write semaphores is that when multiple
cores take the lock for reading, the cache line containing the semaphore
is bounc... | Documentation/locking/percpu-rw-semaphore.rst | null | null | null | null | null |
source | linux | ======================
Lightweight PI-futexes
======================
We are calling them lightweight for 3 reasons:
- in the user-space fastpath a PI-enabled futex involves no kernel work
(or any other PI complexity) at all. No registration, no extra kernel
calls - just pure fast atomic ops in userspace.
- e... | Documentation/locking/pi-futex.rst | null | null | null | null | null |
source | linux | ===========================================================================
Proper Locking Under a Preemptible Kernel: Keeping Kernel Code Preempt-Safe
===========================================================================
:Author: Robert Love <rml@tech9.net>
Introduction
============
A preemptible kernel cre... | Documentation/locking/preempt-locking.rst | null | null | null | null | null |
source | linux | ====================
The robust futex ABI
====================
:Author: Started by Paul Jackson <pj@sgi.com>
Robust_futexes provide a mechanism that is used in addition to normal
futexes, for kernel assist of cleanup of held locks on task exit.
The interesting data as to what futexes a thread is holding is kept on ... | Documentation/locking/robust-futex-ABI.rst | null | null | null | null | null |
source | linux | ========================================
A description of what robust futexes are
========================================
:Started by: Ingo Molnar <mingo@redhat.com>
Background
----------
what are robust futexes? To answer that, we first need to understand
what futexes are: normal futexes are special types of locks... | Documentation/locking/robust-futexes.rst | null | null | null | null | null |
source | linux | ==============================
RT-mutex implementation design
==============================
Copyright (c) 2006 Steven Rostedt
Licensed under the GNU Free Documentation License, Version 1.2
This document tries to describe the design of the rtmutex.c implementation.
It doesn't describe the reasons why rtmutex.c exis... | Documentation/locking/rt-mutex-design.rst | null | null | null | null | null |
source | linux | ==================================
RT-mutex subsystem with PI support
==================================
RT-mutexes with priority inheritance are used to support PI-futexes,
which enable pthread_mutex_t priority inheritance attributes
(PTHREAD_PRIO_INHERIT). [See Documentation/locking/pi-futex.rst for more details
abo... | Documentation/locking/rt-mutex.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
======================================
Sequence counters and sequential locks
======================================
Introduction
============
Sequence counters are a reader-writer consistency mechanism with
lockless readers (read-only retry loops), and no writer starvation. They
... | Documentation/locking/seqlock.rst | null | null | null | null | null |
source | linux | ===============
Locking lessons
===============
Lesson 1: Spin locks
====================
The most basic primitive for locking is spinlock::
static DEFINE_SPINLOCK(xxx_lock);
unsigned long flags;
spin_lock_irqsave(&xxx_lock, flags);
... critical section here ..
spin_unlock_irqrestore(&xxx_lock, flags);
The ... | Documentation/locking/spinlocks.rst | null | null | null | null | null |
source | linux | ======================================
Wound/Wait Deadlock-Proof Mutex Design
======================================
Please read mutex-design.rst first, as it applies to wait/wound mutexes too.
Motivation for WW-Mutexes
-------------------------
GPU's do operations that commonly involve many buffers. Those buffers
... | Documentation/locking/ww-mutex-design.rst | null | null | null | null | null |
source | linux | Configuring Git
===============
This chapter describes maintainer level git configuration.
Tagged branches used in pull requests (see
Documentation/maintainer/pull-requests.rst) should be signed with the
developers public GPG key. Signed tags can be created by passing
``-u <key-id>`` to ``git tag``. However, since yo... | Documentation/maintainer/configure-git.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
==============================
Feature and driver maintainers
==============================
The term "maintainer" spans a very wide range of levels of engagement
from people handling patches and pull requests as almost a full time job
to people responsible for a small feature or a... | Documentation/maintainer/feature-and-driver-maintainers.rst | null | null | null | null | null |
source | linux | ==========================
Kernel Maintainer Handbook
==========================
This document is the humble beginning of a manual for kernel maintainers.
There is a lot yet to go here! Please feel free to propose (and write)
additions to this manual.
.. toctree::
:maxdepth: 2
feature-and-driver-maintainers
... | Documentation/maintainer/index.rst | null | null | null | null | null |
source | linux | .. _maintainerentryprofile:
Maintainer Entry Profile
========================
The Maintainer Entry Profile supplements the top-level process documents
(submitting-patches, submitting drivers...) with
subsystem/device-driver-local customs as well as details about the patch
submission life-cycle. A contributor uses thi... | Documentation/maintainer/maintainer-entry-profile.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=====================================
Handling messy pull-request diffstats
=====================================
Subsystem maintainers routinely use ``git request-pull`` as part of the
process of sending work upstream. Normally, the result includes a nice
diffstat that shows whic... | Documentation/maintainer/messy-diffstat.rst | null | null | null | null | null |
source | linux | .. _modifyingpatches:
Modifying Patches
=================
If you are a subsystem or branch maintainer, sometimes you need to slightly
modify patches you receive in order to merge them, because the code is not
exactly the same in your tree and the submitters'. If you stick strictly to
rule (c) of the developers certif... | Documentation/maintainer/modifying-patches.rst | null | null | null | null | null |
source | linux | Creating Pull Requests
======================
This chapter describes how maintainers can create and submit pull requests
to other maintainers. This is useful for transferring changes from one
maintainers tree to another maintainers tree.
This document was written by Tobin C. Harding (who at that time, was not an
expe... | Documentation/maintainer/pull-requests.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
====================
Rebasing and merging
====================
Maintaining a subsystem, as a general rule, requires a familiarity with the
Git source-code management system. Git is a powerful tool with a lot of
features; as is often the case with such tools, there are right and wr... | Documentation/maintainer/rebasing-and-merging.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
==========================
MHI (Modem Host Interface)
==========================
This document provides information about the MHI protocol.
Overview
========
MHI is a protocol developed by Qualcomm Innovation Center, Inc. It is used
by the host processors to control and communica... | Documentation/mhi/mhi.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
============
MHI Topology
============
This document provides information about the MHI topology modeling and
representation in the kernel.
MHI Controller
--------------
MHI controller driver manages the interaction with the MHI client devices
such as the external modems and WiFi... | Documentation/mhi/topology.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=============================
AD525x Digital Potentiometers
=============================
The ad525x_dpot driver exports a simple sysfs interface. This allows you to
work with the immediate resistance settings as well as update the saved startup
settings. Access to the factory pr... | Documentation/misc-devices/ad525x_dpot.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=======================
AMD SIDE BAND interface
=======================
Some AMD Zen based processors supports system management
functionality via side-band interface (SBI) called
Advanced Platform Management Link (APML). APML is an I2C/I3C
based 2-wire processor target interface. ... | Documentation/misc-devices/amd-sbi.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
======================
Kernel driver apds990x
======================
Supported chips:
Avago APDS990X
Data sheet:
Not freely available
Author:
Samu Onkalo <samu.p.onkalo@nokia.com>
Description
-----------
APDS990x is a combined ambient light and proximity sensor. ALS and proximi... | Documentation/misc-devices/apds990x.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=======================
Kernel driver bh1770glc
=======================
Supported chips:
- ROHM BH1770GLC
- OSRAM SFH7770
Data sheet:
Not freely available
Author:
Samu Onkalo <samu.p.onkalo@nokia.com>
Description
-----------
BH1770GLC and SFH7770 are combined ambient light and ... | Documentation/misc-devices/bh1770glc.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. include:: <isonum.txt>
===============
C2 port support
===============
(C) Copyright 2007 Rodolfo Giometti <giometti@enneenne.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free ... | Documentation/misc-devices/c2port.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===========================================================================
Driver for Synopsys DesignWare PCIe traffic generator (also known as xData)
===========================================================================
Supported chips:
Synopsys DesignWare PCIe prototype so... | Documentation/misc-devices/dw-xdata-pcie.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0+
======================================================
IBM Virtual Management Channel Kernel Driver (IBMVMC)
======================================================
:Authors:
Dave Engebretsen <engebret@us.ibm.com>,
Adam Reznechek <adreznec@linux.vnet.ibm.com>,
Steven Royer <sero... | Documentation/misc-devices/ibmvmc.rst | null | null | null | null | null |
source | linux | ========================
Kernel driver ics932s401
========================
Supported chips:
* IDT ICS932S401
Prefix: 'ics932s401'
Addresses scanned: I2C 0x69
Datasheet: Publicly available at the IDT website
Author: Darrick J. Wong
Description
-----------
This driver implements support for the IDT ... | Documentation/misc-devices/ics932s401.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
============================================
Assorted Miscellaneous Devices Documentation
============================================
This documentation contains information for assorted devices that do not
fit into other categories.
.. toctree::
:caption: Table of contents
... | Documentation/misc-devices/index.rst | null | null | null | null | null |
source | linux | ======================
Kernel driver isl29003
======================
Supported chips:
* Intersil ISL29003
Prefix: 'isl29003'
Addresses scanned: none
Datasheet:
http://www.intersil.com/data/fn/fn7464.pdf
Author: Daniel Mack <daniel@caiaq.de>
Description
-----------
The ISL29003 is an integrated light sensor with... | Documentation/misc-devices/isl29003.rst | null | null | null | null | null |
source | linux | =======================
Kernel driver lis3lv02d
=======================
Supported chips:
* STMicroelectronics LIS3LV02DL, LIS3LV02DQ (12 bits precision)
* STMicroelectronics LIS302DL, LIS3L02DQ, LIS331DL (8 bits) and
LIS331DLH (16 bits)
Authors:
- Yan Burman <burman.yan@gmail.com>
- Eric Piel <eric.... | Documentation/misc-devices/lis3lv02d.rst | null | null | null | null | null |
source | linux | =====================
Kernel driver max6875
=====================
Supported chips:
* Maxim MAX6874, MAX6875
Prefix: 'max6875'
Addresses scanned: None (see below)
Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdf
Author: Ben Gardner <bgardner@wabtec.com>
Description
-----------
The ... | Documentation/misc-devices/max6875.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===============================================
Marvell CN10K DMA packet interface (DPI) driver
===============================================
Overview
========
DPI is a DMA packet interface hardware block in Marvell's CN10K silicon.
DPI hardware comprises a physical function (PF... | Documentation/misc-devices/mrvl_cn10k_dpi.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
====================================================================
Notes on Oxford Semiconductor PCIe (Tornado) 950 serial port devices
====================================================================
Oxford Semiconductor PCIe (Tornado) 950 serial port devices are driven
by a... | Documentation/misc-devices/oxsemi-tornado.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=====================================
Driver for PCI Endpoint Test Function
=====================================
This driver should be used as a host side driver if the root complex is
connected to a configurable PCI endpoint running ``pci_epf_test`` function
driver configured acc... | Documentation/misc-devices/pci-endpoint-test.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
========================
Spear PCIe Gadget Driver
========================
Author
======
Pratyush Anand (pratyush.anand@gmail.com)
Location
========
driver/misc/spear13xx_pcie_gadget.c
Supported Chip:
===============
SPEAr1300
SPEAr1310
Menuconfig option:
==================
Devi... | Documentation/misc-devices/spear-pcie-gadget.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=====================================
Texas Instruments TPS6594 PFSM driver
=====================================
Author: Julien Panis (jpanis@baylibre.com)
Overview
========
Strictly speaking, PFSM (Pre-configurable Finite State Machine) is not
hardware. It is a piece of code.
... | Documentation/misc-devices/tps6594-pfsm.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
Uacce (Unified/User-space-access-intended Accelerator Framework)
================================================================
Introduction
------------
Uacce (Unified/User-space-access-intended Accelerator Framework) targets to
provide Shared Virtual Addressing (SVA) between a... | Documentation/misc-devices/uacce.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0+
====================
Xilinx SD-FEC Driver
====================
Overview
========
This driver supports SD-FEC Integrated Block for Zynq |Ultrascale+ (TM)| RFSoCs.
.. |Ultrascale+ (TM)| unicode:: Ultrascale+ U+2122
.. with trademark sign
For a full description of SD-FEC core f... | Documentation/misc-devices/xilinx_sdfec.rst | null | null | null | null | null |
source | linux | =========
Active MM
=========
Note, the mm_count refcount may no longer include the "lazy" users
(running tasks with ->active_mm == mm && ->mm == NULL) on kernels
with CONFIG_MMU_LAZY_TLB_REFCOUNT=n. Taking and releasing these lazy
references must be done with mmgrab_lazy_tlb() and mmdrop_lazy_tlb()
helpers, which abs... | Documentation/mm/active_mm.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===========================
MEMORY ALLOCATION PROFILING
===========================
Low overhead (suitable for production) accounting of all memory allocations,
tracked by file and line number.
Usage:
kconfig options:
- CONFIG_MEM_ALLOC_PROFILING
- CONFIG_MEM_ALLOC_PROFILING_ENAB... | Documentation/mm/allocation-profiling.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===============================
Architecture Page Table Helpers
===============================
Generic MM expects architectures (with MMU) to provide helpers to create, access
and modify page table entries at various level for different memory functions.
These page table helpers n... | Documentation/mm/arch_pgtable_helpers.rst | null | null | null | null | null |
source | linux | ================
Memory Balancing
================
Started Jan 2000 by Kanoj Sarcar <kanoj@sgi.com>
Memory balancing is needed for !__GFP_HIGH and !__GFP_KSWAPD_RECLAIM as
well as for non __GFP_IO allocations.
The first reason why a caller may avoid reclaim is that the caller can not
sleep due to holding a spinlock ... | Documentation/mm/balance.rst | null | null | null | null | null |
source | linux | =====================
Free Page Reporting
=====================
Free page reporting is an API by which a device can register to receive
lists of pages that are currently unused by the system. This is useful in
the case of virtualization where a guest is then able to use this data to
notify the hypervisor that it is no... | Documentation/mm/free_page_reporting.rst | null | null | null | null | null |
source | linux | ====================
High Memory Handling
====================
By: Peter Zijlstra <a.p.zijlstra@chello.nl>
.. contents:: :local:
What Is High Memory?
====================
High memory (highmem) is used when the size of physical memory approaches or
exceeds the maximum size of virtual memory. At that point it become... | Documentation/mm/highmem.rst | null | null | null | null | null |
source | linux | =====================================
Heterogeneous Memory Management (HMM)
=====================================
Provide infrastructure and helpers to integrate non-conventional memory (device
memory like GPU on board memory) into regular kernel path, with the cornerstone
of this being specialized struct page for suc... | Documentation/mm/hmm.rst | null | null | null | null | null |
source | linux | =====================
Hugetlbfs Reservation
=====================
Overview
========
Huge pages as described at Documentation/admin-guide/mm/hugetlbpage.rst are
typically preallocated for application use. These huge pages are instantiated
in a task's address space at page fault time if the VMA indicates huge pages
ar... | Documentation/mm/hugetlbfs_reserv.rst | null | null | null | null | null |
source | linux | ========
hwpoison
========
What is hwpoison?
=================
Upcoming Intel CPUs have support for recovering from some memory errors
(``MCA recovery``). This requires the OS to declare a page "poisoned",
kill the processes associated with it and avoid using it in the future.
This patchkit implements the necessary ... | Documentation/mm/hwpoison.rst | null | null | null | null | null |
source | linux | ===============================
Memory Management Documentation
===============================
This is a guide to understanding the memory management subsystem
of Linux. If you are looking for advice on simply allocating memory,
see the :ref:`memory_allocation`. For controlling and tuning guides,
see the :doc:`admi... | Documentation/mm/index.rst | null | null | null | null | null |
source | linux | =======================
Kernel Samepage Merging
=======================
KSM is a memory-saving de-duplication feature, enabled by CONFIG_KSM=y,
added to the Linux kernel in 2.6.32. See ``mm/ksm.c`` for its implementation,
and http://lwn.net/Articles/306704/ and https://lwn.net/Articles/330589/
The userspace interfac... | Documentation/mm/ksm.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0-or-later
==========================
Memfd Preservation via LUO
==========================
.. kernel-doc:: mm/memfd_luo.c
:doc: Memfd Preservation via LUO
Memfd Preservation ABI
======================
.. kernel-doc:: include/linux/kho/abi/memfd.h
:doc: DOC: memfd Live Update... | Documentation/mm/memfd_preservation.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=====================
Physical Memory Model
=====================
Physical memory in a system may be addressed in different ways. The
simplest case is when the physical memory starts at address 0 and
spans a contiguous range up to the maximal address. It could be,
however, that thi... | Documentation/mm/memory-model.rst | null | null | null | null | null |
source | linux | When do you need to notify inside page table lock ?
===================================================
When clearing a pte/pmd we are given a choice to notify the event through
(notify version of \*_clear_flush call mmu_notifier_invalidate_range) under
the page table lock. But that notification is not necessary in al... | Documentation/mm/mmu_notifier.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=============
Multi-Gen LRU
=============
The multi-gen LRU is an alternative LRU implementation that optimizes
page reclaim and improves performance under memory pressure. Page
reclaim decides the kernel's caching policy and ability to overcommit
memory. It directly impacts the ksw... | Documentation/mm/multigen_lru.rst | null | null | null | null | null |
source | linux | Started Nov 1999 by Kanoj Sarcar <kanoj@sgi.com>
=============
What is NUMA?
=============
This question can be answered from a couple of perspectives: the
hardware view and the Linux software view.
From the hardware perspective, a NUMA system is a computer platform that
comprises multiple components or assemblies ... | Documentation/mm/numa.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
======================
Out Of Memory Handling
====================== | Documentation/mm/oom.rst | null | null | null | null | null |
source | linux | =====================
Overcommit Accounting
=====================
The Linux kernel supports the following overcommit handling modes
0
Heuristic overcommit handling. Obvious overcommits of address
space are refused. Used for a typical system. It ensures a
seriously wild allocation fails while allowing overcommit to... | Documentation/mm/overcommit-accounting.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
==========
Page Cache
==========
The page cache is the primary way that the user and the rest of the kernel
interact with filesystems. It can be bypassed (e.g. with O_DIRECT),
but normal reads, writes and mmaps go through the page cache.
Folios
======
The folio is the unit of me... | Documentation/mm/page_cache.rst | null | null | null | null | null |
source | linux | ==============
Page fragments
==============
A page fragment is an arbitrary-length arbitrary-offset area of memory
which resides within a 0 or higher order compound page. Multiple
fragments within that page are individually refcounted, in the page's
reference counter.
The page_frag functions, page_frag_alloc and pa... | Documentation/mm/page_frags.rst | null | null | null | null | null |
source | linux | ==============
Page migration
==============
Page migration allows moving the physical location of pages between
nodes in a NUMA system while the process is running. This means that the
virtual addresses that the process sees do not change. However, the
system rearranges the physical location of those pages.
Also see... | Documentation/mm/page_migration.rst | null | null | null | null | null |
source | linux | ==================================================
page owner: Tracking about who allocated each page
==================================================
Introduction
============
page owner is for the tracking about who allocated each page.
It can be used to debug memory leak or to find a memory hogger.
When allocati... | Documentation/mm/page_owner.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
================
Page Table Check
================
Introduction
============
Page table check allows to harden the kernel by ensuring that some types of
the memory corruptions are prevented.
Page table check performs extra verifications at the time when new pages become
accessibl... | Documentation/mm/page_table_check.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===========
Page Tables
===========
Paged virtual memory was invented along with virtual memory as a concept in
1962 on the Ferranti Atlas Computer which was the first computer with paged
virtual memory. The feature migrated to newer computers and became a de facto
feature of all U... | Documentation/mm/page_tables.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===============
Physical Memory
===============
Linux is available for a wide range of architectures so there is a need for an
architecture-independent abstraction to represent the physical memory. This
chapter describes the structures used to manage physical memory in a running
sy... | Documentation/mm/physical_memory.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=================
Process Addresses
=================
.. toctree::
:maxdepth: 3
Userland memory ranges are tracked by the kernel via Virtual Memory Areas or
'VMA's of type :c:struct:`!struct vm_area_struct`.
Each VMA describes a virtually contiguous memory range with identica... | Documentation/mm/process_addrs.rst | null | null | null | null | null |
source | linux | ==============================
remap_file_pages() system call
==============================
The remap_file_pages() system call is used to create a nonlinear mapping,
that is, a mapping in which the pages of the file are mapped into a
nonsequential order in memory. The advantage of using remap_file_pages()
over using ... | Documentation/mm/remap_file_pages.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
========================
Shared Memory Filesystem
======================== | Documentation/mm/shmfs.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===============
Slab Allocation
===============
Functions and structures
========================
.. kernel-doc:: mm/slab.h
.. kernel-doc:: mm/slub.c
:internal: | Documentation/mm/slab.rst | null | null | null | null | null |
source | linux | =====================
Split page table lock
=====================
Originally, mm->page_table_lock spinlock protected all page tables of the
mm_struct. But this approach leads to poor page fault scalability of
multi-threaded applications due to high contention on the lock. To improve
scalability, split page table lock ... | Documentation/mm/split_page_table_lock.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
:Author: Chris Li <chrisl@kernel.org>, Kairui Song <kasong@tencent.com>
==========
Swap Table
==========
Swap table implements swap cache as a per-cluster swap cache value array.
Swap Entry
----------
A swap entry contains the information required to serve the anonymous page
fau... | Documentation/mm/swap-table.rst | null | null | null | null | null |
source | linux | ============================
Transparent Hugepage Support
============================
This document describes design principles for Transparent Hugepage (THP)
support and its interaction with other parts of the memory management
system.
Design principles
=================
- "graceful fallback": mm components which ... | Documentation/mm/transhuge.rst | null | null | null | null | null |
source | linux | ==============================
Unevictable LRU Infrastructure
==============================
.. contents:: :local:
Introduction
============
This document describes the Linux memory manager's "Unevictable LRU"
infrastructure and the use of this to manage several types of "unevictable"
folios.
The document attempts... | Documentation/mm/unevictable-lru.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
======================================
Virtually Contiguous Memory Allocation
====================================== | Documentation/mm/vmalloc.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=====================================
Virtually Mapped Kernel Stack Support
=====================================
:Author: Shuah Khan <skhan@linuxfoundation.org>
.. contents:: :local:
Overview
--------
This is a compilation of information from the code and original patch
series ... | Documentation/mm/vmalloced-kernel-stacks.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=========================================
A vmemmap diet for HugeTLB and Device DAX
=========================================
HugeTLB
=======
This section is to explain how HugeTLB Vmemmap Optimization (HVO) works.
The ``struct page`` structures are used to describe a physical pa... | Documentation/mm/vmemmap_dedup.rst | null | null | null | null | null |
source | linux | ========
zsmalloc
========
This allocator is designed for use with zram. Thus, the allocator is
supposed to work well under low memory conditions. In particular, it
never attempts higher order page allocation which is very likely to
fail under memory pressure. On the other hand, if we just use single
(0-order) pages, ... | Documentation/mm/zsmalloc.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=============
API Reference
=============
Kernel space programs can use every feature of DAMON using below APIs. All you
need to do is including ``damon.h``, which is located in ``include/linux/`` of
the source tree.
Structures
==========
.. kernel-doc:: include/linux/damon.h
... | Documentation/mm/damon/api.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
======
Design
======
.. _damon_design_execution_model_and_data_structures:
Execution Model and Data Structures
===================================
The monitoring-related information including the monitoring request
specification and DAMON-based operation schemes are stored in a ... | Documentation/mm/damon/design.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
==========================
Frequently Asked Questions
==========================
Does DAMON support virtual memory only?
=======================================
No. The core of the DAMON is address space independent. The address space
specific monitoring operations including mon... | Documentation/mm/damon/faq.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
================================================================
DAMON: Data Access MONitoring and Access-aware System Operations
================================================================
DAMON is a Linux kernel subsystem for efficient :ref:`data access monitoring
<damon_des... | Documentation/mm/damon/index.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
DAMON Maintainer Entry Profile
==============================
The DAMON subsystem covers the files that are listed in 'DAMON' section of
'MAINTAINERS' file.
The mailing lists for the subsystem are damon@lists.linux.dev and
linux-mm@kvack.org. Patches should be made against the `m... | Documentation/mm/damon/maintainer-profile.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=================================================
DAMON Moniting Interval Parameters Tuning Example
=================================================
DAMON's monitoring parameters need tuning based on given workload and the
monitoring purpose. There is a :ref:`tuning guide
<damon_... | Documentation/mm/damon/monitoring_intervals_tuning_example.rst | null | null | null | null | null |
source | linux | ===================================
NetLabel CIPSO/IPv4 Protocol Engine
===================================
Paul Moore, paul.moore@hp.com
May 17, 2006
Overview
========
The NetLabel CIPSO/IPv4 protocol engine is based on the IETF Commercial
IP Security Option (CIPSO) draft from July 16, 1992. A copy of this
draft ... | Documentation/netlabel/cipso_ipv4.rst | null | null | null | null | null |
source | linux | IETF CIPSO Working Group
16 July, 1992
COMMERCIAL IP SECURITY OPTION (CIPSO 2.2)
1. Status
This Internet Draft provides the high level specification for a Commercial
IP Security Option (CIPSO). This draft reflects the version as approved by
the CIPSO IETF Working Group. Distribution of this... | Documentation/netlabel/draft-ietf-cipso-ipsecurity-01.txt | null | null | null | null | null |
source | linux | Draft IETF CIPSO IP Security
----------------------------
.. include:: draft-ietf-cipso-ipsecurity-01.txt
:literal: | Documentation/netlabel/draft_ietf.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
========
NetLabel
========
.. toctree::
:maxdepth: 1
introduction
cipso_ipv4
lsm_interface
draft_ietf | Documentation/netlabel/index.rst | null | null | null | null | null |
source | linux | =====================
NetLabel Introduction
=====================
Paul Moore, paul.moore@hp.com
August 2, 2006
Overview
========
NetLabel is a mechanism which can be used by kernel security modules to attach
security attributes to outgoing network packets generated from user space
applications and read security att... | Documentation/netlabel/introduction.rst | null | null | null | null | null |
source | linux | ========================================
NetLabel Linux Security Module Interface
========================================
Paul Moore, paul.moore@hp.com
May 17, 2006
Overview
========
NetLabel is a mechanism which can set and retrieve security attributes from
network packets. It is intended to be used by LSM devel... | Documentation/netlabel/lsm_interface.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _specs:
=============================
Netlink Family Specifications
=============================
.. toctree::
:maxdepth: 1
:glob:
* | Documentation/netlink/specs/index.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
==============================================
Netdev private dataroom for 6lowpan interfaces
==============================================
All 6lowpan able net devices, means all interfaces with ARPHRD_6LOWPAN,
must have "struct lowpan_priv" placed at beginning of netdev_priv.
T... | Documentation/networking/6lowpan.rst | null | null | null | null | null |
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